Allen Telescope Array Detection of Radio Emission From SN 2023MUT
ATel #16176; Joe Bright (Oxford, Breakthrough Listen), Wael Farah (SETI Institute), Itai Sfaradi, Assaf Horesh (HUJI), Ian Heywood (Oxford, Breakthrough Listen), Alexander Pollak (SETI Institute), Andrew Siemion, David DeBoer (Berkeley, Breakthrough Listen)
on 8 Aug 2023; 09:29 UT
Credential Certification: Joe Bright (joe.bright@physics.ox.ac.uk)
Subjects: Radio, Transient
We observed the field of the type IIb supernova SN 2023MUT with the Allen Telescope Array (ATA) between UT 13:38:16.0 and UT 16:11:45.9 on 30th July 2023. The ATA has a flexible backend which allows for two 672 MHz spectral windows to be tuned independently anywhere between 1 and 10 GHz, which we placed centered at 5 GHz and 8 GHz for this observation (Farah et al. in prep., Pollak et al. in prep.). The flux density calibrator 3C147 was used to solve for the absolute flux scale and bandpass response of the array, while interleaved observations of 0501-019 were used to calibrate the time dependent complex gains, with a 10 minute observation per 30 minutes on source. Calibration and imaging were performed in CASA using standard techniques (see e.g. Bright+2023).
We detect an unresolved source at the position of SN 2023MUT, at both 5 GHz and 8 GHz, at the level of 37 +/- 4 mJy, and 45 +/- 5 mJy, respectively, where we have added a conservative 10% absolute flux scale uncertainty in quadrature with the statistical error from the fit. Based on these observations, along with the detection (and lack of archival measurements) reported in ATel #16173, we associate this emission with SN 2023MUT.
Further monitoring of SN 2023MUT is ongoing. We thank the staff at the Hat Creek Radio Observatory for maintaining and operating the ATA. The Allen Telescope Array (ATA) refurbishment program and its ongoing operations receive substantial support from Franklin Antonio. Additional contributions from Frank Levinson, Jill Tarter, Jack Welch, the Breakthrough Listen Initiative and other private donors have been instrumental in the renewal of the ATA. Breakthrough Listen is managed by the Breakthrough Initiatives, sponsored by the Breakthrough Prize Foundation. The Paul G. Allen Family Foundation provided major support for the design and construction of the ATA, alongside contributions from Nathan Myhrvold, Xilinx Corporation, Sun Microsystems, and other private donors. The ATA has also been supported by contributions from the US Naval Observatory and the US National Science Foundation.
