[IAUC] CBET 2792: 20110826 : SUPERNOVA 2011fe IN M101 = PSN J14030581+5416254

Mie Sep 14 16:18:42 ART 2011

                                                  Electronic Telegram No. 2792
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 2011fe IN M101 = PSN J14030581+5416254
     Peter E. Nugent, Lawrence Berkeley National Laboratory (LBL) and
University of California at Berkeley; Mark Sullivan, Oxford University; David
Bersier, Liverpool John Moores University; D. A. Howell, Las Cumbres
Observatory Global Telescope and University of California at Santa Barbara;
Rollin Thomas, LBL; and Phil James, Liverpool John Moores University, report
report the discovery of a type-Ia supernova (magnitude g = 17.2) by the
"Type Ia supernova science working group of the Palomar Transient Factory"
on g-band images obtained with the Oschin 1.2-m Schmidt telescope at Palomar
on Aug. 24 UT.  The supernova is located at R.A. = 14h03m05s.81, Decl. =
+54d16'25".4 (equinox 2000.0), which (according to D. Bishop, Rochester, NY,
USA) is 59" west and 271" south of the center of M101; nothing was visible at
this position on an image from Aug. 23 (limiting mag 20.6).  The variable was
designated PSN J14030581+5416254 when posted on Aug. 24.99 on the Central
Bureau's TOCP webpage by Bishop and is here designated SN 2011fe based on the
spectroscopic report below by Nugent et al.  A preliminary spectrum obtained
on Aug. 24 UT with FRODOSPEC on the Liverpool Telescope indicates that 2011fe
is probably a very young type-Ia supernova; broad absorption lines
(particularly the Ca II infrared triplet) are visible.  The presence of an
H-alpha feature is confidently rejected.

     Additional magnitudes for SN 2011fe, reported in part by E. Waagen,
AAVSO (unfiltered CCD unless otherwise noted):  Aug. 24.910 UT, 12 (Mathew
A. Marulla and Tavi A. Grenier, 0.5-m f/6.8 corrected Dall-Kirkham telescope
+ FLI PL09000 CCD camera, SLOOH Canary Islands Observatory, Mt. Teide;
independent discovery; position end figures 33s.2, 13'16"; offset 3'26" from
the center of M101 in p.a. 191.4 deg; discovery image posted at website URL
http://admin.slooh.com/files/m101_position.png); Aug. 25.093, V = 14.89 +/-
0.07 (J. Roe, Wentzville, MO, U.S.A.); Aug. 25.130, V = 14.79 +/- 0.02 (S.
Howerton, Arkansas City, KS, U.S.A.); Aug. 25.16, 14.8 (R. A. Koff, Bennett,
CO, U.S.A.; Meade 0.25-m f/10 reflector + Apogee AP-47p CCD camera; position
end figures 05s.75, 16'25".2; nothing visible at this position on the
Digitized Sky Survey to limiting mag 18.5, bandpass not noted); Aug. 25.200,
14.7 (R. Royer, Springville, CA, U.S.A.; visual); Aug. 25.200, 14.9 (Joseph
Brimacombe, Cairns, Australia; position end figures 05".74, 16'25".3; image
posted at website URL http://www.flickr.com/photos/43846774@N02/6079812340/);
Aug. 25.83, R = 13.9 +/- 0.3, V = 13.8 +/- 0.3, B = 13.8 +/- 0.3 (K.
Sarneczky, 0.60-m Schmidt telescope, Konkoly Observatory, Hungary); Aug.
25.853, 13.4 (Gianluca Masi, using 0.43-m f/6.8 telescope of the Virtual
Telescope robotic facility in Ceccano, Italy; position end figures 05s.74,
16'25".7, using 295 reference stars from the NOMAD catalogue).  Masi's image
is posted at URL http://virtualtelescope.bellatrixobservatory.org/m101sn.html.
Koff's image is posted at the following website URL:
http://antelopehillsobservatory.org/SNpictures/PSNJ14030581+5416254final.jpg.


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                         (C) Copyright 2011 CBAT
2011 August 26                   (CBET 2792)              Daniel W. E. Green