GCN Circular 17530
Subject
GRB 150301B: LCOGT-Sutherland observations
Date
2015-03-02T09:00:17Z (9 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), J. Japelj, A. Gomboc (U. Ljubljana),
C.G. Mundell (U. Bath), on behalf of a large collaboration report:
One of the Las Cumbres Observatory 1-m telescopes in Sutherland
(South Africa) began observing Swift and Fermi GRB 150301B
(Lien et al. GCN 17515; Burns et al. GCN 17525) on March 01
at 20:07:30 UT, i.e. ~29.4 minutes after the BAT trigger
with the r', i', and g' filters.
We detect the optical afterglow (Lien et al. GCN 17515;
Buckley et al. GCN 7518; Kann et al. GCN 17522; de Ugarte
Postigo et al. GCN 17523) with the following magnitudes:
Mid time from Total Exp Filter Magnitude
trigger (min) (s)
-------------------------------------------------
37.7 360 r' 18.85 +- 0.25
42.3 360 i' 18.5 +- 0.3
-------------------------------------------------
Values have been calibrated against nearby USNOB-1 stars
(R2 and I). Compared with earlier (Buckley et el.)
and later (Kann et al.) observations, our values
suggest an overall power-law decay index ~1.