[vsnet-grb-info 20261] GRB 180115A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Jan 17 05:27:06 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 22357
SUBJECT: GRB 180115A: Swift/UVOT Detection
DATE: 18/01/16 20:26:27 GMT
FROM: Frank Marshall at Swift/UVOT <marshall at milkyway.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and J. K. Cannizzo (NASA/UMBC)
report on behalf of the Swift/UVOT team:
Additional observations of the optical afterglow of GRB 180115A
discovered with Swift/UVOT (Cannizzo et al., GCN Circ. 22335)
reveal an initially brightening and then fading source.
The source is not detected in any of the UV filters, consistent
with the redshift of 2.487 reported by de Ugarte Postigo et al. (GCN Circ. 22346).
The preliminary UVOT position is:
RA (J2000) = 00:48:09.27 = 12.03862 (deg.)
Dec (J2000) = -15:37:49.9 = -15.63054 (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 140 290 147 17.61 +/- 0.04
white 753 773 20 16.95 +/- 0.07
white 5663 5863 197 19.18 +/- 0.08
v 628 648 20 16.50 +/- 0.16
b 554 574 20 16.93 +/- 0.11
u 299 548 246 16.32 +/- 0.04
w1 1109 13068 1165 >20.7
m2 4743 12296 1279 >21.8
w2 5769 7329 318 >20.2
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).
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