GCN Circular 27165
Subject
GRB 200219A: UVOT Upper Limits
Event
Date
2020-02-21T18:02:34Z (6 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (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 200219A
75 s after the BAT trigger (Lien et al., GCN Circ. 27125).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 27138)
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 75 225 147 >20.2
u_FC 287 537 246 >19.3
white 75 19365 1139 >21.2
v 617 30839 1770 >19.7
b 543 36572 2257 >20.9
u 287 25105 2431 >20.7
w1 666 40797 1248 >20.4
m2 641 40734 2104 >20.4
w2 592 28878 914 >20.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).