<?xml version='1.0' encoding='UTF-8'?> <voe:VOEvent xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:voe="http://www.ivoa.net/xml/VOEvent/v2.0" xsi:schemaLocation="http://www.ivoa.net/xml/VOEvent/v2.0 http://www.ivoa.net/xml/VOEvent/VOEvent-v2.0.xsd" version="2.0" role="observation" ivorn="ivo://gwnet/LVC#S230912m-1-Preliminary"> <Who> <Date>2023-09-12T05:03:57Z</Date> <Author> <contactName>LIGO Scientific Collaboration, Virgo Collaboration, and KAGRA Collaboration</contactName> </Author> </Who> <What> <Param name="Packet_Type" value="150" dataType="int"> <Description>The Notice Type number is assigned/used within GCN, eg type=150 is an LVC_PRELIMINARY notice</Description> </Param> <Param name="internal" value="0" dataType="int"> <Description>Indicates whether this event should be distributed to LSC/Virgo/KAGRA members only</Description> </Param> <Param name="Pkt_Ser_Num" value="1" dataType="int"> <Description>A number that increments by 1 each time a new revision is issued for this event</Description> </Param> <Param name="GraceID" value="S230912m" ucd="meta.id" dataType="string"> <Description>Identifier in GraceDB</Description> </Param> <Param name="AlertType" value="Preliminary" ucd="meta.version" dataType="string"> <Description>VOEvent alert type</Description> </Param> <Param name="HardwareInj" value="0" ucd="meta.number" dataType="int"> <Description>Indicates that this event is a hardware injection if 1, no if 0</Description> </Param> <Param name="OpenAlert" value="1" ucd="meta.number" dataType="int"> <Description>Indicates that this event is an open alert if 1, no if 0</Description> </Param> <Param name="EventPage" value="https://gracedb.ligo.org/superevents/S230912m/view/" ucd="meta.ref.url" dataType="string"> <Description>Web page for evolving status of this GW candidate</Description> </Param> <Param name="Instruments" value="H1,L1" ucd="meta.code" dataType="string"> <Description>List of instruments used in analysis to identify this event</Description> </Param> <Param name="FAR" value="5.102287e-06" unit="Hz" ucd="arith.rate;stat.falsealarm" dataType="float"> <Description>False alarm rate for GW candidates with this strength or greater</Description> </Param> <Param name="Significant" value="0" ucd="meta.number" dataType="int"> <Description>Indicates that this event is significant if 1, no if 0</Description> </Param> <Param name="Group" value="CBC" ucd="meta.code" dataType="string"> <Description>Data analysis working group</Description> </Param> <Param name="Pipeline" value="MBTA" ucd="meta.code" dataType="string"> <Description>Low-latency data analysis pipeline</Description> </Param> <Param name="Search" value="AllSky" ucd="meta.code" dataType="string"> <Description>Specific low-latency search</Description> </Param> <Group name="GW_SKYMAP" type="GW_SKYMAP"> <Param name="skymap_fits" value="https://gracedb.ligo.org/api/superevents/S230912m/files/bayestar.multiorder.fits,0" ucd="meta.ref.url" dataType="string"> <Description>Sky Map FITS</Description> </Param> </Group> <Group name="Classification" type="Classification"> <Param name="BNS" value="0.00226306" ucd="stat.probability" dataType="float"> <Description>Probability that the source is a binary neutron star merger (both objects lighter than 3 solar masses)</Description> </Param> <Param name="NSBH" value="0.001101461" ucd="stat.probability" dataType="float"> <Description>Probability that the source is a neutron star-black merger (secondary lighter than 3 solar masses)</Description> </Param> <Param name="BBH" value="0.0" ucd="stat.probability" dataType="float"> <Description>Probability that the source is a binary black hole merger (both objects heavier than 3 solar masses)</Description> </Param> <Param name="Terrestrial" value="0.996635479" ucd="stat.probability" dataType="float"> <Description>Probability