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Swift X-ray follow-up observations of AT2018cow/ATLAS18qqn

ATel #11761; L. E. Rivera Sandoval, T. Maccarone (Texas Tech University), P. Brown (Texas A&M University)
on 22 Jun 2018; 16:55 UT
Credential Certification: Liliana Rivera Sandoval (liliana.rivera@ttu.edu)

Subjects: X-ray, Gamma-Ray Burst, Supernovae, Transient

Referred to by ATel #: 11801

We report on Swift X-ray observations of the optical transient AT2018cow/ATLAS18qqn (ATel #11727) obtained on 21 June 2018. We fitted an absorbed power law model to the X-ray spectrum using wilm abundances (Wilms et al. 2000) and vern cross-sections (Verner et al. 1996). We obtained the following values nh= 1.0 +/- 0.9 e21 cm2, photon index = 1.8 +/- 0.3 and flux= 1.2 +/- 0.2 e-11 erg/s/cm2 in the 0.3-10 keV band. Errors are at 90% confidence interval. There is a small decrease in the X-ray flux compared to the value obtained on 19 June 2018 (ATel #11739) when the source had a flux of 2.6 +/- 0.3 e-11 erg/cm2/s in the same energy band.

We thank the Swift team for performing these ToO observations.