GCN Circular 11072
Subject
GRB 100807A: Swift/UVOT Upper Limits
Event
Date
2010-08-07T15:57:36Z (15 years ago)
From
Craig Swenson at PSU/Swift <cswenson@astro.psu.edu>
C. A. Swenson and D. Grupe (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 100807A
91 s after the BAT trigger (Grupe et al., GCN Circ. 11067). No optical
afterglow consistent with the enhanced XRT position (Osborne et al.,
GCN Circ. 11070) 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 91 240 147 >20.9
u_FC 304 553 246 >20.4
white 91 5947 530 >21.8
v 634 6358 255 >19.6
b 559 7063 319 >21.1
u 304 6973 659 >21.1
w1 683 6768 413 >20.8
m2 6363 6563 197 >20.7
w2 609 6153 255 >20.8
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.81 in the direction of the burst
(Schlegel et al. 1998).