GCN Circular 33370
Subject
GRB 230217A: Swift/UVOT Upper Limits
Date
2023-02-22T21:02:57Z (a year ago)
From
Alexander Belles at PSU/Swift <aub1461@psu.edu>
The Swift/UVOT began settled observations of the field of GRB 230217A
45.8 ks after the Swift/BAT trigger (Moss et al., GCN Circ. 33339).
No optical afterglow consistent with the XRT position
(Capalbi et al., GCN Circ. 33365) 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 initial exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
wh 45886 84347 2643 >21.37
u 329962 342875 4884 >20.78
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.15 in the direction of the burst
(Schlegel et al. 1998).