Fermi LAT Monitored Source List

Fermi LAT Monitored Source List FERMILASP ivo://nasa.heasarc/fermilasp NASA/GSFC HEASARC HEASARC 2026-05-08 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov AGN Lightcurve Transient XRB The Fermi LAT table of monitored sources provides daily and weekly fluxes for sources of interest as described in <a href="http://fermi.gsfc.nasa.gov/ssc/data/policy/LAT_Monitored_Sources.html">http://fermi.gsfc.nasa.gov/ssc/data/policy/LAT_Monitored_Sources.html</a>. In addition, similar information will be released for any source which flares above 2x10-6 photons cm-2 s-1 until the flux drops below 2x10-7 photons cm-2 s-1. Fermi is currently in survey mode and observes the entire sky every day. However, if a source does not exceed the detection threshold, no entry will appear in this catalog. The tabulated fluxes are derived at the LAT Instrument Science Operations center in a 'quick look' analysis to produce results quickly to facilitate follow-up multi-wavelength observations of flaring sources. The table of released fluxes will be updated as analysis and calibrations improve. These early flux estimates do not include systematic uncertainties and do not have an absolute flux calibration. Use of these data as absolute flux measurements for constraining models or for comparison to other data is strongly discouraged at this time. In addition to overall normalization uncertainties, source fluxes may have variations of up to 10% due to currently-uncorrected dependencies of the gamma-ray detection efficiency on variations of the particle background in orbit. Please note that these results are produced using preliminary instrument response functions and calibrations. The quality and stability of these results will improve when updated calibrations become available over the coming months. This database table is created by the HEASARC from FITS tables received from the Fermi Science Support Center (FSSC). The ASP FITS files are produced by the LAT Instrument Science Operations Center (LISOC) and transferred from the LISOC to the FSSC about once per week. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/fermilasp.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=fermilasp& GET text/xml 180 99999 true 330.583 -83.637 0.333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=fermilasp GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_fermilasp&Action=More+Options&Action=Parameter+Search&ConeAdd=1 FERMI 0.333333333333333 Gamma-ray public fermilasp Fermi LAT Monitored Source List name Source Designation (ASP for New Source Detected by ASP) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable "time" Observation Start Time mjd time.start;obs double nullable end_time Observation Start Time mjd time.end;obs double nullable flux_0p1_300_gev_limit Upper Limit Flux Flag, 100-300000 MeV meta.code;phot.flux;em.gamma char nullable flux_0p1_300_gev Flux, 100-300000 MeV photon/s/cm^2 phot.flux;em.gamma double nullable flux_0p1_300_gev_error Uncertainty in Flux, 100-300000 MeV photon/s/cm^2 stat.error;phot.flux;em.gamma double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable duration Duration (MET seconds) s time.duration;obs.exposure double nullable test_stat_0p1_300_gev Test Statistic for 100-300000 MeV Data double nullable flux_1_300_gev Flux, 1000-300000 MeV photon/s/cm^2 phot.flux;em.gamma double nullable flux_300_1000_mev_limit Upper Limit Flux Flag, 300-1000 MeV meta.code;phot.flux;em.gamma char nullable met_start Observation Start Time (MET seconds) s time.start;obs double nullable met_end Observation Stop Time (MET seconds) s time.end;obs double nullable flux_300_1000_mev_error Uncertainty in Flux, 300-1000 MeV photon/s/cm^2 stat.error;phot.flux;em.gamma double nullable flux_300_1000_mev Flux, 300-1000 MeV photon/s/cm^2 phot.flux;em.gamma double nullable bii Galactic Latitude degree pos.galactic.lat double nullable flux_1_300_gev_error Uncertainty in Flux, 1000-300000 MeV photon/s/cm^2 stat.error;phot.flux;em.gamma double nullable flux_1_300_gev_limit Upper Limit Flux Flag, 1000-300000 MeV meta.code;phot.flux;em.gamma char nullable lii Galactic Longitude degree pos.galactic.lon double nullable