[vsnet-grb-info 4810] Swift/UVOT observations of GRB070616
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sun Jun 17 11:38:50 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6546
SUBJECT: Swift/UVOT observations of GRB070616
DATE: 07/06/17 02:38:44 GMT
FROM: Massimiliano de Pasquale at MSSL-UCL <mdp at mssl.ucl.ac.uk>
M. De Pasquale (MSSL/UCL), R. Starling (Univ. Leicester)
and P. Schady (MSSL/UCL) report, on the behalf ot the Swift
UVOT team:
The Swift UVOT telescope began its White filter finding
chart exposure of GRB070616 (Starling et al., GCN circ 6542)
144 seconds after the trigger. The XRT position lies on
a bright object, listed in the USNO-B1.0 catalogue, therefore
we caution that this source strongly affects the photometry.
In the XRT error circle we do not detect any optical
afterglow. We derive the following 3 sigma upper limits:
Filter Time after trigger (s) Exposure (s) 3s U.L.
White 144-243 98 18.3
V 250-649 390 18.1
White 144-979 209 18.6
V 250-1122 547 18.3
B 729-738 10 17.1
U 707-874 39 17.2
UW1 680-850 39 17.1
UM2 655-825 39 17.3
UW2 758-777 20 17.0
No correction has been made for the high Galactic
reddening of E(B-V)=0.4. We note that this value should
be taken with caution, having the burst occurred at low
Galactic latitude.
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