Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 775, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/775/2/L37
Keywords
gamma rays: stars; ISM: supernova remnants; pulsars: individual (Crab); radiation mechanisms: non-thermal
Categories
Funding
- NASA [NNH10ZDA001N, 41213]
- NASA Postdoctoral Program at the Goddard Space Flight Center
- NRL [NASADPRS-15633-Y]
- Istituto Nazionale di Astrofisica in Italy
- Centre National dEtudes Spatiales in France
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We report on a bright flare in the Crab Nebula detected by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. The period of significantly increased luminosity occurred in 2013 March and lasted for approximately two weeks. During this period, we observed flux variability on timescales of approximately 5 hr. The combined photon flux above 100 MeV from the pulsar and its nebula reached a peak value of (12.5 +/- 0.8) . 10(-6) cm(-2) s(-1) on 2013 March 6. This value exceeds the average flux by almost a factor of six and implies a similar to 20 times higher flux for the synchrotron component of the nebula alone. This is the second brightest flare observed from this source. Spectral and temporal analysis of the LAT data collected during the outburst reveal a rapidly varying synchrotron component of the Crab Nebula while the pulsar emission remains constant in time.
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