[vsnet-grb-info 4012] GRB 061121: Faulkes Telescope North Optical
Observation
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Nov 22 01:38:27 JST 2006
TITLE: GCN CIRCULAR
NUMBER: 5827
SUBJECT: GRB 061121: Faulkes Telescope North Optical Observation
DATE: 06/11/21 16:38:21 GMT
FROM: Andrea Melandri at Liverpool John Moores U <axm at astro.livjm.ac.uk>
A. Melandri (Liverpool JMU), C. Guidorzi (Univ Bicocca & INAF-OAB),
C.G. Mundell, I.A. Steele, R.J. Smith, A. Monfardini, D. Carter,
S. Kobayashi, D. Bersier, M. Bode (Liverpool JMU), A. Gomboc
(University of Ljubljana), P. O'Brien, E. Rol, N. Bannister (Leicester)
report:
The 2-m Faulkes North Telescope (Hawaii) automatically reacted to the
Swift burst GRB061121 (trigger=239899, Page et al. GCN 5823).
Observations started about 4.4 min after the trigger time. We confirm
the detection of the optical counterpart at the position
RA(J2000) = 09:48:54.58
Dec(J2000) = -13:11:42.8
0.6" uncertainty, coincident with the UVOT and ROTSE counterpart
(Yost et al. GCN 5824).
The automatic pipeline LT-TRAP identified a fading afterglow in BVRi'
filters, and we estimate an initial magnitude R = 16.7 +/- 0.3
(wrt USNOB) at t=4.4min.
The temporal decay index between 4 and 20 minutes after the burst
is alpha = 1.0 +/- 1.0.
Further observations and analysis are ongoing.
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