BROADBAND, TIME-DEPENDENT, SPECTROSCOPY OF THE BRIGHTEST BURSTS OBSERVED BY BATSE LAD AND EGRET TASC

Journal Article · Sun May 10 04:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/696/2/2155; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21300636

Gonzalez, M M; Carrillo-Barragan, M ^[1]; Dingus, B L ^[2]; Kaneko, Y ^[3]; Preece, R D; Briggs, M S ^[4]

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1. Instituto de AstronomIa, Universidad Nacional Autonoma de Mexico, Mexico 04510 (Mexico)
2. Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
3. Universities Space Research Association, NSSTC, Huntsville, AL 35805 (United States)
4. Physics Department, University of Alabama, Huntsville, AL 35899 (United States)

The Energetic Gamma Ray Experiment Telescope (EGRET) calorimeter, Total Absorption Shower Counter (TASC), was triggered by the Burst And Transient Source Experiment (BATSE) and thus observed several bursts in the energy range of 1-200 MeV. The analysis of combined BATSE Large Area Detector and EGRET TASC data have been developed and discussed previously. Spectroscopy of GRB941017 based on this analysis uncovered an MeV component that would be hidden in the brightness of the synchrotron component in a time-integrated spectrum of the whole burst, while separation into shorter time intervals allowed a unique identification of a new component different from the synchrotron component. In this paper the spectral temporal evolution of the 68 brightest long BATSE bursts, in the broadest energy range yet reported, is studied using the analysis used for GRB941017. We consider the Band function to describe the spectra from keV to MeV energies. Only 21 of the 68 bursts showed MeV emission detectable by TASC. We observed three bursts that contained spectra with peak energy E {sub peak}>2 MeV.

• OSTI ID: 21300636
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 696; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABSORPTION
BRIGHTNESS
CALORIMETERS
COSMIC GAMMA BURSTS
DATA ANALYSIS
GAMMA RADIATION
MEV RANGE
SHOWER COUNTERS
SPECTRA
SPECTROSCOPY
TELESCOPES
TIME DEPENDENCE