Wednesday, March 31, 2010

Fermi LAT weekly report N. 94




Covered period: 2010.Mar.22 - 2010.Mar.28

LAT Mission week: 94.57 - 95.57





  • 3C 454.3 still bright throughout the week, and increasing its flux value from 2.4 X 10^-6 ,at the beginning of the week, up to 7.2 X 10^-6 occurred the last day of the week.

  • PKS 0537-441 detected all the week with flux values oscillating around 10^-6

  • PKS 0426-380 detected for 5 days of the week with mean flux value of = 0.8 X 10^-6

  • 4C 38.41, 3C 273 seen twice this week with mean flux values respectively of 2.5 X 10^-6 and 1.2 X 10^-6

  • Mkn 421 quasi-detected twice during the week (mean flux about 0.2 X 10^-6)

  • Sporadic activity from B2 0716+33, PKS 1510-08, 4C 21.35, PKS 0524-485, PKS 2233-148, PKS 0402-362.



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:

- E. Antolini (elisa.antolini[at]tiscali.it) for generic information related to this week

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




Tuesday, March 30, 2010

Fermi LAT weekly report N. 93



Covered period: 2010.Mar.15 - 2010.Mar.21

LAT Mission week: 93.57 - 94.57





  • PKS 0537-441 was getting brighter at the end of the week. Its weekly average flux was (0.9 ±0.1)*10^-6. Previous gamma-ray activity was reported in ATels #2454, #2124, #1759.

  • PKS 1510-08 was observed at the end of the week peaking at (3.0 ±0.6)*10^-6 on the 20th of March.

  • 4C +21.35 was detected above 0.7*10^-6 throughout the week.

  • PKS 0727-11 was observed in a high state with a weekly average flux of (0.9 ±0.1)*10^-6.

  • PKS 0402-362 was detected on the 15th of March with a flux of (2.0 ±0.4)*10^-6. Its weekly average flux was (0.7 ±0.1)*10^-6.

  • 3C 273 remained bright throughout the week with an average flux of (2.2 ±0.2)*10^-6.

  • 3C 454.3 remained bright throughout the week as well, with an average flux of (2.6 ±0.2)*10^-6 .

  • Fermi J2102+4542 probably associated with the symbiotic nova V407 Cyg (ATel #2487). Average weekly flux=(0.5 ±0.1)*10^-6. You can read more about the current exceptional outburst of V407 Cyg on Universe Today.


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

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




Monday, March 22, 2010

Fermi LAT weekly report N. 92



Covered period: 2010.Mar.08 - 2010.Mar.14

LAT Mission week: 92.57 - 93.57





  • 3C 454.3 still bright throughout the week, with an initial daily flux greater than 4 X 10-6 and fading to 2.5 X 10-6.

  • 3C 273 also bright, detected on 5 days this week with a daily flux greater than 2.4 X 10-6.

  • The FSRQs PKS 0402-362 and PKS 0426-380 both bright, detected most days of the week, with a daily flux just above and below (respectively) the 1 X 10-6 threshold.

  • PKS 0527-441 detected all this week long with an average daily flux of 0.5 X 10-6.

  • 0716+714 detected in the first three days of the week with a daily flux of 0.3 X 10-6 in the first day and 0.8 X 10-6 in the following ones.

  • Sporadic activity from PKS 0250-225 (0.5), MKN 421 (0.3), PKS 0727-11 (0.6 and 1.1), B2 1520+31 (0.4), PG 1553+113 (0.2), and PKS 2326-502 (0.4). In parenthesis the daily flux in unit of 10-6.

  • The unidentified source J2102+4542 was detected in the last 2 days of the week with a flux of 1 X 10-6, and 1.4 X 10-6, respectively. See ATel#2487.



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:

- D. Donato (donato[at]milkyway.gsfc.nasa.gov) for generic information related to this week

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




Fermi LAT weekly report N.91



Covered period: 2010.March.01 - 2010.March.07


LAT Mission week: 91.57 - 92.57






  • 3C 454.3 still bright, detected daily throughout the week, with an average daily flux of 3.1 e-6.


  • 3C273 also bright, detected on 4 days this week with an average daily flux of 2.2 e-6 and reached (3.1+/-0.7)e-6 on the 7th .


  • The FSRQs PKS 0402-362 and PKS 0426-380 both bright, detected throughout the week and both reached a high daily flux on the 7th: PKS 0402-362 (1.4+/-0.30) e-6 and PKS 0426-380 (1.6+/-0.3) e-6.


  • PKS 1244-255 exhibited a rapid flare midweek, reaching (1.3+/-0.3) e-6 for the 4th.


  • 4C+21.35 bright on the 2nd at a daily flux of (1.1+/-0.4) e-6.


  • 4C+38.41 and PKS 0527-441 detected most days this week.


  • Sporadic activity from PKS 0454-234, PKS 0727-11 , PKS 0736-770 and B2 1520+31 .




