Monday, June 21, 2010

Fermi LAT weekly report N. 105




Covered period: 2010.Jun.06 - 2010.Jun.13


LAT Mission week: 105.57 - 106.57




  • 3C 454.3 was detected all days of the week with a average flux of ~ 2E-6 reaching the higher level of (3.1+/-0.5)E-6 on June 9th.


  • PKS 0235-618 was detected for the first time in a daily time scale with a flux above the threshold of (1.1+/-0.3)E-6 in June 10th, an Atel was issued about the flaring activity of this source (Atel #2669).A Swift ToO was required (see Atel #2673).


  • 4C 21.35 was detected all days of the week showing an increasing trend.


  • PKS 0426-380 was detected on June 13, 11 and 10, PKS 0537-441 was detected on June 13, 12, 11 and 9 and S5 0716+714 was detected only on June 7th.


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:


- Sara Cutini (sara.cutini[at]asdc.asi.it) for generic information related to this week.


- Contact persons on this page for individual sources.

Thursday, June 10, 2010

Fermi LAT weekly report N. 104



Covered period: 2010.May.31 - 2010.Jun.06

LAT Mission week: 104.57 - 105.57





  • PKS 1915-458 (June 4; ATel #2666). Fermi/LAT has detected a new gamma-ray source positionally consistent with PKS 1915-458, a flat spectrum radio quasar at z=2.47 (Jackson et al. 2002, A&A, 386, 97). The redshift is unusually high for a flaring LAT blazar, however not unprecedented (ATEL #2217). On June 4, 2010 the gamma-ray flux (E>100MeV) of (0.36 +/-0.15) x10^-6 was observed corresponding to a detection significance of slightly greater than 5 sigma. Swift ToO observations have been requested to confirm identification of the flaring gamma-ray source with PKS 1915-458.

  • GB6 B1310+4844 (GB1 1310+487) is showing increasing gamma-ray flux during the last few weeks. The source was occasionally detected on daily timescale during this week with the moderate flux of ~0.4x10^-6.
    Multiwavelength observations of the source are desirable to compare its current elevated gamma-ray state with the previous major gamma-ray flare in November 2009 (ATel #2306, #2310, #2311, #2316, #2320).

  • BL Lac was detected on June 4 and 5 with a flux of ~(0.8 +/-0.2)x10^-6.

  • 4C +21.35 was detected during the first half of the week.

  • 3C 454.3 was detected throughout the week.

  • Other sources detected on daily timescale during the week:
    PKS 0426-380 (May 31, June 6), PKS 0537-441 (June 2, 5, 6), S5 0716+714 (May 31, June 5), S4 1030+61 (June 2, 4), PKS 1329-049 (June 1), PKS 1326-697 (June 2), PKS 1424-41 (June 1, 2, 6), PKS 1510-08 (June 3), 1FGL J1642.5+3947 (=3C 345?, June 2), PKS 2233-148 (June 3).



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:

- Kirill Sokolovsky (ksokolov[at]mpifr-bonn.mpg.de) and Frank Schinzel (schinzel[at]mpifr-bonn.mpg.de) for generic information related to this week.

- Contact persons on this page for individual sources.




Friday, June 4, 2010

Fermi LAT weekly report N. 103



Covered period: 2010.May.24 - 2010.May.30

LAT Mission week: 103.57 - 104.57





  • Cygnus X-3 brightened this week during the current soft state. See ATEL #2646.

  • Blazar 4C +21.35 (PKS 1222+21) rebrightened and was detected each day this week, peaking at (7.3 ± 0.6) x 10-6 on May 26.

  • BL Lacertae brightened on May 28 with a flux of (1.2 ± 0.3) x 10-6

  • 3C 454.3 remained steady and bright with daily flux above 2 x 10-6

  • PKS 0537-441 was above threshold several days this week with daily flux between 0.7 x 10-6 and 1.1 x 10-6

  • PKS 0426–380, S5 0716+71, GB 1310+487, PKS 1424-41, and PKS 1510-08 were detected on several days this week below 1 x 10-6

  • Blazars S4 1030+61, PKS 1329–049, and PKS 2155–304 were each detected during one day this week



Fluxes are in units of photons/cm2/s above 100 MeV. All errors are statistical only.



Note: all 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 using spatial coincidence only and is not indicative of an identification.

- Please acknowledge the LAT team if you use information from this report.

For questions and comments please contact:

- Liz Hays (elizabeth.a.hays[at]nasa.gov) for generic information related to this week.

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