GCN Circular 12618
Subject
GRB 111204A: Swift/UVOT Upper Limits
Date
2011-12-04T21:19:05Z (13 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and E. Sonbas (GSFC/USRA/Adiyaman_Univ.)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 111204A
143 s after the BAT trigger (Sonbas et al., GCN Circ. 12612).
No optical afterglow consistent with the XRT position
(Beardmore et al., GCN Circ. 12614) 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 143 293 147 >20.4
white 143 5439 541 >21.6
v 4214 5851 393 >19.6
b 3599 11889 1054 >20.8
u 302 11204 1116 >21.3
w1 4624 10291 1133 >20.7
m2 4419 15631 869 >21.1
w2 4009 5646 393 >20.8
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).