[vsnet-grb-info 5684] UVOT analysis for GRB080229
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Mar 1 09:34:26 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 7339
SUBJECT: UVOT analysis for GRB080229
DATE: 08/03/01 00:34:09 GMT
FROM: Paul Kuin at MSSL <npkuin at googlemail.com>
N.P.M. Kuin (MSSL/UCL) and J. K. Cannizzo (NASA/UMBC) report on
behalf of the Swift-UVOT team:
The Swift/UVOT observed the field of GRB 080229 (trigger #304379),
Canizzo et al. GCN CIRC. 7335) starting 2008:02:29 at 17:06:22 UT
with a 9.4 s setling image followed at 17:06:41 UT with a finding
chart. No afterglow is detected at the position of the enhanced
XRT position in the finding chart, nor in the three subsequent
exposures.
The source is near a bright star and may be affected by it.
Therefore a small aperture was used and the background was determined
for a region at equal distance to the nearby star.
The following 3-sigma upper limits (in the UVOT photometric system,
Breeveld et al., GCN Circ. 6614) were determined at the XRT
position (RA=15:12:52.53, DEC= -14:42:19.3, J2000):
Filter Tstart(s) Tstop(s) Exp(s) Mag (3-sigma Upper Limits)
wh 101 200 99.8 > 20.9
v 208 608 400.0 > 19.9
wh 856 956 99.8 > 20.9
v 962 1362 400.0 > 19.9
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.15 mag in the
direction of the burst (Schlegel et al. 1998).
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