[vsnet-grb-info 9990] GRB101204A: Swift/UVOT observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Dec 10 04:11:43 JST 2010
TITLE: GCN CIRCULAR
NUMBER: 11447
SUBJECT: GRB101204A: Swift/UVOT observations
DATE: 10/12/09 19:11:39 GMT
FROM: Samantha Oates at MSSL <sro at mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) & B. Sbarufatti (INAF-OAB/IASFPA) report
on behalf of the Swift-XRT and Swift-UVOT teams
The Swift/UVOT began settled observations of the field of GRB 101204A
126195 s after the BAT trigger (Cummings et al., GCN Circ. 11440).
In agreement with report from Nicuesa Guelbenzu et al., (GCN Circ.
11445), we
find the afterglow candidate in (Sbarufatti et al. GCN Circ. 11442)
to have faded. Preliminary magnitudes using the UVOT photometric
system (Poole et al. 2008, MNRAS, 383, 627) for summed exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
#####################################################
v 126195 133279 2563 20.51 +/- 0.19
v 271960 336155 3553 > 21.62
u 127505 134378 2329 20.03 +/- 0.12
u 272471 336626 3273 21.27 +/- 0.26
#####################################################
The values quoted above 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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