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AT2018cow: Swift/BAT data search

ATel #11782; A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), A. Tohuvavohu (PSU), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), R. Margutti (Northwestern University), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i. e. the Swift-BAT team):
on 26 Jun 2018; 02:18 UT
Credential Certification: Amy Lien (amy.y.lien@nasa.gov)

Subjects: X-ray, Gamma Ray, Transient

Referred to by ATel #: 11793

We report the search results of AT2018cow in the Swift/BAT data. Using the source location of (RA, Dec) = (244.00090, 22.26800) deg from Smartt et al. ATel #11727, the BAT mask-weighted light curve from the BAT survey data (14-195 keV) shows marginal detections of AT2018cow at ~ 3 sigma at ~T0, ~T0+1, and ~T0+6 days. T0 = 2018-06-16 at 10:35:02 UTC, which is the time of discovery reported in Smartt et al. ATel #11727.

The 3 sigma detections are roughly consistent with NuSTAR flux measurements (Margutti et al., ATel #11775). However, we note that due to the low significance of these detections, we cannot rule out that these are due to noise fluctuation.

A search with the BAT onboard sub-threshold triggers found no events with localizations that are consistent with AT2018cow.

The results of the BAT data analysis are at
https://swift.gsfc.nasa.gov/results/BATbursts/AT2018cow/top.html

The light curves and data will continue to be updated on a daily basis in the near future.