after LIGO’s detection,
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, Fermi recorded a very faint flash of gamma rays. “We’d normally never pick it out of the data,
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,” she says. Researchers can’t pinpoint precisely where the burst came from,
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, but the direction is roughly consistent with LIGO’s.
If the black hole collision did blast out gamma rays,
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, theorists are going to have some explaining to do. Merging black holes shouldn’t release any electromagnetic radiation. It’s only when neutron stars get involved that telescopes should see flashes of light. During a recent phone call with colleagues about the Fermi data, “the theorists were already arguing with each other,
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,” Connaughton says.
But before the theorists get too worked up,
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, researchers need to figure out if what Fermi saw had anything to do with LIGO’s black holes. “We’re definitely not saying we saw an [electromagnetic] counterpart,
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,” says Connaughton. It could be just a coincidence. During nearly 67 hours of observing in September,
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, Fermi saw 27 similar gamma ray bursts. The only way to be certain is to wait for more LIGO detections. “If it’s real, it’s not going to be a one-off,” she says.
LIGO’s debut detection appeared during a test run in September; researchers are currently analyzing LIGO data accumulated during the four months that followed, and another science run is planned for later this year. The team is optimistic about their chances of finding more events. LIGO could have sensed a collision between two 30-solar-mass black holes out to about 6 billion light-years away. Given that researchers found one (so far) in 16 days of data,
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