GCN Circular 13312
Subject
GRB 120521A: Swift/UVOT Upper Limits
Date
2012-05-21T14:05:01Z (12 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and M. M. Chester (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120521A
77 s after the BAT trigger (Chester et al., GCN Circ. 13302).
No optical afterglow consistent with the XRT position
(Goad et al., GCN Circ. 13304) 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 77 227 147 >21.4
u_FC 289 539 246 >20.9
white 77 5491 363 >21.9
v 4266 5901 393 >19.7
b 545 11343 766 >21.9
u 289 10775 1386 >21.6
w1 4676 6312 393 >20.4
m2 4470 6106 393 >20.6
w2 4061 5697 393 >20.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.43 in the direction of the burst
(Schlegel et al. 1998).