Chandra gratings observations of AT18cow
ATel #11779; Thomas J. Maccarone, Liliana Rivera Sandoval, Alessandra Corsi (TTU), David Pooley (Trinity), Christian Knigge (Southampton)
on 25 Jun 2018; 18:42 UT
Credential Certification: Tom Maccarone (thomas.maccarone@ttu.edu)
Subjects: X-ray, Supernovae
We have made a preliminary analysis of a 50 kilosecond Chandra LETG-HRC spectrum of AT18cow (ATel 11727), taken starting on 6/24 at 15:04 UT. We find no evidence for strong lines in the spectrum, but a further more careful examination will be conducted in the near future.
We find a flux level and continuum fit consistent with past data and its trends (ATel 11737, 11761, 11773, 11775):
N_H = 0.07(+0.1)(-0.05)
Gamma = 1.79 (+0.58)(-0.43)
Flux = 9.2e-12 erg/sec/cm^2
We thank the Chandra Director's Office for approval of this DDT.
