{
  "circularId": 38104,
  "eventId": "GRB 241105A",
  "submitter": "sumanbala2210@gmail.com",
  "createdOn": 1730919987828,
  "editedOn": 1741099297153,
  "bibcode": "2024GCN.38104....1P",
  "submittedHow": "web",
  "body": "U. Pathak (IITB), O. Mukherjee (USRA), R. Sonawane (IISER, TVM), S. Bala (USRA),\nO.J. Roberts (USRA/NASA-MSFC), E. Burns (LSU), P. Veres (UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 16:06:04.66 UT on 05 November 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB241105A (trigger 752515569/241105671),\nwhich was also detected by Swift/BAT-GUANO (DeLaunay et al. 2024, GCN 38091), \nGOTO (Julakanti et al. 2024, GCN 38088), Swift-XRT (Kennea et al. 2024, GCN 38098),\nand SVOM/VT (Qiu et al. 2024, GCN 38099).  The spectroscopic redshift of the optical\ncounterpart observered by VLT/FORS2 (Izzo et al. 2024, GCN 38097) is 2.702.\n\nThe Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position. \n\nThe angle from the Fermi LAT boresight is 145 degrees.\n\nThe GBM light curve consists of a short single pulse with a duration (T90)\nof about 1.4 s (50-300 keV) followed by significant extended emission for ~91 (50-300 keV)\nseconds. The extended emission appears to contain more fluence than the initial spike.\nThe time-averaged spectrum from T0-0.5 to T0+2.6 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.2 +/- 0.1 and the cutoff energy,\nparameterized as Epeak, is 702 +/- 278 keV. Considering the redshift of 2.702, \nand best fit model, we find the isotropic equivalent luminosity Liso = 7.5e+52 erg s-1 (1-10000 keV).\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.8 +/- 0.2)E-06 erg/cm^2. The 64-ms peak photon flux measured\nstarting from T0-0.19 s in the 10-1000 keV band is 11 +/- 3 ph/s/cm^2.\n\nThe total emission (short pulse + extended emission) from T0-2.6 to T0+97 s is best fit by\na power law function with photon index -1.42 +/- 0.04. The total fluence (10-1000 keV) \nin this time interval is (1.1 +/- 0.1)E-05 erg/cm^2.\nUsing z=2.702, we find Eiso = 1.5e+53 erg (1-10000 keV) when fitting the spectrum\nwith a power law function with an exponential high-energy cutoff, with a power-law index of \n-0.03 +/- 0.4 and cutoff energy, parameterized as Epeak, of 221 +/- 30 keV.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Rushikesh Digambar Sonawane PHD231014 at IISER, TVM <rushikesh23@iisertvm.ac.in>",
  "version": 2,
  "subject": "GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission",
  "format": "text/plain"
}