GCN Circular 31222
Subject
GRB 211211A: Swift/UVOT detection
Date
2021-12-12T18:19:57Z (2 years ago)
From
Alexander Belles at PSU/Swift <aub1461@psu.edu>
A. Belles (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 211211A
92 s after the BAT trigger (D'Ai et al., GCN Circ. 31202).
A fading source consistent with the XRT position
(Beardmore et al. GCN Circ. 31205) and optical position
(Zheng & Filippenko, GCN Circ. 31203) is detected in the initial
UVOT exposures.
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
wh_FC 92 242 147 18.93+/-0.22
wh 3906 4106 196 18.33+/-0.09
wh 68215 68397 179 >19.74
b 3701 3901 196 18.97+/-0.28
b 16837 17437 587 19.27+/-0.28
b 67303 68210 885 19.70+/-0.24
v 4317 4517 196 >18.33
u 3496 5012 275 18.26+/-0.16
u 15924 16831 885 18.44+/-0.11
u 57177 74247 362 >18.89
w1 4727 4927 196 17.46+/-0.16
m2 4522 4721 196 17.58+/-0.19
m2 21678 22153 467 18.18+/-0.18
w2 4112 4312 196 17.30+/-0.15
w2 61756 62656 885 18.94+/-0.24
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.018 in the direction of the burst
(Schlegel et al. 1998).