Research & Science Home ESA Public Web Site Sci-Tech Portal ESA Intranet     
Astrophysics Missions Planetary Exploration Missions Solar Terrestrial Science Missions Fundamental Physics Missions Science Faculty

About COS-B
COSB Overview
Orbit and Operation
Gamma Ray Telescope
Scientific Results
Restricted Items
IT Services
Document Portal
My Portal
Restricted Access Logon
Restricted Search (Guest)

Scientific Results

One of the best known results of Cos-B was the 2CG catalogue of point sources (Ref.3). This early catalogue was based on the selected data from only 30 observations made during the first three years of operation. It was searched for the presence of discrete, or localised, sources of gamma radiation under the assumption of a flat, or smoothly varying background. Thus 25 candidate sources were reported.

In view of the availability of the total mission data as well as more realistic background models, the interpretation of these enhancements has evolved rapidly. In the following pages, reference to the historical designation of the sources in the 2CG catalogue is adhered to for convenience.

Detailed Results

Where to find the data

The COS-B event files are available for world wide access within the EXOSAT Database

They are presently in

and have the following naming convention:
where H is ether N or S depending on whether the declination is north or south, and NN is a two digit number running from 00 to 64, for all 65 observations. (e.g CB2251S18P41.evt was the 42nd observation, and the source coordinates are RA 2251 DEC -18). If you have difficulties with this convention, let us know.

Using the COS-B files

To make use of the COS-B files, copy them to a node which has FTOOLS installed and then run the F2DHISTO FTOOLS utility to create the fits image, which can then be read directly with SAOIMAGE.

The COS-B Database - db_cosb:[phot]

All the Cos-B data were subjected to a consistent analysis and selection process and compiled into a single data-set. The final database (which is available to the public) contains 200 000 events in the energy range 50 MeV - 5 GeV. This corresponds to an average count rate 10 events per sq. deg of observed sky.

Supplied with the database is the full information on sensitivity which exhibited variations ±25% over 6.8 years. The background which varied in phase with the solar cycle and with pointing direction can be taken account of using suitable derived background parameters supplied with the database (Ref.2).


     Copyright © 2014 European Space Agency. All rights reserved.
This page was first created on 29 October, 2003 and was last updated on 10 December, 2013.
Password Synchronization

The RSSD Web Portal provides a single login facility to simplify access to several other applications within this site.

The login facility has detected that you have passwords to one or more of these other systems (Livelink, Mantis, CVS, etc.) which do not match your current LDAP password.

By clicking on [SYNCHRONIZE] you will be able to reset all these passwords and bring them into line with your main portal password with no further effort on your part.

Synchronizing Passwords - Please Wait

Logging In - Please Wait