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Chandra      |             CC     XX XX    OO OO          | CXC
Electronic   |            CC       XXX    OO   OO         | Number 72
Bulletin     |             CC     XX XX    OO OO          | April
             |              CCC  XX   XX    OOO           | 2008
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Welcome to the Chandra X-ray Center's Electronic News Bulletin Number 72.

CXC Web site: cxc.harvard.edu

If you would like to unsubscribe from this alias, simply reply to this message
to let us know.  

Please use this website to update your address or email: 
          http://cxc.harvard.edu/cdo/udb/userdat.html

Contents:

1.   Abstract Deadline for Radio Galaxies in the Chandra Era 

2.   CIAO 4.0.2 patch released

3.   Chandra Source Detection and Cosmic-Ray Afterglows

4.   Mac OS X platforms: FITS table file writing slowness with NFS-mounted 
disks

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Item 1.   Abstract Deadline for Radio Galaxies in the Chandra Era
=================================================================


The Chandra X-ray Center will be hosting a Science Workshop
	Radio Galaxies in the Chandra Era 
	8-11 July, 2008
in Cambridge, MA at the Harvard Student Organization Center at Hilles,
just across Garden Street from the CfA.  

The ***DEADLINE*** for both registration and abstract submission for 
contributed talks and poster presentations is
	Wednesday April 30, 2008  	 

Please access the workshop webpage 
             http://cxc.harvard.edu/radiogals08
for details including a list of Invited Speakers, a form for
registration/abstract submission, and information about
accommodations.

	
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Item  2.  CIAO 4.0.2 patch released 
===================================


CIAO 4.0 has been patched to CIAO 4.0.2 as of Wednesday 16 April 2008.
This patch is addressed *only* to Mac OS X Intel users and enables CIAO 
to run on Mac OS X 10.5 (Leopard) Intel.
The patch is optional for 10.4 (Tiger) Intel machines: users who choose 
to install it will get updated versions of ds9 and XPA, as well as a fix 
to the Data Model.
Additionally, there is an updated standalone version of ObsVis for Mac 
OS X Intel (see the ObsVis website for details at 
http://cxc.harvard.edu/obsvis )

Full release notes can be found at
http://cxc.harvard.edu/ciao/releasenotes/ciao_4.0.2_release.html

The patch can be downloaded from
http://cxc.harvard.edu/ciao/download/
and
http://ledas-cxc.star.le.ac.uk/ciao/download/

               -----------------------------------

As always please send questions and requests for enhancements to the CXC
HELPDESK (http://cxc.harvard.edu/helpdesk/)

CIAO is a collaborative effort between the SAO/CXC Science Data
Systems, the SAO/CXC Data Systems, and MIT/CXC personnel.

Antonella Fruscione (for the CIAO development team)

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Item  3.  Chandra Source Detection and Cosmic-Ray Afterglows
============================================================


CIAO users who are trying to detect sources of about 10 counts or less should 
be aware of potential confusion with cosmic-ray afterglows that have not been 
removed from the data.

The Cosmic-Ray Afterglows why topic explains the limitations of the current 
tools and describes analysis tips to help eliminate more of the afterglows:
     http://cxc.harvard.edu/ciao/why/afterglow.html

A new algorithm to flag the small-count afterglows is in development.  This 
algorithm is expected to identify afterglows with as few as four events.

Elizabeth Galle for the CIAO team

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Item 4.   Mac OS X platforms: FITS table file writing slowness with 
NFS-mounted disks
===============================================================================
======


FITS table file writing through the CXC Data Model slows by a significant 
factor on Mac OS X machines - both 10.4 (Tiger) and 10.5 (Leopard) - when the 
data is accessed via a networked file system (NFS) mount. This issue does not 
affect Solaris or Linux platforms.

The bug page for this issue has details and workarounds to alleviate the 
problem:
     http://cxc.harvard.edu/ciao/bugs/nfsmount.html


Elizabeth Galle for the CIAO team 


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