GCN Circular 17820
Subject
GRB 150514A: Swift/UVOT Detection
Date
2015-05-15T13:50:53Z (10 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and J. K. Cannizzo (GSFC/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150514A
40750 s after the LAT trigger (Kocevski and Arimoto, GCN Circ. 17816).
A source consistent with the XRT position (Kennea et al. GCN Circ. 17818)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 04:59:30.30 = 74.87623 (deg.)
Dec (J2000) = -60:58:06.3 = -60.96841 (deg.)
with an estimated uncertainty of 0.43 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
white 41402 41850 440 18.60 +/- 0.04
v 42049 42222 170 18.71 +/- 0.20
u 40750 41396 636 18.20 +/- 0.05
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).