Electronic Telegram No. 3699

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge,MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html

SUPERNOVA 2013gc IN ESO 430-20 = PSN J08071188-2803263.
R. Antezana, M. Hamuy, L. Gonzalez, R. Cartier, F. Forster, and F. Carrasco, Universidad de Chile; G. Pignata, Y. Apostolovski, E. Paillas, S. Varela, F. Bufano, F. Olivares, and K. Takats, Universidad Andres Bello; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B. Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent Supernova (mag approximately 16.7) on an unfiltered image taken on Nov. 7.34 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object is located at R.A. = 8h07m11s.88 +/- 0".2, Decl. = -28o03'26".3 +/- 0".2 (equinox 2000.0), which is about 43".3 east and 18".0 south of the center of the galaxy in ESO 430-20 (which also hosted SN 2013ak; cf. CBET 3437). The variable is also present in an image taken on Nov. 8.25 at mag approximately 16.7, but nothing is visible at this position on archival images taken on June 17.05 (limiting mag 20.2). The variable was designated PSN J08071188-2803263 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013gc based on the spectroscopic confirmation reported below.

N. Morrell, Las Campanas Observatory; and G. Pignata, Universidad Andres Bello, on behalf of the Carnegie Supernova Project and the Millennium Center for Supernova Science, report optical spectroscopy (range 360-920 nm) of PSN J08071188-2803263 = SN 2013gc, obtained on Nov. 8.3 UT with the Las Campanas 2.5-m du Pont telescope (+ WFCCD). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2013gc is a type-IIn supernova similar to SN 1996L (Benetti et al. 1999, MNRAS 305, 811) at about two months after explosion.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

Electronic Telegram No. 3685

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge,MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2013fx NEAR IC 5279.
G. Pignata, Y. Apostolovski, E. Paillas, S. Varela, F. Bufano, F. Olivares, and K. Takats, Universidad Andres Bello; M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, and F. Carrasco, Universidad de Chile; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B. Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent Supernova (mag approximately 17.9) on an unfiltered image taken on Oct. 21.20 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object is located at R.A. = 23h03m21s.77 +/- 0".2, Decl. = -69o11'18".5 +/- 0".2 (equinox 2000.0), which is about 3".9 west and 0".5 north of center of the presumed host galaxy. Additional CHASE magnitudes for 2013fx: Aug. 28.36, [18.0; Oct. 26.04, 17.0.

S. Spiro, Istituto Nazionale di Astrofisica, Padova Astronomical Observatory; N. Elias-Rosa, Istituto Nazionale di Astrofisica, Padova Astronomical Observatory and Institut de Ciencies de l'Espai, IEEC, Consejo Superior de Investigaciones Cientificas, Barcelona; M. Turatto, S. Benetti, E. Cappellaro, and A. Pastorello, Istituto Nazionale di Astrofisica, Padova Astronomical Observatory; M. Fraser, University of Cambridge; K. Maguire, European Southern Observatory; S. Valenti, University of California at Santa Barbara and Las Cumbres Observatory Global Telescope; S. Taubenberger, Max- Planck-Institute fuer Astrophysik, Garching; S. J. Smartt, K. Smith, D. Young, and C. Inserra, Queen's University, Belfast; M. Sullivan, University of Southampton; and A. Gal-Yam, O. Yaron, and I. Manulis, Weizmann Institute for Science, on behalf of the PESSTO (the Public ESO Spectroscopic Survey for Transient Objects) collaboration (see Valenti et al., posted at website URL http://www.astronomerstelegram.org/?read=4037), report that optical spectroscopy of 2013fx, obtained on Oct. 27.15 UT with the New Technology Telescope (+ EFOSC2; spectral range 360-910 nm), shows that it is a type-Ia supernova at redshift z = 0.06, a few days before maximum light. The classification was made via SNID (Blondin and Tonry 2007, Ap.J. 666, 102 4) and GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383); PESSTO classification spectra can be obtained from website URL http://www.pessto.org/.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

