Tuesday, April 29, 2014

Fermi LAT Weekly report N. 307


Covered period: 2014.Apr.20 - 2014.Apr.27
  LAT Mission week:307.57 - 308.57

  • TXS 1530-131 showed activity after a long quiescent period, reaching a peak flux of 1.8 ± 0.4 on April 24.
  • PKS 1730–13 became active after a long quiescent period, reaching a peak flux of 1.1 ± 0.3 on April 24.
  • 3C 454.3 has shown activity during the week, reaching a peak flux of 2.3 ± 0.6 on April 22.
  • 3C 279 was detected with flux between 0.6 and 1.
  • OP 313 was detected at the 1.0 ± 0.2 flux level on April 26.
  • Sporadic daily detections of blazars (fluxes below 1): S5 0716+71, PKS 0336–01, PKS 0426–380, Mkn 421, OJ 287, NGC 1275, PMN J2345–1555, PKS 0426–380, PMN J0948+0022, PKS 2227–08, PKS 0454–234, PKS 2326–502.
  • PKS B1424–418 was detected during the week with flux between 0.6 and 1.3.
  • A non-2FGL gamma-ray source was detected during the week between April 14 and April 21, 2014 by the FAVA automatic analysis (M. Ackermann et al. 2013 ApJ 771 57) at a flux level of 0.77 ± 0.13 (ATel#6098) . The preliminary best-fit location of the gamma-ray source is RA = 100.383 deg, Dec = -3.294 deg, with 95% confidence that the source is within 0.25 deg of this position (statistical errors only).


    Fluxes are in the unit of 10-6 photons/cm^2/s above 100 MeV. All uncertainties are statistical only.

    Note. All the flux 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. Becerra Gonzalez (josefa.becerra[at]nasa.gov) for generic information related to this week
    - Contact persons on this page for individual sources cited above.

Tuesday, April 22, 2014

Fermi LAT Weekly report N. 306


Covered period: 2014.Apr.14 - 2014.Apr.20
  LAT Mission week:306.57 - 307.57

  • S5 0716+714 displayed enhanced activity during the first days of the week and on April 19 its daily flux peaked at 1.2+/-0.2 (ATel#6085).
  • Mkn 421 detected all the days of the week with a daily flux between 0.1 and 0.7.
  • PKS 1424–418 observed throughout the week with daily flux between 0.5 and 0.9.
  • 3C 279 still observed at enhanced state in some days of the week. The highest daily flux of this week (1.9 ± 0.5) was reached on April 14.
  • A source possibly associated with the FSRQ PKS 1824-58 (see past week ATel#6067) has been observed at daily flux of 1.0 ± 0.3 on April 15.
  • 4C +21.35 and TXS 1530-131 were observed almost all days of the week with daily flux around 0.9 and 0.6, respectively.
  • 3C 454.3 detected throughout the week at daily flux values between 1.3 and 2.5.
  • Other blazars and AGNs of the week: OP 313, S5 1044+71, NGC 1275, B2 1144+40FERMI J1532-1321, PKS 1716–771, OJ 287, PMN J2345–1555, PKS 0336–01, Mrk 501, PKS 0426-380.

Fluxes are in the unit of 10-6 photons/cm^2/s above 100 MeV. All uncertainties are statistical only.

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. Buson (buson[pd].infn.it) for generic information related to this week
- Contact persons on this page for individual sources cited above.

Fermi LAT Weekly report N. 305



Covered period: 2014.Apr.7 - 2014.Apr.13
LAT Mission week:305.57 - 306.57

  • OP 313 underwent a strong outburst; the source reached a peak daily flux of 1.1 ± 0.2 on April 12 as reported in ATel#6068.
  • A non-2FGL gamma-ray source associated with PKS 1824-58 (ATel#6067) was detected on April 11 at a daily flux of 0.8 ± 0.2.
  • 3C 279 showed a slow decreasing activity after the strong outburst observed the previous week. The daily averaged flux was  4.8±0.6 on April 7 and decreased to about 0.6 in the last days of the week.
  • 3C 454.3 was observed almost all days of the week; the highest flux was recorded on April 8 when the FSRQ flux reached the daily value of 3.5 ± 0.7. 
  • S5 0716+71 and PKS B1424–418 detected throughout the week with an average daily flux of 0.4 and 0.7, respectively.
  • Further bright blazars detected in some days of the week with a daily flux in the range 0.4-0.8: TXS 1530-131, PKS 1510–08, Mkn 421.
  • Other blazars and AGNs of the week: PKS 0426-380, S5 1044+71, PG 1553+113, B3 1343+451NGC 1275.
Fluxes are in the unit of 10-6 photons/cm^2/s above 100 MeV. All uncertainties are statistical only.