that the source is terrestrial (i.e., a background noise fluctuation or a glitch)</Description> </Param> <Description>Source classification: binary neutron star (BNS), neutron star-black hole (NSBH), binary black hole (BBH), or terrestrial (noise)</Description> </Group> <Group name="Properties" type="Properties"> <Param name="HasNS" value="1.0" ucd="stat.probability" dataType="float"> <Description>Probability that at least one object in the binary has a mass that is less than 3 solar masses</Description> </Param> <Param name="HasRemnant" value="0.8877069067802349" ucd="stat.probability" dataType="float"> <Description>Probability that a nonzero mass was ejected outside the central remnant object</Description> </Param> <Param name="HasMassGap" value="0.5286784725786393" ucd="stat.probability" dataType="float"> <Description>Probability that the source has at least one object between 3 and 5 solar masses</Description> </Param> <Description>Qualitative properties of the source, conditioned on the assumption that the signal is an astrophysical compact binary merger</Description> </Group> </What> <WhereWhen> <ObsDataLocation> <ObservatoryLocation id="LIGO Virgo"/> <ObservationLocation> <AstroCoordSystem id="UTC-FK5-GEO"/> <AstroCoords coord_system_id="UTC-FK5-GEO"> <Time unit="s"> <TimeInstant> <ISOTime>2023-09-12T05:03:25Z</ISOTime> </TimeInstant> </Time> </AstroCoords> </ObservationLocation> </ObsDataLocation> </WhereWhen> <Description>Report of a candidate gravitational wave event</Description> <How> <Description>Candidate gravitational wave event identified by low-latency analysis</Description> <Description>H1: LIGO Hanford 4 km gravitational wave detector</Description> <Description>L1: LIGO Livingston 4 km gravitational wave detector</Description> </How> </voe:VOEvent> <?xml version='1.0' encoding='UTF-8'?> <voe:VOEvent xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:voe="http://www.ivoa.net/xml/VOEvent/v2.0" xsi:schemaLocation="http://www.ivoa.net/xml/VOEvent/v2.0 http://www.ivoa.net/xml/VOEvent/VOEvent-v2.0.xsd" version="2.0" role="observation" ivorn="ivo://gwnet/LVC#S230912m-2-Preliminary"> <Who> <Date>2023-09-12T05:08:32Z</Date> <Author> <contactName>LIGO Scientific Collaboration, Virgo Collaboration, and KAGRA Collaboration</contactName> </Author> </Who> <What> <Param name="Packet_Type" value="150" dataType="int"> <Description>The Notice Type number is assigned/used within GCN, eg type=150 is an LVC_PRELIMINARY notice</Description> </Param> <Param name="internal" value="0" dataType="int"> <Description>Indicates whether this event should be distributed to LSC/Virgo/KAGRA members only</Description> </Param> <Param name="Pkt_Ser_Num" value="2" dataType="int"> <Description>A number that increments by 1 each time a new revision is issued for this event</Description> </Param> <Param name="GraceID" value="S230912m" ucd="meta.id" dataType="string"> <Description>Identifier in GraceDB</Description> </Param> <Param name="AlertType" value="Preliminary" ucd="meta.version" dataType="string"> <Description>VOEvent alert type</Description> </Param> <Param name="HardwareInj" value="0" ucd="meta.number" dataType="int"> <Description>Indicates that this event is a hardware injection if 1, no if 0</Description> </Param> <Param name="OpenAlert" value="1" ucd="meta.number" dataType="int"> <Description>Indicates that this event is an open alert if 1, no if 0</Description> </Param> <Param name="EventPage" value="https://gracedb.ligo.org/superevents/S230912m/view/" ucd="meta.ref.url" dataType="string"> <Description>Web page for evolving status of this GW candidate</Description> </Param> <Param name="Instruments" value="H1,L1" ucd="meta.code" dataType="string"> <Description>List of instruments used in analysis to identify this event</Description> </Param> <Param