GCN Circular 24817
Subject
GRB 190613B: Swift/UVOT Detection
Date
2019-06-13T17:39:39Z (5 years ago)
From
Frank Marshall at Swift/UVOT <marshall@milkyway.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190613B
106 s after the BAT trigger (D'Ai et al., GCN Circ. 24807).
A source consistent with the enhanced XRT position
(Beardmore et al. GCN Circ. 24812)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 20:21:43.66 = 305.43191 (deg.)
Dec (J2000) = -04:38:48.0 = -4.64666 (deg.)
with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).
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
white 106 256 147 17.84 +/- 0.04
v 648 667 19 >18.0
b 574 594 19 >18.7
u 318 568 246 18.86 +/- 0.12
w1 697 717 19 >18.6
m2 672 692 19 >18.4
w2 624 643 19 >18.8
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).