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Swift detection of the brightest X-ray flare from S50716+714

ATel #1495; P. Giommi(ASI/ASDC, Italy), M. Perri(ASDC/INAF, Italy), F. Verrecchia(ASDC/INAF, Italy ), C. Pittori(ASDC/INAF, Italy) , M. Tavani(INAF, Italy), N. Gehrels(NASA/GSFC, USA), M. Chester(PSU, USA)
on 29 Apr 2008; 13:52 UT
Credential Certification: Claudia M. Raiteri (raiteri@oato.inaf.it)

Subjects: X-ray, AGN

Referred to by ATel #: 1500, 1502

On 28 April 2008 Swift detected the blazar S50716+714 at X-ray and UV flux levels significantly larger than ever observed before. An analysis of the XRT data gives a 0.3-10 keV X-ray flux of 4e-11 erg/cm2/s, about 50% larger than that observed at the peak of the giant X-ray flare of October-November 2007. Swift will continue the monitoring of S50716+714 over the next few days, while the AGILE Gamma-ray observatory will include this source within its field of view between April 30 and May 10, 2008. Multi-frequency observations are strongly encouraged.