Gamma-ray Burst 190103A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Circular #23600
  A.Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:
  The AGILE Mini-CALorimeter (MCAL) detected a burst at T0 = 2019-01-03 16:42:15.05 +/- 0.01 s (UTC).
  The event lasted about 4.7 s and released a total number of ~5426 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of about 700 Hz. The light curve shows two peak episodes.
  The GRB is clearly detected also by the AGILE scientific ratemeters; in particular, by the Super-AGILE (20-60 keV), Anti-Coincidence (50-200 keV), and MCAL (0.4-100 MeV) ratemeters.
  Further analysis is still in progress.
  The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.
• GCN Circular #23609
  Analysis of AstroSat CZTI data showed the detection of a long GRB 190103A, which was also detected by AGILE/MCAL (Ursi A. et al., GCN 23600).
  The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 16:42:16.500 UT, ~ 1 s a fter AGILE/MCAL trigger. The measured peak count rate is 2221 cts/s above the ba ckground in combined data of four quadrants, with a total of 10698 cts. The loca l mean background count rate was 486.7 cts/s. Using cumulative rates, we measure a T90 of 25.4 s. In preliminary analysis, we find that 927 compton events are a ssociated with this event.
  It was also clearly detected in the CsI anticoincidence (Veto) detector in the 1 00-500 keV energy range.
  CZTI GRB detections are reported regularly on the payload site at http://astrosa t.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes acr oss India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research O rganisation funded, managed and facilitated the project.
• GCN Circular #23646
  K. Hurley, on behalf of the IPN,
  I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team,
  A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team,
  A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
  S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team,
  and
  W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report:
  The long-duration GRB 190103A (AGILE (MCAL) detection: Ursi et al., GCN Circ. 23600; AstroSat (CZTI) detection: Khanam et al., GCN Circ. 23609) was detected by Konus-Wind, INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), AGILE (MCAL), AstroSat (CZTI), and Swift (BAT) at about 60113 s UT (16:41:53). The burst was outside the coded field of view of the BAT.
  We have triangulated it to a preliminary, 3-sigma error box whose coordinates are:

    ---------------------------------------------
     RA(2000), deg                 Dec(2000), deg
    ---------------------------------------------
    Center:
     251.409 (16h 45m 38s) +17.382 (+17d 22' 54")
    Corners:
     251.079 (16h 44m 19s) +18.134 (+18d 08' 01")
     251.470 (16h 45m 53s) +18.711 (+18d 42' 41")
     251.734 (16h 46m 56s) +16.622 (+16d 37' 21")
     251.342 (16h 45m 22s) +16.027 (+16d 01' 37")
    ---------------------------------------------
  

  The error box area is about 0.93 sq. deg, and its maximum dimension is 2.69 deg (the minimum one is 26.4 arcmin). The Sun distance was about 51 deg.
  This box may be improved.
  A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB190103_T60113/IPN/
  The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
• GCN Circular #23672
  A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline on behalf of the Konus-Wind team, report:
  The long-duration, intense GRB 190103A (AGILE/MCAL detection: Ursi et al., GCN 23600; AstroSat CZTI detection: Khanam et al., GCN 23609; IPN triangulation: Hurley et al., GCN 23646) triggered Konus-Wind at T0=60113.215 s UT (16:41:53.215).
  The burst light curve shows two emission episodes with a total duration of ~33 s. The emission is seen up to ~16 MeV.
  As observed by Konus-Wind, the burst had a fluence of 7.14(-0.65,+0.68)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0+21.648 s, of 2.00(-0.30,+0.32)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
  The time-integrated spectrum of the burst (measured from T0 to T0+32.512 s) is best fit in the 20 keV - 16 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.90(-0.07,+0.07), the high energy photon index beta = -2.41(-0.24,+0.16), the peak energy Ep = 304(-26,+28) keV, chi2 = 85/97 dof.
  The spectrum near the peak count rate (measured from T0+21.504 to T0+24.320 s) is best fit in the 20 keV - 3 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.76(-0.08,+0.09), the high energy photon index beta = -2.39(-0.31,+0.20), the peak energy Ep = 396(-46,+50) keV, chi2 = 49/62 dof.
  The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB190103_T60113/
  All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.