TITLE: GCN CIRCULAR NUMBER: 42954 SUBJECT: GRB 251201B: Swift/UVOT Detection DATE: 25/12/02 15:52:28 GMT FROM: Paul Kuin at MSSL npkuin@gmail.com
N.P.M. Kuin (UCL-MSSL) and M. J. Moss (GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 251201B 101 s after the BAT trigger (Moss et al., GCN Circ. 42924). A source consistent with the XRT position is detected in the initial UVOT exposures.
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 101 251 147 17.31 +/- 0.03 v 644 663 19 15.97 +/- 0.12 b 570 589 20 16.71 +/- 0.10 u 314 564 246 16.48 +/- 0.04 w1 693 1808 117 18.35 +/- 0.18 m2 668 1093 39 >18.7 w2 1196 1562 39 >18.8
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.008 in the direction of the burst (Schlegel et al. 1998).
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