GCN Circular 35134
Subject
GRB231117A: Swift-UVOT detection
Date
2023-11-20T12:29:35Z (10 months ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
Via
legacy email
N.P.M. Kuin (MSSL/UCL) and S. L. Laha (GSFC/UMBC) report
on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 231117A
106 s after the BAT trigger (Laha et al., GCN Circ. 35071).
A source consistent with the XRT position (Beardmore et al.,
GCN Circ. 35074 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 106 1713 392 21.21 +/- 0.27
v 648 1418 78 >18.8
b 574 1688 78 >19.3
u 318 741 265 >19.9
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.071 in the direction of the burst
(Schlegel et al. 1998).