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Radio observations of the SLSN-I 2017egm with the VLA

ATel #10546; D. L. Coppejans (Northwestern Univ.), R. Margutti (Northwestern Univ.), B. A. Zauderer (NYU), E. Berger (Harvard Univ.), R. Chornock (Ohio Univ.), M. R. Drout (Carnegie Observatories), D. Milisavljevic (SAO), M. Nicholl (Harvard Univ.)
on 30 Jun 2017; 22:26 UT
Credential Certification: Ryan Chornock (chornock@ohio.edu)

Subjects: Radio, Supernovae, Transient

We observed the field of the nearest H-stripped SLSN, SN2017egm (ATel #10442, #10498, #10499, #10503 #10531, #10537, #10538, Nicholl et al. 2017 arXiv:1706.08517) with the Karl G. Jansky Very Large Array (VLA) starting on June 29, 22:52:39.0 UT for a duration of 1 hr at a frequency of 33 GHz with a total bandwidth of 8 GHz. The host galaxy (NGC3191) is a bright radio source detected in the FIRST survey with a peak flux density of 1.63+-0.13 mJy/beam and an integrated flux density of 15.96+-0.13 mJy at 1.4 GHz (White et al. 1997).

We do not detect SN2017egm or its host galaxy in our observation. The 3-sigma upper-limit for the SN is 150 uJy/beam. At the distance of 135 Mpc, the inferred luminosity limit is L<3.3e27 erg/s/Hz.

We will continue to monitor SN2017egm over the coming months. We thank the VLA staff for making this observation possible.