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ROTSE-III Discovery of a Supernova Candidate

ATEL # 2790; W. Zheng and R. Anastasiya (University of Michigan); J. Vinko (University of Szeged); R. Quimby (California Institute of Technology); F. Yuan, N. Whallon, Y. Chen, C. Akerlof, and S. B. Pandey (University of Michigan); J. C. Wheeler and E. Chatzopoulos (University of Texas), on behalf of the ROTSE collaboration
on 15 Aug 2010; 15:06 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Weikang Zheng (

Subjects: Optical, Nova, Supernova, Transients

We report the discovery of a SN candidate, ROTSE3 J235704.6-341106, in unfiltered CCD images taken on July 17.02 UT with the 0.45-m ROTSE-IIIc telescope at the H.E.S.S. site in Namibia at about 18.0 mag. The transient was detected on the following days from ROTSE-IIIc, and the light curve showed it reached peak around July 23th with mag about 16.8 and then decayed after that to about 18.0 mag on Aug. 12.98 UT. The new object is located at RA= 23h57m04s.57, Dec= -34o11'05".5, which is 0" east and 0.5" south to the center of galaxy 6dFGS gJ235704.6-341105 (z~0.0470 according to SIMBAD). No source was detected at this location in the ROTSE-IIIc image (limit ~18.5 mag) before July 16th UT. A finding chart of the transient is posted at the following website URL:

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R. E. Rutledge , Editor
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