Wednesday, April 20, 2011

Fermi LAT weekly report N. 149



Covered period: 2011.April.11 - 2011.April.17

LAT Mission week: 149.57 - 150.57





  • A renewed increase of the gamma-ray activity from a source positionally consistent with the Crab Nebula was detected by Fermi-LAT starting from the period April 9-11, 2011 (ATel #3276).
    Fermi has interrupted all-sky scanning mode between 2011-04-12 16:47 UTC and 2011-04-19 15:49:43 UTC for a dedicated pointing observation of the Crab Nebula. The ATel #3276 promptly issued at the beginning of this new outburst phase triggered also early ToO observations by Swift (ATel #3279) and Chandra (ATel #3283).
    A subsequent extreme gamma-ray outburst was detected in the period April 14-16 (see ATel #3284), with a peak flux of (21.4 +/- 0.7) x10^-6 ph/cm2/sec (statistical errors only) on April 16, confirmed also by AGILE observations (ATel #3286).


  • 3C 279 was detected in a very high state on Apr. 17, with daily flux of (3.3+/-1.0)e-6.


  • Sporadic daily detections of blazars: PMN J2345-1555 (Apr. 11), PKS 1510-08 (Apr. 11), S5 0716+714 (Apr. 14), CRATES J0850+4854 (Apr. 14).



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:

- F. D'Ammando (dammando[at]ifc.inaf.it) for generic information related to this week

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




Sunday, April 17, 2011

Fermi LAT weekly report N. 148



Covered period: 2011 Apr.4-Apr.10 

LAT Mission week: 148.57 - 149.57






  • The latter half of this week saw the start of increased activity from the Crab Nebula with an increase in flux by a factor of >2, see ATel#3726. On the 9th, the daily flux reached (4.7 +/- 0.6) e-6 with a 6 hour flux of (5.7 +/- 0.7) e-6.



  • 3C454.3 was detected throughout the week with an average daily flux of 1.3e-6.



  • PKS 1622-253 exhibited a flare this week, detected on 5 days with an average daily flux of 1.2e-6 and reached a high flux of (1.5 +/- 0.4) e-6 on the 10th.



  • 1510-089 was detected at a high flux of (2.1 +/- 1.0) e-6 on the 10th.



  • PWN J2345-1555 was detected most days this week with an average daily flux of 0.7e-6



  • B2 2308+34 and 4C+38.41 were both detected on 3 days during the first half of the week with average daily fluxes of 1.2e-6 and 0.9e-6, respectively, while PKS 1520+31 was seen on 3 days in the second half of the week at an average daily flux of 0.9e-6.



  • Sporadic activity from 4C+01.01, 3C273, 3C279, Mrk421, PKS 2155-304, 1ES2322-409, PKS 0537-441, PKS 1502+106, PKS 1424+41 and CRATES J0742+5444.





Fluxes are in the units of photons/cm^2/s above 100 MeV.

Note. All the fluxes 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:

- A. Cannon (annacannon1984@gmail.com) for generic information related to this week

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


Thursday, April 7, 2011

Fermi LAT weekly report N. 147



Covered period: 2011 Mar.28-Apr3 

LAT Mission week: 147.57 - 148.57




  • Flare of S5 0836+71 (4C 71.07, z=2.218) on April 3, with daily flux (1.2+/-0.3)E-6. ATel#3260 issued. A high-z, luminous gamma-ray MeV-peaked blazar (being detected in the past by INTEGRAL, COMPTEL, EGRET), interesting for its intervening system, intrinsic absorbing environment and peculiarly-structured jet.

  • Flare of nearby blazar OX 169 (S3 2141+17, z=0.210) on March 30 (daily flux 1.2+/-0.3)E-6.

  • 3C 454.3 faded below the daily flux level of 1E-6 during the week.

  • Mkn 421 and PKS 0537-441 were rather active and detected all days (Mkn 421 below 0.4E-6, PKS 0537-441 reaching 0.7E-6 on April 3).

  • Other daily detection of blazars below daily flux level of 1E-6:
    RX J1509.7+5556, PKS 2155-304, B2 1520+31, PMN J2345-1555, 1ES 2322-409, 4C 14.23, 3C 66A, GB6
    J0742+5444
    .

  • GRB 110328B of March 28 is not detectable by the LAT using the standard 0.1-300 GeV dataset. Detectable if the lower energy threshold is reduced to 50 MeV
    (GCN 11835 issued).


Fluxes are in the units of photons/cm^2/s above 100 MeV.

Note. All the fluxes 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, April 5, 2011

Fermi LAT weekly report N.146



Covered period: 2011.Mar.21 - 2011.Mar.27

LAT Mission week: 146.57 - 147.57






  • 3C 454 detected between March 21 and 27 with daily flux in the range 1.8-5.3 X 10-6.

  • Mkr 421 detected almost all week with daily flux in the range 0.1-0.8 X 10-6.

  • Mkr 501 detected on March 24 and 25 with daily flux of 0.1 X 10-6 and 0.2 X 10-6, respectively.

  • CRATES J0742+5444 (GB6 J0742+5444) detected between March 23 and 26 with daily flux in the range 0.4-0.8 X 10-6.

  • Sporadic activity observed from PKS 0250-225, S5 0716+71, 4C +38.41. All fluxes below 1.0 X 10-6.


  • The high state of Cygnus X-3 on March 22 was reported by Fermi collaboration in Atel#3233. Furthermore, a TOO pointed mode observation for Cyg X-3 was performed by Fermi between 25 and 28 March.




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:

G. pivato (giovanna.pivato[at]pd.infn.it) for generic information related to this week

Contact persons on this page for individual sources cited above.




Monday, April 4, 2011

Fermi LAT weekly report N. 145



Covered period: 2011.Mar.14 - 2011.Mar.20

LAT Mission week: 145.57 - 146.57





  • 4C +38.41 Detected with daily flux greater than 1.0 X 10-6 on March 14,15 and 19. The peak flux was (2.1 +/- 0.4) X 10-6 on March 15th. Swift observations of this source were performed on March 16 to March 21

  • 3C454.3 Detected everyday during the week with flux between 3.0-4.0 X 10-6.

  • Sources with flux below 1.0 X 10-6 - 4C+21.35 flux = (0.8 +/- 0.3) X 10-6; PKS 0537-441 flux = (0.6 +/- 0.2) X 10-6 March 16, (0.5 +/- 0.2) X 10-6 March 18, (0.4 +/- 0.1) March 20; CRATES J0742+5444 flux = (0.9 +/- 0.2) X 10-6 March 17, (0.7 +/- 0.2) X 10-6 March 18, (0.4 +/- 0.2) X 10-6 March 20; B2 2308+34 flux = (0.3 +/- 0.1) X 10-6 March 18; CGRaBS J1033+6051 flux = (0.5 +/- 0.2) X 10-6 March 18



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:

- Michael Dutka (ditko86@gmail.com) for generic information related to this week

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