Electronic Telegram No. 3646

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge,MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2013fe NEAR IC 1875 = PSN J03035325-3924202.
R. Antezana, M. Hamuy, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, and R. Ramirez, Universidad de Chile; G. Pignata, Y. Apostolovski, E. Paillas, S. Varela, F. Bufano, F. Olivares, and K. Takats, Universidad Andres Bello; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B. Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 14.4) on an unfiltered image taken on Aug. 13.40 UT with the 0.41-m 'PROMPT 1' telescope located at Cerro Tololo. The new object is located at R.A. = 03h03m53s.25 +/- 0".2, Decl. = -39o24'20".2 +/- 0".2 (equinox 2000.0), which is more than 90" from all the galaxies visible in the field, making difficult the determination of the host. The variable was designated PSN J03035325-3924202 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013fe based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2013fe: July 2.36, [18.5 (CHASE); Aug. 16.26, 14.4 (CHASE); 17.31, 14.5 (CHASE); 19.776, 16.4 (J. Brimacombe, Cairns, Australia; 43-cm telescope + infrared filter; bandpass > 700 nm; position end figures 53s.29, 20".4; image posted at URL http://www.flickr.com/photos/43846774@N02/9554823083/); 20.60, V = 16.06 and I_c = 16.43 (Seiichiro Kiyota, Tsukuba, Japan; T30 0.5-m iTelescope astrograph + FLI PL-6303E camera at Siding Spring; image posted at website URL http://meineko.sakura.ne.jp/ccd/PSN_J03035325-3924202.jpg); 20.772, 16.4 (Brimacombe; position end figures 53s.29, 20".3; image posted at URL http://www.flickr.com/photos/43846774@N02/9558464469/).

F. Bufano and G. Pignata, Universidad Andres Bello, on behalf of the Millennium Center for Supernova Science collaboration, report that an optical spectrogram (range 380-900 nm), obtained on Aug. 26.3 UT at the SOAR telescope (+ Goodman Spectrograph) at Cerro Tololo, shows that PSN J03035325-3924202 = SN 2013fe is a type-Ia supernova. Adopting the recession velocity of the nearby galaxy, IC 1875 (6092 km/s; Lauberts and Valentijn 1989, Surface Photometry Catalogue of the ESO-Uppsala Galaxies, Garching bei Muenchen: European Southern Observatory; via NED), the best fit obtained via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; publicly available at website URL https://gelato.tng.iac.es) to the 2013fe spectrum is with that of SN 1994D at ten days after maximum.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

Electronic Telegram No. 3644

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge,MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html

SUPERNOVA 2013fc IN ESO 154-10 = PSN J02450896-5544273.
G. Pignata, Y. Apostolovski, E. Paillas, S. Varela, F. Bufano, F. Olivares, and K. Takats, Universidad Andres Bello; M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, and R. Ramirez, Universidad de Chile; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B. Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 15.4) on an unfiltered image taken on Aug. 20.21 UT with the 0.41-m 'PROMPT 1' telescope located at Cerro Tololo. The new object is located at R.A. = 2h45m08s.96 +/- 0".2, Decl. = -55o44'27".3 +/- 0".2 (equinox 2000.0), which is about 1".9 east and 0".5 south of the center of the galaxy ESO 154-10. The variable was designated PSN J02450896-5544273 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013fc based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2013fc: July 2.34, [18.0 (CHASE); Aug. 22.23, 15.4 (CHASE); 25.528, V = 15.90 and I_c = 14.75 (Seiichiro Kiyota, Kamagaya, Japan; T30 iTelescope 0.5-m astrograph at Siding Spring; image posted at URL http://meineko.sakura.ne.jp/ccd/PSN_J02450896-5544273.jpg); 25.626, 15.9 (Joseph Brimacombe, Cairns, Australia; 41-cm RCOS telescope + infrared filter; position end figures 09s.00, 27".7; image posted at website URL http://www.flickr.com/photos/43846774@N02/9595702910/).

