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.


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