GCN Circular 28281
Subject
GRB 200819A: Swift/UVOT Upper Limits
Date
2020-08-21T20:55:50Z (4 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (PSU) and S. Dichiara (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200819A
89 s after the BAT trigger (Dichiara et al., GCN Circ. 28263).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 28265)
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_FC 89 239 147 >20.4
u_FC 301 551 246 >19.0
white 89 601 167 >20.3
b 557 577 19 >17.7
u 301 551 246 >19.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.59 in the direction of the burst
(Schlegel et al. 1998).