[vsnet-grb-info 22604] GRB 190530A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Jun 1 12:11:57 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 24703
SUBJECT: GRB 190530A: Swift/UVOT Detection
DATE: 19/06/01 03:10:41 GMT
FROM: Mike Siegel at PSU/Swift MOC <mhs18 at psu.edu>
M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190530A
33.8 ks after the LAT trigger (GCN Circ. 24676). A fading source consistent
with the optical counterpart first reported by Lipunov et al. (GCN Circ.
24680) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 08:02:07.70 = 120.53209 (deg.)
Dec (J2000) = +35:28:46.8 = 35.47968 (deg.)
with an estimated uncertainty of 0.49 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
v 56532 56734 199 18.49 +/- 0.23
b 38334 38490 153 18.06 +/- 0.09
u 38132 38329 194 17.09 +/- 0.06
w1 37734 38128 388 16.89 +/- 0.06
w2 44276 44610 329 17.39 +/- 0.08
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).
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