GCN Circular 11779
Subject
GRB 110305A: Swift/UVOT Upper Limits
Date
2011-03-06T17:12:42Z (14 years ago)
From
Stefan Immler at NASA/GSFC <stefan.m.immler@nasa.gov>
S. Immler (NASA/CRESST/GSFC) and D. Grupe (PSU) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110305A
113 s after the BAT trigger (Grupe et al., GCN Circ. 11773). No optical
afterglow consistent with the GROND position (Guelbenzu et al., GCN
Circ. 11774) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC)
exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 113 263 147 >20.5
u_FC 271 521 246 >19.6
white 113 18938 1608 >22.3
v 601 11519 1203 >19.7
b 527 24719 2136 >20.9
u 271 30501 3468 >21.5
w1 650 29759 2976 >20.9
m2 632 28858 2261 >20.8
w2 749 7376 426 >19.8
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.39 in the direction of the burst
(Schlegel et al. 1998).