Wednesday, April 20, 2011

Fermi LAT weekly report N. 149

Covered period: 2011.April.11 - 2011.April.17

LAT Mission week: 149.57 - 150.57

  • A renewed increase of the gamma-ray activity from a source positionally consistent with the Crab Nebula was detected by Fermi-LAT starting from the period April 9-11, 2011 (ATel #3276).
    Fermi has interrupted all-sky scanning mode between 2011-04-12 16:47 UTC and 2011-04-19 15:49:43 UTC for a dedicated pointing observation of the Crab Nebula. The ATel #3276 promptly issued at the beginning of this new outburst phase triggered also early ToO observations by Swift (ATel #3279) and Chandra (ATel #3283).
    A subsequent extreme gamma-ray outburst was detected in the period April 14-16 (see ATel #3284), with a peak flux of (21.4 +/- 0.7) x10^-6 ph/cm2/sec (statistical errors only) on April 16, confirmed also by AGILE observations (ATel #3286).

  • 3C 279 was detected in a very high state on Apr. 17, with daily flux of (3.3+/-1.0)e-6.

  • Sporadic daily detections of blazars: PMN J2345-1555 (Apr. 11), PKS 1510-08 (Apr. 11), S5 0716+714 (Apr. 14), CRATES J0850+4854 (Apr. 14).

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:

- F. D'Ammando (dammando[at] for generic information related to this week

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

No comments: