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Chandra Electronic Bulletin No. 72

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             |              ccc  XX   XX    OOO           |
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

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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 


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 
for details including a list of Invited Speakers, a form for
registration/abstract submission, and information about


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

The patch can be downloaded from


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)


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:

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


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 

Elizabeth Galle for the CIAO team 


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Last modified: 12/03/10

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