http://www.cbat.eps.harvard.edu/iau/cbet/003900/CBET003962.txt
Electronic Telegram No.3962
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
SUPERNOVA 2014cw IN PGC 68414 = PSN J22152655-1028346
V. Lipunov reports the discovery by S. Shurpakov of a possible
supernova
(mag 16.9) on 180-s unfiltered survey images (limiting mag 17.9) obtained
with
the MASTER Amur robotic telescope (0.40-m f/2.5 reflector) on Aug. 29.544
UT.
The new object is located at R.A. = 22h15m26s.55, Decl. = -10o28'34".6
(equinox 2000.0), which is 7" east and 6" north of the center of the dwarf
irregular galaxy PGC 68414. D. Denisenko and E. Gorbovskoy report that
nothing is present at this position on the images taken by the similar
MASTER
Kislovodsk telescope on July 4.920 (limiting mag 17.9). The MASTER images
are posted at URL http://master.sai.msu.ru/static/OT/221526.55-102834.6.jpg
(reference chart at http://master.sai.msu.ru/static/OT/J2215-1028-JRIR.jpg;
10' x 10' field-of-view). The variable was designated PSN J22152655-1028346
when it was posted at the Central Bureau's TOCP webpage and is here
designated
SN 2014cw based on the spectroscopic confirmation reported below. CCD
magnitudes for 2014cw reported by S. Howerton from images obtained with the
iTelescope T18 instrument at the AstroCamp Observatory, Nerpio, Spain:
Sept.
2.036, 16.1 (luminance filter; 180-s exposure; image posted at website URL
https://www.flickr.com/photos/watchingthesky/14926081550); 2.996, V = 16.0.
N. Elias-Rosa, L. Tartaglia, E. Cappellaro, and A. Pastorello,
Osservatorio Astronomico di Padova, INAF; M. T. Botticella, Osservatorio
Astronomico di Capodimonte, INAF; C. Inserra, Queen's University, Belfast;
K.
Maguire, European Southern Observatory; S. Smartt and K. W. Smith, Queen's
University, Belfast; M. Sullivan, Southampton University; S. Valenti, Las
Cumbres Observatory Global Telescope; O. Yaron, Weizmann Institute for
Science; D. Young, Queen's University, Belfast; and I. Manulis, Weizmann
Institute for Science report that an optical spectrogram (range 398.5-931.5
nm; 1.8-nm resolution) of PSN J22152655-1028346 = SN 2014cw was obtained on
Sept. 2.98 UT with the European Southern Observatory's New Technology
Telescope (+ EFOSC2 and Grism 13) at La Silla under the Public ESO
Spectroscopic Survey for Transient Objects. A good match is found with the
type-II supernova 1999gi (Leonard et al. 2002, A.J. 124, 2490) near maximum
light, assuming a redshift z = 0.006 for the host galaxy. An expansion
velocity of about 10000 km/s is derived from the minimum of the H I 656-nm
line. Classifications was done with SNID (Blondin and Tonry 2007, Ap.J.
666,
1024) and GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383). Classification
spectra can be obtained via WISeREP at website URL http://www.pessto.org.
N. Morrell, M. M. Phillips, and C. Contreras, Las Campanas Observatory;
G. H. Marion, University of Texas, Austin; E. Y. Hsiao, C. Gall, and M. D.
Stritzinger, Aarhus University; and R. P. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report on the spectroscopic classification of PSN
J22152655-1028346 = SN 2014cw using a near-infrared spectrogram (range
800-2500 nm) obtained on Sept. 3.15 UT with the FoldedPort Infrared
Echellette
(FIRE) spectrograph on the 6.5-m Magellan Baade Telescope at Las Campanas.
The near-infrared spectrum is similar to that of SN 2013hj at approximately
10 days past explosion with weak hydrogen Paschen P-Cyg lines at the
approximate redshift of z = 0.01.
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2014 CBAT
2014 September 5 (CBET 3962) Daniel W. E. Green