BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Observation of GRBs by the MAGIC Telescope DTSTART;VALUE=DATE-TIME:20070709T170500Z DTEND;VALUE=DATE-TIME:20070709T171700Z DTSTAMP;VALUE=DATE-TIME:20260715T103122Z UID:indico-contribution-98-0-566@cern.ch DESCRIPTION:Speakers: Dr. GARCZARCZYK\, Markus (Max-Planck-Institut fuer P hysik\, Muenchen - GERMANY)\nThe MAGIC Telescope is the only IACT suited f or the observation of GRBs.\nThanks to its fast repositioning time and low energy threshold\, MAGIC has\nbeen able to perform observations of the pr ompt and early afterglow\nemission of several GRBs. Since the beginning of operations of Swift\nthe GRB scenario has changed\, both for what concern s the statistics of\nalerts and for the new discoveries on the delayed emi ssion.\nHere we present the new expectations of observation in the so call ed\n"Swift era" and the scientific results of two years of GRB observation \nby the MAGIC Telescope.\n\nhttps://indico.nucleares.unam.mx/event/4/sess ion/98/contribution/566 LOCATION:Merida\, Mexico Uxmal + Tulum (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/98/contribution/566 END:VEVENT BEGIN:VEVENT SUMMARY:Simultaneous observation of GRB060602B with the H.E.S.S. Air Chere nkov array DTSTART;VALUE=DATE-TIME:20070709T171700Z DTEND;VALUE=DATE-TIME:20070709T172900Z DTSTAMP;VALUE=DATE-TIME:20260715T103122Z UID:indico-contribution-98-0-464@cern.ch DESCRIPTION:Speakers: TAM\, Pak Hin (Landessternwarte\, ZAH\, University o f Heidelberg\, Germany)\nOn June 2\, 2006\, the Swift Burst Alert Telescop e (BAT) triggered a bursting event in\nthe 15-350 keV energy band which la sted ~9 sec. The burst position was being observed\nwith the H.E.S.S. arra y of four Imaging Atmospheric Cherenkov Telescopes (IACTs) at\nenergies ab ove 100 GeV throughout the duration of the burst\, and both before and\naf ter the burst. A total of ~5 hours of observation was obtained during that night.\nThis is the first simultaneous observation of a soft gamma-ray bu rsting event with an\nIACT instrument. The Swift X-ray Telescope detected an X-ray counterpart starting\nfrom 83 sec after the BAT trigger. No optic al/infrared counterpart was found. Due to\nthe very soft BAT spectrum of t he burst compared to other Swift gamma-ray bursts\n(GRBs) and its proximit y to the galactic center\, the burst might have been caused by\na galactic X-ray burster (e.g. a low-mass X-ray binary)\, although the possibility o f\nit being a cosmological GRB cannot be ruled out. We will discuss the im plications of\nthe observational data according to different bursting scen arios.\n\nhttps://indico.nucleares.unam.mx/event/4/session/98/contribution /464 LOCATION:Merida\, Mexico Uxmal + Tulum (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/98/contribution/464 END:VEVENT BEGIN:VEVENT SUMMARY:Blind Search for Transient Bursts of Very High Energy Gamma-Rays U sing Milagro DTSTART;VALUE=DATE-TIME:20070709T172900Z DTEND;VALUE=DATE-TIME:20070709T174100Z DTSTAMP;VALUE=DATE-TIME:20260715T103122Z UID:indico-contribution-98-0-674@cern.ch DESCRIPTION:Speakers: Mr. VASILEIOU\, Vlasios (Department of Physics\, Uni versity of Maryland\, College Park\, MD 20742)\nMilagro is a water-Cherenk ov detector capable of observing air showers produced by gamma- rays. The wide field of view (~2 sr) and high duty cycle (>90%) of Milagro make it ideal for searching for transient very high energy emission. We will repor t on the results of a blind search of the Milagro data for very high energ y ranging from 160 μs to 6 minutes. While this analysis is primarily aime d at detecting -ray bursts (GRBs)\, it could also be sensitive to other phenomena like primordial black-hole evaporation and soft gamma -ray repea ters. No trigger\nfrom another instrument is required\, instead the entire reconstructed data set is systematically searched in time\, space and emi ssion duration. Four years of Milagro data are searched\, which correspond s to 2920 sr days of exposure. While the peak sensitivity of Milagro is ab ove 1 TeV\, the detector has substantial effective area at lower energies (~50 m^2 at 100 GeV\, ~2500 m^2 at 1 TeV).\n\nhttps://indico.nucleares.una m.mx/event/4/session/98/contribution/674 LOCATION:Merida\, Mexico Uxmal + Tulum (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/98/contribution/674 END:VEVENT BEGIN:VEVENT SUMMARY:Search for 1-100 GeV Emission from Gamma-Ray Bursts Using Milagro DTSTART;VALUE=DATE-TIME:20070709T174100Z DTEND;VALUE=DATE-TIME:20070709T175300Z DTSTAMP;VALUE=DATE-TIME:20260715T103122Z UID:indico-contribution-98-0-689@cern.ch DESCRIPTION:Speakers: Mr. AUNE\, Taylor (University of California\, Santa Cruz)\nMilagro is a wide field (2 sr) high duty cycle (>90%) ground based water Cherenkov\ndetector built to observe extensive air showers produced by high energy particles\ninteracting in the Earth's atmosphere. Milagro r ecords extensive air showers in the\nenergy range 100 GeV to 100 TeV\, as well as the counting rates of the individual\nphotomultiplier tubes in the detector. The individual tube counting rates can be used\nto detect trans ient emission above ~1 GeV by the temporary increase in secondary\nshower particles reaching the ground. We have used the counting rate data to sear ch\nfor high energy emission from a sample of about one hundred gamma-ray bursts (GRB)\ndetected since the beginning of 2000 by BATSE\, BeppoSax\, H ETE-2\,\nINTEGRAL\, Swift or the IPN. No evidence for emission from the G RBs was found.