GCN Circular 14063
Subject
GRB 121211A: Swift/UVOT Detection
Date
2012-12-12T03:15:42Z (12 years ago)
From
Margaret Chester at PSU <chester@astro.psu.edu>
M. M. Chester (PSU) and V. Mangano (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 121211A
97 s after the BAT trigger (Mangano et al., GCN Circ. 14057). A source
consistent with the enhanced Swift-XRT position (Osborne et al. GCN
Circ.
14060) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 13:02:07.99 = 195.53328 (deg.)
Dec (J2000) = +30:08:54.6 = 30.14849 (deg.)
with an estimated uncertainty of 0.52 arc sec. (radius, 90% confidence).
The following table provides preliminary detections and 3-sigma upper
limits for the finding charts and summed exposures using the UVOT
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373).
The lack of a detection in uvw2 is consistent with the redshift of
1.023 reported by Perley et al. (GCN Circ. 14059).
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 97 247 147 18.4 +/- 0.1
white 4103 5738 393 19.9 +/- 0.1
v 4514 6148 393 >19.9
b 3899 5533 393 20.4 +/- 0.2
u_FC 255 297 41 18.3 +/- 0.3
u 5128 5328 197 19.6 +/- 0.2
w1 10576 11476 886 20.6 +/- 0.2
m2 4718 10569 1082 20.6 +/- 0.2
w2 4309 5943 393 >21.1
The magnitudes in the table are not corrected for the Galactic
extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).