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Swift J1910.2-0546: Optical Variability

ATel #4195; Christopher T. Britt, Christopher C. B. Johnson, Robert I. Hynes (Louisiana State University)
on 20 Jun 2012; 20:53 UT
Credential Certification: Robert Hynes (rih@phys.lsu.edu)

Subjects: Optical, X-ray, Transient

Referred to by ATel #: 4210, 4246

We report on optical photometry of the optical counterpart to the new high energy transient SWIFT J1910.2-0546 (ATEL#4139,ATEL#4140) obtained with the 0.9m SMARTS Consortium telescope at the Cerro Tololo Inter-American Observatory in Chile. We confirm the identification of the bright optical counterpart in ATEL#4144,ATEL#4145,ATEL#4146.

We obtained observations over a 4 night period. We observed the target for one hour each on June 1st and June 3rd, and for 7 hours on June 4th. The first observation was on HJD 56080.945 with a magnitude r'=15.50 +/- 0.01, the second was on HJD 56082.930 with r'=15.42 +/- 0.01, and the last observation was on HJD 5683.805 with r'=15.40 +/- 0.01, where both times and magnitudes are averages of the data taken on those nights. The uncertainty quoted is that of our local calibration relative to a field comparison star. The field comparison star was calibrated relative to NOAO Southern Standard Stars for the u'g'r'i'z' system and the uncertainty in this calibration can be expected to be somewhat larger than 0.01 magnitudes.

Short term variability was seen in all observations and is dominated by flickering of up to 0.1 magnitudes on the time scale of an hour. The variations do not appear to be periodic and a period search showed no significant periodicity in our data set.