GCN Circular 32410
Subject
GRB 220715B: Swift/UVOT Upper Limits
Date
2022-07-16T08:26:04Z (2 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 220715B
103 s after the BAT trigger (Troja et al., GCN Circ. 32405).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 32409)
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 103 253 147 >20.1
u_FC 316 565 246 >20.0
white 103 1369 373 >20.4
v 645 1419 97 >18.9
b 571 5005 274 >20.8
u 316 1488 319 >20.1
w1 695 1468 78 >18.8
m2 670 1443 97 >19.8
w2 621 5144 227 >19.9
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.525 in the direction of the burst
(Schlegel et al. 1998).