GCN Circular 21118
Subject
GRB170519A, Swift-UVOT Detection
Date
2017-05-19T23:24:09Z (7 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 170519A: Swift/UVOT Detection
S. J. LaPorte (PSU) and T. N. Ukwatta (LANL)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170519A
93 s after the BAT trigger (Ukwatta et al., GCN Circ. 21106).
A fading source consistent with the XRT position
(Beardmore et al. GCN Circ. 21107)
is detected in all initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 10:53:42.45 = 163.42688 (deg.)
Dec (J2000) = +25:22:27.5 = 25.37431 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections 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
white 5315 5515 196 17.22+-0.03
white 582 773 38 16.25+-0.04
white 89 239 147 16.91+-0.03
v 68 5926 421 17.46+-0.08
b 557 6594 282 17.66+-0.05
u 302 552 245 16.00+-0.04
uvw1 680 6337 412 16.76+-0.05
uvm2 5932 6131 196 17.13+-0.11
uvw2 607 627 19 16.45+-0.20
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst