Monday, November 30, 2009

Fermi LAT weekly report N.75




Covered period: 2009.Nov.08 - 2009.Nov.15 (UT)




  • 3C273 detected in a flaring state reaching his maximum in the daily time scale on 9th November with a flux of (3.9+/-0.5)10^-6 (statistical only).
  • 3C454.3 detected most of the week
  • PKS0722+145 show an increasing trend during the week
  • MRK 421 was not detected during the BAT hard-X ray flare in November 10th.
  • PKS 0537-441 detected November 11th, 12th and 15th.

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



Note. All the flux 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. Cutini (sara.cutini[at]asdc.asi.it) for generic information related to this week

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


Friday, November 27, 2009

Update on GeV activity and spectral hardness of GB6 B1310+4844

The LAT source positionally consistent with the flat spectrum radio quasar GB6 B1310+4844 (commonly known as GB1 1310+487 or TXS 1310+487) continues to show strong and variable activity (ATEL 2306, also see ATEL 2310, ATEL 2311). In the daily run for November 26, the flux(E>100MeV) = 1.2 ± 0.2 10-6 photons cm-2 s-1 and photon index=1.8 ± 0.1 (errors are statistical only; results are preliminary from the automated analysis processing). We note that the spectrum is very hard for this type of source in the GeV band. We strongly encourage multiwavelength observations, in particular optical monitoring, of this object given the ongoing activity and GeV spectrum. The LAT contact person is Kirill Sokolovsky (ksokolov[at]mpifr-bonn.mpg.de).

Note. All the flux values 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.

For questions and comments please contact:

- Liz Hays (elizabeth.a.hays[at]nasa.gov) or Lise Escande (escande[at]cenbg.in2p3.fr) for generic information related to this week

Wednesday, November 25, 2009

Fermi LAT weekly report N.74 



Covered period: 2009.Nov.02 - 2009.Nov.08 (UT)

LAT Mission week: 59.57 - 60.57




  • OJ 287 (LAT+MW ATel #2256) bright and detected with daily flux (0.5+/-0.1)E-6 on Nov.04 and a bit lower on Nov.05. The weekly averaged flux of OJ 287 is showing an increasing trend in the last month (October).

  • 4C 14.23 (PKS 0722+145, LAT ATel #2243) is bright (daily flux above 1E-6 in the first part of the week).

  • 3C 273 is flaring from Nov.06 to Nov.08 (daily flux above 3E-6, reaching the daily peak of (4.6+/-0.4)E-6 ).

  • 3C 279 was detected around 0.7E-6.

  • 3C 454.3 bright (daily flux reached 2E-6 during some days of the week).

  • Mkn 501 and Mkn 421 detected in two days (daily flux about 0.2E-6 on Nov.04 and 0.5E-6 on Nov.07 respectively).

  • B2 1520+31 detected on Nov.06 (daily flux around 0.8E-6).

  • Sun detected a couple of times this week.


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


Note. All the flux 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]pg.infn.it) for generic information related to this week

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



Monday, November 9, 2009

Fermi LAT weekly report N.73



Covered period: 2009.Oct.26 - 2009.Nov.01



  • 3C 454.3 (z=0.859) is still bright with peak flux 3.33 +/-0.63 x 10^-6 on October 29, weekly average flux 2.80 +/-0.19 x 10^-6. However, it is fading rapidly (see daily lightcurve).

  • 3C 273 (z=0.158) weekly flux 1.08 +/-0.18 x 10^-6.

  • 4C 14.23 (z=1.038) was not detected this week, however it reappeared in the first days of the following week: detected on Nov 02, 03, 04.


Fluxes are in the unit of photons/cm^2/s above 100 MeV. Uncertainties shown are statistical only.



Note. All the flux values reported above 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]mpifr-bonn.mpg.de) and F. Schinzel (schinzel[at]mpifr-bonn.mpg.de) for generic information related to this week

* source contact persons on this page for individual objects cited above.