Non-detection of AT2020xnd at 34 GHz
Dougal Dobie (Swinburne), Andrew O'Brien (UWM), Anna Ho (UC Berkeley), Daniel A. Perley (LJMU), David Kaplan (UWM), Yuhan Yao (Caltech), Vikram Ravi (Caltech)
We observed the field of the transient AT2020xnd (ATel #14105) from 05:30-07:30 UTC on 2020-10-29 with the Australia Telescope Compact Array. Observations were carried out with two 2 GHz bands centered on 33 and 35 GHz.

After combining both bands we place a preliminary 3 sigma upper limit of 108 uJy at 34 GHz on emission from the transient. Combined with the detection of emission at 10 GHz (Astronote 2020-204), this non-detection demonstrates that the peak frequency is higher than initially expected, likely close to 100 GHz.

Further observations are planned.

Thank you to CSIRO staff for supporting these observations.
radio,millimeter,supernovae,transient