Thursday, April 7, 2011

Fermi LAT weekly report N. 147

Covered period: 2011 Mar.28-Apr3 

LAT Mission week: 147.57 - 148.57

  • Flare of S5 0836+71 (4C 71.07, z=2.218) on April 3, with daily flux (1.2+/-0.3)E-6. ATel#3260 issued. A high-z, luminous gamma-ray MeV-peaked blazar (being detected in the past by INTEGRAL, COMPTEL, EGRET), interesting for its intervening system, intrinsic absorbing environment and peculiarly-structured jet.

  • Flare of nearby blazar OX 169 (S3 2141+17, z=0.210) on March 30 (daily flux 1.2+/-0.3)E-6.

  • 3C 454.3 faded below the daily flux level of 1E-6 during the week.

  • Mkn 421 and PKS 0537-441 were rather active and detected all days (Mkn 421 below 0.4E-6, PKS 0537-441 reaching 0.7E-6 on April 3).

  • Other daily detection of blazars below daily flux level of 1E-6:
    RX J1509.7+5556, PKS 2155-304, B2 1520+31, PMN J2345-1555, 1ES 2322-409, 4C 14.23, 3C 66A, GB6

  • GRB 110328B of March 28 is not detectable by the LAT using the standard 0.1-300 GeV dataset. Detectable if the lower energy threshold is reduced to 50 MeV
    (GCN 11835 issued).

Fluxes are in the units of photons/cm^2/s above 100 MeV.

Note. All the fluxes reported above are by 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:

- S. Ciprini (stefano.ciprini[at] for generic information related to this week

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

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