Friday, November 27, 2009

Update on GeV activity and spectral hardness of GB6 B1310+4844

The LAT source positionally consistent with the flat spectrum radio quasar GB6 B1310+4844 (commonly known as GB1 1310+487 or TXS 1310+487) continues to show strong and variable activity (ATEL 2306, also see ATEL 2310, ATEL 2311). In the daily run for November 26, the flux(E>100MeV) = 1.2 ± 0.2 10-6 photons cm-2 s-1 and photon index=1.8 ± 0.1 (errors are statistical only; results are preliminary from the automated analysis processing). We note that the spectrum is very hard for this type of source in the GeV band. We strongly encourage multiwavelength observations, in particular optical monitoring, of this object given the ongoing activity and GeV spectrum. The LAT contact person is Kirill Sokolovsky (ksokolov[at]

Note. All the flux values 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.

For questions and comments please contact:

- Liz Hays (elizabeth.a.hays[at] or Lise Escande (escande[at] for generic information related to this week

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