Gamma-ray bursts (GRBs) are the most powerful explosions the Universe has seen since the Big Bang. They occur approximately once per day and are brief, but intense, flashes of gamma radiation. They come from all different directions of the sky and last from a few milliseconds to a few hundred seconds. So far scientists do not know what causes them. Do they signal the birth of a black hole in a massive stellar explosion? Are they the product of the collision of two neutron stars? Or is it some other exotic phenomenon that causes these bursts?
With Swift, a NASA mission with international participation, scientists have a tool dedicated to answering these questions and solving the gamma-ray burst mystery. Its three instruments give scientists the ability to scrutinize gamma-ray bursts like never before. Within seconds of detecting a burst, Swift relays its location to ground stations, allowing both ground-based and space-based telescopes around the world the opportunity to observe the burst's afterglow. Swift is part of NASA's medium explorer (MIDEX) program and was launched into a low-Earth orbit on a Delta 7320 rocket on November 20, 2004. The Principal Investigator is Dr. Brad Cenko (NASA-GSFC).
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About a year ago, astronomers excitedly reported the first detection of electromagnetic waves, or light, from a gravitational wave source. Now, a year later, researchers are announcing the existence of a cosmic relative to that historic event. GRB150101B was a gamma-ray burst that lasted less than a second, localized by the NASA's Neil Gehrels Swift Observatory in an old elliptical galaxy 1.7 billion years away. The apparent match between GRB 150101B and GW170817 is striking: both produced an unusually faint and short-lived gamma ray burst, and both were a source of bright, blue optical light lasting a few days, and X-ray emission lasted much longer. The host galaxies are also remarkably similar. Both are bright elliptical galaxies with a population of stars a few billion years old and displaying no evidence for new stars forming. A paper reporting the results was published today in Nature Communications.
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The Ultraviolet/Optical Telescope (UVOT) aboard the Neil Gehrels Swift Observatory captured its millionth image on May 13, 2018. It took an image of an active galaxy called 2MASX J16110570+0234002, which scientists think exhibited some unusual behavior. A mosaic, created using images UVOT has taken since Swift launched in 2004, celebrates this major milestone for the mission.
Using data from NASA's Neil Gehrels Swift Observatory and ESA's XMM-Newton, researchers found evidence of an unusual long decay of X-ray emission coming from the active galaxy GSN 069. The X-ray signal was first seen in July 2010 by XMM-Newton. These observations showed that the source became at least 240 times brighter in X-rays. Since this initial detection, Swift and XMM-Newton observed GSN 069 multiple times and caught the long decay behavior of this outburst spanning about a decade. The X-ray data also indicate that the X-ray spectra are ultra-soft, i.e. steeply decreasing towards higher energies. All these properties point to a rare long-lived tidal disruption event (TDE). A few dozen of these events are known, but are mostly short-lived. The unusual long decay of the X-ray signal in GSN 069 suggests that either this was a late stage of evolution from a typical TDE, or the rare case where a long sustained TDE was caught in a galaxy with a pre-existing AGN. A paper describing these results was published in the journal Astrophysical Journal Letters.
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