Wednesday, August 29, 2012

Fermi LAT weekly report N. 220


Covered period: 2012.Aug.20 - 2012.Aug.26
LAT Mission week: 220.57 - 221.57

  • First gamma-ray flare of the high redshift BL Lac object PKS2131-021 (z=1.284). The source reached a level of 0.6E-6 (about 30 times greater than the average flux reported in the second Fermi LAT catalog) on August 21. See ATel#4333 for more details. 
  • Bright gamma-ray flare from the gravitationally lensed blazar S3 0218+35 (also known as B2 0218+35, OD 330, lens B0218+357,z=0.944+/-0.002). S3 0218+35 was active in gamma-rays all week, peaking at a daily flux level of about 1.6 and 1.7E-6 respectively on August 26 and 27. The source is lensed by aspiral galaxy at z=0.6846, it possesses one of the smallest Einstein rings in the radio band (0''.33 diameter) and is an important object for studies of gravitational lensing, Hubble constant value and individual molecular clouds at high redshifts. The time delay between the variations in the two compact radio source images is 10.5+/-0.4 days. See ATel#4343 for more details.
  • Several blazars detected in flaring state during this week.
  • BL Lacertae peaked with daily flux about 1.9E-6 on August 25and was above the 1E-6 level most days of the week. 
  • PKS 1830-211 peaked with daily flux about 1.4E-6 on August 21.
  • The high redshift blazar B3 1343+451 (z=2.534) was detected with daily flux of about 1E-6 on August 26.
  • PKS 1510-089 and NRAO 676 were both detected at a daily flux level of 1E-6 on August 23.
  • Enduring activity from Mkn 421 was detected the entire week. The source peaked at a daily flux level of 0.6E-6 on August 21,22 and 26.
  • S5 0716+71 and 4C 38.41 (B2 1633+38) are active and detected all week above the 0.6E-6 level.
  • PKS 2326-502, PKS 1424-41, PKS 2233-148, PKS 0454-234, are other blazars observed above the 0.5E-6 level in some days of the week. 
  • Sporadic daily detections of blazars, with a daily flux level below about 0.5E-6: NGC 1275, PKS 0537-441, Mkn 501

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.


Tuesday, August 28, 2012

Fermi LAT weekly report N. 219


Covered period: 2012.Aug.013 - 2012.Aug.19
LAT Mission week: 219.57 - 220.57

  • A gamma ray source in the vicinity of PMN J1626--2426 reached a flux 1.0 X 10-6. An Atel was issued In response to this event see ATel#4325.
  • PKS 1424-418 bright in the beginning of this week with a flux around 1 X 10-6 and then decreased to 0.4 X 10-6 at the end of the week.
  • Mrk 421 detected everyday this week peaking at 1.3 X 10^-6 on August 17.
  • S5 0716+71 bright this week with flux peaking at 1.4 X 10-6 on August 17
  • NRAO 676 , PKS 2326-502 also bright this week with fluxes peaking around 1.0 X 10-6
  • CTA 102, B3 1342+451, PKS 0537-441, OG 050, 3C 66A, PKS 0244-470, 1633+382, PKS 2233-148, 4C +38.41, 3C 279, BL Lac , PMN J2345-1555 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:
- M. Dutka (ditko86[at]gmail.com) for generic information related to this week
- Contact persons on this page for individual sources cited above.


Tuesday, August 14, 2012

Fermi LAT weekly report N.218


Covered period: 2012.Aug.6 - 2012.Aug.12
LAT Mission week: 218.57 - 219.57

  • S5 0716+71 is detected most of the week with daily flux in the range 0.2-0.7 X 10-6.
  • PKS 1424-418 is detected every day this week with daily flux around 1.6 X 10-6
  • Mkn 421 detected every day this week reaching a peak flux of 1.0 X 10-6 on Aug 10 2012, continuing the high activity already reported in Atel #4261
  • PKS 1830-211 detected every day this week reaching a peak flux of 1.7 X 10-6 on Aug 11 2012
  • PKS 0244-470 detected every day this week but below the threshold of 1.0 X 10-6
  • PKS 2326-502, NRAO 676,OG 050, 3C 66A, SBS 0846+513, PKS 2155-304, B3 1343+451,PKS 1510-08,PKS 2233-148, NGC 1275, B2 1415+36, PKS 0906+01 detected once or twice during 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.

Tuesday, August 7, 2012

Fermi LAT weekly report N.217


Covered period: 2012.Jul.30 - 2012.Aug.05
LAT Mission week: 217.57 - 217.57

  • Four sources were detected every day of the week: S5 0716+71, Mkn 421, PKS 2233-148, and PKS B1424-418. The flux of S5 0716+71 was 0.7 X 10-6, but peaked just above 1.0 X 10-6 on Aug. 2 and 3; Mkn 421 and PKS 2233-148 showed a constant behavior with the daily flux in the range 0.4-0.6 X 10-6 and 0.5-0.8 X 10-6, respectively; PKS B1424-418 was seen more variable with flux flickering between 0.8 and 1.5 X 10-6.
  • PKS 2326-502 was detected in the first 4 days of the week with daily flux in the range 0.6-0.8 X 10-6.
  • Sporadic activity (fluxes below 1.0 X 10-6) observed from 4C +21.35 (0.4 on Jul. 31), 4C +38.41 (0.9 on Aug. 3), PKS 0244-470 (0.7 on Jul. 31 and Aug. 5), PKS 0735+17 (0.2 on Jul. 30), CTA 102 (0.5 on Jul. 30 and 0.8 on Aug. 1), PG 1246+586 (0.2 on Aug. 5), PKS 1424+240 (0.3 on Aug. 3), PKS 2155-304 (0.1 on Aug. 4), and PKS 2255-282 (0.4 on Jul. 31).

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.


Friday, August 3, 2012

Fermi LAT weekly report N. 216


Covered period: 2012.Jul.23 - 2012.Jul.29
LAT Mission week: 216.57 - 217.57

  • Mkn 421 detected everyday this week reaching a peak flux of 0.9 X 10-6 on July 29 2012
  • PKS 1424-418 detected almost every day this week peaking at 1.4 X 10-6 on July 24 2012
  • BL Lac detected on July 23 2012 in conjunction with a radio/optical flare see Atel#4271
  • PKS 2326-502 and PKS 2233-148 detected on multiple days during the week with fluxes below 1 X 10-6
  • PKS 2345-16,SBS 0846+513, 4C +21.35, S4 0218+35, S5 0716+71, PKS 0244-470, NRAO 676, PKS 2155-304, B3 1343+451, 3C 66A, OG 050, PMN J2345-1555, PKS 2255-282 detected once or twice during 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:
- M. Dutka (ditko86[at]gmail.com) for generic information related to this week
- Contact persons on this page for individual sources cited above.