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Extended emission in short gamma-ray bursts registered by SPI-ACS of INTEGRAL observatory

Extended emission in short gamma-ray bursts registered by SPI-ACS of INTEGRAL observatory. Pavel Minaev 1, 2 , Alexei Pozanenko 1 , Vladimir Loznikov 1 1- Space Research Institute (Moscow, Russia) 2- Moscow State University (Moscow, Russia). GRB duration classification. ≤.

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Extended emission in short gamma-ray bursts registered by SPI-ACS of INTEGRAL observatory

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  1. Extended emission in short gamma-ray bursts registered by SPI-ACS of INTEGRAL observatory Pavel Minaev 1, 2, Alexei Pozanenko 1, Vladimir Loznikov 1 1- Space Research Institute (Moscow, Russia) 2- Moscow State University (Moscow, Russia)

  2. GRB duration classification ≤

  3. Data selection and analyzed groups of events Data selection: • We have formed the list of short gamma-ray bursts, registered by SPI-ACS INTEGRAL in 2002-2007,confirmed by other space-borne experiments (Swift, Konus, HETE etc), which consists of 86 events. • Heavy particle triggers have been selected. Analyzed groups of events: • Confirmed short GRBs from our catalog(hereafter shown by black color) • Unconfirmedshort GRBs with T90<2s (blue color) • Unconfirmedshort GRBs with T90≤0.05s (green color) • Heavy particle triggers (red color).

  4. Data analysis • Alignment of time profiles against main peak • Approximation of background by a linear law • Subtraction of background model from time profile • Calculation of averaged time profile for each group of events.

  5. Time profile ofGRB060221

  6. Averaged time profiles of 2 groups of short events, registered by SPI-ACS INTEGRAL

  7. Averaged time profiles of 2 groups of short events, registered by SPI-ACS INTEGRAL ≤

  8. Log N – Log Cmax distribution - 3/2 ≤

  9. Conclusions • We have formed the list of short gamma-ray bursts, registered by SPI-ACS INTEGRAL in 2002-2007,confirmed by other space-borne experiments (Swift, Konus, HETE etc), which consists of 86 events. • The extended emission up to 25s after main peak has been foundin averaged light curves of both confirmed and unconfirmed short GRBs registered by SPI-ACS INTEGRALin energy band >80keV • The extended emission of the GRBs registered by SPI-ACS is in energy range above ~80keV which may evidence against of explanation of extended emission as a rise of the afterglow. • The evidence for extended emission in averaged light curve of unconfirmed short duration events of SPI-ACS supports the same origin of unconfirmed events as short duration gamma-ray bursts and increases the rate of INTEGRAL short duration bursts in three times, and the portion of short burst may be up to 45% of all Gamma-Ray bursts detected by SPI-ACS. • The extended emission in averaged light curve of unconfirmed short duration events with T90≤0.05s of SPI-ACS may evidence against of explanation of these events as evaporations of primordial black holes and supports the assumption, that these events have the same origin as short duration gamma-ray bursts with T90<2s.

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