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GCN Circular 4698

GRB060204A: Swift/UVOT observations
2006-02-06T22:26:26Z (18 years ago)
Antonino Cucchiara at PSU <>
A. Cucchiara, D. Fox, S. Hunsberger, A. Retter, J. Nousek (PSU),
W. Voges (MPE), N. Gehrels (GSFC), on behalf of the Swift UVOT team.

The Swift/UVOT began observing the field of GRB 060204A,
detected by INTEGRAL (Mereghetti et al., GCN 4654)
at 00:17:07 UT on 2006-02-05, 10.8 hours after the trigger.
Within the XRT error circle reported by Morris et al. (GCN 4685) we found
a DSS/USNO catalogued object (USNO B1 0505-0367492,
B magnitude = 15.48). This is only 2 arcsecond from the XRT position.
A preliminary analysis of this known source shows a fading behaviour
followed by a rebrightening on a timescale of a day. For comparison, our B
magnitude at the beginning of the observation was 14.14 (+/- 0.03),
corrected for galactic extinction (E(B-V)=0.182)). At the moment, we cannot
infer whether this is the optical afterglow of this GRB or a kind of 
activity due to
the catalogued object. More XRT observations are ongoing to see if the 
XRT source
fades away.

Further analyses are forthcoming.
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