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. Buson (buson[pd].infn.it) for generic information related to this week
- Contact persons on this page for individual sources cited above.

Tuesday, April 8, 2014

Fermi LAT Weekly report N. 304


Covered period: 2014.Mar.31 - 2014.Apr.6
LAT Mission week:304.57 - 305.57

  • The outburst of the FSRQ 3C 279 continued during the week and reached the highest daily averaged of (7.0±0.7)E-6 on April 5. This is the highest gamma-ray flux ever observed by the LAT from 3C 279. Strong variability on six-hour timescales has been detected, showing a minimum flux of about 1.8E-6 and maximum of about 10.4E-6 on April 5.
  • 3C 454.3 was in a high state during the week reaching a peak daily flux of about 2.4E-6 on April 5.
  • PKS B1424–418 was detected during the week with a maximum daily flux of about 1.4E-6 on April 2.
  • A non-2FGL gamma-ray source was detected on April 3 with a daily flux of about 0.4E-6 at RA=37.4583 Dec=-48.0284 with a 1-sigma error circle radius of 0.22. A possible counterpart is the FSRQ PMN J0231-4746 (z=0.77) located 0.35 degrees away.
  • A non-2FGL gamma-ray source associated with PKS 2136-642 (ATel#5695) was detected on April 4 with a daily flux of about 0.5E-6.
  • The FSRQ PKS B1319–093 was detected on April 1 with a daily flux of (0.50±0.13)E-6. The flux level corresponds to 27 times the flux reported on the 2FGL catalog.
  • Sporadic daily detections of blazars (fluxes below 1): Mkn 421, PKS B1056–113, PKS 1510–08, S4 1144+40, OP 313 and 4C +21.35.

Fluxes are in the unit of photons/cm^2/s above 100 MeV. All uncertainties are statistical only.
  
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:
- J. Becerra Gonzalez (josefa.becerra[at]nasa.gov) for generic information related to this week
- Contact persons on this page for individual sources cited above.


 


Tuesday, April 1, 2014

Fermi LAT Weekly report N. 303


Covered period: 2014 March 24-30
LAT Mission week: 303.57 - 304.57

  • Outburst of 3C 279 in the second part of the week. This FSRQ showed increasing brightness reaching a daily averaged flux level of (4.0±0.5)E-6 and a 6-hour averaged flux of (9.9±1.8)E-6 on March 30. This outburst corresponds to the second highest gamma-ray flux ever observed by the LAT from 3C 279 since the start of the Fermi mission (see ATel#6036). At 21:56 UT on March 31, Fermi started a 350ks target of opportunity observation to increase LAT exposure on this blazar.
  • Enhanced gamma-ray activity from blazar MG J221916+1806 (CRATES J2219+1806, CGRaBS J2219+1806, BZQ J2219+1806) with a weekly flux about 0.1E-6 and discovered thanks to new method implemented within the LAT Collaboration known as "Fermi All-sky Variability Analysis" (FAVA) (see ATel#6020). 
  • 3C 454.3 was in high state during the week reaching a daily flux of about at 2.1E-6 on March 28.
  • PKS 1424-41 detected all the days of the week and peaking at about 1.3E-6 on March 26.
  • S5 1044+71 detected all the days of the week and peaking at about 0.8E-6 on March 24 and 30.  
  • Further bright blazars detected in some days of the week with a daily flux in the range 0.6-0.8E-6: PKS 1510-08, OJ 287, PKS 0426-380, Mkn 421.
  • Other blazars and AGNs of the week: Mkn 501, B2 1144+40, 4C +38.41 (B2 1633+38, S4 1633+38), 3C 66A, Fermi J1532-1321 (TXS 1530-131), 4C +01.28 (PKS 1055+01), PMN J0948+0022 (a NLSy1).
  • Non-2FGL gamma-ray source associated to PKS 2136-642 (ATel#5695) showed enhanced activity during the week, being detected the last three days of the week and peaking in daily flux at  about 0.9E-6 on both March  28 and 30. GCN circular #16062 is possibly related to this flaring activity. 
  • GRBs detected by the LAT during the week: GRB 140323A, GRB 140329A, while GRB 140330A is retracted in follow-up GCN circular #16062.

Fluxes are in the unit of photons/cm^2/s above 100 MeV. All uncertainties are statistical only.
  
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.