GCN Circular 33642
Subject
GRB 230414B: Swift/UVOT Detection
Date
2023-04-18T17:05:38Z (2 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 230414B: Swift/UVOT Detection
S. J. LaPorte (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 230414B
133 s after the BAT trigger (D'Ai et al., GCN Circ. 33612).
A fading source consistent with the optical position
(Pankov et al. GCN Circ. 33615)
is detected in the initial UVOT exposures.
Preliminary detections and 3-sigma upper limits using the UVOT photometric
system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures
are:
Filter T_start(s) T_stop(s) Exp(s) Mag
b 543 735 38 >19.23
m2 1070 1089 19 >17.31
u 287 710 265 >20.09
v 617 1065 58 >18.53
w1 666 859 38 >18.48
w2 766 785 19 >17.72
white_FC 129 1015 481 20.92+-0.22
white 5056 5203 145 >20.64
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.017 in the direction of the burst
(Schlegel et al. 1998).