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INTEGRAL observation of the blazar 3C454.3 in outburst

ATel #497; L. Foschini, G. Di Cocco, G. Malaguti (INAF/IASF, Sezione di Bologna), E. Pian (INAF, Astronomical Observatory of Trieste), G. Tagliaferri, G. Ghisellini, L. Maraschi (INAF, Astronomical Observatory of Brera), P. Giommi (ASI-ASDC), N. Gehrels (NASA-GSFC), R. Walter, D. Eckert (ISDC) on behalf of a large collaboration
on 20 May 2005; 14:27 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Luigi Foschini (foschini@bo.iasf.cnr.it)

Subjects: X-ray, Gamma Ray, Request for Observations, AGN, Quasar, Transient

The blazar 3C 454.3 (z = 0.859) has been observed by INTEGRAL as a Target-of-Opportunity for 200 ks, starting on May 15, 2005, at 18:40 UT following the announcement of a bright state at various frequencies (see Balonek, VSNET Alert; Remillard, ATel 484; Trushkin et al., ATel 488).

The source was clearly detected by the IBIS/ISGRI instrument in the 20-40 and 40-100 keV energy bands, with a significance of 20 and 15 sigma, respectively. The flux averaged over the whole exposure in the 20-100 keV band is 1.6x10-10 erg cm-2 s-1.

No further INTEGRAL observations are planned.