GCN Circular 24568
Subject
GRB 190515B: Swift/UVOT Upper Limits
Date
2019-05-17T03:44:52Z (5 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (PSU) and M. J. Moss (George Washington University)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190515B
93 s after the BAT trigger (Moss et al., GCN Circ. 24553).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 24557)
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 93 242 147 >19.9
u_FC 305 555 246 >19.4
white 93 605 167 >20.0
v 636 4442 216 >18.9
b 561 754 39 >18.7
u 305 730 265 >19.5
w1 685 4722 88 >18.9
m2 661 4647 216 >19.6
w2 612 4237 216 >19.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.09 in the direction of the burst
(Schlegel et al. 1998).