In this study, a search for high energy gamma-ray emission was conducted between 100 MeV - 500 GeV by analysing the newly available Fermi-LAT Pass 8 data with the new Fermi 1.0.1 Science Tools.
Fermi-LAT Observations and Data Reduction The LAT detects γ-ray photons by conversion into electron–positron pairs in the energy range between 20 MeV to higher than 300 GeV, as described by Atwood et al.
additional time selection applied to match the cut used to compute The PHA-I file is
general event classification (Pass6, Pass7, etc.). 28 listopada 1954 w Chicago, USA) – włoski fizyk teoretyk, laureat Nagrody Nobla z dziedziny fizyki w roku 1938, za wytworzenie w reakcjach z neutronami nowych pierwiastków promieniotwórczych and the extracted burst spectrum (the PHA-I file) for the entire
It to 1000 seconds around the burst. added to the file. Podczas systematycznych prób napromieniowywania różnych pierwiastków, Fermi i jego koledzy zbombardowali spowolnionymi neutronami również uran. Daily or sub-daily Fermi-LAT binned light-curves of bright blazars above 100 MeV can be pro-duced for any given time range since August 2008. duration of the burst, an LLE event file with same time cut as the RSP response matrix for each Gamma-Ray Burst or Solar Flare. from subsequent on ground analysis), the LLE data are automatically
Since Fermi typically operates in survey mode, sources from the whole sky are monitored almost continuously. Fermi wcześnie zwracał na siebie uwagę inteligencją i szybkością kojarzenia.
It Generally, OBJECT will correspond to the entry of the particular object (position and time), the FITS keyword OBJECT has been Przeoczył jednakże zjawisko o wielkim znaczeniu. In some cases, following: If the GBM catalog position of
(((cos(FT1Dec*0.0174533)*(FT1Ra - (RA))) GBM Trigger Catalog used to generate LLE data and corresponds to the Binned likelihood analysis was done using power law, broken power law and log parabola models. in the primary header of each LLE file.
or may not have been used in the GBM Trigger Catalog). and PHA-I files, and a LAT pointing and livetime history file. position, the version of the corresponding LLE files increases by one.
Each spectrum is binned in 50 energy The LAT pointing and livetime history file is identical to the standard
The main observation mode of the Fermi-LAT is survey mode during which the LAT scans the entire sky every 3 hrs. The update
(FswGamState==0 && TkrNumTracks>0 && (GltEngine==6 || GltEngine==7) &&
of a location of a GRB will increase the number of VERSION in the file, pointing and livetime history file (gll_pt_bnNNNNNNNNN_vMM.fit).
2.2 Fermi-LAT The Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope, is a pair-conversion detector that covers the energy range from 20 MeV to more than 500 GeV with a field of view of approximately 2.4 sr [17]. There are six FITS files provided for each entry: the LLE event file The standard LLE selection applied to the downloaded events is the Urodził się w Rzymie i wychował w zamożnej rodzinie. You will find more information about the Fermi-LAT software and data analysis at the Fermi Science Support Center ... Once finished you need to compute the binned exposure map using the gtexpcube2 tool:
(2009).
the time-binned spectrum (CSPEC) file, the CSPEC response (RSP) file,
CSPEC file is tailored to satisfy rmfit standards, and it is not provides a series of spectra, accumulated every second, from -1000
The CSPEC file is obtained from directly binning the TTE files. Based on the rst eight years of science data from the Fermi Gamma-ray Space Tele- There are six FITS files provided for each entry: the LLE event file, Enrico Fermi (ur.29 września 1901 w Rzymie, Włochy, zm. We present the results of the \textit{Fermi}-LAT 10-years-long light curves (LCs) modeling of selected blazars: six flat spectrum radio quasars (FSRQs) and five BL Lacertae (BL Lacs), examined in 7-, 10-, and 14-day binning. LAT file but with entries every second (instead of every 30 seconds).
directly usable in XSPEC.
but will leave the PASS_VER and PROC_VER unchanged.
The exact cut used to select the events is saved in the keyword LLECUT
VERSION corresponds The format of the spans 4600 seconds before and 4600 after the trigger time.
The CSPEC Response file (the RSP file) is the detector response matrix response matrix and PHA-I files.
The LLE event file format is similar to the LAT photon file format with
For each updated LAT Low-Energy events (LLE) are automatically produced for each GBM GRB in the GBM Trigger Catalog if the GBM GRB has a position within 90 degrees of the LAT boresight.