GCN Circular 34135
Subject
GRB 230628E: Swift/UVOT Detection
Date
2023-07-02T18:36:09Z (10 months ago)
From
Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>
S. R. Oates (U. Birmingham) and N. Klingler (NASA-GSFC/UMBC/CRESST II)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 230628E
221 s after the BAT trigger (Klingler et al., GCN Circ. 34110).
A source consistent with the XRT position (Page et al., GCN Circ. 34116)
and the optical position (Malesani et al., GCN Circ. 34118)
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
white (FC) 221 371 167 20.10 +/- 0.20
wh 501 1194 223 20.69 +/- 0.34
v 379 1243 68 >19.1
b 477 1170 78 >19.9
u 452 1145 78 >19.6
w1 428 1120 78 >19.4
m2 1249 1269 19 >18.2
w2 700 720 19 >18.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.040 in the direction of the burst
(Schlegel et al. 1998).