GCN Circular 23784
Subject
GRB 190123A: Swift/UVOT Upper Limits
Date
2019-01-24T14:44:09Z (5 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190123A
124 s after the BAT trigger (D'Ai et al., GCN Circ. 23769).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 23771)
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 124 250 123 >20.3
white 124 10248 1258 >22.0
v 3470 11721 947 >20.3
b 4290 5926 393 >21.1
u 4085 5721 393 >21.0
w1 3880 5516 393 >20.1
m2 3675 5310 393 >19.9
w2 4701 11151 1079 >21.1
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.44 in the direction of the burst
(Schlegel et al. 1998).