[vsnet-grb-info 21685] GRB 190123A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Jan 24 23:46:08 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 23784
SUBJECT: GRB 190123A: Swift/UVOT Upper Limits
DATE: 19/01/24 14:44:09 GMT
FROM: Mike Siegel at PSU/Swift MOC <mhs18 at 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).
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