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Swift follow-up of the optical transient MASTER OT 082752.77+704606.0

ATel #3265; K. V. Sokolovsky (MPIfR/ASC Lebedev)
on 7 Apr 2011; 14:11 UT
Credential Certification: Frank Schinzel (schinzel@mpifr-bonn.mpg.de)

Subjects: Optical, Ultra-Violet, X-ray, AGN, Quasar, Transient

Referred to by ATel #: 3367

Following the report in ATel #3255 on the discovery and spectroscopy of the optical transient MASTER OT 082752.77+704606.0, observations were performed in ultraviolet and X-ray bands by the Swift satellite. The observations had a total exposure time of 2.1ks and were conducted on 2011-04-06 during two visits of the source separated by 97.8 minutes (one orbit).

The transient is clearly visible in W2 band Swift/UVOT ultraviolet images at a position of 08:27:52.81 +70:46:07.8 (+/-0.5", J2000), 1.8" away from the position reported in ATel #3255. Variability of the source is detected between the two visits:
JD(TT)W2err.
2455657.5378918.390.06
2455657.6058018.140.05
This variation is confirmed through comparison with magnitude differences of field stars of similar brightness between the two visits.

No X-ray counterpart of the optical transient is detected by Swift/XRT. The only X-ray source in the field of view at the position of 08:28:57.35 +70:44:38.0 (+/-6", J2000; XRT count rate 0.011 +/-0.02cts) is 5.5' away from the transient and can be firmly identified with the QSO candidate GALEX 2682502750548263862 (Atlee & Gould, 2007, ApJ, 664, 53).

The absence of an X-ray counterpart and fast ultraviolet variability question, but cannot rule out, the AGN nature of the flaring object MASTER OT 082752.77+704606.0.

We thank the Swift Team for their rapid scheduling of this observation.

Finding chart for the object