GCN Circular 34643
Subject
GRB 230906A: Swift/UVOT Upper Limits
Date
2023-09-09T10:53:16Z (8 months ago)
From
Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>
Via
email
S. R. Oates (Lancaster U. ) and M. J. Moss (GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 230906A
93 ks after IPN-detection (Kozyrev et al., GCN Circ 34637). No optical
afterglow consistent with the XRT position (Beardmore et al., GCN
Circulars 34639), is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 93297 106009 4648 >22.8
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.021 in the direction of the burst
(Schlegel et al. 1998).