This is the Analysis page for GRB230307656: GRB230307656

Version History of Data Files: v01 h01

GRB Properties

Parameters calculated by MPE

Property Value Error (1 σ statistical)
Trigger Number
Trigger Time March 07, 2023, 15:44:06
Data Timestamp March 07, 2023, 17:12:46
Localization Timestamp March 08, 2023, 09:08:39
Balrog Ra [deg] 41.8 0.4
Balrog Dec [deg] -71.5 0.1
Error radius 1 σ [deg] 0.3
Error radius 2 σ [deg] 0.4
Estimated systematic error [deg] 2
Fitted Model cutoff_powerlaw
Spectral Parameter K [photons/cm^2/keV*s] 16 0.39
Spectral Parameter Index -0.46 0.0048
Spectral Parameter XC [keV] 6e+02 4
Satellite Phi [deg] 133.83
Satellite Theta [deg] -54.92

Parameters from external Source

Property Value
Swift Ra [deg]
Swift Dec [deg]
Most likely None None%
Second most likely None None%

GRB Location Alert

GRB 230307A: BALROG localization (Fermi Trigger 699896651/ GRB 230307656)

B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
699896651 at 15:44:06 on 07 March 2023 were fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).

The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 41.8+/-0.4 deg
Decl.(2000.0) = -71.5+/-0.1 deg
We estimate an additional systematic error of 2 deg.

The position is in agreement with the IPN localization (GCN Circ. 33413).

We note that the determined localization is close to the Earth horizon, which could be an additional source of systematic errors.

Further details are available at:

The Healpix map can be downloaded from:

The location parameters are available as JSON at:

GRB Location

J2000 Coordinate Frame

All Corner Plot

J2000 Coordinate Frame

Moll Location Plot

J2000 Coordinate Frame


Spectrum Residuals Plot

3D - GRB Location Plot

Satellite Coordiante Frame

Light Curves

Lightcurve detector b0
Lightcurve detector b1
Lightcurve detector n0
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Lightcurve detector n2
Lightcurve detector n3
Lightcurve detector n4
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Lightcurve detector n7
Lightcurve detector n8
Lightcurve detector n9
Lightcurve detector na
Lightcurve detector nb