Difference: GCNCIRCULAR21804 ( vs. 1)

Javier Moldon and Rob Beswick (JBO-Manchester University) for the EuroVLBI team

We monitored the field around the optical counterpart SSS17a (Coulter et al., LVC 21529) with the e-MERLIN radio interferometer between August 23 and 28, 2017. We conducted observations at C band centred at 5 GHz with a bandwidth of 512 MHz for 5 hours between 13:00 and 18:00 UTC in each consecutive day.

No significant detection above 5-sigma level is found in the runs with individual rms noise levels between 31 and 39 microJy/beam. The upper limits at 5-sigma level are 180, 160, 160, 190, 150, 150 microJy/beam for days 23 to 28 August, respectively. The average half power beam width of the images is 266 mas x 33 mas with a position angle of 0 degrees. An image produced combining the data from the six runs yields an upper limit of 70 microJy/beam at the 5-sigma level.

Additional observations are planned with e-MERLIN to continue the monitoring of the transient source.

e-MERLIN is a National Facility operated by the University of Manchester at Jodrell Bank Observatory on behalf of STFC.

-- ThomasKupfer - 04 Sep 2017