Fermi LAT confirmation of enhanced gamma-ray emission from the Crab Nebula region

Details Fermi LAT confirmation of enhanced gamma-ray emission from the Crab Nebula region Fermi LAT confirmation of enhanced gamma-ray emission from the Crab Nebula region

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2861....1b&link_type=abstract

The Astronomer's Telegram, #2861

Astronomy and Astrophysics

Astronomy

11

>Gev, Pulsars

Scientific paper

Following the detection by AGILE of increasing gamma-ray activity from a source positionally consistent with the Crab Nebula occurred from September 19 to 21 (ATel #2855), we report on the analysis of the >100 MeV emission from this region with the Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope. Preliminary LAT analysis indicates that the gamma-ray emission (E >100 MeV) observed during this time period at the location of the Crab Nebula is (606 +/- 43) x10^-8 ph/cm2/sec, corresponding to an excess with significance >9 sigma with respect to the average flux from the Crab nebula of (286 +/- 2) x10^-8 ph/cm2/sec, estimated over all the Fermi operation period (only statistical errors are given).

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