Tuesday, July 12, 2011

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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Thursday, May 26, 2011


Covered period: 2011.May.15 - 2011.May.22

LAT Mission week: 154.57 - 155.57




  • BL Lac is detected in a high state all week reaching a flux of 1.4e-6 on 20th May; see ATel #3368 and the follow up Atels in which optical/X-ray brightening has been reported (#3371, #3375 and #3377).

  • 4C +38.41 is very active all week reaching a flux of (1.5 ± 0.3) e-6.

  • 4C 49.22 is in high state all week, with a flux of (1.3± 0.3)e-6 on 17th May.

  • CTA 102 detected on 18th and 19th May.

  • 4C +21.35, PKS 0521-36, PKS 0537-441, PMN J2345-1555 and 3C279, 3C66A are detected during the week.

  • Referring to the AGILE ATel (#3357) on AGL 2302-3251, we do not confirm the detection in the soft energy band (100MeV-400MeV).





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:

- 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.



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Fermi LAT weekly report N. 153


Covered period: 2011 May 9-15

LAT Mission week: 153.57-154.57




Highlights of this week:

Detection of gamma ray activity from blazar PKS 0208-512 with a flux of (1.1 +/- 0.3)E-6. This was reported in ATel #3338

CTA 102 brightened on May 11, up to a flux of (1.6 ± 0.4) E-6, which is above the level reported in a recent telegram from May 3 (ATel #3320)

Blazar SBS 1150+497 (also known as as 4C 49.22, OM 484) became active this week after a one month hiatus following a short flare on April 15 (ATEL #3313). Back then there were two possible AGN counterparts to the gamma-ray source, but follow-up observations have revealed a contemporaneous increase in flux at GeV, X-ray and NIR (ATEL#3317) wavelengths, which confirms the identification of the Fermi source with SBS 1150+497. A peak flux of (3.4 +/- 0.6)E-6 was observed by Fermi LAT during a 12hr interval on May 15, but since then the source has been detected at a more moderate flux of aprox. 1 E-6.

4C +38.41 remains bright this week, with daily fluxes consistently around 1.3 E-6 for most days and as high as ( 2.5 +/- 0.4) E-6 on May 15

Other daily detections of blazars this week: PKS 1244-255, 3C 279, 4C +28.07, PKS 0537-441, Mkn 421, PKS 2155-304, CRATES J1239+0443, 3C 454.3, BL Lac, PMN J2345-1555

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



Note. All the flux reported above are by the Fermi LAT Automated Science Processing (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:

- A. Szostek (aszostek[at]slac.stanford.edu) and L. Reyes (lcreyes [at] uchicago.edu) 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. 152


Covered period: 2011 May 2-8

LAT Mission week: 152.57-153.57




Highlights of this week:

4C +38.41 became active this week, with a flux hovering around 10^-6 at the beginning of the week and then peaking on May 8 at the level of (2.1 +/- 0.3) E-6. The flare was reported in ATel #3333. High state in NIR was also reported in ATel #3335.

A gamma-ray flare from the blazar S5 1803+78 was detected on May 2 and May 3, at a level of (1.1 +/- 0.2)E-6. The flare was short-lived since on May 4 the source was not detected by Fermi LAT. Optical follow-up observations, also on May 4, found the source at an average brightness (ATEL#3323).

Another short flare detected by Fermi LAT this week was attributed to blazar PKS 1424-41, which on May 5 reached a flux of (1.1 +/- 0.3)E-6, representing more than an order of magnitude increase over the average flux reported in the first Fermi-LAT catalog. The observed flux is comparable with a previous flare observed on April 23, 2010 (Atel #2583).

Other daily detections of blazars this week: PKS 1244-255, PKS 0537-441, 4C +28.07, 4C +21.35, 3C 279, B2 1520+31, PMN J2345-1555, CRATES J0742+5444, PKS 0208-512


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



Note. All the flux reported above are by the Fermi LAT Automated Science Processing (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:

- A. Szostek (aszostek[at]slac.stanford.edu) and L. Reyes (lcreyes [at] uchicago.edu) for generic information related to this week

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