{
  "bibcode": "2021GCN.31105....1U",
  "body": "A. Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), A. Trois\n(INAF/OA-Cagliari), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A.\nArgan, M. Cardillo, C. Casentini, Y. Evangelista, E. Menegoni, L. Foffano,\nG. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), A.\nBulgarelli, A. Di Piano, V. Fioretti, F. Fuschino, N. Parmiggiani\n(INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University),\nM. Pilia (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste\nand INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the\nAGILE Team:\n\nThe AGILE satellite detected the GRB 211120A at T0 = 2021-11-20 23:05:20\n(UTC), reported by GECAM (GCN #31100) and AstroSat CZTI (GCN #31104).\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 6 s and\nit released a total number of 821 counts in the SA detector (above a\nbackground rate of 96 Hz), 9275 counts in the MCAL detector (above a\nbackground rate of 1210 Hz), and 23969 counts in the AC detector (above a\nbackground rate of 3440 Hz). The AGILE ratemeter light curves can be found\nat http://www.agilescienceapp.it/notices/GRB211120A_AGILE_RM.png .\n\nThe event also triggered a partial high time resolution MCAL data\nacquisition, covering the main peak of the burst, from T1 = 2021-11-20\n23:05:20.0 s +/- 0.5 (UTC) to T2 = 2021-11-20 23:05:26.0 +/- 0.5 s (UTC),\nand released 2291 counts in the detector, above a background rate of 710\nHz. The time-integrated spectrum of the burst between T1 and T1+2.43 s can\nbe fitted in the energy range 0.4-20 MeV with a single power-law with ph.\nind. = -2.43 (-0.34/+0.44), resulting in a reduced chi-squared of 1.09 (62\nd.o.f.) and a fluence of 5.9e-06 ergs/cm^2 (90% confidence level), in the\nsame energy range. The MCAL light curve can be found at:\nhttp://www.agilescienceapp.it/notices/GRB211120A_MCAL.png .\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 #564534599 the T0 was affected by a temporal\nshift of about +279 sec due to a temporary ground software problem now\nsolved.",
  "circularId": 31105,
  "createdOn": 1637679936000,
  "email": "alessandro.ursi@gmail.com",
  "subject": "GRB 211120A: AGILE detection",
  "submitter": "Alessandro Ursi at INAF/IAPS  <alessandro.ursi@gmail.com>",
  "eventId": "GRB 211120A"
}