Tuesday, September 25, 2012

Fermi LAT Weekly Report N. 223




Covered period: 2012.September.10 - 2012.September.16
LAT Mission week: 223.57 - 224.57

  • The gravitationally lensed blazar S3 0218+35 had a daily flux of (1.0±0.2) X 10-6 on Sep 10 before fading away and was not detected for three days. It brightened again and was strongly detected the last three days of the week with daily flux in the range (1.4 - 3.8) X 10-6 with the peak on Sep 15. This blazar has been very active recently with an initial flare-up (ATel#4343) and a possible echo (ATel#4361) reported recently. This could represent a new flare and a Fermi TOO to observe another possible echo around Sep 25 is planned.
  • 4C 38.41 brightened from (0.8±0.2) X 10-6 on Sep 10 to (1.8±0.3) X 10-6 on Sep 15 before declining to (1.1±0.2) X 10-6 on September 16.
  • Apart from a dip down to (0.3±0.1) X 10-6 on Sep 11, S5 0716+71 stayed at about 1 X 10-61e-6 for the first five days of this week but was not detected on the last two days.
  • B3 1343+451 was detected on Sep 10 through Sep 15, with a daily flux between (0.5±0.1) X 10-6 and (0.8±0.2) X 10-6.
  • PKS 1424-418 was detected on Sep 10, 12 and 16 with a daily flux of (0.9±0.3) X 10-6, (1.0±0.4) X 10-6 and (0.7±0.2) X 10-6, respectively.
  • Mkn 421 was detected on September 10, 12, and 16 with daily flux between (0.4±0.1) X 10-6 and (0.6±0.2) X 10-6.
  • PKS 0116-219 was detected on Sep 12, 13, and 16 with daily flux between (0.5±0.1) X 10-6 and (0.7±0.2) X 10-6.
  • Sporadic daily detections of blazars (fluxes below 1 X 10-6 ): PKS 2326-502 (Sep 10, 12), PG 1553+113 (Sep 11), PKS 0250-225 (Sep 14), B2 0716+33 (Sep 13), PKS 2155-304 (Sep 15).
  • 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:
    - R. Ojha (roopesh.ojha[at]gmail.com) for generic information related to this week
    - Contact persons on this page for individual sources cited above.


Wednesday, September 19, 2012

Fermi LAT weekly report N. 222



Covered period: 2012.September.03 - 2012.September.09
LAT Mission week: 222.57 - 223.57

  • The gravitationally lensed blazar S3 0218+35 re-brightened on September 3, with a daily flux of (1.0±0.2) X 10-6, reaching its maximum on September 6, with a daily flux of (2.4±0.3) X 10-6. This flaring activity possibly represents the gravitational lens time delayed counterpart of the previous flaring event that started on August 25. See ATel#4361. The source continued to be detected on September 7, and 9 with a daily flux of (1.0±0.2) X 10-6 and (1.2±0.3) X 10-6, respectively. See ATel#4371.
  • Mkn 421 detected on September 3, 4, 5, 7, 8, and 9, with a daily flux between (0.2±0.1) X 10-6 and (0.5±0.2) X 10-6.
  • B3 1343+451 detected on September 3, 4, 5, 6, 7, and 9, with a daily flux between (0.4±0.1) X 10-6 and (0.9±0.2) X 10-6.
  • 4C 38.41 detected on September 3, 5, 7, and 8, with a daily flux between (0.5±0.2) X 10-6 and (0.9±0.2) X 10-6.
  • S5 0716+714 detected on September 6, 7, 8, and 9, with a daily flux between (0.4±0.1) X 10-6 and (1.1±0.2) X 10-6.
  • PKS 1124-186 detected on September 3, and 4, with a daily flux of (0.5±0.2) X 10-6.
  • PKS 2233-148 detected on September 6, and 9, with a daily flux of (0.5±0.2) X 10-6 and (0.4±0.1) X 10-6, respectively.
  • Sporadic daily detections of blazars (fluxes below 1 X 10-6 ): PKS 0250-225 (September 3), 1H 1013+498 (September 3), S4 0954+65 (September 4), PKS 2326-502 (September 7), PKS 1424-418 (September 9).
  • 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. Giroletti (giroletti[at]ira.inaf.it) and M. Orienti (orienti[at]ira.inaf.it) for generic information related to this week
    - Contact persons on this page for individual sources cited above.


Wednesday, September 12, 2012

Fermi LAT weekly report N.221


Covered period: 2012.Aug.27 - 2012.Sep.02
LAT Mission week: 221.57 - 222.57

  • Mkn 421 and B3 1343+451 were detected almost all week long with flux in the range 0.4-0.7 X 10-6 and 0.5-1.0 X 10-6, respectively.
  • Four other sources were detected at least in 3 days of the week with some trend in brightness. The flux decreased from 2.1 to 0.5 X 10-6 for PKS 1510-08 and from 0.9 to 0.5 X 10-6 for PKS 2233-148. On the contrary, the flux increased from 0.4 to 0.7 X 10-6 for 4C +38.41 and from 0.6 to 0.9 X 10-6 for PKS B1424-418.
  • Sporadic activity (fluxes above 1.0 X 10-6) was observed from S4 0218+35 (1.7 on Aug. 27) and 3C 273 (1.9 on Aug. 31).
  • Sporadic activity (fluxes below 1.0 X 10-6) was observed from BL Lacertae (0.5 and 0.8 on Aug. 27 and 28), PKS 2326–502 (0.4 and 0.7 on Aug. 28 and 30), PKS 0250-225 (0.4 on Aug. 30), PKS 0405-385 (0.4 on Aug. 31), PKS 0537-441 (0.2 on Sep. 02), B2 0716+33 (0.3 on Sep. 01), and 1H 1013+498 (0.1 on Sep. 01).

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.