GCN Circular 13331
Subject
GRB 120521C: Swift/UVOT Upper Limits
Date
2012-05-22T11:01:12Z (12 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and W. H. Baumgartner (GSFC/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120521C
77 s after the BAT trigger (Baumgartner et al., GCN Circ. 13318).
No optical afterglow consistent with the XRT position
(Beardmore et al., GCN Circ. 13324)
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 >20.9
u_FC 289 539 246 >20.4
white 77 2226 470 >21.7
v 621 2276 194 >19.8
b 546 2201 156 >20.4
u 289 2177 343 >20.7
w1 670 2325 194 >20.4
m2 645 2128 136 >19.9
w2 596 2251 156 >20.4
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).