Tuesday, November 16, 2010

Fermi LAT weekly report N. 125



Covered period: 2010.Oct.25 - 2010.Oct.31

LAT Mission week: 125.57 - 126.57






  • The flat-spectrum radio quasar 3C 454.3 is still the brightest extragalactic source on the sky. The largest daily flux this week was (7.6 ± 0.8)e-6 on Oct 28.

  • The flat-spectrum radio quasar 4C +21.35 was bright from Oct 25-29, reaching (1.9 ± 0.4)e-6 on Oct 26.

  • The flat-spectrum radio quasar PKS 2326-502 was detected throughout the week, reaching (1.3 ± 0.3)e-6 on Oct 27.

  • The flat-spectrum radio quasar PMN J2345-1555 was detected throughout the week, reaching (0.7 ± 0.2)e-6 on Oct 29. This is part of ongoing activity reported in several ATels (#2972, #2977, #2986, #2989, #3004).

  • The flat-spectrum radio quasar B2 1846+32A reached (1.1 ± 0.3)e-6 on Oct 29.

  • The BL Lac PKS 0537-441 was detected on Oct 26 at (0.9 ± 0.3)e-6 and again on Oct 31 with a similar flux.

  • The classic BL Lac Mkn 421 was detected on Oct 26 and 31 at (0.2 ± 0.1)e-6.

  • The following sources were detected sporadically (in one of the seven one-day time bins): PKS 2155-304, B3 1708+433, PKS 1730-13. PKS 1730-13 turned out to be the beginning of a flare that was sustained into the following week, as reported in ATel #3002.

  • 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:

    - J. Vandenbroucke (justinv[at]stanford.edu) for generic information related to this week.

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


Thursday, November 11, 2010

Fermi LAT weekly report N. 126



Covered period: 2010.Nov.1 - 2010.Nov.7

LAT Mission week: 126.57 - 127.57





  • PKS 1730-13 detected in flare on Nov. 1-2, reaching a daily flux of (1.7+/-0.3)E-6 (see ATel#3002) and continued to be active for most of the week.

  • 3C 454.3 very bright for all the week with daily flux between 8.0E-6 (Nov. 1) and 14.0E-6 (Nov. 5).

  • PKS 1830-211 detected for all the week with daily flux between 0.8E-6 and 2.5E-6.

  • PKS 2326-502 detected in high activity state during the entire week, with daily flux between 0.7E-6 and 1.5E-6.

  • CGRaBS J2345-1555 (also known as PMN J2345-1555) detected on three consecutive days this week (Nov. 1-3), with daily flux between 0.6E-6 and 0.8E-6.

  • B3 1708+433 detected in high activity state on Nov. 3, with daily flux of about 0.9E-6.

  • 4C +21.35 detected on Nov. 2, 4, and 5, with daily flux between 0.3E-6 and 1.3E-6.


  • Sporadic daily detections of blazars: PKS 0537-441, B2 1215+30, B3 2308+34, B2 0619B+33, B2 1520+31, PKS 0336-01, PKS 2155-304, 3C 66A, BL Lacertae, 3C 279.



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 (filippo.dammando[at]ifc.inaf.it) for generic information related to this week

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




Tuesday, November 2, 2010

Fermi LAT weekly report N.123



Covered period: 2010 Oct. 11 - 17

LAT Mission week: 123.57 - 124.57





  • Outburst of high-redshift and gravitationally lensed FSRQ PKS 1830-211 (z=2.507), with important gravitational magnification and Galactic absorption features. The source on October 14, 2010 showed a bright gamma-ray outburst with a daily flux of (5.2+/-1.1)E-6 more than a factor of 12 greater than reported in the Fermi-LAT 1st year catalog (ATel#2943). The flux was higher on Oct. 15 (7.8+/-0.9)E-6, about 18 times the 1-year catalog average flux).

  • PKS 2155-304 reached the threshold of daily flux (1.0+/-0.3)E-6, with photon index 2.6+/-0.3 (ATel#2944). 

    This index value can be due to statistical dispersion and flux-index correlation at low test statistics
    values, close to the sensitivity curve, rather than to a real softer-when-brighter behavior of this high-energy peaked
    blazar.

  • CRATES J0531-4827 bright during the week. 

  • 3C 454.3 bright above daily flux 2E-6.

    The flare of 4C 21.35 is continuing also this week (daily flux above 2E-6).

  • PKS 1329-049 flare at about 1.7E-6 id a day of the week.

    Other sporadic detected blazars: PKS 2326-502, PKS 0208-512, B2 1520+31, PKS
    0426-380, S4 1030+61, PKS 2142-75, B2 0619+33, Mkn 421, 4C 38.41 (B2 1633+38), B2 1846+32A, GB6 J1722+6105, PKS 0537-441, PKS 0244-470



Fluxes are in the unit 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]pg.infn.it) for generic information related to this week

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




Fermi LAT weekly report N.122



Covered period: 2010 Oct. 4 - 10 

LAT Mission week: 122.57 - 123.57





  • CRATES J0531-4827 and PKS0537-441 bright during the week.

  • 3C 454.3 bright above daily flux 2E-6.

  • A new flare of 4C 21.35.

  • PKS 2326-502 in high state at the beginning of the week 

  • Sun eclipse of 3C 279 on Oct.8

  • Other sporadic detected blazars: PKS 1313-333, PKS 1329-049, B2 1520+31, PKS
    0426-380, PKS 1157-215, S4 1030+61, PKS 0727-11, B2 0619+33.



Fluxes are in the unit 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]pg.infn.it) for generic information related to this week

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