We search the Fermi Large Area Telescope (LAT) photon data base for an extended gamma-ray emission which could be associated with any of the 581 previously detected gamma-ray bursts (GRBs) visible to the Fermi-LAT. For this purpose, we compare the number of photons with energies E > 100MeV and E > 1 GeV which arrived in the first 1500 s after the burst from the same region, to the expected background. We require that the expected number of false detections does not exceed 0.05 for the entire search and find the high-energy emission in 19 bursts, four of which (GRB 081009, GRB 090720B, GRB 100911 and GRB 100728A) were previously unreported. The first three are detected at energies above 100 MeV, while the last one shows a statistically signi...
Since the launch of the Fermi Gamma-ray Space Telescope on 2008 June 11, the Large Area Telescope (L...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
Since the launch of the Fermi Gamma-ray Space Telescope on 2008 June 11, the Large Area Telescope (L...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission f...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
Since the launch of the Fermi Gamma-ray Space Telescope on 2008 June 11, the Large Area Telescope (L...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...
International audienceThe Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes ...