[vsnet-grb-info 22469] GRB 190515B: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri May 17 12:46:52 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 24568
SUBJECT: GRB 190515B: Swift/UVOT Upper Limits
DATE: 19/05/17 03:44:52 GMT
FROM: Mike Siegel at PSU/Swift MOC <mhs18 at 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).
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