GCN Circular 33733
Subject
GRB 230506B: Swift/UVOT Detection
Event
Date
2023-05-06T21:37:07Z (3 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
Paul Kuin (MSSL/UCL) and Simone Dichiara(PSU) report on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 230506B
114 s after the BAT trigger (Dichiara et al., GCN Circ. 33727).
A candidate afterglow consistent with the XRT position 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 113 271 147 20.19 +/- 0.24
white 614 807 38 >19.8
u 334 583 247 >19.9
u 10511 11899 738 20.66 +/- 0.30
b 589 783 39 >19.1
uvw1 714 734 20 >17.6
uvm2 688 708 20 >17.2
uvw2 639 658 20 >19.6
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.293 in the direction of the burst
(Schlegel et al. 1998).
[GCN OPS NOTE: Corrected title from 230606B to 230506B at author's request.]