[vsnet-grb-info 7978] Optical observations of GRB 090618
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Jun 18 21:38:48 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 9519
SUBJECT: Optical observations of GRB 090618
DATE: 09/06/18 12:37:13 GMT
FROM: Alberto Carraminana at AzTEC <alberto at inaoep.mx>
A. Carraminana (INAOE), C. Alvarez Ochoa (UNACh)
and G. Miramon (OAGH-INAOE) report:
We clearly detected the optical counterpart of GRB 090618 (GCN 9512)
with the 2.1m telescope of the Observatorio Astrofisico
Guillermo Haro at Cananea, Sonora, Mexico. Observations started
at 08:43 UT, 14 minutes after the BAT trigger and continued
until dawn. Observations were made under non photometric conditions.
We measured a lineal faddening of the burst compared to
a reference star of amplitude 0.5 magnitudes between t=870s
to 1600s. A non calibrated graph is available at
http://www.inaoep.mx/~alberto/gamma/grb090618_lc.jpg
Spectroscopic data were also obtained and are under analysis.
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