GCN Circular 32785
Subject
GRB 221016A: Swift/UVOT Detection
Event
Date
2022-10-17T20:13:01Z (3 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (PSU) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 221016A
97 s after the BAT trigger (Page et al., GCN Circ. 32774).
A source consistent with the enhanced XRT position (Goad et al. GCN Circ. 32776)
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 97 247 147 20.20 +/- 0.23
b 3736 3861 123 >19.8
u 309 349 39 >18.8
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.026 in the direction of the burst
(Schlegel et al. 1998).