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ROTSE-III discovery of a SN candidate

ATel #2128; F. Yuan, University of Michigan; J. Vinko, University of Texas; R. Quimby, California Institute of Technology; D. Chamarro, M. D. Sisson, C. Akerlof, S. B. Pandey, University of Michigan; J. C. Wheeler and E. Chatzopoulos, University of Texas, on behalf of the ROTSE collaboration
on 14 Jul 2009; 01:18 UT
Credential Certification: Fang Yuan (yuanfang@umich.edu)

Subjects: Optical, Nova, Supernovae, Transient

We report the discovery of a SN candidate, ROTSE3 J203837.4-250656, in unfiltered CCD images taken on Jul 11.90 UT with the 0.45-m ROTSE-IIIc telescope at the H.E.S.S. site in Namibia. The transient was detected at about 17.0 magnitude on both Jul 11.90 UT and Jul 12.89 UT. It is located at RA= 20h38m37s.42 , Dec= -25o06'56".0, which is 26" west and 33'' north to the center of galaxy MCG-04-48-026. No source was detected at this location in the DSS2 images and the ROTSE-III reference image (limit ~19.3 mag) constructed from images taken between Jun. 2008 and Aug. 2008.

A finding chart of the transient is posted at the following website URL:
The transient is slightly blended with an object (R~18.2 in USNOB 1.0) to its southeast in the ROTSE-III images.