Thursday, September 16, 2010

Fermi LAT weekly report N. 118

Covered period: 2010.Sep.06 - 2010.Sept.12 (UT)

LAT Mission week: 118.57 - 119.57

  • PKS 1329-049 (ATel #2837) on September 6, 2010, was in a high state with a gamma-ray flux (E>100MeV) of (3.0 +/-0.5) x10^-6 photons cm^-2 s^-1, making it the brightest source in the extragalactic gamma-ray sky on that day. On September 7, the source was still bright with a flux of (2.3 +/-0.7) x10^-6 photons cm^-2 s^-1, it was also detected with lower flux on September 8 and 11. Previously, the source was detected by Fermi on the 1-day timescale on September 22, 2009, and July 7, 2010, at a flux level of about 1.0 x10^-6 photons cm^-2 s^-1 (ATel #2728). The Fermi LAT contact person for this source is D. Donato (donato[at]

  • S5 0716+714> was detected on September 10 with a flux of (0.6 +/-0.2) x10^-6 photons cm^-2 s^-1.

  • 4C +21.35 was detected on September 6, 8 and 11 flux of about 1.0 x10^-6 ph cm^-2 s^-1.

  • 3C 454.3 was detected throughout the week at a flux of about 2.0 x10^-6 ph cm^-2 s^-1.

  • Active sources appearing for short periods of time during this week were:
    PKS 0332-403 (Sep. 10), S4 1030+61 (Sep. 7, 8), TON 599 (4C +29.45, Sep. 6), B2 1520+31 (Sep. 6, 11), PKS 2155-304 (Sep. 7, 9, 10), PKS 2326-502 (Sep. 7, 11, 12).

Fluxes are in the unit 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:

- K. Sokolovsky (ksokolov[at] for generic information related to this week

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

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