Electronic Telegram No. 3550
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 2013db IN NGC 3808 = PSN J11404399+2225549
     R. Gagliano, J. Newton, and T. Puckett report the discovery of an
apparent supernova (mag 17.1) on unfiltered CCD images (limiting mag 19.0)
taken with a 0.40-m reflector at Portal, AZ, U.S.A., on May 29.151 UT in the
course of the Puckett Observatory Supernova Search.  The new object is located
at R.A. = 11h40m43s.99, Decl. = +22o25'54".9 (equinox 2000.0), which is 3".9
west and 9".2 north of the center of NGC 3808.  A finding image is located at
website URL http://www.possdata.com/PSNJ11404399+2225549.jpg.  The variable
was designated PSN J11404399+2225549 when it was posted at the Central
Bureau's TOCP webpage and is here designated SN 2013db based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013db:  Mar. 21, [19.1 (Puckett); May 30.132, 17.1 (Puckett; limiting mag
19.1; 0.40-m reflector at Portal); 30.292, 17.0 (Joseph Brimacombe, Cairns,
Australia; remotely with a 51-cm telescope + luminance filter located near
Mayhill, NM, U.S.A.; position end figures 44s.04, 54".9; image posted at
website URL http://www.flickr.com/photos/43846774@N02/8897847606/).

     M. R. Drout, R. Lunnan, and E. Berger, Harvard University, obtained a
low-resolution spectum of PSN J11404399+2225549 = SN 2013db on June 6.15 UT
with the Blue Channel spectrograph mounted on 6.5-m MMT at Mount Hopkins.
Strong hydrogen Balmer P-Cyg lines are present in the spectrum, indicating
that 2013db is a type-II supernova.  Comparison with a library of supernova
spectra using the "Supernova Identification" tool (SNID; Blondin and Tonry
2007, Ap.J. 1024, 666) provides a good match with type-IIP supernovae near
maximum light.  After correcting for the host galaxy (NGC 3808) redshift of
z = 0.023726 (White et al. 1983, MNRAS 203, 701; via NED), the velocity of
the minimum of the H_alpha feature is estimated to be approximately 14500
km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 June 9                      (CBET 3550)              Daniel W. E. Green