[vsnet-grb-info 13047] GRB 130418A: Swift/UVOT Detection and request for continuing coverage
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Apr 19 10:19:45 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 14384
SUBJECT: GRB 130418A: Swift/UVOT Detection and request for continuing coverage
DATE: 13/04/19 01:19:37 GMT
FROM: Paul Kuin at MSSL <npkuin at gmail.com>
N. P. M. Kuin and M. De_Paquale (UCL-MSSL) report on behalf of
the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130418A
138 s after the BAT trigger (De_Paquale et al., GCN Circ. 14377).
A source consistent with the XRT position (De Pasquale et al.
GCN Circ. 14377) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 09:56:08.88 = 149.03700 (deg.)
Dec (J2000) = +13:40:02.7 = 13.66741 (deg.)
with an estimated uncertainty of 0.50 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 138 288 146 14.85 +/- 0.05
u 296 353 56 14.71 +/- 0.04
v 5634 5834 197 17.69 +/- 0.08
b 3567 3766 197 17.41 +/- 0.05
w1 6044 6124 78 17.25 +/- 0.11
m2 5839 6039 197 17.61 +/- 0.11
w2 5430 5630 197 18.08 +/- 0.11
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
(Schlegel et al. 1998).
Due to a Moon constraint, Swift observations will stop for now. Continuing
aquisition of ground-based data, including ubv photometry will be useful
at this time.
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