ATel #1221; A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milano), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, E. Costa, M. Feroci, I. Donnarumma, L. Pacciani, E. Del Monte, F. Lazzarotto, P. Soffitta, Y. Evangelista, I. Lapshov, M. Rapisarda, A. Argan, A. Trois , G. De Paris (INAF/IASF Roma), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), F. Mauri (INFN Pavia) and P. Giommi, C. Pittori, L. A. Antonelli, D. Gasparrini, S. Cutini, F. Verrecchia (ASDC) and L. Salotti (ASI)
on 21 Sep 2007; 15:53 UT

Subjects: Gamma Ray, AGN, Quasars

The AGILE satellite, currently in its science performance verification phase, during the Observing Block that started on 2007-09-04 12:00 UT, detected significant gamma-ray emission from a source possibly associated with blazar TXS 0716+714.

A preliminary maximum likelihood analysis of the AGILE-GRID (Gamma-Ray Imaging Detector) data obtained between 2007-09-10 13:50 UT and 2007-09-20 10:13 UT for photon energies above 100 MeV results in a detection significance of about 8 sigma. The positional error box, that does not yet take into account possible systematic effects, is centered at Galactic coordinates l = 143.8 deg, b = 27.6 deg. The 95% confidence level contour has a radius of about 0.4 degrees. The blazar TXS 0716+714, that has been associated with the gamma-ray source 3EG J0721+7120, lies at a distance of 0.44 degrees from the best fit position of the gamma-ray source. We therefore tentatively associate the AGILE source with this blazar.

Considering that the in-flight calibration of the GRID is still ongoing, and despite the preliminary GRID positioning capability at off-axis angles (20 to 40 deg for this observation), we strongly encourage multi-frequency observations of the field of the gamma-ray source detected by AGILE. The AGILE pointing of the Galactic plane region that includes this gamma-ray source will continue until 2007-09-23 12:00 UT.

ATel #1199; A. Bulgarelli (INAF/IASF Bologna), S. Vercellone, A. Giuliani, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milano), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, E. Costa, M. Feroci, I. Donnarumma, L. Pacciani, E. Del Monte, F. Lazzarotto, P. Soffitta, Y. Evangelista, I. Lapshov, M. Rapisarda, A. Argan, A. Trois (INAF/IASF Roma), G. Barbiellini, F. Longo (INFN Trieste), G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, F. Gianotti, M. Trifoglio (INAF/IASF Bologna), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari (INFN Roma-1) and P. Giommi, C. Pittori, L. A. Antonelli, D. Gasparrini, S. Cutini, F. Verrecchia (ASDC) and L. Salotti (ASI)

on 31 Aug 2007; 16:53 UT
Password Certification: Stefano Vercellone (stefano@iasf-milano.inaf.it)

Subjects: Gamma Ray, AGN, Quasars, Transients

The AGILE satellite, currently in its science performance verification phase, during an observation centered near the Galactic plane (l=334.44, b=10.06) that started on 2007-08-27 12:00 UT, detected significant gamma-ray emission from a source at approximately 33 degrees off the AGILE pointing direction. A preliminary maximum likelihood analysis of the AGILE-GRID (Gamma-Ray Imaging Detector) data obtained between 2007-08-27 14:48 UT and 2007-08-30 10:50 UT for photon energies above 100 MeV results in a detection significance of about 4 sigma. The positional error box derived from our preliminary maximum likelihood analysis (that does not, as yet, take into account possible systematic effects) results in a 95% contour level centered at the position l = 351.1, b = 39.7 with a radius of about 0.5 degrees. We note that this position is marginally consistent with the radio position of the blazar TXS 1510-089 that has been associated with the gamma-ray source 3EG J1512-0849. Considering that the in-flight calibration of the GRID is still ongoing, and despite the preliminary GRID positioning capability at substantial off-axis angles, we strongly encourage multi-frequency observations of the field of the gamma-ray source detected by AGILE. The AGILE pointing of the Galactic plane region that includes this gamma-ray source will continue until 2007-09-01 12:00 UT.

TITLE:   GCN CIRCULAR

NUMBER:  6767

SUBJECT: GRB 070824 - Combined SuperAGILE/IPN Localization

DATE:    07/08/30 17:46:04 GMT

FROM:    Marco Feroci at IASF/INAF  <feroci@iasf-roma.inaf.it>

Combined SuperAGILE/IPN Localization of the long and bright GRB 070824

I. Donnarumma, E. Del Monte, F. Lazzarotto, M. Feroci, A. Giuliani, M. Marisaldi, on behalf of the AGILE Team,

B. Preger, on behalf of the AGILE Science Data Center, S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov and T. Cline on behalf of the Konus-Wind and Konus-A teams, K. Hurley on behalf of the IPN Teams, J. Cummings, D. Palmer and H. Krimm, on behalf of the Swift/BAT team,D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team,

report:

GRB 070824 triggered the SuperAGILE ground software trigger on 24 August 2007, at 20:50:09 UT. The GRB was seen as a 3 s long event, preceded by a weaker 2 s precursor 5 s earlier. The SuperAGILE T90 for this event was 9.5 s.  The event was observed by SuperAGILE at 48.1 deg off-axis,  which is in a region of the instrument field of view with only one-dimensional imaging. In spite of this, the event was observed on all SuperAGILE detectors; due to its hardness,  it passed through the collimator shields. In addition, its arrival direction was partially obscured by the Earth's atmosphere for AGILE. For these reasons, the event was imaged by SuperAGILE with only 4.6 sigma significance. The SuperAGILE-only error box is thus a long, narrow strip, limited by the instrument field of view and Earth occultation in one direction and by the imaging uncertainty in the other. For the latter we assumed a 20 arcmin error radius, including statistics and systematics, due to the low statistics of the detection and the far off-axis position. The resulting

error box is:          

RA      Dec

===============

172.281 -27.240

171.938 -26.648

147.942 -34.944

148.056 -34.281

The SuperAGILE light curve may be found at the AGILE Science Data Center and AGILE-Team web pages.

This event was independently detected by other IPN experiments, namely Konus-Wind, Swift/BAT, RHESSI, AGILE/Minicalorimeter, and the AGILE/Anticoincidence, as well as by Konus-A (Cosmos-2421). Their detection combined to provide further constraints to the burst localization, as shown in the figure at www.ssl.berkeley.edu/ipn3/070824.

The final localization of GRB 070824 is thus limited by the corners of a triangular area:

   RA      Dec   

==================

1: 172.055 -26.864

2: 171.188 -27.715

3: 172.281 -27.240