GCN Circular 29177
Subject
GRB 201223A: Swift/UVOT Detection
Event
Date
2020-12-26T22:03:09Z (5 years ago)
From
Alexander Belles at PSU/Swift <aub1461@psu.edu>
���A. Belles (PSU) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 201223A
79 s after the BAT trigger (Gropp et al., GCN Circ. 29158).
A source consistent with the XRT position (Goad et al., GCN Circ. 29170)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 08:51:09.51 = 132.78961 (deg.)
Dec (J2000) = +71:10:47.4 = 71.17984 (deg.)
with an estimated uncertainty of 0.42 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_FC 79 229 147 16.06+/-0.03
white 571 1019 186 18.04+/-0.08
white 5921 6121 196 >20.17
white 12121 12630 497 20.09+/-0.30
v 621 1069 58 >17.44
b 547 1167 58 17.97+/-0.25
b 11208 12115 885 >20.38
u_FC 292 541 246 16.75 +/- 0.04
u 694 1142 38 >17.58
w1 670 1118 58 >17.65
m2 645 1093 58 >17.87
w2 596 1045 58 >17.81
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).