GCN Circular 21948
Subject
GRB 170823A: 15 GHz upper limits from AMI
Date
2017-10-01T20:09:17Z (7 years ago)
From
Kunal Mooley at Oxford U <kunal.mooley@physics.ox.ac.uk>
K. P. Mooley (Hintze Fellow, Oxford), T. D. Staley, R. P. Fender
(Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), D.
Titterington, S. H. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods,
P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester)
The AMI Large Array robotically triggered on the Swift alert for GRB
170823A (Troja et al., GCN 21666) as part of the 4pisky program, and
subsequent follow up observations were obtained up to 10 days
post-burst. Our observations at 15 GHz on 2017 Aug 24.41, Aug 25.61 and
Aug 26.58 (UT) do not reveal any radio source at the BAT location
(Stamatikos et al., GCN 21678). While we are dynamic range limited due
to a bright radio source in the vicinity of the GRB location, we are
able to place 3sigma upper limits of 1.0 mJy, 1.1 mJy, and 0.8 mJy at
the respective epochs.
We thank the AMI staff for scheduling these observations. The AMI-GRB
database is a log of all GRB follow up observations with the AMI, and is
available at http://4pisky.org/ami-grb/.