Is there any evidence that high velocity neutron stars can produce burst-like behavior?
Yes, there is. Soft gamma-ray repeaters produce high energy transients whose durations overlap with those of gamma-ray bursts (see Figure 11), and whose characteristic spectral energies form a continuum with those of gamma-ray bursts (see Figure 12). The main distinction between soft gamma-ray repeaters and gamma-ray bursters is that the former have been clearly shown to repeat on time scales of days to years (Mazets et al. 1979, Laros et al. 1987, Atteia et al. 1987), whereas the latter have been thought not to repeat. But recently, a number of scientists have found strong evidence that gamma-ray bursters also repeat (Quashnock and Lamb 1993b, 1994; Wang and Lingenfelter 1993, 1995; Strohmayer, Fenimore, and Mirales 1994; Quashnock 1995). I will discuss the evidence for gamma-ray burst repeating in §IX. Three soft gamma-ray repeaters are known. Two lie in the Galactic disk at distances of 10’s of kpc (SGRs 1806-20 and 1900+14); the third lies in in the Large Magellanic Cloud in the ha
