[vsnet-grb-info 8192] GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9722
SUBJECT: GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
DATE:    09/07/28 10:35:59 GMT
FROM:    Carole Mundell at ARI, JMU,Liverpool  <cgm at 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."