Very High Energy Observations of Gamma-ray Bursts with STACEE

Details Very High Energy Observations of Gamma-ray Bursts with STACEE Very High Energy Observations of Gamma-ray Bursts with STACEE

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...722..862j&link_type=abstract

The Astrophysical Journal, Volume 722, Issue 1, pp. 862-870 (2010).

Astronomy and Astrophysics

Astronomy

Gamma-Ray Burst: General, Gamma-Ray Burst: Individual: Grb 050509B Grb 050607, Gamma Rays: General

Scientific paper

Gamma-ray bursts (GRBs) are the most powerful explosions known in the universe. Sensitive measurements of the high-energy spectra of GRBs can place important constraints on the burst environments and radiation processes. Until recently, there were no observations during the first few minutes of GRB afterglows in the energy range between 30 GeV and ~1 TeV. With the launch of the Swift GRB Explorer in late 2004, GRB alerts and localizations within seconds of the bursts became available. The Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) was a ground-based, gamma-ray telescope with an energy threshold of ~150 GeV for sources at zenith. At the time of Swift's launch, STACEE was in a rare position to provide >150 GeV follow-up observations of GRBs as fast as three minutes after the burst alert. In addition, STACEE performed follow-up observations of several GRBs that were localized by the HETE-2 and INTEGRAL satellites. Between 2002 June and 2007 July, STACEE made follow-up observations of 23 GRBs. Upper limits are placed on the high-energy gamma-ray fluxes from 21 of these bursts.

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