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[vsnet-grb-info 173] GRB 020321: Candidate X-ray Counterparts
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 1342
SUBJECT: GRB 020321: Candidate X-ray Counterparts
DATE: 02/04/08 23:44:03 GMT
FROM: Derek Fox at CIT <derekfox@astro.caltech.edu>
D.W. Fox (Caltech) reports on behalf of the Caltech-NRAO-CARA GRB
collaboration:
"We have imaged the error circle of GRB020321 (GCN 1284, 1285) with
the Chandra X-ray Observatory for 20 ksec beginning at March 31.08 UT,
9.9 days after the burst. The pointing of the spacecraft was chosen
to center the 2-arcmin radius BeppoSAX NFI localization (GCN 1285) on
the ACIS-S3 detector. Reduction of the data using standard Ciao
procedures yields the following source catalog (listed in decreasing
order of significance) for this region:
ID IAU Name Sig Cts HR
=======================================================
1 CXOU J161122.3-834121 37.4 80.4(90) 0.47(12)
2 CXOU J161105.1-834111 15.1 31.5(57) 0.43(16)
3 CXOU J161104.2-834124 7.9 15.7(40) 0.12(16)
4 CXOU J161048.0-834004 3.0 5.8(25) 0.09(28)
5 CXOU J160953.5-834159 2.9 5.7(25) 0.63(89)
6 CXOU J161205.3-834132 2.5 4.8(22) 0.04(19)
7 CXOU J161058.8-834343 2.0 3.8(20) 0.52(65)
=======================================================
where "Sig" is the wavdetect-quoted significance of the source in the
0.3 to 7.0 keV band, "Cts" is the counts in this band over the 20.0 ks
exposure, "HR" is the hardness ratio of 2.1-7.0 keV counts to 0.3-2.1
keV counts, and uncertainties in the trailing digits are indicated in
parentheses. J2000 coordinates of the sources are implicit in their
IAU names.
No sources are detected coincident with the reported ATCA radio
candidates (GCN 1308). Source 6 (CXOU J161205.3-834132) is coincident
with a weak source (not a USNO star) from the Digitized Sky Survey
(SES)."
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