[vsnet-grb-info 12710] GRB121212A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Dec 13 02:15:07 JST 2012
TITLE: GCN CIRCULAR
NUMBER: 14069
SUBJECT: GRB121212A: Swift/UVOT Detection
DATE: 12/12/12 17:14:59 GMT
FROM: Paul Kuin at MSSL <npkuin at gmail.com>
N.P.M. Kuin (MSSL-UCL) and D. Grupe (PSU) report on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 121212A
72 s after the BAT trigger (Grupe et al., GCN Circ. 14064). A source
consistent with the enhanced XRT position (Beardmore et al. GCN Circ.
14066) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 11:51:10.30 = 177.79292 (deg.)
Dec (J2000) = +78:02:14.3 = 78.03730 (deg.)
with an estimated uncertainty of 0.62 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric
system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early
exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 72 7133 824 21.23 +/- 0.17
v 615 6108 352 >20.3
b 540 13527 1160 >20.9
u 285 1138 285 20.25 +/- 0.25
w1 664 11960 1238 >20.8
m2 639 6313 216 >20.5
w2 763 5904 255 >20.9
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).
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