🌌 NASA Astronomy Picture of the Day
Gamma Ray Bursts from the Unknown Credit:
Date: 1996-11-23

Explanation:
Gamma Ray Bursts (GRBs) pose one of the greatest
mysteries of modern astronomy. About once a day, the gamma-ray sky
lights up with a spectacular explosion. No one knows what causes
these explosions or even how far away they are. The above map
represents the entire sky in coordinates
centered on our Galaxy, the Milky Way.
It shows the positions of over 800 of these mysterious bursts
of energy detected by the BATSE
instrument on board NASA's Compton Gamma Ray Observatory.
Before BATSE, most astronomers thought that most GRBs
occurred in the disk of our Galaxy, but the above sky map shows
little sign of this. The distance scale of GRBs
was the topic of a historic debate
in April 1995. The positions in the above map are currently being
studied in great detail in an effort to uncover a clue about the
nature of GRBs.
In the above 3B
map created by R. Nemiroff, spot size is proportional to peak
flux and spot color is indicative of hardness.







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