EGRET TASC Observations of the bright April 25, 1995 GRB

Catelli, J. R.; Dingus, B. L.; Schneid, E. J.

doi:10.1063/1.51735

Cited by 5 publications

(6 citation statements)

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“…One of the more surprising results of the Compton Gamma-Ray Observatory (CGRO) was the EGRET discovery of an 18 GeV photon associated with GRB 940217 (Hurley 1994). About a half-dozen bursts were seen over the course of the CGRO mission with photons above 100 MeV (Catelli 1998, Dingus 2003. Since the GRB spectral energy distribution at lower energies has been well characterized by a modified power law with peak fluxes at energies of the order of 200 KeV, the existence of photons at energies 10 4 times higher puts a significant constraint on any viable model of the GRB phenomenon.…”

Section: Introductionmentioning

confidence: 99%

SEARCHING FOR NEEDLES IN HAYSTACKS—USING THE FERMI /GBM TO FIND GRB γ-RAYS WITH THE FERMI /LAT DETECTOR

Akerlof

Zheng

McKay

2010

ApJ

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From the launch of the Fermi Gamma-ray Space Telescope to July 9, 2010, the Gamma-ray Burst Monitor (GBM) has detected 497 probable GRB events. Twenty-two of these satisfy the simultaneous requirements of an estimated burst direction within 52 • of the Fermi Large Area Telescope (LAT) boresight and a low energy fluence exceeding 5 µerg/cm 2 . Using matched filter techniques, the spatially correlated F ermi/LAT photon data above 100 MeV have been examined for evidence of bursts that have so far evaded detection at these energies. High energy emission is detected with great confidence for one event, GRB 090228A. Since the LAT has significantly better angular resolution than the GBM, real-time application of these methods could open the door to optical identification and richer characterization of a larger fraction of the relatively rare GRBs that include high energy emission.

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Section: Introductionmentioning

confidence: 99%

SEARCHING FOR NEEDLES IN HAYSTACKS—USING THE FERMI /GBM TO FIND GRB γ-RAYS WITH THE FERMI /LAT DETECTOR

Akerlof

Zheng

McKay

2010

ApJ

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“…Previous literature presents at least some evidence for a possible association of energetic gamma rays with low-energy GRBs. EGRET detected several GRBs which emitted high energy photons in the ∼ 100 MeV to 18 GeV range [2,3,12]. There have also been some results from the Tibet air shower array suggestive of gamma rays beyond the TeV range [1,8].…”

Section: Introductionmentioning

confidence: 99%

Search for sub-TeV gamma rays in coincidence with gamma ray bursts

et al. 2003

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Project GRAND is a 100m × 100m air shower array of proportional wire chambers (PWCs). There are 64 stations each with eight 1.29 m 2 PWC planes arranged in four orthogonal pairs placed vertically above one another to geometrically measure the angles of charged secondaries. A steel plate above the bottom pair of PWCs differentiates muons (which pass undeflected through the steel) from non-penetrating particles. FLUKA Monte Carlo studies show that a TeV gamma ray striking the atmosphere at normal incidence produces 0.23 muons which reach ground level where their angles and identities are measured. Thus, paradoxically, secondary muons are used as a signature for gamma ray primaries. The data are examined for possible angular and time coincidences with eight gamma ray bursts (GRBs) detected by BATSE. Seven of the GRBs were selected because of their good acceptance by GRAND and high BATSE fluence. The eighth GRB was added due to its possible coincident detection by Milagrito. For each of the eight candidate GRBs, the number of excess counts during the BATSE T90 time interval and within ±5• of BATSE's direction was obtained. The highest statistical significance reported in this paper (2.7σ) is for the event that was predicted to be the most likely to be observed (GRB 971110).

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“…The sensitivity for different durations can be easily obtained by multiplying K by √ ∆t. To compare the ARGO−YBJ expected sensitivity with real GRBs, the K vs. Γ values of 14 EGRET GRBs [2] are plotted in the same figures.…”

Section: Resultsmentioning

confidence: 99%

“…So far the only existing data reporting high energy γ-rays from GRBs come from the observations of EGRET (however, there are also possible TeV emissions claimed in the past by various ground-based experiments, in particular that from GRB970417a recorded by the Milagrito detector [1]). During its lifetime it detected 16 intense events, with a maximum photon energy of 18 GeV [2]. All their spectra show a power law behaviour without any cutoff, suggesting that a large fraction of GRBs could emit GeV or even TeV γ-rays.…”

Section: High Energy Emission From Grbsmentioning

confidence: 99%

The ARGO—YBJ Sensitivity to GRBs

Girolamo

Sciascio

Vernetto

2004

AIP Conference Proceedings

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ARGO−YBJ is a "full coverage" air shower detector under construction at the YangBa-Jing Laboratory (4300 m a.s.l., Tibet, P.R. of China). Its main goals are γ-ray astronomy and cosmic ray studies. In this paper we present the capabilities of ARGO−YBJ in detecting the emission from Gamma Ray Bursts (GRBs) at energies E > 10 GeV . 100 105 110 115 120 125 130 135 140 45 50 55 60 65 70 75 80 0 20 40 60 80 100 120 140 160 180 200 Space-Time projection 100 105 110 115 120 125 130 135 140 45 50 55 60 65 70 75 80 Pads Entries 534 Pads Entries 534 ARGO-YBJ (16 Clusters) Run = 537 -Ev = 905

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EGRET TASC Observations of the bright April 25, 1995 GRB

Cited by 5 publications

References 0 publications

SEARCHING FOR NEEDLES IN HAYSTACKS—USING THE FERMI /GBM TO FIND GRB γ-RAYS WITH THE FERMI /LAT DETECTOR

SEARCHING FOR NEEDLES IN HAYSTACKS—USING THE FERMI /GBM TO FIND GRB γ-RAYS WITH THE FERMI /LAT DETECTOR

Search for sub-TeV gamma rays in coincidence with gamma ray bursts

The ARGO—YBJ Sensitivity to GRBs

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