Gamma-ray Burst 191130A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Circular #26327
  D. M. Palmer (LANL), A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
  At 13:05:02 UT on 2019-11-30, GRB 191130A occurred during a preplanned slew of the Neil Gehrels Swift Observatory and was later found in the Swift/BAT ground analysis.
  Using the data set from T-139 to T+106 sec from the recent telemetry downlink (observation ID: 03110538005), the BAT ground-calculated position is RA, Dec = 133.137, 5.017 deg which is

     RA(J2000)  =  08h 52m 32.9s
     Dec(J2000) = +05d 01' 02.1"
  

  with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
  The mask-weighted light curve shows a single-pulse structure that starts at ~T0, peaks at ~T+7 s, and ends at ~T+22 s. T90 (15-350 keV) is 17.6 +- 2.9 sec (estimated error including systematics).
  The time-averaged spectrum from T-0.0 to T+22.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.95 +- 0.13. The fluence in the 15-150 keV band is 6.86 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+6.18 sec in the 15-150 keV band is 1.1 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
  The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/BATbursts/GRB191130A/03110538005/bascript/top.html
• GCN Circular #26331
  P. A. Evans (U. Leicester) reports on behalf of the Swift team:
  Swift has initiated a ToO observation of the Swift/BAT GRB 191130A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00020950
  Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Swift/BAT event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
  Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
  This circular is an official product of the Swift-XRT team.
• GCN Circular #26346
  B. Sbarufatti (PSU) ), J. D. Gropp (PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
  Swift-XRT has performed follow-up observations of the Swift/BAT-detected burst GRB 191130A (Palmer et al. GCN Circ. 26327), collecting 5.0 ks of Photon Counting (PC) mode data between T0+310.0 ks and T0+343.5 ks.
  Three uncatalogued sources were detected, all of them too far from the GRB position to be likely afterglow candidates.
  The 3-sigma upper limit at the BAT position is 1.19e-3 ct s^-1, corresponding to a 0.3-10 keV observed flux of 6.0e-14 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
  The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00020950.
  This circular is an official product of the Swift-XRT team.