A new definition of the intermediate group of gamma-ray bursts
arXiv:astro-ph/0509909 · doi:10.1051/0004-6361:20041129
Abstract
Gamma-ray bursts can be divided into three groups ("short", "intermediate", "long") with respect to their durations. This classification is somewhat imprecise, since the subgroup of intermediate duration has an admixture of both short and long bursts. In this paper a physically more reasonable definition of the intermediate group is presented, using also the hardnesses of the bursts. It is shown again that the existence of the three groups is real, no further groups are needed. The intermediate group is the softest one. From this new definition it follows that 11% of all bursts belong to this group. An anticorrelation between the hardness and the duration is found for this subclass in contrast to the short and long groups. Despite this difference it is not clear yet whether this group represents a physically different phenomenon.
accepted for publication in Astronomy and Astrophysics
References in corpus (1)
Cited by in corpus (35)
- The Fourth Fermi-GBM Gamma-Ray Burst Catalog: A Decade of Data
- Quasi-blackbody component and radiative efficiency of the prompt emission of gamma-ray bursts
- Time-Resolved Spectroscopy of the 3 Brightest and Hardest Short Gamma-Ray Bursts Observed with the FGST Gamma-Ray Burst Monitor
- GRB 060313: A New Paradigm for Short-Hard Bursts?
- Classification of Swift's gamma-ray bursts
- An analysis of the durations of Swift Gamma-Ray Bursts
- The faint afterglow and host galaxy of the short-hard GRB 060121
- GRB 060121: Implications of a Short/Intermediate Duration Gamma-Ray Burst at High Redshift
- Testing the Randomness in the Sky-Distribution of Gamma-Ray Bursts
- Classification of BeppoSAX's Gamma-Ray Bursts
- Gaussian-mixture-model-based cluster analysis of gamma-ray bursts in the BATSE catalog
- Revisiting the characteristics of the spectral lags in short gamma-ray bursts
- The Swift satellite and redshifts of long gamma-ray bursts
- Some statistical remarks on the Giant GRB Ring
- Spectroscopy and multiband photometry of the afterglow of intermediate duration gamma-ray burst 040924 and its host galaxy
- A Comparative Study of Long and Short GRBs. II. A Multi-wavelength Method to distinguish Type II (massive star) and Type I (compact star) GRBs
- Distinction of groups of gamma-ray bursts in the BATSE catalog through fuzzy clustering
- Multivariate analysis of BATSE gamma-ray burst properties using skewed distributions
- Two Dimensional Classification of the Swift/BAT GRBs
- On the Connection of Gamma-Ray Bursts and X-Ray Flashes in the BATSE and RHESSI Databases
- GRB 180418A: A possibly-short GRB with a wide-angle outflow in a faint host galaxy
- GRB Optical and X-ray Plateau Properties Classifier Using Unsupervised Machine Learning
- Graph-based clustering of gamma-ray bursts
- Multidimensional analysis of Fermi GBM gamma-ray bursts
- Astrophysics in 2006
- Statistical properties of Fermi GBM GRBs' spectra
- Factor analysis of the long gamma-ray bursts
- Can the Cosmological Dilation Explain the Skewness in the Gamma-Ray Burst Duration Distribution?
- Differential Source Count for Gamma Ray Bursts
- Distribution of gamma-ray bursts on the t90-hardness ratio plane and their classification revisited
- How does the shape of gamma-ray bursts' pulses affect the duration distribution?
- Analysis of the Swift Gamma-Ray Bursts duration
- Classification of Fermi Gamma-RAY Bursts
- Search for Cosmological time dilation from Gamma-Ray Bursts -- A 2021 status update
- Redshift and spatial distribution of the intermediate gamma-ray bursts