GCN Circular 13508
Subject
GRB 120722A: Swift/UVOT Upper Limits
Date
2012-07-23T16:33:17Z (12 years ago)
From
Tyler Pritchard at PSU <tapritchard@astro.psu.edu>
T. A. Pritchard (PSU) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120722A
157 s after the BAT trigger (Melandri et al., GCN Circ. 13499).
No optical afterglow consistent with the Enhanced Swift-XRT position
(Evans et al., GCN Circ. 13502)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 157 307 147 >20.9
u_FC 315 565 246 >20.2
white 157 7159 685 >21.7
v 646 11696 1356 >20.5
b 570 18708 758 >21.4
u 315 18411 1583 >21.6
w1 696 16188 820 >21.3
m2 4785 12602 1279 >21.1
w2 1028 6012 216 >20.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).