GCN Circular 33251
Subject
ZTF23aabmzlp/AT2023azs: AMI-LA radio upper limit
Date
2023-02-02T12:49:13Z (a year ago)
From
Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>
Lauren Rhodes (Oxford), Itai Sfaradi (HUJI), Joe Bright (Oxford), Rob Fender (Oxford), Assaf Horesh (HUJI), David Green (Cambridge), Paul Scott (Cambridge), David Titterington (Cambridge) report:
We observed the field of the candidate optical afterglow ZTF23aabmzlp (AT2023azs)
(Andreoni et al., GCN 33229) with the Arcminute Microkelvin Imager Large-Array (AMI-LA) at 15.5 GHz beginning at UT 00:29:41 on 02-02-2023 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 J1048+7143 was used as an interleaved complex gain calibrator.
We do not detect any radio emission at the position reported in GCN 33229 and report a 3sigma upper limit of 128uJy/beam. Further observations are planned, and any future radio detection will be reported.
We thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA.