Monday, July 25, 2011

Fermi LAT weekly report N. 163


Covered period: 2011 July 18-24

LAT Mission week: 163.57 - 164.57



  • PKS 1510-08, 4C 38.41 (B2 1633+38), and BL Lacertae were above the daily flux level of 1E-6 in some days of the week. PKS 1510-08 reached a flux level of about 6E-6 in the last 6h interval of July 24.

  • The other blazars of the week, detected at least one time in the daily analysis, are: S5 0716+71, B2 1520+31, PKS 0537-441, PKS 1424-41, PKS 2155-304, PKS 2326-502, PKS 2142-75, S4 1749+70, PKS 0454-234, TXS 2247-283 (PMN J2250-2806), PKS 0301-243, 4C 55.17, 4C 38.41, PMN J2345-1555.

  • Other blazars detected on the weekly timescale with an averaged weekly flux above 0.4e-6 are: 3C 279, PKS 1830-211, 4C 28.07, PKS 1622-253.


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.


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Wednesday, July 13, 2011

Fermi LAT weekly report N. 161


Covered period: 2011.Jul.04 - 2011.Jul.10

LAT Mission week: 161.57 - 162.57





  • An increasing gamma-ray activity from PKS 1510-089 was detected since July 1, 2011. On July 4 the source reached a gamma-ray flux (E > 100 MeV) of (8.3+/-1.0)e-6 in the daily time scale and a flux of (12.0+/-1.9)e-6 in the 6-hour interval starting at 06:00 UT of the same day (ATel#3473).
    A decrease of the activity was detected in the following days (July 5-8) with a daily flux between (1.5+/-0.6)e-6 and (2.1+/-0.5)e-6.


  • A gamma-ray flare from the flat spectrum radio quasar CGRaBS J1849+6705 was detected on July 6, 2011, with a daily flux of (2.5+/-0.3)e-6 (ATel#3478).


  • A gamma-ray flare from the flat spectrum radio quasar PKS 0235-618 was detected on July 10, with a daily flux of (1.1+/-0.2)e-6.


  • 4C +38.41 detected bright all the week, with a daily flux between (1.2+/-0.2)e-6 and (2.2+/-0.4)e-6.


  • BL Lac detected between July 4 and 9, with a decreasing flux from (1.3+/-0.3)e-6 to (0.5+/-0.2)e-6.


  • SBS 1150+497 detected between July 4 and 6, with a daily flux between (0.3+/-0.1)e-6 and (0.7+/-0.2)e-6.


  • B2 1520+31 detected on July 4, 7, and 8, with a daily flux between
    (0.4+/-0.2)e-6 and (0.7+/-0.2)e-6.


  • S5 0716+714 detected on July 6, 9 and 10, with a daily flux between (0.6+/-0.2)e-6 and (0.9+/-0.2)e-6.


  • Sporadic daily detections of blazars: PKS 0208-512 (July 4 and 5),
    PMN J2345-1555 (July 4 and 7), PKS 0537-441 (July 5), Mrk 421 (July 7), PKS 1622-253 (July 7), PKS 0250-225 (July 10).




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

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



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Tuesday, July 12, 2011

Fermi LAT weekly report N.160


Covered period: 2011.Jun.27 - 2011.Jul.03

LAT Mission week: 160.57 - 161.57




  • On June 28 BL Lacertae shows an unusual gamma-ray spectrum with a photon number power-law index of 1.70 +/-0.15 (ATel #3462) in agreement with the TeV flare detection from VERITAS.

  • PKS 1510-089 continues its high activity reaching a daily flux around (4.2 +/- 0.7)X 10-6 on Jul 03.


  • 3C 279 and 4C 38.41 (B2 1633+38) bright for most of this week (daily flux approaching and around 1 X 10-6).


  • B2 1520+31, PKS 0537-441, PKS 0250–225, PMN J2345–1555,PKS 1424–41, PKS 0521–36, MKN 421 detected in one or two days of the week (flux below 1 X 10-6 ).




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. Gasparrini (gasparrini[at]asdc.asi.it) for generic information related to this week

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



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Fermi LAT weekly report N.159


Covered period: 2011.Jun.20 - 2011.Jun.26

LAT Mission week: 159.57 - 160.57




  • CRATES J1239+0443 detected also this week with a low daily flux in the range 0.4-0.5 X 10-6 on Jun. 20 and 22 and flaring with flux (1.1 +/- 0.4) X 10-6 on Jun. 23.

  • B2 1520+31 detected from Jun. 22 to Jun. 26 with daily flux in the range 0.5-1.2 X 10-6.

  • 4C +38.41 detected from Jun. 24 to Jun. 26 with daily flux in the range 0.9-1.6 X 10-6.

  • BL Lac detected on Jun. 23 and 24 with daily flux in the range 0.7-1.1 X 10-6.

  • The radio-loud narrow-line Sy1 galaxy SBS 0846+513 was detected on Jun. 21 with daily flux of (0.8+/-0.2) X 10-6 (see ATel#3452).

  • Sporadic activity (fluxes above 1.0 X 10-6) observed from CGRaBS J0948+0022 (1.1 on Jun. 20), 3C 279 (1.1 on Jun. 26), PKS 1510-08 (3.6 on Jun. 26).

  • Sporadic activity (fluxes below 1.0 X 10-6) observed from 4C +28.07 (0.5 on Jun. 21), PKS 0250-225 (0.7 on Jun. 23), CGRaBS J0721+7120 (0.6 on Jun. 20), CRATES J0742+5444 (0.5 on Jun. 20), CGRaBS J1849+6705 (0.7 on Jun. 20), PKS 1055+01 (0.4 on Jun. 20), 1150+497 (0.4 on Jun. 24), PKS 1502+106 (0.8 on Jun. 23), CGRaBS J1849+6705 (0.4 on Jun. 22), PKS 2032+107 (0.5 on Jun. 24), PMN J2345-1555 (0.8 on Jun. 20).



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.



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Tuesday, June 28, 2011

Fermi LAT weekly report N. 158


Covered period: 2011.Jun.13 - 2011.Jun.19

LAT Mission week: 158.57 - 159.57




  • FSRQs MG1 J123931+0443 (z=1.762) and GB6 J0742+5444 ( z=0.72) both active during the week and both flaring on June 19 (daily flux 1.1 +/- 0.3 X 10-6 and daily flux 1.0±0.2 X 10-6 respectively). See ATel#3445.

  • 3C 279 bright during this week (flux approaching and around 1 X 10-6).

  • PMN J0948+0022 detected on June 19 with daily flux around 1.4 X 10-6 .

  • PKS 1830-211, 4C +38.41, B2 1520+31, PKS 0537-441, PKS 2326–502, PMN J2345-1555, BL Lac detected in one or two days of the week (flux below 1 X 10-6 ).



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. Gasparrini (gasparrini@asdc.asi.it) for generic information related to this week

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



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Wednesday, June 15, 2011

Fermi LAT weekly report N. 157


Covered period: 2011 June 6-12

LAT Mission week: 157.57 - 158.57



  • Bright gamma-ray flaring emission from the Sun on June 7 with an increase of two orders of magnitude with respect to quiet solar disk emission. See ATel#3417.

  • Flare of flat spectrum radio quasar PKS 1622-253 on June 7 (daily flux (2.0 ± 0.3) E-6). See ATel#3424. 

  • Flare of the narrow-line Seyfert-1 galaxy PMN J0948+0022 (daily flux (1.5 ± 0.3) E-6). See ATel#3429.

  • Other bright blazars in daily intervals of the week: CTA 102, BL Lacertae, S5 0716+71, 3C 279, B2 1520+31, OX 169.

  • Other daily-detected blazars during the week: PMN J2345–1555, PKS 2155-304, 3C 454.3, Mkn 501, Mkn 421, PKS 2326-502, PKS 1244-255, S4 1749+70, PKS 2326-502, PKS 0537-441, GB6 J0742+5444, 4C 28.07, 4C 21.35, S5 0836+71, S4 1849+67.


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]asdc.asi.it) for generic information related to this week

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


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Tuesday, June 14, 2011

Fermi LAT weekly report N. 156


Covered period: 2011.May.30 - 2011.June.05

LAT Mission week: 156.57 - 157.57




  • PMN J1123-6417 was detected in flaring state on May 30, with a daily flux of (1.4+/-0.4)e-6 (ATel #3394). PMN J1123-6417 is a likely AGN of uncertain type at a Galactic latitude, b=-3 deg. This association is confirmed also by Mahony et al. (2010) using the AT20G survey catalog. No redshift is known for this object.


  • A gamma-ray flare from the high-redshift (z=2.07) blazar PKS 0528+134 was detected on June 5, 2011, with a daily flux of (1.1+/-0.4)e-6 (ATel #3412).


  • PKS 1622-253 detected in flaring state on June 4 and 5, with a daily flux of (1.1+/-0.3)e-6 and (1.0+/-0.3)e-6, respectively. This high activity reached a peak flux of (2.0+/-0.3)e-6 on June 7 and has continued in the following days, as reported in the ATel #3424.


  • CTA 102 detected very bright on 31 May, with a daily flux of (2.5+/-0.5)e-6.


  • PMN J2345-1555 detected in high state between 30 May and 3 June, with a decreasing flux from (1.0+/-0.2)e-6 to (0.7+/-0.2)e-6.


  • 4C +38.41 detected bright on May 30, May 31, and June 2, with daily flux between 1.1e-6 and 1.3e-6.


  • B2 1520+31 detected in high state on June 4 and 5, with a daily flux of (1.0+/-0.3)e-6 and (1.4+/-0.4)e-6, respectively.


  • NGC 1275 detected in high state on May 31, June 1 and June 4 with a daily flux between (0.9+/-0.3)e-6 and (0.3+/-0.1)e-6.


  • BL Lac detected on May 30, May 31 and June 4, with a daily flux between 0.6e-6 and 0.8e-6.


  • 3C 279 detected bright on June 2 and 3, with a daily flux between 1.0e-6 and 1.2e-6.


  • Sporadic daily detections of blazars: CGRaBS J1849+6705 (June 1), CRATES J0850+4854 (June 2), PKS 1424-41 (June 2), PKS 2052-47 (June 2).



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

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



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