Fig. 2: Spectral fitting within the 8 − 30 s time interval.
From: Probable evidence for a transient mega-electron volt emission line in the GRB 221023A
The counts rate spectrum in the panel a and the νFν spectrum in the panel b are obtained from fitting the Band function. Data are from GBM's two sodium iodide (NaI) detectors (n0: dark purple, n1: blue) and one BGO detector (b0: light cyan-green). The narrow feature appears as an excess around 1 MeV–3 MeV in the b0 detector data. Panels c and d show the same spectra fitted with the Band function plus a Gaussian component to model the observed excess. Error bars indicate the 1σ uncertainty on data points. Source data are provided as a Source Data file.
