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AT2018cow: Further ATCA monitoring

ATel #11818; Dougal Dobie (University of Sydney), Vikram Ravi (Caltech), Anna Ho (Caltech), Mansi Kasliwal (Caltech), Tara Murphy (University of Sydney)
on 5 Jul 2018; 05:33 UT
Credential Certification: Dougal Dobie (ddob1600@uni.sydney.edu.au)

Subjects: Radio, Transient

We have observed the position of AT2018cow (ATel #11727) with the Australia Telescope Compact Array (ATCA) on 2018-06-28 from 08:30-14:00 UT at central frequencies of 5.5 GHz, 9 GHz, 16.7 GHz and 21.2 GHz with a bandwidth of 2 GHz in each band, and 34 GHz with a bandwidth of 4 GHz. A point source coincident with the location of AT2018cow (ATel #11727) is detected in all bands. We report preliminary flux densities of: ~0.22 mJy at 5.5 GHz; ~0.52 mJy at 9 GHz; ~1.5 mJy at 16.7 GHz; ~2.3 mJy at 21.2 GHz; ~7.6 mJy at 34 GHz. Analysis is ongoing and subsequent epochs are planned. A flux-density scale error in our previous ATCA observations (ATel #11795) resulted in an incorrect measurement being reported at 9 GHz. The corrected flux density of AT2018cow at 9 GHz on 2018-06-26 is ~0.3 mJy. Thank you to CSIRO staff for supporting these observations.