Rare long gamma ray bursts caused by supergiant star's death, says researchers
There are two types of gamma-ray bursts: short and long. The short GRBs last a very short duration, a maximum of two seconds but sometimes even less.
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Apr 17, 2013
It did not give the distance and absolute magnitude of the visible light flare that would have followed on from the GRB.
Should be a better result when these bits appear in the report.
An interesting feature of short versus long duration GRBs is the precession rate of the stellar core. As most very massive supergiant stars are caused by collision and merger, the size of the colliding stars has a significant effect on the precession rate.
For the vast number of near transparent population 1 subdwarves the result is a star precessing in "disco mode" in all 3 axes. The GRB & jets are gamma ray lasers with a small cross section of about Jupiter diameter or so and will sweep across the observer in a very short time as a result.
For the stars created out of merger of a binary pair of EB type with a distant companion driving a merger, the precession rate becomes very slow and generally locked to an orbital plane. the result in that case is a long busts looked at down the pole with a long time before the polar jet is precessed out of the way. The possibility here is that precession of the GRB burst in that case may in fact be a feature of the orbital motion of the star which swung out of view as a result of orbital motion with a companion.
The record event appears to result from a merged binary in a VERY long orbit with the star seen pole on from initiation until the star became a an accretion disc and a drag & spin magnetically bound ring. Those events last as long as it takes for the merger remnant behaving as a single star to lose its accretion disc down the event horizon & form a small star @ the inner part of the drag & spin disc. Result will be a classic black hole low mass X ray binary with companion anywhere from red dwarf to blue main sequence dwarf with high metallicity having been made out of the equatorial outer layers of the progenitor star.
Short duration GRBs outnumber long duration events indicating that the bulk are a result of a collision and merger supergiant in a dense low mass cluster finally undergoing a core collapse into a black hole. Most of these are likely now the intermediate mass black holes of dense globular clusters such as M15 and Omega centauri.
Have a nice day: Ag
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