Difference: GCNCIRCULAR21786 ( vs. 1)

W. Fong, R. Margutti (Northwestern), D. Haggard (McGill) report on behalf of a larger collaboration:

We analyzed observations of the field of the EM counterpart to LVC trigger G298048 with the Chandra X-ray Observatory (CXO; ObsID 20728, PI Troja) starting on 2017 Sep 1.640 UT (15.1 days after the LVC trigger time). In 50 ksec of observations, we clearly detect X-ray emission at the location of the optical transient (Coulter et al., LVC GCN 21529; Allam et al., LVC GCN 21530; Sheng Yang et al., LVC GCN 21531; Chambers et al., LVC GCN 21553), suggesting continued X-ray emission from the transient (Troja et al., LVC GCN 21765). Extended emission from the host galaxy (Margutti et al., LVC GCN 21648; Evans et al., LVC GCN 21612) is still detected. We also note the presence of a third X-ray source in the Swift/XRT error circle (Evans et al., LVC GCN 21612; RA,Dec = 13:09:48.014,-23:23:04.93), that has not been previously reported.

We thank Belinda Wilkes and the entire Chandra team for their great support with these observations.

-- ThomasKupfer - 02 Sep 2017