Electronic Telegram No. 3171
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2012dm
     M. Fraser, R. Kotak, D. Wright, K. Smith, S. J. Smartt, L. Magill, and
M. McCrum, Queens University, Belfast, report the discovery and spectroscopic
classification of a supernova from the PanSTARRS-1 (PS1) Medium Deep Survey.
The new object was discovered in the PS1 Medium Deep Survey at magnitude y =
20.3 +/- 0.3 on June 27.  The transient appears to be coincident with the
nucleus of the SDSS galaxy J141346.13+521317.3 (thus at R.A. = 14h13m46s.13,
Decl. = +52d13'17".3, equinox 2000.0), with a redshift of 0.078.  The variable
was subsequently detected at magnitudes g = 19.5 on June 27 and z = 19.4 on
June 30.  An optical spectrogram of 2012dm was obtained by J. Jensen-Hansen
with the Nordic Optical Telescope (+ ALFOSC + Grism#4; range 320-910 nm,
resolution about 1.4 nm) on July 7.  The spectrum of 2012dm is best matched
by the SuperNova IDentification code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) to a normal type-Ia supernova at five days after maximum light.  The
discovery of 2012dm was enabled using the PS1 System operated by the PS1
Science Consortium and its member institutions (see website URL
http://www.ps1sc.org/PS1_System_ATel.htm); the authors thank the PS1 telescope
operators for their support of PS1 observations.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2012 CBAT
2012 July 10                     (CBET 3171)              Daniel W. E. Green