|  | <?xml version="1.0" ?> | 
        
          |  | <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="test" ivorn="ivo://gwnet/LVC#MS181101ab-1-Preliminary"> | 
        
          |  | <Who> | 
        
          |  | <Date>2018-11-01T22:34:49</Date> | 
        
          |  | <Author> | 
        
          |  | <contactName>LIGO Scientific Collaboration and Virgo Collaboration</contactName> | 
        
          |  | </Author> | 
        
          |  | </Who> | 
        
          |  | <What> | 
        
          |  | <Param name="internal" dataType="int" value="0"> | 
        
          |  | <Description>Indicates whether this event should be distributed to LSC/Virgo members only</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="Packet_Type" dataType="int" value="150"> | 
        
          |  | <Description>The Notice Type number is assigned/used within GCN, eg type=150 is an LVC_PRELIMINARY notice</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="Pkt_Ser_Num" dataType="string" value="1"> | 
        
          |  | <Description>A number that increments by 1 each time a new revision is issued for this event</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="GraceID" dataType="string" value="MS181101ab" ucd="meta.id"> | 
        
          |  | <Description>Identifier in GraceDB</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="AlertType" dataType="string" value="Preliminary" ucd="meta.version"> | 
        
          |  | <Description>VOEvent alert type</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="HardwareInj" dataType="int" value="0" ucd="meta.number"> | 
        
          |  | <Description>Indicates that this event is a hardware injection if 1, no if 0</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="OpenAlert" dataType="int" value="1" ucd="meta.number"> | 
        
          |  | <Description>Indicates that this event is an open alert if 1, no if 0</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="EventPage" dataType="string" value="https://example.org/superevents/MS181101ab/view/" ucd="meta.ref.url"> | 
        
          |  | <Description>Web page for evolving status of this GW candidate</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="Instruments" dataType="string" value="H1,L1" ucd="meta.code"> | 
        
          |  | <Description>List of instruments used in analysis to identify this event</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="FAR" dataType="float" value="9.11069936486e-14" ucd="arith.rate;stat.falsealarm" unit="Hz"> | 
        
          |  | <Description>False alarm rate for GW candidates with this strength or greater</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="Group" dataType="string" value="CBC" ucd="meta.code"> | 
        
          |  | <Description>Data analysis working group</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="Pipeline" dataType="string" value="gstlal" ucd="meta.code"> | 
        
          |  | <Description>Low-latency data analysis pipeline</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="Search" dataType="string" value="MDC" ucd="meta.code"> | 
        
          |  | <Description>Specific low-latency search</Description> | 
        
          |  | </Param> | 
        
          |  | <Group type="GW_SKYMAP" name="bayestar"> | 
        
          |  | <Param name="skymap_fits" dataType="string" value="https://emfollow.docs.ligo.org/userguide/_static/bayestar.fits.gz" ucd="meta.ref.url"> | 
        
          |  | <Description>Sky Map FITS</Description> | 
        
          |  | </Param> | 
        
          |  | </Group> | 
        
          |  | <Group type="Classification"> | 
        
          |  | <Description>Source classification: binary neutron star (BNS), neutron star-black hole (NSBH), binary black hole (BBH), MassGap, or terrestrial (noise)</Description> | 
        
          |  | <Param name="BNS" dataType="float" value="0.95" ucd="stat.probability"> | 
        
          |  | <Description>Probability that the source is a binary neutron star merger (both objects lighter than 3 solar masses)</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="NSBH" dataType="float" value="0.01" ucd="stat.probability"> | 
        
          |  | <Description>Probability that the source is a neutron star-black hole merger (primary heavier than 5 solar masses, secondary lighter than 3 solar masses)</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="BBH" dataType="float" value="0.03" ucd="stat.probability"> | 
        
          |  | <Description>Probability that the source is a binary black hole merger (both objects heavier than 5 solar masses)</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="MassGap" dataType="float" value="0.0" ucd="stat.probability"> | 
        
          |  | <Description>Probability that the source has at least one object between 3 and 5 solar masses</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="Terrestrial" dataType="float" value="0.01" ucd="stat.probability"> | 
        
          |  | <Description>Probability that the source is terrestrial (i.e., a background noise fluctuation or a glitch)</Description> | 
        
          |  | </Param> | 
        
          |  | </Group> | 
        
          |  | <Group type="Properties"> | 
        
          |  | <Description>Qualitative properties of the source, conditioned on the assumption that the signal is an astrophysical compact binary merger</Description> | 
        
          |  | <Param name="HasNS" dataType="float" value="0.95" ucd="stat.probability"> | 
        
          |  | <Description>Probability that at least one object in the binary has a mass that is less than 2.83 solar masses</Description> | 
        
          |  | </Param> | 
        
          |  | <Param name="HasRemnant" dataType="float" value="0.91" ucd="stat.probability"> | 
        
          |  | <Description>Probability that a nonzero mass was ejected outside the central remnant object</Description> | 
        
          |  | </Param> | 
        
          |  | </Group> | 
        
          |  | </What> | 
        
          |  | <WhereWhen> | 
        
          |  | <ObsDataLocation> | 
        
          |  | <ObservatoryLocation id="LIGO Virgo"/> | 
        
          |  | <ObservationLocation> | 
        
          |  | <AstroCoordSystem id="UTC-FK5-GEO"/> | 
        
          |  | <AstroCoords coord_system_id="UTC-FK5-GEO"> | 
        
          |  | <Time> | 
        
          |  | <TimeInstant> | 
        
          |  | <ISOTime>2018-11-01T22:22:46.654437</ISOTime> | 
        
          |  | </TimeInstant> | 
        
          |  | </Time> | 
        
          |  | </AstroCoords> | 
        
          |  | </ObservationLocation> | 
        
          |  | </ObsDataLocation> | 
        
          |  | </WhereWhen> | 
        
          |  | <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> | 
        
          |  | <Description>Report of a candidate gravitational wave event</Description> | 
        
          |  | </voe:VOEvent> |