GCN Circular 26053
Subject
GRB 191019A: Swift/UVOT Detection
Event
Date
2019-10-21T22:05:22Z (6 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 191019A: Swift/UVOT Detection
S. J. LaPorte (PSU) and K. K. Simpson (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 191019A
3294 s after the BAT trigger (Simpson et al., GCN Circ. 26031).
A fading source consistent with the XRT position
(Evans et al. GCN Circ. 26034)
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 4541 4741 196
19.55+-0.30
uvm2 5361 5561 196 >19.20
u 4336 4536 196 >19.43
v 5156 5356 196 >18.75
uvw1 4131 4331 196 >19.13
uvw2 4952 5151 196 >19.28
white 4746 4946 196 19.66+-0.20
white 27982 28668 668 20.27+-0.18
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998). Additionally, these magnitudes likely include a
contribution
from the probable host-galaxy, as reported by TSHAO (Reva et al., GCN Circ.
26036),
NOT (Fynbo et al., GCN Circ. 26041), and GROND (Guelbenzu et al. GCN Circ.
26042).