GCN Circular 20306
Subject
GRB 161219B: Swift/UVOT Detection
Event
Date
2016-12-20T17:08:41Z (9 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.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 161219B
112 s after the BAT trigger (D'Ai et al., GCN Circ. 20296).
A source consistent with the XRT position
(Beardmore et al. GCN Circ. 20297)
is detected in the initial UVOT exposures.
The source is detected in the first white exposure at the position:
RA(J2000) = 06:06:51.43 = 91.71428
DEC(J2000) = -26:47:29.5 = -26.79152
with an uncertainty of 0.42" (90% confidence)
Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are
in the table below. Fading is seen in all filters.
The detection in the w2 filter is consistent
with a relatively low redshift as suggested by
Kruehler et al. (GCN Circ. 20299).
Filter T_start(s) T_stop(s) Exp(s) Mag
white 112 261 147 16.1 +/- 0.1
v 653 673 19 16.7 +/- 0.2
b 579 599 20 16.9 +/- 0.1
u 324 573 246 16.0 +/- 0.1
u 44962 45868 875 18.0 +/- 0.1
w1 702 722 20 15.6 +/- 0.1
m2 677 697 19 15.7 +/- 0.2
w2 629 649 20 15.9 +/- 0.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst.