TITLE:   GCN CIRCULAR
NUMBER:  33252
SUBJECT: ZTF23aaarlti/AT2023avj: AMI-LA radio detection
DATE:    23/02/02 12:50:02 GMT
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 ZTF23aaarlti (AT2023avj)
(Ho et al., GCN 33226) with the Arcminute Microkelvin Imager Large-Array (AMI-LA) at 15.5 GHz beginning at UT 21:46:05.6 on 31-01-2023 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 J0957+5522 was used as an interleaved complex gain calibrator.

We detect an unresolved source at a position consistent with the one reported in GCN 33226 with a (preliminary) flux density of 157+/-14uJy/beam (including both a statistical uncertainty and a 5% absolute flux scale uncertainty). Further observations are planned.

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