Coincidences between the gravitational wave detectors EXPLORER and NAUTILUS in 1998, during the activities of the black hole candidate XTE J1550-564 and the magnetar SGR1900+14

摘要

The coincidence excess between the gravitational wave detectors EXPLORER and NAUTILUS observed in the ten-day period 7-17 September 1998 is the largest ever observed. The event occurred mainly at the sidereal hour 4, when the detectors axes were perpendicular to the Galactic disk. This excess occurred during a period of intense activity of the black hole candidate XTE J1550-564, and within days of the giant flare from the magnetar SGR1900+14.