GCN Circular 30619
Subject
GRB 210807C: Swift/UVOT Upper Limits
Event
Date
2021-08-08T21:44:40Z (5 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 210807C: Swift/UVOT Upper Limits
S. J. LaPorte (PSU) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210807C
180 s after the BAT trigger (Lien et al., GCN Circ. 30610).
No optical afterglow consistent with the XRT position
(Lien et al. GCN Circ. 30610)
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
v 180 852 596 >19.4
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 3.076 in the direction of the burst
(Schlegel et al. 1998).