{
  "bibcode": "2022GCN.31733....1U",
  "body": "A. Ursi (INAF/IAPS), A. Di Piano (INAF/OAS-Bologna), F. Verrecchia, C.\nPittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor\nVergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, E. Menegoni,\nL. Foffano, G. Piano (INAF/IAPS), F. Lucarelli (SSDC, and INAF/OAR), A.\nBulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M.\nMarisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois\n(INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN\nTrieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:\n\nThe AGILE satellite detected the long GRB 220308A at T0 = 2022-03-08\n05:43:08 (UTC), reported by INTEGRAL/SPI-ACS (trig#9761), Fermi/GBM\n(trigger no.668410535), CALET (GCN #31719), Konus-Wind (GCN #31723),\nSwift/BAT (GCN #31716), and triangulated by IPN (GCN #31715).\n\nThe burst is clearly visible in the AGILE scientific ratemeters of the\nSuperAGILE (SA; 20-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and\nAntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 22 s and\nit released a total number of 2675 counts in the SA detector (above a\nbackground rate of 140 Hz), 54840 counts in the MCAL detector (above a\nbackground rate of 1300 Hz), and 104080 counts in the AC detector (above a\nbackground rate of 3680 Hz). The AGILE ratemeter light curves can be found\nat https://tools.ssdc.asi.it/ImgView/Agile/GRB220308A_AGILE_RM29 .\n\nThe event also triggered a partial high time resolution MCAL data\nacquisition, covering the main peaks of the burst, from T1 = 2022-03-08\n05:43:08.21 s +/- 0.01 (UTC) to T2 = 2022-03-08 05:43:15.06 +/- 0.01 s\n(UTC), and released 16490 counts in the detector, above a background rate\nof 640 Hz. The time-integrated spectrum of the burst in this time interval\ncan be fitted in the energy range 0.4-10 MeV with a Band function with\nalpha = -0.70 (frozen), beta = -2.45 (-0.11/+0.09), and Epeak = 760\n(-98/+97) keV, resulting in a reduced chi-squared of 1.32 (47 d.o.f.) and a\nfluence of 1.4e-04 ergs/cm^2 (90% confidence level), in the same energy\nrange. The MCAL light curve can be found at:\nhttps://tools.ssdc.asi.it/ImgView/Agile/077313_GRB_57380300810779330 .\n\nAdditional analysis of AGILE data is in progress. Automatic MCAL GRB alert\nNotices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html. Please\nnote that in the MCAL notice #573803008 the T0 was affected by a temporal\nshift of about +19.5 sec due to episodic automated ground software problems\nwhich are then corrected offline.",
  "circularId": 31733,
  "createdOn": 1646921101000,
  "email": "alessandro.ursi@gmail.com",
  "subject": "GRB 220308A: AGILE detection",
  "submitter": "Alessandro Ursi at INAF/IAPS  <alessandro.ursi@gmail.com>",
  "eventId": "GRB 220308A"
}