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ROTSE-III Discovery of a Supernova Candidate

ATEL # 2485; Zheng and F. Yuan, University of Michigan; J. Vinko, University of Szeged; R. Quimby, California Institute of Technology; D. Chamarro, M. D. Sisson, N. Whallon, 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 17 Mar 2010; 5:37 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Weikang Zheng (

Subjects: Optical, Nova, Supernova, Transients
Referred to by ATEL #: 2489

We report the discovery of a SN candidate, ROTSE3 J125708.9-172527, in unfiltered CCD images taken on March 08.53 UT at about 17.6 mag with the 0.45-m ROTSE-IIIa telescope at Siding Spring Observatory, Australia. The transient was detected again on March 09.53 (at mag about 17.5) and March 15.51 (mag about 17.6) from ROTSE-IIIa, and also, on March 16.10 (mag about 17.5) and March 16.89 (mag about 17.4) from ROTSE-IIIc telescope at the H.E.S.S. site in Namibia. No credible brightness change can be estimated during the observation time range due to photometric uncertainty. The new object is located at RA = 12h57m08s.93, Dec = -17o25'27".1, which is 1.1" west and 13.0" south to the center of galaxy NFP J125709.0-172514 with redshift z~0.0494 (Rawle et al., 2008, MNRAS, 385, 2097; via. SIMBAD). No source was detected at this location in the ROTSE-IIIa data (limit ~18.0 mag) before Feb 15 UT. A finding chart of the transient is posted at the following website URL:

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