LIGO detectors, in the US, and the European Advanced Virgo detector, in Italy, detected a signal, labeled GW190425. . This is the second observation of a gravitational wave consistent with the merger of a binary neutron star system (BNS) behind the GW170817 signal . GW190425 was detected at 08:18:05 UTC (universal coordinated time); approximately 40 minutes later, the LIGO Scientific Collaboration and the Virgo Collaboration sent out an alert to trigger follow-up observations by other telescopes. “We have detected a second event consistent with a BNS and this is an important confirmation for GW170817, the event that kicked off multi-messenger astronomy two years ago. The total mass is greater than that of any known BNS,

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this has interesting astrophysical implications for the formation of this system, ”says Jo van den Brand, spokesperson for the Virgo Collaboration and professor at Maastricht Tokelau Email List University, Nikhef and VU University. Amsterdam in the Netherlands. “What is surprising is that the combined mass of this binary system is much greater than expected,” adds Ben Farr, a member of the LIGO team at the University of Oregon, in the US. The results have been presented at the congress of the American Astronomical Society (AAS) in Honolulu, Hawaii. The source of GW190425 is estimated to be at a distance of 500 million light-years from Earth. It is located in the sky in an area about 300 times larger than that provided for the SNB observed by LIGO and

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Virgo in 2017, the famous GW170817. This is because the GW190425 signal was only detected with a high signal-to-noise ratio by LIGO-Livingston. At that time, the LIGO-Hanford detector was temporarily inoperative, while the reconstructed signal in Virgo was weak, due to the difference in sensitivity with respect to LIGO-Livingston, and also because of the probable direction of origin of the signal, a region of the sky in which Virgo has less sensitivity at the moment of reception of the signal. This lower precision in the location in the sky makes it very difficult to search for counterparts (electromagnetic signals, neutrinos or charged particles). In fact, unlike GW170817, no counterpart has been found to date. However, the Virgo data has subsequently

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