GCN Circular 11016
Subject
GRB 100728A: Swift/UVOT Upper Limits
Date
2010-07-28T14:01:25Z (14 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and J. K. Cannizzo (NASA/UMBC) report on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of
GRB 100728A 86s after the BAT trigger (Cannizzo et al., GCN 11004).
We do not detect a new source at the enhanced Swift XRT position
(Evans et al. GCN 11005).
The preliminary 3-sigma upper limits for the finding chart exposures
(FC)
and summed images are:
Filter T_start T_stop Exp(s) Mag (3-sigma upper limit)
-------------------------------------------------------------
white (FC) 86 236 147 >20.54
white 578 7432 657 >21.16
u (FC) 299 548 246 >19.82
u 702 7021 490 >20.04
v 628 11695 1218 >20.06
b 554 7226 510 >20.37
uvw1 677 13337 1228 >20.62
uvm2 1255 12600 1337 >20.69
uvw2 604 7554 447 >20.19
-------------------------------------------------------------
The quoted upper limits have not been corrected for the expected
Galactic extinction corresponding to a reddening along the line of
sight of E_(B-V) = 0.18 mag. All photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383, 627).