GCN Circular 10779
Subject
GRB 100518A: optical afterglow decay
Date
2010-05-19T09:04:53Z (14 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
D. Kopac (U. Ljubljana), C. Guidorzi (U. Ferrara), Z. Cano (Liverpool JMU),
A. Gomboc (U. Ljubljana), report on behalf of a larger collaboration:
The 2-m Faulkes Telescope North observed the optical afterglow of
GRB 100518A (Cano et al. GCN Circ. 10776) from 4.2 min to 3.7 hours from
the INTEGRAL trigger time (Mereghetti et al. GCN Circ. 10772) in
the BVRi filters.
Within this time interval the afterglow is observed to decay in both
R and i filters with an average power-law decay slope of 0.7 +/- 0.1,
with the following initial magnitudes:
Mid time from Total Exp Filter Magnitude
trigger (min) (s)
-------------------------------------------------
4.9 3x10 R 19.4 +- 0.1
9.8 10 i 18.8 +- 0.2
-------------------------------------------------
Magnitudes have been calibrated from nearby USNOB-1 stars.