Thursday, February 23, 2012

Fermi LAT weekly report N. 193



Covered period: 2012.February.13 - 2012.February.19

LAT Mission week: 193.57 - 194.57





  • PKS 1510-08 was detected everyday with daily flux reaching a peak of (4.9±0.5) X 10-6 on Feb. 17. By Feb. 18, the daily flux had declined to the level of (3.0±0.4) X 10-6.

  • PKS 0454-234 was detected four times during the week and reached a daily flux peak of (1.1±0.2) X 10-6 on Feb 15 and maintained a daily flux at slightly below this level for the next two days. A GCN Notice was issued about this source on Feb. 16 as the flux of the source had increased by 5 sigma to this peak value on the timescale of 1 day. No ATel was issued as a GCN Notice had been issued and a previous ATel for this source had been issued in October for a higher flux.

  • PKS 0402-362 was detected almost everyday with daily fluxes ranging from (0.4±0.1) X 10-6 to a peak value of (1.1±0.2) X 10-6 reached on Feb. 18.

  • Sporadic activity (fluxes below 1 X 10-6): B3 1343+451, PKS 2123-463, PKS 2326-502, 4C +55.17, PKS 0716+714, PKS 2255-282, PKS 1424+240, Mkn 421, PKS B1424-418, PKS 0537-441, PMN J0531-4827, PKS 1424-41, BL Lacertae.



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:

- T. Venters (toni.venters[at]gmail.com) for generic information related to this week

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




Thursday, February 16, 2012

Fermi LAT weekly report N.192



Covered period: 2012.February.06 - 2012.February.12

LAT Mission week: 192.57 - 193.57





  • PKS 1510-08 was strongly detected every day with daily flux reaching a peak of (3.9±0.5) X 10-6 on Feb 7th before declining to (2.3±0.4) X 10-6 on Feb 11th.

  • TXS 0059+581 was detected twice and reached a daily flux of (1.0±0.5) X 10-6 on Feb 10th. No ATel was issued, however, as the community had recently been alerted to its activity through ATel 3864 issued on Jan 13th.

  • S5 0716+71 was detected daily from Feb 6th through 10th with fluxes around the (0.5±0.1) X 10-6 level.

  • PKS 0454-234 was detected every day with daily flux at the (0.6±0.2) X 10-6 level.

  • Sporadic daily detections of blazars (fluxes below 1 X 10-6): B2 1520+31, B3 1343+451, S4 1030+61, PKS 1622-253, PKS 2345-16, PKS 0402-362, PKS 1424-41, PKS 0537-441, 4C 28.07, Mrk 421, PKS 2255-282, PKS 2326-502, TXS 1700+685.



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:

- Roopesh Ojha (roopesh.ojha[at]gmail.com) for generic information related to this week

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




Wednesday, February 8, 2012

Fermi LAT weekly report N.191



Covered period: 2012 January 30- 2012 February 5
LAT Mission week: 191.57 - 192.57





  • PKS 1510-08 was detected all week with daily flux between (2.3+/-0.4)X 10-6 and (5.3+/-0.6)X 10-6.

  • PKS 1313-333 was detected on January 31 and February 1 with daily flux of (0.7+/-0.2)X 10-6 and (0.3+/-0.1)X 10-6, respectively.

  • PKS 0454-234 was detected three times on February 2 and February 4-5 with fluxes between (0.4+/-0.1)X 10-6 and (0.8+/-0.2)X 10-6.

  • S5 0716+714 was detected was detected on February 3 and 4 with daily flux of (0.7+/-0.2)X 10-6 and (0.4+/-0.1)X 10-6, respectively.

  • Sporadic activity (fluxes below 1 X 10-6): S4 1030+61 (Jan 31), Mrk 421 (Feb 1), B3 1343+451 (Feb 1), PKS 0244-470 (Feb 2), B2 1520+31 (Feb 3), PKS 2326-502 (Feb 4).



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:
- E. Torresi (torresi[at]iasfbo.inaf.it) for generic information related to this week
- Contact persons on this page for individual sources cited above.



Friday, February 3, 2012

Fermi LAT weekly report N. 190



Covered period: 2012 January 23-29
LAT Mission week: 190.57 - 191.57




  • A long-lasting M8.7-class solar flare was detected by the LAT on January 23, 2012. Significant gamma-ray emission above 100 MeV was detected in the 1-day time interval and three 6h time intervals suggesting temporally extended gamma-ray emission. Between 06:00 UT and 09:00 UT, with a flux of (24+/-3)x10^-6 photons cm^-2 s^-1, it overwhelmed the flux of the Vela pulsar and represented a factor of about 50 greater than the flux of the solar disk for the quiet Sun (see ATel#3886). This very bright gamma-ray activity was produced by the strong solar flare erupting on the Sun's northeastern hemisphere at 03:59 UT, originated from sunspot 1402, characterized by a very fast coronal mass ejection (CME) partially Earth directed. This produced therefore the strongest flare and radiation storm since 2005 bombarding our Earth.  A further X-class solar flare was detected in gamma-rays by the LAT on January 27.

  • LAT detected a GeV flare (daily-bin flux about 10^-6 photons cm^-2 s^-1) from a possible new extragalactic gamma-ray source (Fermi J0052+1110) on January 29, 2012. The preliminary best-fit location of the source is R.A.=13.09 deg,  Dec:11.16 deg (J2000) with a 68% containment radius of 37 arcmin. Although the error region is large, based on the current knowledge, it contains no members of known gamma-ray-producing object classes (see ATel#3904). Multiwavelength observations of the region will be useful to add information and help in identify new blazars for example.

  • PKS 1510-08 and B2 1520+31 in high state during the week (around or above the daily flux level of 10^-6 photons cm^-2 s^-1). PKS 1510-08 was in flaring activity reaching a daily flux level of about 2.4x10^-6 photons cm^-2 s^-1 on January 28.

  • PKS 1424-41, Mkn 421, GC 0109+224, PKS 0537-441, PKS 0521-36, 4C +28.07, B3 1343+451, B2 2155+31, PKS 1244-255, NGC 1275, PKS 0454-234, PKS 2326-502, PMN J0531-4827, 3C 66A, the other blazars of the week detected at least in one daily bin (all with flux below 10^-6 photons cm^-2 s^-1)


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.