5,228,605 research outputs found
The CFHTLS Real Time Analysis System "Optically Selected GRB Afterglows"
We describe a wide and deep search for optical GRB afterglows on images taken
with MegaCAM at the Canada France Hawaii Telescope, within the framework of the
CFHT Legacy Survey. This search is performed in near real-time thanks to a Real
Time Analysis System called "Optically Selected GRB Afterglows", which has been
completely realized and installed on a dedicated computer in Hawaii. This
pipeline automatically and quickly analyzes Megacam images and extracts from
them a list of astrometrically and photometrically variable objects which are
displayed on a web page for validation by a member of the collaboration. In
this paper, we comprehensively describe the RTAS process. We also present
statistical results based on nearly one full year of operation, showing the
quality of the images and the performance of the RTAS. Finally, we compare the
efficiency of this study with similar searches, propose an ideal observational
strategy using simulations, and discuss general considerations on the searches
for GRB afterglows independently of the prompt emission. This is the first of a
series of two papers. A second paper will discuss the characterization of
variable objects we have found, as well as the GRB afterglow candidates and
their nature. We will also estimate or at least constrain the collimation
factor of GRB using the totality of the Very Wide Survey observations.Comment: 11 pages, 10 Figures, 5 Table
The Angstrom Project Alert System: real-time detection of extragalactic microlensing
The Angstrom Project is undertaking an optical survey of stellar microlensing
events across the bulge region of the Andromeda Galaxy (M31) using a
distributed network of two-meter class telescopes. The Angstrom Project Alert
System (APAS) has been developed to identify in real time candidate
microlensing and transient events using data from the Liverpool and Faulkes
North robotic telescopes. This is the first time that real-time microlensing
discovery has been attempted outside of the Milky Way and its satellite
galaxies. The APAS is designed to enable follow-up studies of M31 microlensing
systems, including searches for gas giant planets in M31. Here we describe the
APAS and we present a few example light curves obtained during its
commissioning phase which clearly demonstrate its real-time capability to
identify microlensing candidates as well as other transient sources.Comment: 4 pages, submitted to ApJ Letter
Real-Time Data Processing in the Muon System of the D0 Detector
This paper presents a real-time application of the 16-bit fixed point Digital
Signal Processors (DSPs), in the Muon System of the D0 detector located at the
Fermilab Tevatron, presently the world's highest-energy hadron collider. As
part of the Upgrade for a run beginning in the year 2000, the system is
required to process data at an input event rate of 10 KHz without incurring
significant deadtime in readout. The ADSP21csp01 processor has high I/O
bandwidth, single cycle instruction execution and fast task switching support
to provide efficient multisignal processing. The processor's internal memory
consists of 4K words of Program Memory and 4K words of Data Memory. In addition
there is an external memory of 32K words for general event buffering and 16K
words of Dual Port Memory for input data queuing. This DSP fulfills the
requirement of the Muon subdetector systems for data readout. All error
handling, buffering, formatting and transferring of the data to the various
trigger levels of the data acquisition system is done in software. The
algorithms developed for the system complete these tasks in about 20
microseconds per event.Comment: 4 pages, Presented and published at the 11th IEEE NPSS Real Time
Conference, held at Santa Fe, New Mexico, USA, from June 14-18, 199
Real-Time Systems: Reflections on higher education in the Czech Republic, Hungary, Poland and Slovenia
Real-time systems (An ICT definition)\ud
In real-time multiprocessing there is the extra requirement that the system complete its response to any input within a certain critical time. This poses additional problems, particularly in situations where the system is heavily loaded and is subject to many\ud
simultaneous demands. Real-time systems are always dedicated. Most systems are not real-time
Monocular tracking of the human arm in 3D: real-time implementation and experiments
We have developed a system capable of tracking a human arm in 3D and in real time. The system is based on a previously developed algorithm for 3D tracking which requires only a monocular view and no special markers on the body. In this paper we describe our real-time system and the insights gained from real-time experimentation
- …