[vsnet-grb-info 12209] GRB 120805A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Aug 7 04:09:18 JST 2012
TITLE: GCN CIRCULAR
NUMBER: 13598
SUBJECT: GRB 120805A: Swift/UVOT Upper Limits
DATE: 12/08/06 19:09:10 GMT
FROM: Craig Swenson at PSU/Swift <cswenson at astro.psu.edu>
C. A. Swenson (PSU) and E. Troja (NASA/GSFC/ORAU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120805A
127 s after the BAT trigger (Troja et al., GCN Circ. 13588).
No optical afterglow consistent with the refined XRT position (Burrows
et al., GCN Circ. 13592) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial
exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 127 7557 579 >22.0
v 1339 11924 1248 >20.8
b 1265 7352 490 >21.5
u 1240 7146 490 >20.5
w1 1216 13611 1253 >21.3
m2 1364 12829 1141 >21.6
w2 1487 7763 432 >21.6
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).
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