GCN Circular 6611
Subject
Swift/UVOT Observations of GRB070707
Event
Date
2007-07-08T18:56:30Z (18 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (MSSL-UCL) and A. Parsons (GSFC) report on the behalf of the
Swift UVOT team:
The Swift/UVOT observed the field of INTEGRAL burst, GRB070707 starting 8.8hrs
after the INTEGRAL trigger (Beckmann et al. 2007, GCN Circ. 6606). We do not
find any new source in any of the UVOT observations inside the refined INTEGRAL
error circle (Gotz et al. 2007, GCN Circ. 6607) or XRT error circle (Beardmore
et al. 2007, GCN 6610)
The 3-sigma upper limits for detecting a source inside the refined XRT
error circle in the initial data products are:
Filter T_mid(s) Exp(s) Mag (3-sigma upper limit)
-------------------------------------------------------
V 53885 543 19.7
B 31910 324 20.6
U 47905 97 19.5
UVW1 47149 964 20.3
UVM2 39328 1190 20.5
UVW2 53182 1800 20.5
-----------------------------------------------------------------
where T_mid is the weighted mid time of the coadded exposure. The values
quoted above are not corrected for the expected Galactic extinction
corresponding to a reddening of E_{B-V} = 0.08 mag in the direction of the
burst (Schlegel et al. 1998).