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Fermi/GBM photon spectra accumulated around 02:04:47 UT and 02:06:05 UT during the quoted 2-min interval on March 22, 2019 (left panel). Variable isothermal and thick target fitting was performed on the Fermi/GBM spectrum. For the variable thermal, we used the ‘vth’ function, and for thick target, we used ‘thick2’ from OSPEX. The variable thermal fit is shown by the red curve, and the thick target fit is shown by the blue curve. The fit is limited to between 8 and 30 keV shown by the shaded region. Above 30 keV, the counts are predominantly that of background. The fit shown here is the best fit obtained using χ2 as a measure. We find that a range of values for low-energy cutoff parameter (10.3−19.5 keV) gives reasonable fit. The electron spectrum given by the thick-target fit is shown in the right panel.
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