[vsnet-grb-info 27527] GRB 210308A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Mar 9 10:16:57 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 29630
SUBJECT: GRB 210308A: Swift/UVOT Detection
DATE: 21/03/09 01:16:01 GMT
FROM: Sam LaPorte at PSU <sjl5346 at psu.edu>
GRB 210308A: Swift/UVOT Detection
J. D. Gropp (PSU) and V. D'Elia (SSDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210308A
95 s after the BAT trigger (D'Elia et al., GCN Circ. 29619).
A source consistent with the XRT position
(D'Elia et al., GCN Circ. 29619)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 04:28:17.73 = 67.07389 (deg.)
Dec (J2000) = +37:26:02.1 = 37.43391 (deg.)
with an estimated uncertainty of 0.46 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
b 765 1189 38 >18.62
uvm2 864 1115 38 >17.52
u 338 1164 284 >19.50
v 667 1090 58 >17.84
uvw1 1120 1140 19 >17.25
uvw2 815 1231 50 >17.91
white 126 275 292
18.54+-0.07
white 618 1213 205 >20.20
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.296 in the direction of the burst
(Schlegel et al. 1998).
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