Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Balloon-Borne Hard X-Ray Imaging and Future Surveys   Several payloads for hard X-ray (20-600 keV) imaging with coded aperture
telescopes have been developed for balloon flight observations of cosmic x-ray
sources. We briefly review the characteristics of these, particularly the
EXITE2 system. The recent NASA program to develop an extended long duration
(100d) balloon flight capability employing super-pressure balloons would allow
a qualitatively new hard x-ray imaging experiment: the Energetic X-ray Imaging
Survey Telescope-Long Integration Time Experiment (EXIST-LITE). The longer
continuous viewing times (per source) available from an LDB platform than from
low earth orbit would enable both surveys and objectives complementary to the
EXIST mission proposed for a MIDEX satellite. We summarize the scientific
objectives of EXIST-LITE, a possible instrumentation approach incorporating a
large area array of Cd-Zn-Te (CZT) detectors, and our program for the
development and balloon flight testing of relatively thick (5mm) CZT detector
arrays.

9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph