Title:              COMPTEL detection of two spatially-coincident
                    {gamma}-ray bursts.
Authors:            KIPPEN, R.M.; BENNETT, K.; CONNORS, A.; HANLON,
                    L.O.; HARRISON, T.E.; HERMSEN, W.; MCNAMARA, B.;
                    O'FLAHERTY, K.S.; PEDERSEN, H.; RYAN, J.;
                    SCHOENFELDER, V.; WINKLER, C.
Journal:            Astron. Astrophys. 293L, 5 1994.12.05 (1995)
Publication Date:   01/1995
Origin:             A&A via CDS
A&A Keywords:       GAMMA-RAY BURSTS
Abstract Copyright: (c) 1995: Astronomy & Astrophysics
Bibliographic Code: 1995A&A...293L...5K

Abstract

During nearly three years of operation, the COMPTEL instrument on the
Compton Gamma Ray Oservatory has localized 17 cosmic {gamma}-ray bursts in
the energy range 0.75-30MeV with average localization accuracy ~1.3deg. We
report here the COMPTEL detection of two bursts (GRB 930704 and GRB 940301),
occurring eight months apart, which are consistent with the same,
well-defined location within 1{sigma} uncertainties. Through Monte Carlo
simulation, we show that the probability of this spatial coincidence being
random is ~3%. Interplanetary Network (IPN) localization of these events
cannot rule out the possibility that they originate from a single source.
Furthermore, when COMPTEL and IPN localizations are combined, we show that
the random probability of two such overlapping bursts reduces to ~1.5%. We
discuss implications of this evidence of a possible repeating burst source.

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