GCN Circular 7953
Subject
UVOT observations of GRB080707
Date
2008-07-07T22:52:44Z (16 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (MSSL-UCL) and F.E. Marshall (NASA/GSFC) report on behalf of the
Swift/UVOT team:
The Swift/UVOT starting taking settled exposures of the field of GRB
080707 80 s after the BAT trigger (Schady et al., GCN Circ. 7947). A faint
source is detected in the early white and v-band observations at
RA(J2000.0) = 02:10:28.40 = 32.61833
Dec(J2000.0) = +33:06:34.2 = 33.10950
with an of 1.1 arcseconds (90% confidence), consistent with the enhanced
XRT error circle (Starling et al., GCN Circ. 7951) and the GROND position
(Clemens et al., GCN 7948).
The early-time afterglow and 3-sigma upper limits the in co-added frames
are as follows:
Filter T_start(s) T_stop(s) Exp(s) Mag/3-sigma UL
white 80 5469 294.0 21.40+/-0.31 (3.4 sigma)
white 11355 12221 844.3 > 21.93
v 186 5880 590.1 19.97+/-0.31 (3.4 sigma)
b 3971 18004 1502.6 > 21.74
u 640 17362 1040.0 > 21.18
uvw1 616 16449 1101.7 > 21.41
uvm2 591 22234 1101.7 > 21.29
uvw2 5477 5676 196.6 > 20.22
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E(B-V) = 0.10 mag in the
direction of the burst (Schlegel et al. 1998).