GCN Circular 11265
Subject
GRB 100909A: Faulkes Telescope North afterglow candidate
Date
2010-09-09T14:58:36Z (14 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), Z. Cano, D. Bersier (LJMU),
P. O'Brien (U. Leicester) report on behalf of a large collaboration:
The Faulkes Telescope North automatically began observing INTEGRAL
GRB 100909A (Mereghetti et al. GCN Circ. 11260) on September 09,
10:42:34 UT, 1.6 hours from the GRB trigger time.
Within the Swift-XRT error circle (Siegel et al. GCN Circ. 11261)
we identify an uncatalogued, possibly fading object at the following
position:
RA(J2000.0): 04:55:47.86
Dec(J2000.0): +54:39:32.1
with the following magnitudes:
Mid Time from Exposure Filter Magnitude
GRB (hours) (s)
-------------------------------------------------------
2.07 540 R 21.6 +- 0.2
2.16 520 i 20.6 +- 0.1
5.05 1200 R 22.1 +- 0.2
-------------------------------------------------------
Calibration was done against the nearby USNOB-1 star
RA,DEC=04:55:49.14, +54:39:42.66, assuming R2=16.82, I=16.06.
We note that the uncatalogued source lies 3" from a
USNOB-1 object with R2=18.54.