GCN Circular 42286
Subject
GRB 251014D: Swift/UVOT Upper Limits
Event
Date
2025-10-15T12:45:11Z (16 days ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
Via
email
A.A. Breeveld (UCL-MSSL) and N. J. Klingler (GSFC/UMBC/CRESSTII) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 251014D 160 s after the BAT trigger (Klingler et al., GCN Circ. 42274).
No optical afterglow consistent with the XRT position (Page et al., GCN Circ. 42284)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 160 310 147 >20.7
white 160 4287 344 >20.9
v 4498 4697 197 >19.2
b 3882 5439 317 >19.9
u 318 5312 204 >19.8
w1 4907 5107 197 >19.7
m2 4702 4902 197 >19.6
w2 4293 4493 197 >19.4
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.020 in the direction of the burst (Schlegel et al. 1998).