[vsnet-grb-info 25669] GRB 200519A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu May 21 04:11:17 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 27769
SUBJECT: GRB 200519A: Swift/UVOT Detection
DATE: 20/05/20 19:09:27 GMT
FROM: Mike Siegel at PSU/Swift MOC <mhs18 at psu.edu>
M. H. Siegel (PSU) and B. Sbarufatti (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200519A
58 s after the BAT trigger (Sbarufatti et al., GCN Circ. 27756).
A source consistent with the XRT position
(Sbarufatti et al. GCN Circ. 27756)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 17:01:20.01 = 255.33337 (deg.)
Dec (J2000) = -30:22:41.1 = -30.37808 (deg.)
with an estimated uncertainty of 0.42 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 58 208 147 15.43 +/- 0.02
v 599 619 20 16.30 +/- 0.16
b 525 545 19 17.13 +/- 0.13
u 270 519 246 16.27 +/- 0.04
w1 648 840 39 17.46 +/- 0.25
w2 747 766 19 >17.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.47 in the direction of the burst
(Schlegel et al. 1998).
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