|Title||A fundamental test of the fireball model for GRBs|
|Author||Dr Rhaana Starling|
|Description||The most extreme GRBs radiate equivalent isotropic energies close to 10^54 erg; energies which cannot be accommodated in core-collapse models. Thus GRBs are thought to be narrowly beamed, which should give rise to an achromatic light curve break as the outflow slows and the Doppler beaming angle becomes of the same order as the jet opening angle. However, observations with Swift suggest such jet breaks are absent, leading to concerns about the total energetics which may undermine the entire GRB paradigm. We seek XMM-Newton observations to test for the absence of breaks in the X-ray light curves of two highly energetic GRBs. If even one is found with no break at late times, then the whole class of core-collapse models for GRBs will be thrown into serious doubt.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations.
Since Earth's atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2009-10-01T00:00:00Z, 055597, 17.56_20190403_1200. https://doi.org/10.5270/esa-dap6com|