e-MERLIN radio detection of SN 2020oi at 5 GHz
ATel #13448; J. Moldon (IAA-CSIC, Granada), A. Horesh (Hebrew Univ, Jerusalem), M. Perez-Torres (IAA-CSIC), I. Sfaradi (Hebrew Univ.), P. Lundqvist (Stockholm Univ.)
on 5 Feb 2020; 17:16 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Javier Moldon (jmoldon5@gmail.com)
Subjects: Radio, Supernovae, Transient
We report the first radio detection of the type Ic SN 2020oi (ATel #13391, ATel #13393 and radio detections in ATel #13398, ATel #13400, ATel #13401) at 5.1 GHz, using the electronic Multi-Element Radio Linked Interferometer Network (e-MERLIN). SN 2020oi was discovered on 7.9 June 2013 (Ciabattari et al. CBET #3557) in M100 (D=17 Mpc).
We observed SN 2020oi with e-MERLIN at a frequency of 5.1 GHz and a bandwidth of 512 MHz on 2020 Jan 13.2, 17.2, and 20.2. The resulting synthesized Gaussian beam was of 70 x 30 sq. milliarcseconds. All three observing epochs yielded clear detections of the source, which also showed an increasing trend from about 0.22 mJy on Jan 13.2 to about 0.8 mJy on Jan 17.2, The peak of emission has the following coordinates (average of all three epochs): RA(J2000.0)=12:22:54.920, DEC(J2000.0)=15:49:25.0054 with an astrometric uncertainty below 5 mas. The source is still in its early, optically thick phase at this frequency, and further observations are ongoing with e-MERLIN. We thank the e-MERLIN staff for supporting these observations.