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GCN Circular 9722

GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
2009-07-28T10:35:59Z (15 years ago)
Carole Mundell at ARI, JMU,Liverpool <>
R.J. Smith, C.G. Mundell, I.A. Steele,  A. Melandri, S. Kobayashi, C.J.
Mottram, D.F. Bersier, Z. Cano (Liverpool JMU), A. Gomboc (Ljubljana), C.
Guidorzi (INAF-OAB) report:

"Further analysis of the optical light curves of the uncatalogued optical 
source, at RA(J2000)=21:03:50.6, Dec(J2000)= +64:55:30, reported by Smith 
& Mundell (GCN Circ. 9719) show significant variability and confirm this 
object as the optical afterglow of GRB 090727 (SWIFT trigger 358520, 
Evans et al, GCN Circ. 9718; Goad et al. GCN Circ. 9721).

Within the first 100 mins, the optical light curve shows an early-time 
flare, peaking at r'=19.4 mag, followed by a plateau and break - features 
that are the same as suggested by the partially sampled XRT light curve.

Observations are ongoing."
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