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e-MERLIN 5-GHz detection of ASASSN-16fp

ATel #9147; M. K. Argo (JBCA, UK), C. Romero-Canizales (MAS/UDP, Chile), R. Beswick (JBCA, UK), J. L. Prieto (UDP/MAS, Chile)
on 13 Jun 2016; 20:39 UT
Credential Certification: Megan Argo (mkargo@manchester.ac.uk)

Subjects: Radio, Supernovae

We report the radio detection of supernova (SN) ASASSN-16fp (ATel #9086) at 5GHz with the electronic Multi-Element Remotely-Linked Interferometer Network (e-MERLIN). The SN is detected as a point source with a flux density of 1.3 +/- 0.2 mJy (r.m.s. ~60 muJy/beam) in the 62 x 36 milliarcsec at PA=26.9 deg e-MERLIN beam. We infer a 5-GHz luminosity of ~5E26 erg/s/Hz, which is an order of magnitude more luminous than the prototypical broad-lined SN 2002ap at maximum light. The observations were carried out with all available antennas in three 14-hour runs starting on June 5.92, 6.92 and 7.92 2016, with the flux density increasing from 1.2 mJy in the first run to 1.7 mJy in the third run. ASASSN-16fp was discovered by the All-Sky Automated Survey for Supernovae in UGC 11868 and was classified as a broad-lined Type Ic SN with the Nordic Optical Telescope (ATel #9090, see also ATel #9124). The SN has also been detected at 15GHz with the AMI interferometer (ATel #9134). A non-detection with GMRT at 1.4GHz is also reported (ATel #9128), which might be due to the SN being still optically-thick at low frequencies. Further observations are encouraged. We thank the e-MERLIN Director for approval of the project and e-MERLIN staff for their support.