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ATEL # 1272; F. Yuan, J. Aretakis, C. Akerlof, T. Mckay (U. Mich.) and E. Rykoff (UCSB) report on behalf of the ROTSE collaboration
on 12 Nov 2007; 23:18 UT
Password Certification: Fang Yuan (firstname.lastname@example.org)
Subjects: Optical, Cataclysmic Variables, Transients
We report the discovery of two optical transients, ROTSE3 J031031+431115 and ROTSE3 J113709+513451 in unfiltered CCD images taken by the 0.45m ROTSE-IIIb telescope at McDonald Observatory, Texas.
The first object, located at RA: 03:10:31.24 Dec: 43:11:14.6 (J2000, uncertainty <1") was observed at 17.0 mag on Sep 7.42 UT, 17.0 mag on Oct 19.26 UT and 18.0 mag on Oct 20.26 UT. Before November and other than the reported dates, it is below our detecting limit from about 17th to 19th mag. More recently, it was observed at 18.4 mag on Nov 1.24 UT, rose to 16.4 mag on Nov 8.23 UT and then decayed to 17.0 mag on Nov 12.20 UT. This transient has a R~19.1 counterpart in USNO-B1.0 catalog. According to the crude photometry of the USNO-B catalog, it is bluer than nearby field stars and thus is tentatively categorized as a galactic CV. More information including finding chart and light curves can be found at: http://rotse.net/transients/j0310+4311/index.html
The second object, located at RA: 11:37:08.65 Dec: 51:34:51.1 (J2000, uncertainty <1') was observed to rise from 18.3 mag to 17.2 mag on Nov 2.64 UT to Nov 3.46 UT and then decayed to 18.5 mag on Nov 12.44 UT. It was not detected to limiting mag of about 18 before the first detection. This transient has a r~20.1 counterpart in SDSS which is blue according to SDSS color measurements. It is also tentatively categorized as a galactic CV. More information including finding chart and a light curve can be found at: http://rotse.net/transients/j1137+5134/index.html