as tr o - ph / 9 50 40 10 4 A pr 1 99 5 DO GAMMA - RAY BURST SOURCES REPEAT ?
نویسندگان
چکیده
The demonstration of repeated gamma-ray bursts from an individual source would severely constrain burst source models. Recent reports (Quashnock & Lamb 1993; Wang & Lingenfelter 1993) of evidence for repetition in the rst BATSE burst catalog have generated renewed interest in this issue. Here, we analyze the angular distribution of 585 bursts of the second BATSE catalog (Meegan et al. 1994). We search for evidence of burst recurrence using the nearest and farthest neighbor statistic and the two-point angular correlation function. We nd the data to be consistent with the hypothesis that burst sources do not repeat; however, a repeater fraction of up to about 20% of the observed bursts cannot be excluded.
منابع مشابه
as tr o - ph / 9 50 70 66 17 J ul 1 99 5 GAMMA - RAY BURST ENERGY SPECTRA :
The modelling of gamma-ray burst (GRB) spectra has considerable potential for increasing the understanding of these enigmatic sources. A diversity of ideas and analyses has been generated over the last two decades to explain line features and continuum shapes, encompassing both older galactic neutron star and \new age" cosmological source models. This paper reviews some of the highlights of the...
متن کاملar X iv : a st ro - p h / 93 08 00 7 v 1 5 A ug 1 99 3 DO GAMMA - RAY BURST SOURCES REPEAT ?
Following the discovery by Quashnock and Lamb (1993) of an apparent excess of γ-ray burst pairs with small angular separations, we reanalyze the angular distribution of the bursts in the BATSE catalogue. We find that in addition to an excess of close pairs, there is also a comparable excess of antipodal bursts, i.e pairs of bursts separated by about 180 degrees in the sky. Both excesses have on...
متن کاملas tr o - ph / 9 50 40 96 27 A pr 1 99 5 baryon and the Geometry of Intermediate RedshiftLyman Absorption
Estimates of baryon from primordial nucleosynthesis together with standard assumptions about the ionization state of low column density Ly forest clouds can be used to determine an upper limit for the cloud thickness along the line of sight. This upper limit provides signiicant constraints on the axis ratio of the absorbers and on the overall fraction of the baryonic matter contained in these o...
متن کاملDo Gamma-ray Burst Sources Repeat?
The demonstration of repeated gamma-ray bursts from an individual source would severely constrain burst source models. Recent reports (Quashnock and Lamb 1993; Wang & Lingenfelter 1993; Ryan et al. 1994) of evidence for repetition in the first BATSE burst catalog have generated renewed interest in this issue. Here, we analyze the angular distribution of 585 bursts of the second BATSE catalog (M...
متن کاملar X iv : 0 80 4 . 30 17 v 1 [ as tr o - ph ] 1 8 A pr 2 00 8 Gamma Rays from Centaurus A
Centaurus A, the cosmic ray accelerator a few Mpc away from us is one of the nearest sources of extremely high energy cosmic rays. It would be interesting to see whether the gamma ray data currently available from Centaurus A in the GeV-TeV energy band can be explained with only proton proton interactions. We show that to be consistent with the gamma ray luminosity observed in the GeV-TeV energ...
متن کامل