GCN Circular 4373
Subject
GRB 051221: Swift/UVOT upper limits
Event
Date
2005-12-21T16:53:16Z (20 years ago)
From
Alice Breeveld at MSSL-UCL <aad@mssl.ucl.ac.uk>
A. A. Breeveld (UCL-MSSL), F. Marshall (GSFC), A. Parsons (GSFC), P.
Mezsaros (PSU), M. Chester (PSU) on behalf of the Swift/UVOT team
The Swift/UVOT began the settling exposure of the field of GRB 051221 at
01:52:29 on 2005-12-21, 73s after the BAT trigger (Parsons et al. GCN
4363). The 86s delay reported in GCN 4363 did not include the settling
exposure. No source was detected at the XRT position (Burrows et al. GCN
4366) nor the candidate IR position (Bloom, GCN 4368) down to the
following 5-sigma upper limits. No correction has been made for the
expected visual extinction of about 0.23 magnitudes.
Filter T_range(s) Summed exposure times 5sigUL(mag)
V 73 - 12530 1109 19.2
B 453 - 19212 2098 20.8
U 399 - 18305 2098 20.2
W1 345 - 14127 1080 20.3
M2 290 - 13437 1298 20.7
W2 562 - 8341 1119 20.7
white 507 - 934 99.5 19.2