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Upper Limits on Variability of the Crab Flux (2-50 keV)

ATel #2858; C. B. Markwardt (NASA/GSFC), S. D. Barthelmy (NASA/GSFC), W. H. Baumgartner (NASA/GSFC & UMBC)
on 22 Sep 2010; 23:13 UT
Credential Certification: Craig B. Markwardt (craigm@lheamail.gsfc.nasa.gov)

Subjects: X-ray, Gamma Ray, Neutron Star, Transient, Pulsar

Referred to by ATel #: 2867, 2868, 2872

We follow up on a report by AGILE of increased gamma-ray flux from the Crab nebula (Tavani et al. 2010, ATEL #2855).

The BAT team routinely monitors the Hard X-ray intensity of the Crab nebula. In the time period in question (2010-09-19 to 2010-09-21) the BAT does not detect variations of more than 5.5% (15-50 keV; 1-sigma) from the mean level.

We also note that there are no apparent intensity variations detected by the RXTE All-Sky Monitor (2-12 keV) in the same time range.

BAT Hard X-ray Transient Monitor light curve page for Crab (15-50 keV)