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GCN Circular 21947

Subject
GRB 170822A: 15 GHz upper limits from AMI
Date
2017-10-01T20:07:24Z (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 
170822A (Melandri et al., GCN 21640) as part of the 4pisky program, and 
subsequent follow up observations were obtained up to 30 days 
post-burst. Our observations at 15 GHz on 2017 Aug 22.42, Aug 25.34, Aug 
26.34, Aug 30.37, Sep 03.28 and Sep 20.26 (UT) do not reveal any radio 
source at the XRT location (Beardmore et al., GCN 21643), with 3sigma 
upper limits of 165 uJy, 132 uJy, 138 uJy, 210 uJy, 210 uJy and 138 uJy 
respectively.

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/.
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