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SuperAGILE detects enhanced hard X-ray emission from Mkn 421

ATEL # 1574; E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta, A. Argan, A. Trois , M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini (INAF/IASF Roma), A. Chen, S. Vercellone, A. Giuliani, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo (INAF/IASF Milano), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), G. Barbiellini, F. Longo, E. Vallazza (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Cattaneo (INFN Pavia), C Pittori,F. Verrecchia, B. Preger, P. Giommi (ASDC) and L. Salotti (ASI)
on 12 Jun 2008; 15:42 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Marco Feroci (marco.feroci@iasf-roma.inaf.it)

Subjects: X-ray, Gamma Ray, Request for Observations, AGN
Referred to by ATEL #: 1583

During an AGILE pointing at the North Galactic Pole region aiming at WComae, started on 2008 June 9 18:00 UT, SuperAGILE detected enhanced hard X-ray emission from the BL Lac source Mkn 421, lying approximately 17 degrees off-axis with respect to the center of the field of view. The measured average 20-60 keV flux was 32 mCrab between 2008 June 10 06:30 UT and 2008 June 11 06:30 UT, and 41 mCrab between 2008 June 11 06:30 UT and 2008 June 12 08:00 UT. The latest reported hard X-ray activity of Mkn 421 was on 2008 March when Swift/BAT (Krimm et al., ATel #1449) detected flaring activity from 22 to 110 mCrab in the 15-50 keV energy range. AGILE will continue on monitoring the same sky region for the next 3 days, with both the hard X-ray monitor SuperAGILE and the gamma-ray imager GRID.


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R. E. Rutledge , Editor
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