\nConsidering absorption by the extragalactic background lig ht\, upper limits on the\nfluence at four redshifts are determined for bur sts at unknown distances. For bursts\nwith known redshifts\, fluence upper limits in the energy range 1-100 GeV as low as\n8e-6 erg cm^-2 are obtain ed.\n\nhttps://indico.nucleares.unam.mx/event/4/session/98/contribution/68 9 LOCATION:Merida\, Mexico Uxmal + Tulum (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/98/contribution/689 END:VEVENT BEGIN:VEVENT SUMMARY:Gamma-Ray Burst Follow-up Observations with STACEE During 2003-200 7 DTSTART;VALUE=DATE-TIME:20070709T175300Z DTEND;VALUE=DATE-TIME:20070709T180500Z DTSTAMP;VALUE=DATE-TIME:20260715T103122Z UID:indico-contribution-98-0-409@cern.ch DESCRIPTION:Speakers: JARVIS\, Alexander (University of California\, Los A ngeles\, Los Angeles\, CA 90095)\nThe Solar Tower Atmospheric Cherenkov Ef fect Experiment (STACEE) is an atmospheric\nCherenkov telescope that uses a large mirror array to achieve a relatively low energy\nthreshold. For s ources with Crab-like spectra\, at high elevations\, the detector\nrespons e peaks near 100 GeV. Gamma-ray burst (GRB) observations have been a high \npriority for the STACEE collaboration since the inception of the experim ent. We\npresent the results of 20 GRB follow-up observations ranging fro m 3 minutes to 15\nhours after the burst triggers. Where redshift measure ments are available\, we place\nconstraints on the intrinsic high-energy s pectra of the bursts.\n\nhttps://indico.nucleares.unam.mx/event/4/session/ 98/contribution/409 LOCATION:Merida\, Mexico Uxmal + Tulum (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/98/contribution/409 END:VEVENT BEGIN:VEVENT SUMMARY:The Potential of GLAST in Observing Features in the High-Energy Sp ectra of GRBs DTSTART;VALUE=DATE-TIME:20070709T180500Z DTEND;VALUE=DATE-TIME:20070709T181700Z DTSTAMP;VALUE=DATE-TIME:20260715T103122Z UID:indico-contribution-98-0-1026@cern.ch DESCRIPTION:Speakers: KOMIN\, Nukri (LPTA\, Université Montpellier 2\, CN RS/IN2P3\, Montpellier\, France)\nGLAST is a gamma-ray mission which will be launched in November 2007. It is equipped\nwith the GLAST Burst Monitor (GBM) which detects Gamma-Ray Bursts (GRBs) with high\nreliability and pr ovides a position and energy spectrum in the range between 10 keV\nand 30 MeV. The Large Area Telescope (LAT) will observe photons with energies fro m 20\nMeV up to more than 300 GeV. With GLAST it will be possible to study the spectra of\nGRBs over 7 orders of magnitude in energy and for the fir st time in the energy band\nabove several tens of GeV.\n\nFrom the high-en ergy part of GRB spectra new insights into the bursts physics can be\nexpe cted. Emission due to Inverse Compton scattering of electrons or due to\ni nteractions of hadrons would point to particles accelerated in the jets of the GRBs.\nA cut-off of the spectrum would allow to study internal absorp tion of gamma-rays in\nthe burst and external attenuation in interaction w ith the EBL.\n\nWe will present the study of simulated GRBs with respect t o features in the\nhigh-energy spectrum. We will discuss the performance o f GLAST of detecting cut-offs\nand additional high-energy emission.\n\nhtt ps://indico.nucleares.unam.mx/event/4/session/98/contribution/1026 LOCATION:Merida\, Mexico Uxmal + Tulum (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/98/contribution/1026 END:VEVENT BEGIN:VEVENT SUMMARY:Photon spectra from final stages of a primordial black hole evapor ation in different theoretical models DTSTART;VALUE=DATE-TIME:20070709T181700Z DTEND;VALUE=DATE-TIME:20070709T182900Z DTSTAMP;VALUE=DATE-TIME:20260715T103122Z UID:indico-contribution-98-0-505@cern.ch DESCRIPTION:Speakers: Prof. BUGAEV\, Edgar (Institute for Nuclear Research \, Moscow\, Russia)\nPossibilities of an experimental search for gamma-ray bursts from primordial \nblack hole (PBH) evaporations in space are recon sidered. It is argued that the \ncorresponding constraints which can be o btained in experiments with cosmic \nray detectors strongly depend on theo retical approach used for a description of \nthe PBH evaporation process. Predictions of several theoretical models for \ngamma-ray spectra from fin al stages of PBH life (integrated over time) are given.\n\nhttps://indico. nucleares.unam.mx/event/4/session/98/contribution/505 LOCATION:Merida\, Mexico Uxmal + Tulum (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/98/contribution/505 END:VEVENT END:VCALENDAR