GCN Circular 26919
Subject
GRB 200127A: Swift/UVOT Upper Limits
Date
2020-01-28T19:11:13Z (4 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
A. Belles (PSU) and M. J. Moss (GWU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200127A
150 s after the BAT trigger (Moss et al., GCN Circ. 26895).
No optical afterglow consistent with the XRT position (Evans et al.,
GCN Circ. 26902) 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 150 300 147 >20.4
u_FC 310 560 246 >19.4
white 150 11742 1368 >22.3
v 640 16568 1317 >20.2
b 566 10830 1121 >21.3
u 310 6701 638 >20.2
w1 690 18173 1095 >21.1
m2 838 17473 1298 >20.6
w2 615 12437 1110 >20.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.16 in the direction of the burst
(Schlegel et al. 1998).