TITLE:   GCN CIRCULAR
NUMBER:  34145
SUBJECT: ZTF23aaoohpy/AT2023lcr: AMI-LA radio detection
DATE:    23/07/05 18:55:59 GMT
FROM:    Assaf Horesh at Hebrew U, Jerusalem <assafh@mail.huji.ac.il>

Assaf Horesh (HUJI), Itai Sfaradi (HUJI), Lauren Rhodes (Oxford), Joe Bright (Oxford), Rob Fender (Oxford), Dave Green (Cambridge), David Titterington (Cambridge)

We report the detection of radio emission from the fast fading red transient ZTF23aaoohpy/AT2023lcr (Swain et al., GCN 34022) using the AMI-LA telescope.

We observed the field of AT 2023lcr with the Arcminute Microkelvin Imager –Large Array (AMI-LA) for 4 hours on the 2023-06-21, with a central frequency of 15.5 GHz. The flux standard 3c286 was used to calibrate the bandpass response and flux scale of the AMI-LA and J1613+3412 was used as an interleaved complex gain calibrator.

A point source is detected in the AMI-LA image at RA = 16:31:37.30 +/- 0.06 s, Dec = +26:22:01.0 +/- 3.0 arcsec, consistent with the reported position of AT 2023lcr. The source is detected at a flux density of 0.50 +/- 0.05 mJy.

We plan to perform follow-up observations with the AMI-LA, and encourage further high cadence multi frequency radio observations with other facilities.

We thank the staff of MRAO for scheduling and performing this observation.