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In the framework of the model that uses black holes endowed withelectromagnetic structure (EMBH) as the energy source, we study how anelementary spike appears to the detectors. We consider the simplest possiblecase of a pulse produced by a pure $e^+e^-$ pair-electro-magnetic plasma, thePEM pulse, in the absence of any baryonic matter. The resulting time profilesshow a {\em Fast-Rise-Exponential-Decay} shape, followed by a power-law tail.This is obtained without any special fitting procedure, but only by fixing theenergetics of the process taking place in a given EMBH of selected mass,varying in the range from 10 to $10^3$ $M_\odot$ and considering therelativistic effects to be expected in an electron-positron plasma graduallyreaching transparency. Special attention is given to the contributions from allregimes with Lorentz $\gamma$ factor varying from $\gamma=1$ to $\gamma=10^4$in a few hundreds of the PEM pulse travel time. Although the main goal of thispaper is to obtain the elementary spike intensity as a function of the arrivaltime, and its observed duration, some qualitative considerations are alsopresented regarding the expected spectrum and on its departure from the thermalone. The results of this paper will be comparable, when data will becomeavailable, with a subfamily of particularly short GRBs not followed by anyafterglow. They can also be propedeutical to the study of longer bursts inpresence of baryonic matter currently observed in GRBs.Comment: 14 pages, 18 figures, to appear in Astronomy & Astrophysic

The elementary spike produced by a pure e+e- pair-electromagnetic pulse from a Black Hole: The PEM Pulse

The elementary spike produced by a pure e⁺e^- pair-electromagnetic pulse from a Black Hole: The PEM Pulse