<?xml version='1.0'?><?xml-stylesheet href='/static/xsl/oai.xsl' type='text/xsl'?><ri:Resource created="2025-06-04T14:00:00Z" status="active" updated="2025-08-13T13:30:29Z" version="1.2" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vg="http://www.ivoa.net/xml/VORegistry/v1.0" xmlns:voe="http://www.ivoa.net/xml/VOEventRegExt/v2" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/RegistryInterface/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/RegistryInterface.xsd http://www.ivoa.net/xml/VORegistry/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VORegistry.xsd http://www.ivoa.net/xml/VOEventRegExt/v2 http://vo.ari.uni-heidelberg.de/docs/schemata/VOEventRegExt.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:DataService"><title>GCN VOEvent Streams From Swift-XRT</title><shortName>Swift XRT VOEv</shortName><identifier>ivo://org.gavo.dc/std/gcn-swift-xrt/swift</identifier><curation><publisher>GCN</publisher><creator><name>The Swift Team</name></creator><date role="updated">2035-01-01T00:00:00</date><contact><name>The Swift Team</name><email>support@gcn.nasa.gov</email></contact></curation><content><subject>gamma-ray-astronomy</subject><subject>gamma-ray-bursts</subject><subject>time-domain-astronomy</subject><description> VOEvent alerts produced from transient detections resulting from
observations with the NASA Neil Gehrels Swift Observatory and the
X-ray Telescope. Events should be reported within tens to of seconds
to hours; expect about 3 events per week, where most events correspond
to either gamma ray burst, or other transient.

There are Streams giving localizations for gamma ray transients with
follow-up characterization in X-ray including several localization
techniques, temporal and spectral data products including
ground-processed data. The notice types include onboard centroid
position (SWIFT_XRT_CENTROID) derived from an initial image
(SWIFT_XRT_IMAGE, SWIFT_XRT_IMAGE_PROC), threshhold pixels
(SWIFT_XRT_THRESHPIX, SWIFT_XRT_THRESHPIX_PROC), single pixel event
report (SWIFT_XRT_SPER, SWIFT_XRT_SPER_PROC), updated localizations
(SWIFT_XRT_POSITION), the lightcurve (SWIFT_XRT_LC), and the spectrum
(SWIFT_XRT_SPECTRUM,SWIFT_XRT_SPECTRUM_PROC).</description><source format="bibcode">2004ApJ...611.1005G</source><referenceURL>http://dc.g-vo.org/std/gcn-swift-xrt/swift/info</referenceURL><contentLevel>Research</contentLevel></content><rights>public</rights><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_CENTROID</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_IMAGE</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_IMAGE_PROC</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_LC</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_POSITION</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_SPECTRUM</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_SPECTRUM_PROC</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_SPER</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_SPER_PROC</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_THRESHPIX</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/voevent"><interface role="std" standardID="ivo://ivoa.net/std/voevent#acc-kafka" xsi:type="voe:StreamEndpoint"><accessURL use="full">x-kafka://kafka.gcn.nasa.gov?topic=gcn.classic.voevent.SWIFT_XRT_THRESHPIX_PROC</accessURL></interface></capability><capability><description>A browser-based archive of the events recorded.</description><interface xsi:type="vr:WebBrowser"><accessURL use="full">https://gcn.gsfc.nasa.gov/swift_grbs.html</accessURL></interface></capability><capability standardID="ivo://ivoa.net/std/VOSI#capabilities"><interface role="std" xsi:type="vs:ParamHTTP"><accessURL use="full">http://dc.g-vo.org/std/gcn-swift-xrt/swift/capabilities</accessURL><mirrorURL>https://dc.g-vo.org/std/gcn-swift-xrt/swift/capabilities</mirrorURL></interface></capability><facility>Neil Gehrels Swift Observatory</facility><instrument>Swift X-ray Telescope XRT</instrument><coverage><spatial>0/0-11</spatial><temporal>53329 64328</temporal><spectral>4.806529862e-17 1.602176621e-15</spectral><footprint ivo-id="ivo://ivoa.net/std/moc">http://dc.g-vo.org/std/gcn-swift-xrt/swift/coverage</footprint><waveband>X-ray</waveband></coverage></ri:Resource>