[vsnet-grb-info 13057] GRB 130418A: T18 and T21 optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Apr 20 00:49:26 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 14394
SUBJECT: GRB 130418A: T18 and T21 optical observations
DATE: 13/04/19 15:49:18 GMT
FROM: Veli-Pekka Hentunen at Taurus Hill Obs,A95 <veli-pekka.hentunen at kassiopeia.net>
Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill
Observatory, Varkaus, Finland) report:
We have detected GRB 130418A optical afterglow at iTelescope observatories
T18 and T21. Four unfiltered and three photometric V filter images with 300 sec exposure time were made at T18 (AstroCamp Observatory, Nerpio, Spain) 0.32-m/8.0 Astorgraph and KAF-6303E CCD. Two unfiltered and four photometric V filter images with 600 sec exposure time were made at T21 (Mayhill, New Mexico) 0.43-m/6.8 astrograph and FLI ProLine PL6303E CCD.
The afterglow was detected at following position RA 09:56:08.94 and DEC +13:40:02.9.
The following magnitudes were obtained from the observations using
NOMAD1 1036-0179295 (V= 14.750, R = 14.910) as the comparison:
Tmid(sec) +T0 Filter Exp time Mag Mag err.
3119 unfiltered 300 16.200CR 0.026
3406 unfiltered 300 16.305CR 0.027
3758 unfiltered 300 16.381CR 0.027
4118 unfiltered 300 16.496CR 0.030
4835 V 300 16.895V 0.082
5195 V 300 16.979V 0.081
5546 V 300 16.983V 0.085
6432 V 600 17.320V 0.075
7093 V 600 17.342V 0.077
8026 unfiltered 600 17.328CR 0.044
8691 unfiltered 600 17.519CR 0.053
9742 V 600 17.775V 0.123
11059 V 600 17.752V 0.193
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