C. Inserra, Queen's University of Belfast (QUB); E. Kankare, T. Kangas, and S. Mattila, University of Turku; M. Fraser, QUB; R. Scalzo, Australian National University; M. Nicholl, QUB; A. Gal-Yam and O. Yaron, Weizmann Institute for Science; S. Benetti and A. Pastorello, Istituto Nazionale di Astrofisica (INAF), Padova; S. Valenti, Las Cumbres Observatory Global Telescope and University of California at Santa Barbara; S. Taubenberger, Max-Planck-Institut fuer Astrophysik, Garching; S. J. Smartt, K. Smith, and D. Young, QUB; M. Sullivan, University of Southampton; and C. Knapic, M. Molinaro, and R. Smareglia, INAF, Trieste, on behalf of the PESSTO collaboration (see website URL http://www.astronomerstelegram.org/?read=4037), report that an optical spectrogram (range 360-910 nm) of PSN J02450896-5544273 = SN 2013fc, obtained on Aug. 29.41 UT at the 3.6-m New Technology Telescope (+ EFOSC2) at La Silla Observatory, shows it to be a type-IIn supernova. Adopting a recession velocity of 5586 km/s for ESO 154-10 (Loveday et al. 1996, Ap.J. Suppl. 107, 201; via NED), the best fits to the 2013fc spectrum found by GELATO (Harutyunyan et al. 2008, A.Ap. 488,383; publicly available at website URL https://gelato.tng.iac.es

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

Electronic Telegram No. 3600

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge,MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html

SUPERNOVA 2013eg IN ESO 501-84.
M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, and R. Ramirez, Universidad de Chile; G. Pignata, Y. Apostolovski, E. Paillas, and S. Varela, Universidad Andres Bello; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B. Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent Supernova (mag approximately 17.5) on an unfiltered image taken on June 10.10 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object is located at R.A. = 10h43m28s.19 +/- 0".2, Decl. = -25°51'52".1 +/- 0".2 (equinox 2000.0), which is about 1".3 west and 8".6 north of the center of the galaxy ESO 501-84. The variable was designated PSN J10432819-2551521 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013eg based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2013eg: Apr. 11.09, [18.5 (CHASE); June 10.96, 17.2 (CHASE); 13.471, 17.7 (J. Brimacombe, Cairns, Australia; 41-cm telescope + infrared filter; bandpass > 700 nm; position end figures 28s.19, 52".6; image posted at website URL http://www.flickr.com/photos/43846774@N02/9045557269/); 15.482, 18.1 (Brimacombe; position end figures 28s.19, 53".1; image posted at URL http://www.flickr.com/photos/43846774@N02/9320727496/).

K. Takats and G. Pignata, Universidad Andres Bello; and P. Lira, J. Martinez, and J. Mejia, Universidad de Chile, on behalf of the Millennium Center for Supernova Science, report optical spectroscopy (range 360-920 nm) of PSN J10432819-2551521 = SN 2013eg, obtained on July 11.98 UT with the Las Campanas 2.5-m du Pont telescope (+ WFCCD). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2013eg is a type-Ia supernova about three weeks after maximum light.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

Electronic Telegram No. 3566

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge,MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2013dk IN NGC 4038.
[Editor's note: the text below replaces that on CBET 3565] F. Carrasco, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, and R. Ramirez, Universidad de Chile; G. Pignata, Y. Apostolovski, E. Paillas, and S. Varela, Universidad Andres Bello; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B. Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 15.8) on an unfiltered image taken on June 22.12 UT with the 0.41-m 'PROMPT 5' telescope located at Cerro Tololo. The new object is located at R.A. = 12h01m52s.72 +/- 0".2, Decl. = -18o52'18".3 +/- 0".2 (equinox 2000.0). Nothing is visible at this position on archival images taken on Apr. 16.29 (limiting mag 18.5). The variable was designated PSN J12015272-1852183 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013dk based on the spectroscopic confirmation reported below. SNe 1921A, 1974E (cf. IAUC 2653), 2004gt (cf. IAUC 8454, 8456), and 2007sr (cf. CBET 1172) also appeared in NGC 4038. Stuart Parker, Oxford, Canterbury, New Zealand, writes that the object appeared at mag around 15.5 on his exposures taken in poor seeing on June 24.330; his images are posted at website URL http://www.bosssupernova.com/confirmingimages.htm.

