GCN Circular 32354
Subject
GRB 220708A: Swift/UVOT Upper Limits
Event
Date
2022-07-09T03:01:38Z (4 years ago)
From
Alexander Belles at PSU/Swift <aub1461@psu.edu>
A. Belles (PSU) and V. D'Elia (SSDC & INAF-OAR)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 220708A
2473 s after the BAT trigger (D'Elia et al., GCN Circ. 32343).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 32347)
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 2473 2622 147 >19.8
white 2473 8325 402 >20.2
v 2934 3134 197 >18.9
b 2680 3954 216 >20.1
u 2655 3749 216 >19.9
w1 2630 3544 216 >19.3
m2 3139 3339 197 >19.3
w2 2730 2930 197 >19.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.169 in the direction of the burst
(Schlegel et al. 1998).