[vsnet-grb-info 3707] GRB060904b optical detections (delayed report
due to internet outage)
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Sep 7 11:58:48 JST 2006
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 5541
SUBJECT: GRB060904b optical detections (delayed report due to internet outage)
DATE: 06/09/07 02:58:40 GMT
FROM: Gottfried Kanbach at MPE <gok at mpe.mpg.de>
N.Prymak, G. Kanbach, H. Steinle, A. Stefanescu, S. Duscha, F. Schrey,
M. Muehlegger (MPE Garching) of the
OPTIMA-Burst Team report on optical observations of GRB060904b (BAT
trigger Nr. : 228006; Circ.Nr. 5505, Grupe et al.):
OPTIMA-Burst at the 1.3m Skinakas Observatory, of the University of
Crete, Greece, observed the Swift/UVOT 0.5"-errorcircle of GRB060904b
(GCN Circ. 5519, Oats et al.) on 2006 Sept. 04.
Relative photometry to several close-by USNO catalog stars (referenced
by their R magnitude) was performed for the
detected optical transient in our unfiltered images of 25 second
exposure each. Results are listed:
2006/Sept/04 post-BAT
start time(UT) time(s) R magnitude
02:39:25 502 16.90+-0.12
02:41:56 653 17.09+-0.16
02:44:00 777 17.24+-0.19
02:45:52 889 17.36+-0.17
02:47:47 1004 17.44+-0.14
02:48:56 1073 17.58+-0.14
02:55:29 1466 17.70+-0.22
02:56:01 1505 17.75+-0.20
02:58:52 1669 17.94+-0.18
03:00:14 1751 17.79+-0.21
03:01:05 1802 17.89+-0.14
Sorry for the delay, we didn't have Internet connection from Sept 2.5 to
6.7.
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