Electronic Telegram No. 3807
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 2014J IN M82
     D. Li, C. Telesco, and C. Packham, University of Florida, on behalf of
the CanariCam Science Team, report the first detection at 10 micrometers of
the type-Ia supernova 2014J in M82 (cf. CBET 3792).  Four 200-s (on-source,
excluding overhead) exposures -- two at 10.3 micrometers and two at 11.75
micrometers, were acquired with CanariCam on the 10.4-m Gran Telescopio
Canarias (GTC) starting at Feb. 10.12 UT.  The supernova is visible at both
wavelengths and is the only source detected in the imager field-of-view.
The source location in the field-of-view was 3" from the imager center (i.e.,
the nominal location of the supernova), which is within the absolute
pointing accuracy of the telescope that night.  The flux densities of the
supernova are 7.2 (+/- 2.9) mJy at 10.3 micrometers and 12.4 (+/- 3.0) mJy at
11.75 micrometers.  The combined value is 9.8 (+/- 2.1) mJy at a nominal
wavelength of 11.0 micrometers.  These data were obtained using the CanariCam
Guaranteed Time; the GTC is a joint initiative of Spain, the University of
Florida, and Mexico.

     Arto Oksanen, Muurame, Finland, reports the following pre-discovery
magnitudes measured by himself for 2014J from CCD images taken by A.
Murtovaara (Kiiminki, Finland; 0.25-m f/4 reflector):  Jan. 11.670 UT, [16.0
(unfiltered); 17.699, R = 13.0; 17.749, G = 13.6; 17.798, B = 15.03; 18.779,
R = 13.3; 18.741, G = 13.1; 18.681, B = 14.44.  The supernova is saturated in
the R- and G-band images.
     S. Nakano, Sumoto, Japan, reports the following CCD magnitudes measured
by Katsumi Yoshimoto (Yamaguchi; 0.16-m f/6.3 reflector + Johnson-Cousins
filters + STXEi camera) for 2014J:  Jan. 26.754 UT, V = 10.88; 26.756, R_c
= 10.24; 26.758, I_c = 9.85; 26.761, B = 12.11.
     Visual magnitude estimates:  Jan. 25.875 UT, 11.1 (M. Lehky, Hradec
Kralove, Czech Republic); 28.817, 10.9 (Patrick Schmeer, Bischmisheim,
Germany).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 February 17                 (CBET 3807)              Daniel W. E. Green