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Swift/XRT monitoring of SN2011dh: evidence for fading

ATel #3420; R. Margutti, A. Soderberg (Harvard University)
on 9 Jun 2011; 20:38 UT
Credential Certification: Raffaella Margutti (rmargutti@cfa.harvard.edu)

Subjects: X-ray, Supernovae

Referred to by ATel #: 3432, 3641

We have analyzed 24 ks of Swift/XRT data of SN1011dh (Silverman et al. 2001, Atel #3398; Reiland et al. 2011, CBET #2736) collected in the time period June 3-7. In agreement with Campana & Burrows (2011, Atel #3414) we find that the source is detected at an average level of ~6 E-03 c/s. We furthermore find that the source has faded from ~1.3 E-02 c/s to ~3 E-03 c/s, with a power-law decay index of alpha~ -1.8 (+0.6,-0.6 90% c.l.) The probability of a chance fluctuation is below 0.01% (binomial test), thus we conclude that the observed decay is statistically significant.