INTEGRAL detection of a hard X-ray transient in NGC 6440

E. Kuulkers; E. Bozzo; A. Bazzano; V. Beckmann; T. Bird; A. Bodaghee; J. Chenevez; M. Del Santo; A. Domingo; P. Jonker; P. Kretschmar; A. Paizis; K. Pottschmidt; C. Markwardt; C. Sanchez-Fernandez; R. Wijnands

INTEGRAL detection of a hard X-ray transient in NGC 6440

E. Kuulkers^*, E. Bozzo, A. Bazzano, V. Beckmann, T. Bird, A. Bodaghee, J. Chenevez, M. Del Santo, A. Domingo, P. Jonker, P. Kretschmar, A. Paizis, K. Pottschmidt, C. Markwardt, C. Sanchez-Fernandez, R. Wijnands

^*Corresponding author for this work

Research output: Other contribution › Net publication - Internet publication › Research

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Abstract

Referred to by ATel #: 7106, 7136, 7183
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During INTEGRAL Galactic bulge monitoring (e.g., ATel #438) observations performed on UT 2015 February 17 at 12.53-16:45, IBIS/ISGRI detected renewed activity at hard X-rays from a transient within the Globular Cluster NGC 6440. The best determined position is: RA, Dec (J2000) = 267.208, -20.314 degrees, with an error radius of 2.4 arcmin (90% c.l.). Formally, there is no known X-ray source within the error circle, so we label the source as IGR J17488-2018. The hard X-ray transient is detected at a significance of 11 (6.5) sigma on the IBIS/ISGRI mosaic in the 20-40 keV (40-80 keV) energy band. The IBIS/ISGRI spectrum (total exposure time of 12 ks) provides a photon index of 2.4 +/- 0.5 and a 20-100 keV flux of 4.8E-10 ergs/cm^2/s. NGC 6440 was outside the JEM-X field-of-view for the entire observation. The Globular Cluster NGC 6440 is known to host millisecond X-ray pulsars (see, e.g., ATel #2672), so it is possible that INTEGRAL detected an outburst from one of these sources. We can not rule out that one of the known X-ray sources just outside the error circle (such as MXB 1746-20 aka H1745-203) is experiencing an outburst. Note that Swift/BAT also detects enhanced activity from H1745-203 over the last days. Further INTEGRAL observations in the direction of NGC 6440 are planned for the coming weeks. Swift ToO follow-up observations have been requested. Observations at other wavelengths are encouraged.

Original language	English
Publication date	18 Feb 2015
Publication status	Published - 18 Feb 2015

Series	The Astronomer's telegram
Number	ATel #7098

Keywords

Binary
Globular Cluster
Neutron Star
Transient
Variables
Pulsar

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Kuulkers, E., Bozzo, E., Bazzano, A., Beckmann, V., Bird, T., Bodaghee, A., Chenevez, J., Del Santo, M., Domingo, A., Jonker, P., Kretschmar, P., Paizis, A., Pottschmidt, K., Markwardt, C., Sanchez-Fernandez, C., & Wijnands, R. (2015, Feb 18). INTEGRAL detection of a hard X-ray transient in NGC 6440. The Astronomer's telegram No. ATel #7098 http://www.astronomerstelegram.org/?read=7098

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title = "INTEGRAL detection of a hard X-ray transient in NGC 6440",

abstract = "Referred to by ATel #: 7106, 7136, 7183 Tweet During INTEGRAL Galactic bulge monitoring (e.g., ATel #438) observations performed on UT 2015 February 17 at 12.53-16:45, IBIS/ISGRI detected renewed activity at hard X-rays from a transient within the Globular Cluster NGC 6440. The best determined position is: RA, Dec (J2000) = 267.208, -20.314 degrees, with an error radius of 2.4 arcmin (90% c.l.). Formally, there is no known X-ray source within the error circle, so we label the source as IGR J17488-2018. The hard X-ray transient is detected at a significance of 11 (6.5) sigma on the IBIS/ISGRI mosaic in the 20-40 keV (40-80 keV) energy band. The IBIS/ISGRI spectrum (total exposure time of 12 ks) provides a photon index of 2.4 +/- 0.5 and a 20-100 keV flux of 4.8E-10 ergs/cm^2/s. NGC 6440 was outside the JEM-X field-of-view for the entire observation. The Globular Cluster NGC 6440 is known to host millisecond X-ray pulsars (see, e.g., ATel #2672), so it is possible that INTEGRAL detected an outburst from one of these sources. We can not rule out that one of the known X-ray sources just outside the error circle (such as MXB 1746-20 aka H1745-203) is experiencing an outburst. Note that Swift/BAT also detects enhanced activity from H1745-203 over the last days. Further INTEGRAL observations in the direction of NGC 6440 are planned for the coming weeks. Swift ToO follow-up observations have been requested. Observations at other wavelengths are encouraged.",

