[vsnet-grb-info 27200] GRB 210112A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Jan 15 12:51:46 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 29303
SUBJECT: GRB 210112A: Swift/UVOT Detection
DATE: 21/01/15 03:50:43 GMT
FROM: Mike Siegel at PSU/Swift MOC <mhs18 at psu.edu>
M. H. Siegel (PSU) and Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210112A
83 s after the BAT trigger (Ambrosi et al., GCN Circ. 29289).
A source consistent with the XRT position
(Goad et al. GCN Circ. 29290)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 14:36:01.49 = 219.00619 (deg.)
Dec (J2000) = +33:03:15.3 = 33.05424 (deg.)
with an estimated uncertainty of 0.50 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 83 233 147 19.54 +/- 0.10
v 626 1419 97 >18.5
b 551 1517 97 >19.1
u 296 1493 304 >20.2
w1 675 1468 78 >19.1
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.014 in the direction of the burst
(Schlegel et al. 1998).
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