Critical Test Of Gamma Ray Burst Theories

Long and precise follow-up measurements of the X-ray afterglow (AG) of very intense gamma ray bursts (GRBs) provide a critical test of GRB afterglow theories.

Dado & Dar (2016) show that the power-law decline with time of X-ray AG of GRB 130427A, the longest measured X-ray AG of an intense GRB with the Swift, Chandra and XMM Newton satellites, and of all other well measured late-time X-ray afterglow of intense GRBs, is that predicted by the cannonball (CB) model of GRBs from their measured spectral index, while it disagrees with that predicted by the widely accepted fireball (FB) models of GRBs.

Dado & Dar 2016 (preprint) - Critical Test Of Gamma Ray Burst Theories - (arXiv)

NO CORRELATION BETWEEN FERMI GBM SIGNAL AND GW150914

Image: Merging black holes. Credit: NASA Recently it has been suggested that electromagnetic signals detected by Fermi GBM could be associated with the merger of the two black holes detected by LIGO ( GW150914 ).

TELESCOPES COMBINE TO PUSH FRONTIER ON GALAXY CLUTERS

Credit: NASA, ESA, CXC, NRAO/AUI/NSF, STScI, R. van Weeren (Harvard-Smithsonian Center for Astrophysics), and G. Ogrean (Stanford University) Hubble News Located about 4.3 billion light-years from Earth, MACS J0416 is a pair of colliding galaxy clusters that will eventually combine to form an even bigger cluster.

SpaceTime

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