MPE GRB-Science Dashboard

History - Detected GRBs per month


  • These pages contain localizations of GRBs detected with the Fermi Gamma-Ray Burst Monitor (GBM). These localizations are generated with the BALROG scheme ( Burgess et al. 2018, MNRAS 476, 1427).
  • BALROG fits the count data of the GBM detectors for spectrum and location on the sky simultaneously. This procedure allows us to get rid of the previous "3.7 deg core plus 10 deg tail" systematic error (Connaughton et al. 2015, ApJS 216, 32).
  • Our BALROG positions have a remaining systematic error of 2 deg when arriving from directions coincident with the spacecrafts solar panels, and 1 deg otherwise (Berlato et al. 2019, ApJ 873, 60). The BALROG code is available at

A few things are noteworthy:

  • These localizations are derived automatically via the procedure as described in sect. 7 of Berlato et al. 2019, without a human in the loop. Thus, mishaps can occur occasionally.
  • Since localizations are dependent on the emission spectrum, and our focus is on GRBs, we do not process terrestrial gamma-ray flashes (TGFs), and caution the accuracy of Soft Gamma Repeater (SGR) triggers and solar flares.
  • As more data are downloaded, there will be re-processing steps (again fully automatic). This can be recognized in the data_version column.
  • The script has been running since December 2018, and has been tuned since. We plan to re-process older GRBs with time, thus providing improved localizations also for older GRBs.
  • If you make use of these localizations or spectral parameters, we would appreciate a reference being made as "Retrieved from, Berlato et al. 2019, ApJ 873, 60".
  • The location and fit parameters can be retrieved as a formatted JSON from{grb_name}.
  • If you have any feedback, feature requests or bug reports please contact

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