GCN Circular 33016
Subject
GRB 221202A: Swift/UVOT Detection
Date
2022-12-03T21:07:48Z (a year ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
Paul Kuin (MSSL-UCL) and R. Caputo (GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 221202A
102 s after the BAT trigger (Caputo et al., GCN Circ. 33005).
A source consistent with the XRT position (Beardmore et al. GCN Circ. 33008)
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 102 733 186 20.66 +/- 0.20
v 590 4820 216 >19.9
b 516 709 39 >19.8
u 260 857 285 >19.7
w1 640 832 39 >20.8
m2 615 808 39 >18.1
w2 566 4635 235 >20.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.027 in the direction of the burst
(Schlegel et al. 1998).