name="FAR" value="5.102287e-06" unit="Hz" ucd="arith.rate;stat.falsealarm" dataType="float"> <Description>False alarm rate for GW candidates with this strength or greater</Description> </Param> <Param name="Significant" value="0" ucd="meta.number" dataType="int"> <Description>Indicates that this event is significant if 1, no if 0</Description> </Param> <Param name="Group" value="CBC" ucd="meta.code" dataType="string"> <Description>Data analysis working group</Description> </Param> <Param name="Pipeline" value="MBTA" ucd="meta.code" dataType="string"> <Description>Low-latency data analysis pipeline</Description> </Param> <Param name="Search" value="AllSky" ucd="meta.code" dataType="string"> <Description>Specific low-latency search</Description> </Param> <Group name="GW_SKYMAP" type="GW_SKYMAP"> <Param name="skymap_fits" value="https://gracedb.ligo.org/api/superevents/S230912m/files/bayestar.multiorder.fits,1" ucd="meta.ref.url" dataType="string"> <Description>Sky Map FITS</Description> </Param> </Group> <Group name="Classification" type="Classification"> <Param name="BNS" value="0.00226306" ucd="stat.probability" dataType="float"> <Description>Probability that the source is a binary neutron star merger (both objects lighter than 3 solar masses)</Description> </Param> <Param name="NSBH" value="0.001101461" ucd="stat.probability" dataType="float"> <Description>Probability that the source is a neutron star-black merger (secondary lighter than 3 solar masses)</Description> </Param> <Param name="BBH" value="0.0" ucd="stat.probability" dataType="float"> <Description>Probability that the source is a binary black hole merger (both objects heavier than 3 solar masses)</Description> </Param> <Param name="Terrestrial" value="0.996635479" ucd="stat.probability" dataType="float"> <Description>Probability that the source is terrestrial (i.e., a background noise fluctuation or a glitch)</Description> </Param> <Description>Source classification: binary neutron star (BNS), neutron star-black hole (NSBH), binary black hole (BBH), or terrestrial (noise)</Description> </Group> <Group name="Properties" type="Properties"> <Param name="HasNS" value="1.0" ucd="stat.probability" dataType="float"> <Description>Probability that at least one object in the binary has a mass that is less than 3 solar masses</Description> </Param> <Param name="HasRemnant" value="0.8877069067802349" ucd="stat.probability" dataType="float"> <Description>Probability that a nonzero mass was ejected outside the central remnant object</Description> </Param> <Param name="HasMassGap" value="0.5286784725786393" ucd="stat.probability" dataType="float"> <Description>Probability that the source has at least one object between 3 and 5 solar masses</Description> </Param> <Description>Qualitative properties of the source, conditioned on the assumption that the signal is an astrophysical compact binary merger</Description> </Group> </What> <WhereWhen> <ObsDataLocation> <ObservatoryLocation id="LIGO Virgo"/> <ObservationLocation> <AstroCoordSystem id="UTC-FK5-GEO"/> <AstroCoords coord_system_id="UTC-FK5-GEO"> <Time unit="s"> <TimeInstant> <ISOTime>2023-09-12T05:03:25Z</ISOTime> </TimeInstant> </Time> </AstroCoords> </ObservationLocation> </ObsDataLocation> </WhereWhen> <Description>Report of a candidate gravitational wave event</Description> <How> <Description>Candidate gravitational wave event identified by low-latency analysis</Description> <Description>H1: LIGO Hanford 4 km gravitational wave detector</Description> <Description>L1: LIGO Livingston 4 km gravitational wave detector</Description> </How> <Citations> <EventIVORN cite="supersedes">ivo://gwnet/LVC#S230912m-1-Preliminary</EventIVORN> <Description>Initial localization is now available (preliminary)</Description> </Citations> </voe:VOEvent>