GCN Circular 13330
Subject
GRB 120521B: Swift/UVOT Upper Limits
Date
2012-05-22T10:59:58Z (12 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and J. R. Cummings (NASA/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120521B
127 s after the BAT trigger (Cummings et al., GCN Circ. 13305).
No optical afterglow consistent with the XRT position (Osborne et al., GCN Circ. 13311)
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 127 277 147 >19.4
u_FC 286 535 246 >19.4
white 127 30912 2930 >19.8
v 615 23584 2045 >18.7
b 541 36686 2819 >19.7
u 286 36128 2526 >20.2
w1 665 35215 2046 >20.7
m2 5582 24489 1279 >21.0
w2 765 19363 1746 >21.1
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.45 in the direction of the burst
(Schlegel et al. 1998).