A. Harutyunyan, Telescopio Nazionale Galileo (TNG); and S. Benetti, A. Pastorello, E. Cappellaro, L. Tomasella, P. Ochner, and M. Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that an optical spectrogram (range 335-785 nm; resolution 1.5 nm) of 2013dk, obtained on June 23.88 UT with the TNG Telescope (+ Dolores), shows that this is a type-Ic supernova. A good match is found with the type-Ic supernova 1994I (Millard et al. 1999, Ap.J. 527, 746) at about six days before maximum light. The spectrum is dominated by prominent lines of Ca II H and K and Fe II in the blue part -- while in the redder wavelengths, weaker lines are detected at about 566, 601.7, and 631 nm. If they are identified with He I 587.6-nm (possibly blended with Na I D 589.2-nm), Si II 635.5-nm, and C II 658-nm, respectively, expansion velocities of about 13000, 18000, and 14000 km/s are deduced, assuming a redshift of 0.005477 for the parent galaxy (Lauberts and Valentijn 1989, The Surface Photometry Catalogue of the ESO-Uppsala Galaxies, European Southern Observatory; via NED). The Asiago- TNG classification spectra are posted at URL http://sngroup.oapd.inaf.it; classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).

J. Vinko, University of Szeged and University of Texas at Austin; G. H. Marion, J. M. Silverman, and J. C. Wheeler, University of Texas at Austin; T. Szalai, University of Szeged; and R. Quimby, IPMU, University of Tokyo, report that a low-resolution optical spectrogram (wavelength range 350-900 nm) of PSN J12015272-1852183 = SN 2013dk was obtained with the Robert Stobie Spectrograph mounted to the 10-m Southern African Large Telescope on June 23.78 UT. Inspection of the spectrum reveals that the transient is probably a young type-Ic supernova at a few days before maximum light. The SuperNova IDentification Tool (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows good matches with pre-maximum spectra of the normal type-Ic supernova 1994I at a redshift consistent with that of the host galaxy, NGC 4038. If the broad absorption feature appearing near 600.0 nm is attributed to Si II 635.5-nm, then its velocity is measured to be about 18700 km/s. The Ca II near-infrared triplet has no apparent high-velocity component, and its Doppler shift is consistent with that of the Si II feature.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

Electronic Telegram No. 3517

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge,MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2013cg IN NGC 2891.
G. Pignata, Y. Apostolovski, E. Paillas, and S. Varela, Universidad Andres Bello; M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, and R. Ramirez, Universidad de Chile; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B. Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 13.3) on an unfiltered image taken on May 6.03 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. The new object is located at R.A. = 9h26m56s.77 +/- 0".2, Decl. = -24°46'59".6 +/- 0".2 (equinox 2000.0), which is about 1".7 east and 1".0 south of the center of the galaxy NGC 2891. The variable is also barely visible in an image taken under poor weather conditions on Apr. 22.99. The variable was designated PSN J09265677-2446596 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013cg based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2013cg: Apr. 4.04, [18.5 (CHASE); May 8.519, V = 13.98 and I_c = 13.92 (Seiichiro Kiyota, Tsukuba, Japan; iTelescope.net 0.50-m f/6.8 astrograph + FLI-PL6303E camera located at Siding Spring, NSW; measurements very difficult, with the variable very close to the nucleus of NGC 2891; image posted at URL http://meineko.sakura.ne.jp/ccd/PSN_J09265677-2446596.jpg).

K. Takaki, K. Kawaguchi, and K. S. Kawabata, Hiroshima University; and M. Yamanaka, Kyoto University; report that they obtained low-resolution (R = 400) optical spectra of PSN J09265677-2446596 = SN 2013cg on May 11.5 UT at the Higashi-Hiroshima Observatory, Hiroshima University. After the recession velocity of the host galaxy (NGC 2891) is corrected, the spectra show the absorption feature of Si II at 610 nm; this line seems to have a relatively flat-bottomed profile, and the line velocity reaches 12000 km/s. The absorption line of S II around 540 nm is relatively broad and shallow. The absorption line of Si II is seen at 572 nm. These profiles are similar to that of a normal type-Ia supernova at around a week before maximum (Garavini et al. 2007, A.Ap. 471, 527).

