Thursday, May 26, 2011

Fermi LAT weekly report N. 153

Covered period: 2011 May 9-15

LAT Mission week: 153.57-154.57

Highlights of this week:

Detection of gamma ray activity from blazar PKS 0208-512 with a flux of (1.1 +/- 0.3)E-6. This was reported in ATel #3338

CTA 102 brightened on May 11, up to a flux of (1.6 ± 0.4) E-6, which is above the level reported in a recent telegram from May 3 (ATel #3320)

Blazar SBS 1150+497 (also known as as 4C 49.22, OM 484) became active this week after a one month hiatus following a short flare on April 15 (ATEL #3313). Back then there were two possible AGN counterparts to the gamma-ray source, but follow-up observations have revealed a contemporaneous increase in flux at GeV, X-ray and NIR (ATEL#3317) wavelengths, which confirms the identification of the Fermi source with SBS 1150+497. A peak flux of (3.4 +/- 0.6)E-6 was observed by Fermi LAT during a 12hr interval on May 15, but since then the source has been detected at a more moderate flux of aprox. 1 E-6.

4C +38.41 remains bright this week, with daily fluxes consistently around 1.3 E-6 for most days and as high as ( 2.5 +/- 0.4) E-6 on May 15

Other daily detections of blazars this week: PKS 1244-255, 3C 279, 4C +28.07, PKS 0537-441, Mkn 421, PKS 2155-304, CRATES J1239+0443, 3C 454.3, BL Lac, PMN J2345-1555

Fluxes are in the unit of photons/cm2/s above 100 MeV. All errors are statistical only.

Note. All the flux reported above are by the Fermi LAT Automated Science Processing (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. Szostek (aszostek[at] and L. Reyes (lcreyes [at] for generic information related to this week

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

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