GCN Circular 9722
Subject
GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
Date
2009-07-28T10:35:59Z (15 years ago)
From
Carole Mundell at ARI, JMU,Liverpool <cgm@astro.livjm.ac.uk>
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."