GCN Circular 6677
Subject
GRB 070724B: Swift/UVOT Upper limits
Event
Date
2007-07-28T15:46:01Z (18 years ago)
From
Margaret Chester at PSU <chester@astro.psu.edu>
M.M. Chester (PSU) and P. Romano (Uni-Bicocca and OAB) report on behalf
of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 070724B (detected by
SuperAGILE; Feroci et al., GCN Circ. 6668) beginning 2007-07-27 00:02:11
UT, 48.6 hours after the burst trigger time.
We do not find any new source in any of the UVOT observations inside the
refined Swift/XRT error circle for the likely candidate, source #1
(RA,DEC(J2000)= 17.48497, 57.67616, Romano et al., GCN Circ. 6675). We
note a cataloged star, V=18.2, 7.6 arcsec from the XRT position.
The 3-sigma upper limits for detecting a source inside the XRT error
circle in the co-added frames are:
Filter Tstart Tstop Exp Magnitude
(s) (s) (s) (3-sigma UL)
White 179270 197091 1776 21.3
v 175022 196602 2023 19.8
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.51 mag in the
direction of the burst (Schlegel et al. 1998).