Radio observations of SN 2021yja
ATel #14915; S. D. Ryder (Macquarie University), L. Marnoch (Macquarie University), E. Kundu (Michigan State University), M. D. Filipovic (Western Sydney University), R. Alsaberi (Western Sydney University), G. Anderson (ICRAR/Curtin University), C. Stockdale (Marquette University), K. Maeda (Kyoto University), M. Renaud (LUPM, CNRS/IN2P3), R. Kotak (University of Turku)
on 13 Sep 2021; 22:51 UT
Credential Certification: Stuart Ryder (Stuart.Ryder@mq.edu.au)
Subjects: Radio, Supernovae
Referred to by ATel #: 14942
The young core-collapse supernova SN 2021yja (=ATLAS21bidw; TNS AstroNote 2021-235) in NGC 1325, originally classified as a type II event and recently suggested to be a type Ic SN, has been observed with the Australia Telescope Compact Array (ATCA) at 5.5 and 9.0 GHz on 9 Sep 2021 20:00-23:00 UT, and at 18 GHz on 11 Sep 2021 19:30-20:30 UT. No radio emission was detected at the reported location, to 3-sigma upper limits on flux density of 0.04 mJy, 0.03 mJy, and 0.05 mJy at 5.5 GHz, 9.0 GHz, and 18 GHz, respectively. Adopting the host galaxy distance as 22 Mpc from the NASA Extragalactic Database (NED) this implies upper limits on the 5.5 GHz and 18 GHz luminosities within 4 days of explosion of 2.3E+25 erg/sec/Hz and 2.9E+25 erg/sec/Hz, respectively. We would like to extend our thanks to the ATCA staff for enabling these observations. The ATCA is part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. We acknowledge the Gomeroi people as the traditional owners of the Observatory site.
