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INTEGRAL non-detection of enhanced Crab flux

ATel #2856; C. Ferrigno, R. Walter, E. Bozzo (ISDC/University of Geneva), P. Bordas (ISDC/IAAT)
on 22 Sep 2010; 17:32 UT
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)

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

Referred to by ATel #: 2867, 2868, 2872

The INTEGRAL observations of the Crab nebula, performed for calibration purpose from 2010 September 12 at 10:32 to 2010 September 19 at 12:48, partially covered the period in which AGILE detected an episode of enhanced gamma-ray activity from a position consistent with that of the Crab (ATel #2855).

In these observations no statistically significant increase in the Crab flux was observed (we checked the ISGRI light curves extracted in the 20-40, 40-100, and 100-400 keV energy bands). A close inspection of the ISGRI point spread function in the mosaicked image obtained from the same observations did not evidence the presence of other hard X-ray sources within 0.5 degrees from the position of the Crab.

The Swift/BAT Hard X-ray Transient Monitor (see ATel #904) does not show any significant deviation from a constant flux during the time interval 2010, September 18-22, in the 15-50 keV energy range.