The Fermi-GBM Gamma-Ray Burst Spectral Catalog: 10 yr of Data

Abstract

We present the systematic spectral analyses of gamma-ray bursts (GRBs) detected by the Fermi Gamma-Ray Burst Monitor during its first ten years of operation. This catalog contains two types of spectra: time-integrated spectral fits and spectral fits at the brightest time bin, from 2297 GRBs, resulting in a compendium of over 18,000 spectra. The four different spectral models used for fitting the spectra were selected based on their empirical importance to the shape of many GRBs. We describe in detail our procedure and criteria for the analyses, and present the bulk results in the form of parameter distributions both in the observer frame and in the GRB rest frame. 941 GRBs from the first four years have been refitted using the same methodology as that of the 1356 GRBs in years five through ten. The data files containing the complete results are available from the High-Energy Astrophysics Science Archive Research Center.

Cosmological Fast Optical Transients with the Zwicky Transient Facility: A Search for Dirty Fireballs

“…The cumulative distributions of the prompt energetics are shown in Figure 8. For comparison, we show the distribution of GRBs in the Fermi -GBM Burst Catalog 25 (Gruber et al 2014;von Kienlin 2014;Narayana Bhat et al 2016;von Kienlin et al 2020;Poolakkil et al 2021), and LGRBs from Konus-Wind with redshift measurements (Tsvetkova et al 2017). The sample size is too small to discern statistically significant differences.…”

GRB Polarization: A Unique Probe of GRB Physics

“…Since a significant fraction of GRBs show low-energy spectral indices that are harder than this value, it might indicate that another spectral component is possibly contributing at low energies and offsetting the spectral slope. Second, the spectral peak energy in the cosmological rest-frame of the source is given by E m (1 + z), which depends on a combination of Γ, γ m , and B to yield the measured peak energy in the range 200 keV [E pk,z = E pk (1 + z)] 1 MeV [97] with a possible peak around E pk,z ∼ m e c 2 [98]. Given that all of these quantities can vary substantially between different bursts, the synchrotron model does not offer any characteristic energy scale at which most of the energy is radiated in the event that the E pk,z distribution indeed narrowly peaks around ∼ m e c 2 [99].…”

Detection prospects for multi-GeV neutrinos from collisionally heated GRBs

“…I), we decided to include a median correction in our analysis. In order to do so, we collected all the kcorrections calculated based on the GRB sample observed by Fermi -GBM during the first ten years of its operation and with known redshift (∼4.5% out of the total sample) [72] and computed the median value of such a distribution. Then, each time a value of gamma-ray fluence was extracted in a synthetic GRB of the sample, this was k-corrected with the median of such distribution, i.e.…”

“…In principle, different k-corrections should be applied to the two samples of LGRBs and SGRBs, because these manifestly show different spectral slopes of the emitted prompt radiation. However, the Fermi -GBM sample from which the k-correction is extracted [72] is quite limited: it contains only sources with known redshift (amouting to 13 SGRBs and 122 LGRBs). As a result, the sample of SGRBs for which the k-correction has been evaluated is not statistically relevant to derive c Fermi-GBM catalogue: https://heasarc.gsfc.nasa.gov/ W3Browse/fermi/fermigbrst.html.…”