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Chandra Electronic Announcement #61

CXC Web site: cxc.harvard.edu

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1. Chandra Source Catalog Release 1.1
2. Release of Data Products for Chandra Deep Field South Observations
3. Upcoming Chandra Users Committee Meeting
4. Einstein Postdoctoral Fellowship Program for 2011
5. Einstein Fellowship Symposium


Item 1. Chandra Source Catalog Release 1.1

The Chandra X-ray Center is pleased to announce that release 1.1 of
the Chandra Source Catalog (CSC) is now available for use by the
astronomical community. 

The CSC is being released to the user community in a series of
increments with increasing capability. Release 1.1 of the CSC includes
106,586 point and compact sources (with observed spatial extents less
than about 30arcsec) detected in a subset of ACIS and HRC-I imaging
observations released publicly prior to the start of 2010. (Release
1.0 contained 94676 sources.) 

Please note that at this time, the CSC Sky in Google Earth, CSC-SDSS
Cross-match Catalog, and CSC Sensitivity Map Service continue to
reference release 1.0 of the catalog. These interfaces will be updated
to use release 1.1 shortly. An announcement will be posted when these
changes are made. 

The CSC provides simple access to Chandra data for individual sources
or sets of sources matching user-specified search criteria. For each
X-ray source, the catalog includes directly measured properties for
the sources, such as positions and multi-band count rates, together
with numerous commonly used derived quantities such as source extent
estimates, multi-band aperture fluxes, hardness ratios, and temporal
variability information. In addition, the catalog includes associated
file-based data products that can be manipulated interactively by the
user, including images, photon event lists, light curves, and spectra
for each source individually from each observation in which a source
is detected. 

Data access is provided by the CSCview GUI, which may be accessed from
the catalog web site: 


Extensive user documentation, including a detailed description of the
catalog contents and their statistical properties, may also be found
on the catalog web site. 

--Frank Primini for the CSC Project Team


Item 2. Release of Data Products for Chandra Deep Field South Observations

In late 2009, the Chandra X-ray Center Director's Office and the
Chandra Project Scientist committed 2 Msec of Chandra Director's
Discretionary Time (DDT) to extend the exposure for the Chandra Deep
Field South (CDFS) from 2 Msec to 4 Msec. As further described in the
Cycle 12 Call for Proposals
(http://cxc.harvard.edu/proposer/CfP/html/CfP_chapter4.html#T14), the
time was composed of 1Msec of unused DDT from Cycles 9 and 10 and an
allocation of 500 ksec not previously committed for both Cycles 11 and
12. There is no proprietary time associated with these CDFS data, so
all interested parties are welcome to pursue scientific

We are now releasing two merged data sets of CDF-S observations.
 Dataset 1: Entire 52 CDFS observations for a total exposure of 3.8Ms
 Dataset 2: 31 observations taken in 2010 for a total exposure of 2.0Ms
These datasets are available via

As part of the merging, all observations have been registered
astrometrically. The individual (unregistered) observations will also
be available promptly through the archive via, e.g., ChaSeR or Web

Any paper that may result from the use of these data the appropriate
should include in the manuscript this Dataset Identifier for the CDFS
merged data: 


Item 3. Upcoming Chandra Users Committee Meeting

The Chandra Users Committee's purpose is to represent the broader user
community exists to the Chandra X-ray Center by providing a formal
mechanism for influencing CXC policies and operations. 

The next CUC meeting will take place at the CfA in Cambridge on Oct
25th, 2010.  We encourage Chandra users to communicate any issues of
concern relevant to the CUC in a timely fashion, so that they might be
included in the meeting agenda which should be substantially developed
by mid-September. 

The webpage for the CUC:
shows its current membership with contact information, and also
provides links for past CUC meetings, to their agenda, CXC
presentations, minutes, as well as CUC recommendations to  the CXC,
and the CXC response to those recommendations. 


Item 4. Einstein Postdoctoral Fellowship Program for 2011

The CXC announces the 2011 Einstein Postdoctoral Fellowship Program
and solicits applications for fellowships to begin in the fall of
2011. The Einstein Postdoctoral Fellowship program, sponsored by NASA,
awards Fellowships to recent Ph.D.'s (since January 1, 2008) in
astronomy, physics, and related disciplines.  The deadline for
applications is Nov 4 2010.  Please see the Einstein Fellowship Web
Page for details: 


Item 5. Einstein Fellowship Symposium

Current Einstein Fellows will present their work at the Einstein
Fellows Symposium on October 19-20, 2010 at the Harvard-Smithsonian
Center for Astrophysics.  All are welcome to attend. 

Last modified: 12/03/10

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