GCN Circular 22758
Subject
GRB 180602A: Swift/UVOT Upper Limits
Date
2018-06-03T17:11:58Z (6 years ago)
From
Jeffrey Gropp at PSU <jdg44@psu.edu>
J. Gropp (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180602A
133 s after the BAT trigger (Cenko et al., GCN Circ. 22752).
No optical afterglow consistent with the enhanced XRT position
(Osborne et al. GCN Circ. 22753)
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 133 283 147 >19.9
u_FC 291 541 246 >19.8
white 133 1715 411 >20.8
v 621 2283 194 >19.0
b 547 2208 175 >20.0
u 291 2183 401 >20.3
w1 670 2159 175 >20.0
m2 645 665 19 >18.7
w2 597 2086 136 >20.4
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).