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Multiwavelength observations of 3C 454.3 II. The AGILE 2007 December campaign
I. Donnarumma, G. Pucella, V. Vittorini +75
We report on the second AGILE multiwavelength campaign of the blazar 3C 454.3 during the first half of December 2007. This campaign involved AGILE, Spitzer, Swift,Suzaku,the WEBT c…
Multiwavelength Observations of Mrk 501 in 2008
D. Kranich, D. Paneque, A. Cesarini +16
The well-studied VHE (E >100 GeV) blazar Mrk 501 was observed between March and May 2008 as part of an extensive multiwavelength observation campaign including radio, optical, X-ra…
A glimpse of the end of the dark ages: the gamma-ray burst of 23 April 2009 at redshift 8.3
N. R. Tanvir, D. B. Fox, A. J. Levan +59
It is thought that the first generations of massive stars in the Universe were an important, and quite possibly dominant, source of the ultra-violet radiation that reionized the hy…
Swift observations of the very intense flaring activity of Mrk 421 during 2006: I. Phenomenological picture of electron acceleration and predictions for the MeV/GeV emission
A. Tramacere, P. Giommi, M. Perri +2
We present results from a deep spectral analysis of all the Swift observations of Mrk 421 from April 2006 to July 2006, when it reached its largest X-ray flux recorded until 2006.…
Swift observations of IBL and LBL objects
F. Massaro, P. Giommi, G. Tosti +5
BL Lacs are an enigmatic class of active galactic nuclei (AGNs), characterized by the non-thermal continuum typically attributed to synchrotron and inverse Compton emission. Depend…
Evidence for an anticorrelation between the duration of the shallow decay phase of GRB X-ray afterglows and redshift
G. Stratta, D. Guetta, V. D'Elia +3
One of the most intriguing features discovered by Swift is a plateau phase in the X-ray flux decay of about 70% of the afterglows of gamma-ray bursts (GRBs). The physical origin of…