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GCN Circular 36489

Subject
GRB 240511A: radio detection of afterglow candidate
Date
2024-05-15T18:05:58Z (2 months ago)
From
Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>
Via
Web form
Lauren Rhodes, Rob Fender (Oxford), Dave Green, Dave Titterington (Cambridge) report:

We observed the field of GRB 240511a (GCN 36428, 36430) with the Arcminute Microkelvin Imager - Large Array (AMI-LA) at 15.5 GHz beginning at UT 04:33:54 on 15-May-2024 for a total of 4 hours. The flux standard 3c286 was used to calibrate the bandpass response and flux scale of the AMI-LA and J2232+1143 was used as an interleaved complex gain calibrator.

We detected an unresolved radio source at the position of the afterglow candidate (GCN 36442) with a flux density of about 600uJy/beam. The rms noise in the field is about 70uJy/beam.

More observations are planned.

We thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA.
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