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AGILE gamma-ray detection of the Catalina transient CSS111117

ATel #3858; C. Pittori, F. Lucarelli (ASDC), A. Bulgarelli, F. Gianotti, M. Trifoglio (INAF/IASF-Bo), E. Striani (Univ. Roma Tor Vergata), G. Piano (INAF/IASF-Rm), I. Donnarumma (INAF/IASF-Rm), S. Vercellone (INAF/IASF-Pa), A. Chen, A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), E. Del Monte, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda, A. Argan, S. Sabatini, V. Vittorini (INAF/IASF-Rm), M. Cardillo, M. Tavani (INAF/IASF-Rm, and Univ. Tor Vergata), G. Pucella (ENEA), F. Fuschino, M. Galli, C. Labanti, M. Marisaldi, G. Di Cocco (INAF/IASF-Bo), A. Pellizzoni, M. Pilia, A. Trois (INAF/OA-Cagliari), G. Barbiellini (INFN Trieste), F. Longo (Univ Trieste and INFN Trieste), E. Vallazza (INFN Trieste), A. Morselli, P. Picozza, (INFN and Univ. Roma Tor Vergata), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), S. Colafrancesco (INAF/OA-Roma and Wits University), F. Verrecchia, P. Santolamazza, P. Giommi (ASDC), L. Salotti and G. Valentini (ASI)
on 11 Jan 2012; 10:05 UT
Credential Certification: Carlotta Pittori (carlotta.pittori@asdc.asi.it)

Subjects: Radio, Gamma Ray, AGN, Blazar, Transient

The discovery of several flaring radio sources and blazars by the Catalina Real-time Transient Survey (CRTS) during the last few weeks was recently reported in ATel #3853. We performed a search for related gamma-ray flares in the AGILE data archive on all sources reported in the CRTS ATel.

On November 17th, 2011 AGILE detected a transient gamma-ray emission above 100 MeV from a source at Galactic Coordinates (l,b) = (181.1,70.4) +/- 1.2 deg (95% stat.) +/- 0.1 deg (syst.) (R.A.,Dec. = 11h 28m 59.4s, +35d 56m 46.4s (J2000)).

Integrating from 2011-11-17 00:00 UT to 2010-11-19 00:00 UT, a maximum likelihood analysis yields a source detection with a significance level of 4.7 sigma and with a flux (2.0+/- 0.7) x 10E-6 ph/cm2/s (E > 100 MeV).

The AGILE detection is consistent both in position and time with the Catalina transient source CSS111117:112759+362029, associated with the blazar BZQJ1127+3620 and with the 2FGL J1127.6+3622 source.

The recorded flux shows an increase by a factor of about 40 with respect to the 2-sigma upper limit of 5 x 10E-8 detected by AGILE during the period July 2007 - January 2011 for a non continuous exposure.

The November 2011 measurement was obtained with AGILE observing a large portion of the sky in spinning mode.