{
  "bibcode": "2019GCN.23712....1U",
  "body": "A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M.\nMarisaldi (INAF/OAS-Bologna, and Bergen University), N. Parmiggiani\n(INAF/OAS-Bologna), F. Longo (Univ. Trieste and INFN Trieste), A. Argan, M.\nCardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli,\nC. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti,\nF. Fuschino (INAF/OAS-Bologna), M. Pilia, A. Trois (INAF/OA-Cagliari), I.\nDonnarumma (ASI), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE\nTeam:\n\nThe AGILE Mini-CALorimeter (MCAL) detected the GRB 190114C at T0 =\n2019-01-14 20:57:02.26 +/- 0.01 s (UTC), which was also detected by\nSwift/BAT-XRT (Gropp et al., GCN #23688), MASTER (Tyurina et al., GCN\n#23690), Pan-STARRS (de Ugarte Postigo et al., GCN #23692), NOT (Selsing et\nal., GCN #23695), OASDG (Izzo et al., GCN #23699), GROND (Bolmer et al.,\nGCN #23702), Fermi/GBM (Hamburg et al., GCN #23707), Fermi/LAT (Kocevski et\nal., GCN #23709), X-shooter (Kann et al., GCN #23710), and representing the\nfirst GRB ever detected by ground-based Cherenkov telescopes (MAGIC,\nMirzoyan et al., GCN #23701).\n\nIn the 0.4-100 MeV energy band, the event lasted T90=6.2 s and released a\ntotal number of ~32600 counts in the detector, above an average background\nrate of about 700 Hz. The light curve shows several peaks, which can be\ngrouped in three episodes, characterized by different energy profiles: the\nfirst and third episodes are mostly constituted of counts with energies <\n1.4 MeV, whereas the second central episode exhibits a substantial fraction\nof high-energy counts with energies > 1.4 MeV. The AGILE/MCAL light curve\ncan be viewed at:\nhttp://www.agilescienceapp.it/results/wp-content/uploads/2019/01/GRB190114C_MCAL-1.png\n.\n\nThe time-integrated spectrum of the first episode (from T0 to T0+2.5 s) can\nbe fitted in the energy range [0.4-2 MeV] with a simple power law with\nph.ind.=2.55 -0.07/+0.08, resulting in a reduced chi-square of 1.56 (21\nd.o.f.). The burst fluence in the same energy range and time interval is\n2.11e-05 erg/cm^2 (90% confidence level).\n\nThe time-integrated spectrum of the second episode (from T0+2.5 s to T0+4.8\ns) can be fitted in the energy range [0.4-60 MeV] with a broken power law\nwith alpha=1.46 -0.35/+0.41, beta=2.53 -0.05/+0.07, and a break energy of\n750 +56/-110 keV, resulting in a reduced chi-square of 1.44 (46 d.o.f.).\nThis episode is possibly made by several spectral components. The burst\nfluence in the same energy range and time interval is 1.31e-4 erg/cm^2 (90%\nconfidence level).\n\nThe time-integrated spectrum of the third episode (from T0+4.8 s to T0+6.2\ns) can be fitted in the energy range [0.4-2 MeV] with a simple power law\nwith ph.ind.=2.95 -0.09/+0.10, resulting in a reduced chi-square of 1.11\n(21 d.o.f.). The burst fluence in the same energy range and time interval\nis 1.11e-05 erg/cm^2 (90% confidence level).\n\nThe GRB is clearly detected also by the AGILE scientific ratemeters: in\nparticular, by the Super-AGILE (20-60 keV), Anti-Coincidence (50-200 keV),\nand MCAL (0.4-100 MeV) ratemeters.\n\nFurther analysis is still in progress.\n\nThe AGILE-MCAL detector has a full solid angle acceptance, and is\noperational in the range 0.4 - 100 MeV.",
  "circularId": 23712,
  "createdOn": 1547554424000,
  "email": "alessandro.ursi@gmail.com",
  "subject": "GRB 190114C: AGILE/MCAL detection",
  "submitter": "Alessandro Ursi at INAF/IAPS  <alessandro.ursi@gmail.com>",
  "eventId": "GRB 190114C"
}