Fluxes are in the units 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:

- Anna Cannon (annacannon1984@gmail.com) for generic information related to this week.


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



Fermi LAT weekly report N.90



Covered period: 2010.Feb.22 - 2010.Feb.28



LAT Mission week: 90.57 - 91.57





  • 3C 454.3, as usual, is always present during the week, its daily maximum flux has been detected on Feb. 22 with a value of at (3.2 +/- 0.5) e-6.
  • Blazar 4C 21.35 reached on Feb. 22 and on Feb. 27 the flux value of (1.3 +/- 0.4)e-6 .

  • Markarian 421 detected (fading) only on Feb. 22 with a daily flux below 1e-6.

  • PKS 0537-441 detected most of the week with a daily flux less below 1e-6.

  • 4C 38.41 (S4 1633+38) was in high state on Feb. 23 with a daily flux of (1.5+/-0.4)e-6 (see Atel#2456). In this day the flux of 1FGL J1635.0+3808 (the LAT 1-year point source catalog object associated with 4C +38.41) increased to approximately an order of magnitude with respect to its average flux.

  • PKS 0426-380 detected a couple of time with a flux around 0.8e-6.

  • 3C 273 reached a daily flux value of (1.6 +/- 0.4)e-6 on Feb. 28.

  • Other bright (flux above 0.5e-6) extragalactic sources detected during the week are: PKS 0805-07 and S5 0716+714.



Fluxes are in the units 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 Buson (buson@pd.infn.it) and Denis Bastieri (denis.bastieri@pd.infn.it) for generic information related to this week.


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



Thursday, March 4, 2010



Covered period: 2010.Feb.15 - 2010.Feb .21

LAT Mission week: 89.57 - 90.57





  • 3C 454.3 still bright with a daily flux at around 3E-6 during this week.

  • Blazar 4C 21.35 has been bright, detected with a daily flux at about 1E-6 four days in the week.

  • Markarian 421 was detected on Feb. 16th, 17th and 21th with a daily flux below 0.5E-6. On Feb. 17th, the blazar exhibited a spectral index of 1.4+/-0.2 and TS=111.

  • PKS 0537-441 detected a couple of times during the week with a daily flux just below 1E-6.

  • J1332-0509 popped up only on Feb. 16th with a daily flux of ( 0.9 +/- 0.3)E-6.

  • PKS 0426-380 detected from Feb. 18th to the end of the week, with a daily flux around 1E-6, reaching (3+/-1)E-6 in the first 6h run on Feb. 18th.

  • B2 1520+31 detected on Feb. 21th with a daily flux of (0.8+/-0.3)E-6.

  • High-Mass X-ray Binary LSI +61 303 was bright during this week, reaching (4 +/- 1)E-6 in the first 6h run on Feb. 18th.



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:

- Lise Escande (escande@cenbg.in2p3) or Denis Bastieri (denis.bastieri@pd.infn.it) for generic information related to this week

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






Covered period: 2010.Feb.8 - 2010.Feb .14

LAT Mission week: 88.57 - 89.57





  • 3C 454.3 still dominated the extragalactic gamma-ray sky with a daily flux at around 3E-6 and above 4E-6 at the end of the week..

  • BLLac object PKS0537-441 has been detected with a daily flux just above 1E-6 two times during the week.

  • Blazar 4C 21.35 has been bright during all the week, reaching a daily flux of (6.1+/-0.6)E-6 on Feb. 8th.

  • Blazar PKS 0244-470 was in a high state on Feb. 12th with a daily flux of (1.0 +/- 0.2)E-6 (see Atel #2440). This corresponds to approximately an order of magnitude increase with respect to the average flux of 1FGL J0245.9-4652 which is the LAT 1-year point source catalog object associated with PKS 0244-470.

  • Other bright (Flux>0.5E-6) extragalactic sources detected on weekly timescale :
    PKS 0727-11, PKS 0426-380 and PKS 1510-08


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:

- Lise Escande (escande@cenbg.in2p3) or Dario Gasparrini (dario.gasparrini@asdc.asi.it) for generic information related to this week

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




LAT Limit on Cyg X-1 during reported AGILE flare



Cyg X-1 on Oct. 16th, 2009



Following the announcement by the AGILE team of a high energy transient event from Cyg X-1 during 2009-10-15 UTC 23:13:36 to 2009-10-16 UTC 23:02:24 (ApJ article ; astro-ph) we have checked the LAT data for the same time period. AGILE reported a flux of 23.2 +/- 6.6 E-7 ph/cm2/s in the energy range 100 MeV to 3 GeV during the flare period. A preliminary analysis of the data indicates that the LAT does not detect any significant emission from the location of Cyg X-1 averaged over this time period; the 95% confidence upper limit for the 100 MeV to 3 GeV flux is ~4 e-7 ph/cm2/s assuming a power-law photon index Gamma=2.2.

For questions and comments please contact Adam Hill (adam.hill [at] obs.ujf-grenoble.fr)