Electronic Telegram No. 3609
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 2013ej IN M74 = PSN J01364816+1545310
     S. Valenti, Las Cumbres Observatory Global Telescope (LCOGT) and
University of California at Santa Barbara (UCSB); D. Sand, Texas Tech
University; D. A. Howell and M. L. Graham, LCOGT/UCSB; J. T. Parrent,
LCOGT and Dartmouth College; W. Zheng, University of California at Berkeley;
and B. Cenko, Goddard Space Flight Center, report that a spectrogram (range
320-1000 nm) of PSN J01364816+1545310 = SN 2013ej (cf. CBET 3606), obtained
robotically on July 27.73 UT with the FLOYDS spectrograph on the "Faulkes
Telescope South" at Siding Spring, shows a blue continuum with Balmer lines
typical of a young type-II supernova.  Fits to a library of spectra using the
Superfit, Gelato, and SNID software show a best match with early spectra of
SN 1999gi (IAUC 7329).

    G. Dhungana, Southern Methodist University; J. Vinko, University of
Szeged; J. C. Wheeler and J. M. Silverman, University of Texas; W. Zheng,
University of California at Berkeley; R. Kehoe and F. V. Ferrante, Southern
Methodist University; G. H. Marion, University of Texas; R. Quimby, Kavli
IPMU, University of Tokyo; F. Yuan, Australian National University; and C.
Akerlof, University of Michigan, on behalf of the ROTSE collaboration, report
the pre-discovery detection of SN 2013ej (cf. CBET 3606) in unfiltered images
taken on July 25.38 UT with the 0.45-m ROTSE-IIIb telescope at McDonald
Observatory (1h41m earlier than the discovery epoch reported via KAIT).  The
brightness of the supernova estimated from PSF photometry on four consecutive
images is 13.4.
     Anthony Ayiomamitis, Athens, Greece, reports that five fully calibrated
R-band exposures taken with a 30.5-cm RHA astrograph on July 28.02 and 28.15
UT yield mag 12.71.
     E. O. Waagen, AAVSO, provides the following additional magnitudes for
SN 2013ej (made via CCD unless noted otherwise):  July 27.257 UT, V = 13.01
(M. Cook, Newcastle, ON, Canada); 27.406, V = 12.80 (B. Harris, New Smyrna
Beach, FL, U.S.A.); 28.013, V = 12.84 (A. Sonka, Bucharest, Romania); 28.055,
V = 12.88 (N. Stritof, Ljubljana, Slovenia); 28.256, V = 12.86 (H. Smith,
East Lansing, MI, U.S.A.); 28.258, B = 12.82 (Smith); 28.356, V = 12.54
(Harris); 29.346, 12.5 (A. Amorim, Florianopolis, Brazil; visual); 29.415, V
= 12.41 (Harris); 29.692, V = 12.74 (A. Novichonok, Kondopoga, Russian
Federation); 29.693, R = 12.39 (Novichonok); 29.694, B = 13.46 (Novichonok);
30.083, 12.6 (K. Wenzel, Grossostheim, Germany; visual); 30.218, V = 12.68
(Smith); 30.262, B = 12.69 (Smith); 30.423, V = 12.52 (K. Kida, Elblag,
Poland).


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

                         (C) Copyright 2013 CBAT
2013 August 1                    (CBET 3609)              Daniel W. E. Green