keywords = "Binary, Globular Cluster, Neutron Star, Transient, Variables, Pulsar",

author = "E. Kuulkers and E. Bozzo and A. Bazzano and V. Beckmann and T. Bird and A. Bodaghee and J. Chenevez and {Del Santo}, M. and A. Domingo and P. Jonker and P. Kretschmar and A. Paizis and K. Pottschmidt and C. Markwardt and C. Sanchez-Fernandez and R. Wijnands",

year = "2015",

month = feb,

day = "18",

language = "English",

series = "The Astronomer's telegram",

publisher = "R. Rutledge",

number = "ATel #7098",

type = "Other",

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TY - ICOMM

T1 - INTEGRAL detection of a hard X-ray transient in NGC 6440

AU - Kuulkers, E.

AU - Bozzo, E.

AU - Bazzano, A.

AU - Beckmann, V.

AU - Bird, T.

AU - Bodaghee, A.

AU - Chenevez, J.

AU - Del Santo, M.

AU - Domingo, A.

AU - Jonker, P.

AU - Kretschmar, P.

AU - Paizis, A.

AU - Pottschmidt, K.

AU - Markwardt, C.

AU - Sanchez-Fernandez, C.

AU - Wijnands, R.

PY - 2015/2/18

Y1 - 2015/2/18

N2 - Referred to by ATel #: 7106, 7136, 7183 Tweet During INTEGRAL Galactic bulge monitoring (e.g., ATel #438) observations performed on UT 2015 February 17 at 12.53-16:45, IBIS/ISGRI detected renewed activity at hard X-rays from a transient within the Globular Cluster NGC 6440. The best determined position is: RA, Dec (J2000) = 267.208, -20.314 degrees, with an error radius of 2.4 arcmin (90% c.l.). Formally, there is no known X-ray source within the error circle, so we label the source as IGR J17488-2018. The hard X-ray transient is detected at a significance of 11 (6.5) sigma on the IBIS/ISGRI mosaic in the 20-40 keV (40-80 keV) energy band. The IBIS/ISGRI spectrum (total exposure time of 12 ks) provides a photon index of 2.4 +/- 0.5 and a 20-100 keV flux of 4.8E-10 ergs/cm^2/s. NGC 6440 was outside the JEM-X field-of-view for the entire observation. The Globular Cluster NGC 6440 is known to host millisecond X-ray pulsars (see, e.g., ATel #2672), so it is possible that INTEGRAL detected an outburst from one of these sources. We can not rule out that one of the known X-ray sources just outside the error circle (such as MXB 1746-20 aka H1745-203) is experiencing an outburst. Note that Swift/BAT also detects enhanced activity from H1745-203 over the last days. Further INTEGRAL observations in the direction of NGC 6440 are planned for the coming weeks. Swift ToO follow-up observations have been requested. Observations at other wavelengths are encouraged.

AB - Referred to by ATel #: 7106, 7136, 7183 Tweet During INTEGRAL Galactic bulge monitoring (e.g., ATel #438) observations performed on UT 2015 February 17 at 12.53-16:45, IBIS/ISGRI detected renewed activity at hard X-rays from a transient within the Globular Cluster NGC 6440. The best determined position is: RA, Dec (J2000) = 267.208, -20.314 degrees, with an error radius of 2.4 arcmin (90% c.l.). Formally, there is no known X-ray source within the error circle, so we label the source as IGR J17488-2018. The hard X-ray transient is detected at a significance of 11 (6.5) sigma on the IBIS/ISGRI mosaic in the 20-40 keV (40-80 keV) energy band. The IBIS/ISGRI spectrum (total exposure time of 12 ks) provides a photon index of 2.4 +/- 0.5 and a 20-100 keV flux of 4.8E-10 ergs/cm^2/s. NGC 6440 was outside the JEM-X field-of-view for the entire observation. The Globular Cluster NGC 6440 is known to host millisecond X-ray pulsars (see, e.g., ATel #2672), so it is possible that INTEGRAL detected an outburst from one of these sources. We can not rule out that one of the known X-ray sources just outside the error circle (such as MXB 1746-20 aka H1745-203) is experiencing an outburst. Note that Swift/BAT also detects enhanced activity from H1745-203 over the last days. Further INTEGRAL observations in the direction of NGC 6440 are planned for the coming weeks. Swift ToO follow-up observations have been requested. Observations at other wavelengths are encouraged.

KW - Binary

KW - Globular Cluster

KW - Neutron Star

KW - Transient

KW - Variables

KW - Pulsar

M3 - Net publication - Internet publication

T3 - The Astronomer's telegram

ER -

INTEGRAL detection of a hard X-ray transient in NGC 6440

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Keywords

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