Smith AJ, Atkins R, Benbow W, Berley D, Chen ML, Coyne DG, Dingus BL, Dorfan DE, Ellsworth RW, Evans D, et al.Results from the Milagrito experiment, in American Institute of Physics Conference Series. Vol 515. ; 2000 :441–447.
Schönfelder V, Bennett K, Blom JJ, Bloemen H, Collmar W, Connors A, Diehl R, Hermsen W, Iyudin A, Kippen RM, et al.Summary of the first COMPTEL source catalogue, in American Institute of Physics Conference Series. Vol 510. ; 2000 :596–600.
McEnery JE, Atkins R, Benbow W, Berley D, Chen ML, Coyne DG, Dingus BL, Dorfan DE, Ellsworth RW, Evans D, et al.Evidence for TeV emission from GRB 970417a, in Gamma-ray Bursts, 5th Huntsville Symposium. Vol 526. ; 2000 :240–244.
We report on recent three-dimensional imaging performance and detection efficiency measurements obtained with 5 mm thick prototype CdZnTe detectors fabricated with orthogonal coplanar anode strips. In previous work, we have shown that detectors fabricated using this design achieve both very good energy resolution and sub-millimeter spatial resolution with fewer electronic channels than are required for pixel detectors. As electron-only devices, like pixel detectors, coplanar anode strip detectors can be fabricated in the thickness required to be effective imagers for photons with energies in excess of 500 keV. Unlike conventional double-sided strip detectors, the coplanar anode strip detectors require segmented contacts and signal processing electronics on only one surface. The signals can be processed to measure the total energy deposit and the photon interaction location in three dimensions. The measurements reported here provide a quantitative assessment of the detection capabilities of orthogonal coplanar anode strip detectors.
O Neill TJ, Bhattacharya D, Dixon DD, Polson M, White RS, Zych AD, Ryan J, McConnell M, Macri J, Samimi J, et al.The TIGRE gamma-ray telescope, in American Institute of Physics Conference Series. Vol 510. ; 2000 :804–808.
Milagrito, a detector sensitive to gamma-rays at TeV energies, monitored the northern sky during the period February 1997 through May 1998. With a large field of view and high duty cycle, this instrument was used to perform a search for TeV counterparts to gamma-ray bursts. Within the Milagrito field of view 54 gamma-ray bursts at keV energies were observed by the Burst And Transient Satellite Experiment (BATSE) aboard the Compton Gamma-Ray Observatory. This paper describes the results of a preliminary analysis to search for TeV emission correlated with BATSE detected bursts. Milagrito detected an excess of events coincident both spatially and temporally with GRB 970417a, with chance probability \$2.8 \times 10^-5\$ within the BATSE error radius. No other significant correlations were detected. Since 54 bursts were examined the chance probability of observing an excess with this significance in any of these bursts is \$1.5 \times 10^-3\$. The statistical aspects and physical implications of this result are discussed.
We use all COMPTEL data from the beginning of the CGRO mission (April '91) up to the end of CGRO Cycle 6 (November '97) to carry out all-sky point source analyses in the four standard COMPTEL energy bands for different time periods. We apply our standard maximum-likelihood method to generate all-sky significance and flux maps for point sources by subtracting off the diffuse emission components via model fitting. In addition, fluxes of known sources have been determined for individual CGRO Phases/Cycles to generate lightcurves with a time resolution of the order of one year. The goal of the analysis is to derive quantitative results – significances, fluxes, light curves – of our brightest and most significant sources such as 3C 273, and to search for additional new COMPTEL sources, showing up in time-averaged maps only.