[vsnet-grb-info 9307] Swift/UVOT observations of GRB100522A.
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sun May 23 08:39:00 JST 2010
TITLE: GCN CIRCULAR
NUMBER: 10791
SUBJECT: Swift/UVOT observations of GRB100522A.
DATE: 10/05/22 23:38:54 GMT
FROM: Massimiliano de Pasquale at MSSL-UCL <mdp at mssl.ucl.ac.uk>
M. De Pasquale (MSS-UCL) and Eleonora Troja (NASA/GSFC/ORAU)
report on behalf of the Swift/UVOT team:
Swift/UVOT began settled observations of GRB100522A (Troja et al.
GCN Circ. 10784) starting 73 seconds after trigger. No optical afterglow
within the enhanced XRT position (Osborne et al. GCN Circ. 10787) is
detected in the UVOT exposures. Preliminary 3-sigma upper limits using
the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for
the first finding chart (FC) exposure and subsequent summed exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
-----------------------------------------------------------
white 73 223 147 >20.1 (FC)
white 73 7223 569 >20.9
v 614 6199 352 >19.0
b 541 7018 352 >19.9
u 285 13630 1243 >20.1
uw1 663 12939 1242 >20.5
m2 639 7838 549 >20.2
w2 590 7429 363 >20.1
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.06 in the direction of the burst
(Schlegel et al. 1998).
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