GCN Circular 32371
Subject
GRB 220711B: Swift/UVOT Upper Limits
Date
2022-07-12T05:02:33Z (2 years ago)
From
Noel Klingler at NASA-GSFC / UMBC <njk5441@psu.edu>
N. J. Klingler (GSFC/UMBC/CRESTII) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 220711B
114 s after the BAT trigger (D'Ai et al., GCN Circ. 32366).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 32370)
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 114 264 147 >21.0
u_FC 326 576 246 >20.2
white 114 915 221 >21.0
v 655 4601 236 >19.7
b 581 773 39 >19.7
u 326 5120 368 >20.4
w1 704 5011 216 >20.5
m2 852 4806 216 >19.4
w2 631 4396 216 >20.4
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.067 in the direction of the burst
(Schlegel et al. 1998).