Fermi LAT detection of a new enhanced gamma-ray emission from the Crab Nebula region

Details Fermi LAT detection of a new enhanced gamma-ray emission from the Crab Nebula region Fermi LAT detection of a new enhanced gamma-ray emission from the Crab Nebula region

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3276....1b&link_type=abstract

The Astronomer's Telegram, #3276

Astronomy and Astrophysics

Astronomy

6

Gamma Ray, >Gev, Neutron Star, Transient, Pulsar

Scientific paper

The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed a renewed increase of the gamma-ray activity from a source positionally consistent with the Crab Nebula in the period April 9-11, 2011. Preliminary LAT analysis indicates that the gamma-ray emission (E >100 MeV) observed at the location of the Crab Nebula started to increase on 9 April with a flux of (4.7 ± 0.6) x10-6 ph/cm2/sec (only statistical errors are given), and a peak in the period between 2011-04-11 05:59:58 UT and 2011-04-11 23:44:56 UT of (5.7 ± 0.7) x10-6 ph/cm2/sec, corresponding to an increase of a factor of 2 with respect to the average flux from the direction of the Crab nebula of (2.9 ± 0.1) x10-6 ph/cm2/sec, estimated for the entire Fermi operation period.

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