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Radio upper limits on DLT17ch from the ATCA

ATel #10660; Keith Bannister (ATNF), Alessandra Corsi (Texas Tech), David Sand (U of Arizona)
on 22 Aug 2017; 04:47 UT
Credential Certification: Keith Bannister (keith.bannister@csiro.au)

Subjects: Radio, Supernovae, Transient

We observed the type-Ib/c supernova DLT17ch (=SN 2017 gax; ATel #10638) for approximately 8 hrs with the Australia Telescope Compact Array starting on 2017-08-20 19:34 UTC. The array was in the EW352 configuration which has a resolution of around 30" at 5.5 GHz. Imaging at 5.5 GHz was somewhat hampered by the presence of strong continuum emission from the host galaxy. We observed with 2 GHz bandwidth centered on the frequencies as shown below. We do not detect any radio emission from the position of DLT17ch with the following 5 sigma upper limits: 5.5 GHz: < 800 uJy 9 GHz: < 250 uJy 16.7 GHz: < 360 uJy 21.2 GHz: < 300 uJy 33 GHz: < 330 uJy 35 GHz: < 430 uJy 43 GHz: < 480 uJy 45 GHz: < 600 uJy The 9 GHz flux density upper limit implies a luminosity density less than 4.3 x 10^25 erg/sec/Hz assuming a distance of 12 Mpc. We thank the ATCA staff for facilitating this observation.