Further AMI-LA observations of SN2017eaw at 15 GHz

ATel #10413; K. P. Mooley (Hintze Fellow, Oxford), T. Cantwell (Manchester), D. J. Titterington, Y. C. Perrott (Cambridge), J. Bright, R. P. Fender (Oxford), A. Horesh (HUJI)
on 22 May 2017; 19:05 UT
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Credential Certification: Kunal Mooley (kunal.mooley@physics.ox.ac.uk)

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Following the initial AMI-LA observation of SN2017eaw reported in ATel #10394, we carried out additional at 15 GHz on 2017 May 17.21 and May 20.18 (UT). We do not detect any significant emission from the location of the supernova, with conservative upper limits of 1.0 mJy and 0.6 mJy respectively (we adopt ~5sigma upper limits instead of 3sigma due to the presence of nearby extended radio sources within the host galaxy). The latter upper limit corresponds to a 15 GHz spectral luminosity of 2.2e25 erg/s/Hz (at a distance of 5.5 Mpc), which is lower than the peak spectral luminosities of typical radio-bright core collapse supernovae. This may indicate a tenuous circum-burst medium or strong synchrotron self-absorption during the early phase of the supernova evolution. More observations with the AMI-LA are planned. We thank the AMI staff for scheduling these observations.