Monday, March 22, 2010

Fermi LAT weekly report N.90

Covered period: 2010.Feb.22 - 2010.Feb.28

LAT Mission week: 90.57 - 91.57

  • 3C 454.3, as usual, is always present during the week, its daily maximum flux has been detected on Feb. 22 with a value of at (3.2 +/- 0.5) e-6.
  • Blazar 4C 21.35 reached on Feb. 22 and on Feb. 27 the flux value of (1.3 +/- 0.4)e-6 .

  • Markarian 421 detected (fading) only on Feb. 22 with a daily flux below 1e-6.

  • PKS 0537-441 detected most of the week with a daily flux less below 1e-6.

  • 4C 38.41 (S4 1633+38) was in high state on Feb. 23 with a daily flux of (1.5+/-0.4)e-6 (see Atel#2456). In this day the flux of 1FGL J1635.0+3808 (the LAT 1-year point source catalog object associated with 4C +38.41) increased to approximately an order of magnitude with respect to its average flux.

  • PKS 0426-380 detected a couple of time with a flux around 0.8e-6.

  • 3C 273 reached a daily flux value of (1.6 +/- 0.4)e-6 on Feb. 28.

  • Other bright (flux above 0.5e-6) extragalactic sources detected during the week are: PKS 0805-07 and S5 0716+714.

Fluxes are in the units of photons/cm2/s above 100 MeV. All errors are statistical only.

Note. All the fluxes reported above are from the ASP analysis and should be considered preliminary and should not be used for publication, however they are indicative of the flux range and the current status of a source. Source association is done on the basis of source location, considering spatial coincidence only, and it is not indicative of an identification. Please acknowledge the LAT team if you use information from this report.

For questions and comments please contact:

- Sara Buson ( and Denis Bastieri ( for generic information related to this week.

- Contact persons on this page for individual sources cited above.

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