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Einstein Probe Reveals Hidden Prolonged Soft X-Ray Phase in Neutron Star Mergers

China's Einstein Probe detected nearly 10 minutes of soft X-ray emission following a short gamma-ray burst (GRB 250704B) from a neutron star merger 6–7 billion light-years away, far longer than standard models predict and invisible to gamma-ray-focused instruments.

DARKCOMDA
1 Source, 3d ago, first seen 3d ago

TLDR

This discovery challenges existing models of short gamma-ray bursts and neutron star mergers, suggesting many past events had undetected extended emission phases. The findings could improve connections to gravitational-wave detections, reveal properties of ultra-dense matter in merger remnants, and explain some fast X-ray transients. Einstein Probe's unique wide-field soft X-ray capability uncovered physics that previous instruments missed, advancing multi-messenger astronomy and opening new avenues for studying these explosive cosmic events that produce heavy elements like gold.

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1 Source, first seen 3d ago

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Combined views

1.6K

1 Source, first seen 3d ago

1 likes1 reposts

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1 Source

DARKCOM@DARKCOMBUZZA gamma-ray burst from a likely neutron star merger lasted only about 0.4 seconds, but Einstein Probe kept seeing soft X-rays from the source for nearly 10 minutes. That gap changes how the event can be read. The merger was not simply a brief flash followed by silence. Its central engine appears to have kept releasing energy, while the softer emission may have been missed in earlier events because conventional gamma-ray instruments were not sensitive enough to it. Einstein Probe is effectively adding a longer chapter to a phenomenon we used to see only in its opening seconds. The flash was only the beginning.3d
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    1 Source

    DARKCOM@DARKCOMBUZZA gamma-ray burst from a likely neutron star merger lasted only about 0.4 seconds, but Einstein Probe kept seeing soft X-rays from the source for nearly 10 minutes. That gap changes how the event can be read. The merger was not simply a brief flash followed by silence. Its central engine appears to have kept releasing energy, while the softer emission may have been missed in earlier events because conventional gamma-ray instruments were not sensitive enough to it. Einstein Probe is effectively adding a longer chapter to a phenomenon we used to see only in its opening seconds. The flash was only the beginning.3d
    Today's Rank

    #11

    Today's Rank

    #11