GCN Circular 25972
Subject
GRB 191004A: Swift/UVOT Detection
Event
Date
2019-10-07T17:39:25Z (7 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 191004A: Swift/UVOT Detection
S. J. LaPorte (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 191004A
84 s after the BAT trigger (Cenko et al., GCN Circ. 25945).
A fading source consistent with the XRT position
(Osborne et al. GCN Circ. 25950)
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
b 582 775 38 >18.83
uvm2 680 873 38 >18.00
u 327 750 265 >19.60
v 656 1104 58 >18.06
uvw1 705 898 38 >17.89
uvw2 632 1080 58 >18.28
white 115 1054 333 19.78+-0.16
white 5567 12438 956 >21.24
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).