J/MNRAS/403/945 Swift/XRT obs. of unidentified IBIS sources (Landi+, 2010)
Swift/XRT observations of unidentified INTEGRAL/IBIS sources.
Landi R., Bassani L., Malizia A., Stephen J.B., Bazzano A., Fiocchi M.,
Bird A.J.
<Mon. Not. R. Astron. Soc., 403, 945-959 (2010)>
=2010MNRAS.403..945L 2010MNRAS.403..945L
ADC_Keywords: X-ray sources ; Gamma rays
Keywords: catalogues - surveys - gamma-rays: observations
Abstract:
The most recent IBIS/ISGRI survey, i.e. the fourth one, lists 723 hard
X-ray sources, many still unidentified, i.e. lacking an X-ray
counterpart or simply not studied at lower energies, i.e. below 10keV.
In order to overcome this lack of X-ray information, we
cross-correlated the list of IBIS sources included in the fourth IBIS
catalogue with the Swift/X-ray Telescope (XRT) data archive, finding a
sample of 20 objects, not yet reported in the literature, for which
XRT data could help in the search for the X-ray and hence optical
counterpart and/or, for the first time, in the study of the source
spectral and variability properties below 10keV. 16 of these objects
are new INTEGRAL detections, while four were already listed in the
third survey but not yet observed in X-rays.
Description:
For all sources in the sample, we use X-ray data acquired with the XRT
(0.3-10keV) on board the Swift satellite.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 50 Log of the Swift/XRT observations used in this paper
table2.dat 179 53 INTEGRAL/IBIS position of the 20 selected sources
and locations of the objects detected by XRT,
within the 90% and 99% IBIS error circles,
with relative counterparts
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- Source IBIS source
23- 33 I11 --- ID Observation ID
35- 44 A10 "YYYY/MM/DD" Date Observation date
46- 50 I5 s Exp Time exposure
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- Source IBIS source
22 A1 --- n_Source [b] source is located at high Galactic
latitude (|b|>10)
24- 25 I2 h RAh Source right ascension (J2000)
27- 28 I2 min RAm Source right ascension (J2000)
30- 34 F5.2 s RAs Source right ascension (J2000)
36 A1 --- DE- Source declination sign (J2000)
37- 38 I2 deg DEd Source declination (J2000)
40- 41 I2 arcmin DEm Source declination (J2000)
43- 46 F4.1 arcsec DEs Source declination (J2000)
48- 50 F3.1 arcsec eRad Error radius, given at 90% confidence level
52- 53 I2 --- Seq ? Sequential number of XRT detected object,
within the source
55- 62 A8 --- eCir ? Error circle definition (90% or 99%)
64- 65 I2 h RA1h ? XRT right ascension (J2000)
67- 68 I2 min RA1m ? XRT right ascension (J2000)
70- 74 F5.2 s RA1s ? XRT right ascension (J2000)
76 A1 --- DE1- XRT declination sign (J2000)
77- 78 I2 deg DE1d ? XRT declination (J2000)
80- 81 I2 arcmin DE1m ? XRT declination (J2000)
83- 86 F4.1 arcsec DE1s ? XRT declination (J2000)
88- 91 F4.2 arcsec ePos ? Error on XRT position
93- 98 F6.2 ct/ks CR ? Count rate in 0.3-10keV band
100-104 F5.2 ct/ks e_CR ? rms uncertainty on CR
106-179 A74 --- Ctp Counterpart name(s), from NED, HEASARC and
SIMBAD (1)
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Note (1): c: The better localisation obtained by Chandra indicates this
source as the likely counterpart of the IBIS detection (see text)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Feb-2012