GCN Circular 14113
Subject
GRB 121226A: Swift/UVOT Upper Limits
Date
2012-12-27T21:17:57Z (11 years ago)
From
Alice Breeveld at MSSL-UCL <aab@mssl.ucl.ac.uk>
A. A. Breeveld (MSSL-UCL) and H. A. Krimm (CRESST/GSFC/USRA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 121226A
104 s after the BAT trigger (Krimm et al., GCN Circ. 14105). No optical
afterglow consistent with the XRT position (Littlejohns et al. GCN Circ.
14112) 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 104 254 147 >20.6
u_FC 317 566 246 >19.6
white 104 18160 1317 >21.6
v 646 10716 1121 >20.4
b 572 17397 1317 >21.3
u 317 16485 1544 >20.9
w1 696 12390 1163 >20.7
m2 671 11621 1298 >21.0
w2 622 6620 351 >20.2
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.055 in the direction of
the burst (Schlegel et al. 1998).