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

Electronic Telegram No. 3456

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge,MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html

SUPERNOVA 2013ay IN IC 4745.
M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and R. Ramirez, Universidad de Chile; G. Pignata, Y. Apostolovski, E. Paillas, and S. Varela, Universidad Andres Bello; F. Aros, Pontificia Universidad Catlica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. E. Reichart, J. B. Haislip, J. P. Moore, and A. P. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 15.1) on an unfiltered image taken on Mar. 26.29 UT with the 0.41-m 'PROMPT 1' telescope located at Cerro Tololo. The new object is located at R.A. = 18h42m37s.86 +/- 0".2, Decl. = -64o56'13".5 +/- 0".2 (equinox 2000.0), which is about 12".7 east and 21".3 north of the center of the galaxy IC 4745. The variable was designated PSN J18423786-6456135 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013ay based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2013ay: 2012 Sept. 29.08, [18.2 (CHASE; year assumed); 2013 Mar. 26.29, 15.2 (CHASE); 29.680, 16.4 (Joseph Brimacombe, Cairns, Australia; 41-cm RCOS telescope + infrared filter; bandpass > 700 nm; position end figures 37s.97, 13".4; image posted at URL http://www.flickr.com/photos/43846774@N02/8600797843/); 30.802, 16.7 (Brimacombe; position end figures 37s.90, 13".4; image posted at website URL http://www.flickr.com/photos/43846774@N02/8611320611/).

E. Y. Hsiao and N. Morrell, Las Campanas Observatory; and G. H. Marion, Harvard-Smithsonian Center for Astrophysics report that a near-infrared spectrogram (range 800-2400 nm) of PSN J18423786-6456135 = 2013ay was obtained on Apr. 1.34 UT with the FoldedPort Infrared Echellette (FIRE) spectrograph on the 6.5-m Magellan Baade Telescope. The spectrum shows that 2013ay is a type-Ia supernova a few days past maximum light. The near-infrared spectrum is similar to that of SN 2000dk at 5 days past maximum (Marion et al. 2009, A.J. 138, 727). The supernova redshift approximately matches the redshift of the presumed host galaxy (IC 4745) at z = 0.016.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.

Electronic Telegram No. 33437

Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge,MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2013ak IN ESO 430-20.
F. Carrasco, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, P. Sanchez, C. Hervias, and R. Ramirez, Universidad de Chile; G. Pignata, S. Varela, and Y. Apostolovski, Universidad Andres Bello; F. Aros, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project (which is part of the Millennium Center for Supernova Science collaboration), report the discovery of an apparent supernova (mag approximately 13.5) on an unfiltered image taken on Mar. 9.23 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo. CTIO. The new object is located at R.A. = 8h07m06s.69 +/- 0".2, Decl. = -28°03'10".1 +/- 0".2 (equinox 2000.0), which is about 25".4 west and 1".8 south of center of the galaxy ESO 430-20. The variable was designated PSN J08070669-2803101 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013ak based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2013ak: Feb. 15.15, 18.5 (CHASE); Mar. 11.129, 14.1 (Joseph Brimacombe, Cairns, Australia; remotely with a 51-cm RCOS telescope + luminance filter loated at the New Mexico Skies observatory near Mayhill, NM, U.S.A.; position end figures 06s.69, 10".2; image posted at website URL http://www.flickr.com/photos/43846774@N02/8549210863/).

D. Milisavljevic, Harvard-Smithsonian Center for Astrophysics (CfA); R. Fesen, Dartmouth College; T. Pickering and A. Kniazev, South African Astronomical Observatory and Southern African Large Telescope; J. Parrent, Dartmouth College and Las Cumbres Observatory; and Alicia Soderberg and Raffaella Margutti, CfA, report that low-dispersion spectra (range 350-880 nm), obtained on Mar. 10.9 UT with the 10-m SALT telescope (+ RSS), show PSN J08070669-2803101 = SN 2013ak to be a young type-II supernova not long after outburst. Fitting with the SYN++ software (Thomas et al. 2011, PASP 123, 237) suggests that the broad P-Cyg features seen on a fairly blue continuum are associated with H_alpha, Na I, Ca II, and He I. Using a redshift of z = 0.0037, as measured from narrow emission lines associated with a coincident H II region in the host galaxy (ESO 430-20), they estimate the velocity of the H_alpha absorption feature to be approximately -18500 km/s. The spectra resemble those previously reported for the type-II supernova 2012dy (cf. CBET 3197) and the type-IIb supernova 2011hs (cf. CBET 2902), though in those objects the Fe II absorptions between 400 and 520 nm were stronger.

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.