GCN Circular 11139
Subject
GRB 100823A: Swift/UVOT Upper Limits
Date
2010-08-24T04:37:39Z (14 years ago)
From
Margaret Chester at PSU <chester@astro.psu.edu>
M.M. Chester (PSU) and V. Mangano (INAF-IASFPA) report on behalf of
the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 100823A
78 s after the BAT trigger (Mangano et al., GCN Circ. 11135). No
optical afterglow consistent with the enhanced Swift/XRT position
(Goad et al., GCN Circ. 11136) is detected in the initial UVOT
exposures. Preliminary 3-sigma upper limits using the UVOT
photometric system (Poole et al. 2008, MNRAS, 383, 627) for the
white and u finding chart (FC) and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 78 227 147 >20.1
u_FC 290 539 246 >19.4
white 78 17439 2181 >21.9
v 619 22361 1331 >20.5
b 545 16528 1278 >21.3
u 290 6512 639 >20.4
w1 669 6307 432 >20.2
m2 816 6102 413 >20.8
w2 767 18242 2082 >21.2
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).