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Radio Non-Detection of the Type II Supernova ASASSN-14ha in NGC 1566

ATel #6480; S. D. Ryder (AAO), J. Polshaw (QUB), R. Kotak (QUB), C. J. Stockdale (Marquette)
on 17 Sep 2014; 04:40 UT
Credential Certification: Stuart Ryder (sdr@aao.gov.au)

Subjects: Radio, Millimeter, Supernovae

The young Type II supernova ASASSN-14ha (ATel #6460) in the galaxy NGC 1566 has been observed with the ATCA + CABB 2 GHz backend system on 2014 Sep 15.9 at a frequency of 18 GHz. No radio emission was detected at the supernova location, to a 3-sigma upper limit of 0.09 mJy. Observations were complicated by the proximity of the supernova to the Seyfert nucleus of NGC 1566 (flux of ~5 mJy at 18 GHz), coupled with the spatial resolution (6 arcsec) of the hybrid array. Adopting the median host galaxy distance of 10 Mpc from NED, this implies an upper limit on the luminosity at 18 GHz of 1.1E25 erg/s/Hz. We would like to extend our thanks to the ATCA staff for enabling these observations. The Australia Telescope Compact Array is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.