GCN Circular 6701
Subject
GRB070802: Swift/UVOT upper limits
Date
2007-08-02T19:10:36Z (17 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
N.P.M. Kuin (MSSL) and S. Immler (GSFC)������������� �
report on behalf of the Swift-UVOT team:
The Swift/UVOT observed the field of GRB070802 (trigger=286809)
starting 2007-08-02 at 07:09:30, 125 s after the BAT trigger (Barthelmy
et al. 2007, GCN Circ.6692). We do not find a new source in the UVOT
observations at the location of the refined XRT position (Evans and
Mangano, 2007, GCN Circ. 6697).
The 3-sigma upper limits (in the UVOT photometric system, Breeveld et
al., GCN Circ. 6614) for detecting a source inside the XRT error circle
in the co-added frames (including the settling exposure and finding
charts) are listed below:
Filter Tstart Tstop Exposure Magnitude
(s) (s) (s) (3-sigma UL)
white 142 16875 589.9 >21.25
v 125 12514 773.2 >19.96
uvm2 654 4821 239.4 >19.84
uvw1 679 4969 182.3 >19.77
u 703 6307 219.6 >19.52
b 728 16681 1109.0 >21.27
uvw2 758 10893 1127.5 >21.16
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.026 mag in the
direction of the burst (Schlegel et al. 1998).