GCN Circular 37683
Subject
GRB 241002A: Swift/UVOT Upper Limits
Date
2024-10-02T17:06:04Z (8 days ago)
From
Sam Shilling at Lancaster University <shilling.sam@gmail.com>
Via
Web form
S. P. R. Shilling (Lancaster U.), S. R. Oates (Lancaster U.),
N. P. M. Kuin (UCL-MSSL) and R. Caputo (GSFC) report on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 241002A
116 s after the BAT trigger (Caputo et al., GCN Circ. 37662).
No optical afterglow consistent with the enhanced XRT position
(Osborne et al., GCN Circ. 37665) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 116 266 147 >19.9
white 4616 10268 1081 >21.4
v 5027 16800 1081 >19.8
b 4412 5944 292 >19.8
u 4206 5841 393 >19.6
uw1 5437 5637 197 >19.0
uw2 4822 11104 1014 >20.5
um2 5232 22035 1477 >20.3
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.011 in the direction of the burst
(Schlegel et al. 1998).