Burst Catalog Research Articles

Evidence for two distinct morphological classes of gamma-ray bursts from their short time scale variability

We have analyzed the 241 bursts for which peak counts (C)max exist in the publicly available Burst and Transient Source Experiment (BATSE) catalog. Introducing peak counts in 1024 ms as a measure of burst brightness B and the ratio of peak counts in 64 and 1024 ms as a measure of short timescale variability V, we find a statistically significant correlation between the brightness and the short time scale variability of gamma-ray bursts. The bursts which are smoother on short time scales are both faint and bright, while the bursts which are variable on short time scales are faint only, suggesting the existence of two distinct morphological classes of bursts.

Angular clustering properties of gamma-ray bursts and quantitative constraints on their distances

Upper limits on the angular correlation function, w(theta), of gamma-ray bursts are obtained which constrain the sources to be very nearby or very distant. The angular clustering properties of the sources in two recent gamma-ray burst catalogs (Golenetskii et al., 1986 and Atteia et al., 1987) have been derived by determining their two-point w(theta) values, and the correlations of both data sets are consistent with w(theta) = 0. It is shown that if the spatial correlation of gamma-ray bursts resembles that of galaxies or galactic clusters, present gamma-ray burst catalogs must be complete to distances in excess of 100 Mpc, while if gamma-ray bursts are associated with a Galactic disk population, then the upper limits on w(theta) constrain the sampling depth to less than two disk scale heights.

A second catalog of gamma-ray bursts - 1978-1980 localizations from the interplanetary network

A catalog of 84 gamma-ray bursts which occurred between September 14, 1978 and February 13, 1980 is presented. The data presented consist of earth crossing times, given to about the nearest second, and time histories, in the tens of keV to MeV range, for all 84 events, as well as localizations for 80 of the events. The localizations, derived from arrival-time analysis, are given as single error boxes, double error boxes, or annuli of location, and, where possible, have been compared to the Konus localizations. They range in size from less than a square arcminute to over 1000 square degrees. The fluences of the bursts cataloged are in the range 3 x 10 to the -7th ergs/sq cm and above.

Analysis of the KONUS catalog of gamma-ray bursts with the thermal synchrotron model

Approximately 150 reported gamma-ray burst spectra of the Konus catalog are analyzed using the thermal synchrotron model. An overwhelming majority of these spectra can be satisfactorily fitted by theoretical thermal synchrotron spectra of mildly relativistic electrons in strong magnetic fields, making the strong-field neutron star picture at least self-consistent. Valuable additional information is also extracted from various spectral features contained in many of the events.

A reply to ?comments on the gamma-ray burst catalog? of Laroset al.

A reply to ?comments on the gamma-ray burst catalog? of Laroset al.

Comments on the gamma-ray burst catalog of Mazetset al. (1981a)

We have discovered a correlation between the Venera spacecraft locations and the gamma-ray burst positions reported in the KONUS catalog (Mazetset al., 1981a). The reason for the correlation is not clear, but it could be due to spatial selection effects and/or large localization errors for weak of soft bursts. Whatever the cause, it seems likely that this systematic bias might significantly affect catalog results pertaining to gamma burst locations, intensity distributions, and spectra. For example, it can explain why the KONUS galactic latitude distribution is peaked significantly south of the galactic equator. Apparent discrepancies between the KONUS and Los Alamos gamma burst data bases are noted.

A catalog of gamma-ray bursts with earth crossing times

A catalog of 111 confirmed gamma-ray bursts detected between 1967 July and 1979 June is presented. Both localization information and earth crossing times for the gamma-ray wave fronts are given. Data which have appeared in some previous catalogs have been revised; many previously unpublished events detected by an international network of dedicated deep space and near-earth experiments since 1976 are also presented.

Catalog of cosmic gamma-ray bursts from the KONUS experiment data

In the third part of the Catalog, the observational data are presented on the gamma-burst studies in the KONUS experiment aboard Venera 11 and Venera 12 spacecraft in the period from the end of May to October 1979. The burst time profiles, energy spectra and source localization data are given.

Catalog of cosmic gamma-ray bursts from the KONUS experiment data

In the third part of the Catalog, the observational data are presented on the gamma-burst studies in the KONUS experiment aboard Venera 11 and Venera 12 spacecraft in the period from the end of May to October 1979. The burst time profiles, energy spectra and source localization data are given.

Catalog of cosmic gamma-ray bursts from the KONUS experiment data

The fourth and concluding part of the Catalog contains information on 20 gamma-ray bursts detected in the KONUS experiment on the Venera space probes from November 1979 up to the beginning of February 1980. The time profiles, energy spectra and source localization data are presented. A review of the major scientific results obtained is given.

Catalog of cosmic gamma-ray bursts from the KONUS experiment data

Catalog of cosmic gamma-ray bursts from the KONUS experiment data

A catalog of solar radio bursts 1966-1976 having spectral characteristics predictive of proton activity

A table of 81 distinctive solar radio outbursts occurring between January 1966 and July 1976 is presented. All of the bursts have the peak flux density U-shaped spectral signature found to be a reliable predictor of proton activity. These are the only events with this signature which occurred during the period. It has been confirmed that proton emission was indeed associated with 79 of the bursts; proton emission is probable for the remaining two events.