Parameter Description Unit Comments TITLE GCNAMONNotice NOTICE DATE GCNnoticetime UT NOTICE TYPE AMONICECUBEHESE RUN NUM IceCubeHESERunID EVENT NUM IceCubeHESEEventID SRC RA RightAscensionoftheev ID: 826052
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document,weonlydiscussthetrack-likeevent
document,weonlydiscussthetrack-likeevents,asthesearetheeventsnowbeingpubliclydistributed.Theirrelatedparametersareexplainedinmoredetailbelow.2GCNAlertContentsHerewedescribetheinformationcontainedinGCNalertsfromtheHESEdatastream(containingonlytrack-likeevents)thatwillbesenttothefollow-upobservato-riesviaAMON.GCNalertscanbereceivedinemail,VOEventand/orsocket-basedformat.Herewedescribealltheparametersthatafollow-upobservatorywillreceiveviaemailinTable1.Thekeyparametersarethesameintheotherformats.Table1:GCNalertcontents.aTJD=TruncatedJulianDate,bDOY=DaysofYear,cSOD=SecondsofDayinun
itsofcenti-seconds(secondsmultipliedby10
itsofcenti-seconds(secondsmultipliedby100andthenintegerized).ParameterDescriptionUnitCommentsTITLE\GCN/AMONNotice"NOTICEDATEGCNnoticetimeUTNOTICETYPE\AMONICECUBEHESE"RUNNUMIceCubeHESERunIDEVENTNUMIceCubeHESEEventIDSRCRARightAscensionoftheeventJ2000,cur-rent,and1950SRCDECDeclinationoftheeventJ2000,cur-rent,and1950SRCERROR50Angularerroroftheeventwith50%containmentarcminradiusVariesbetween0.4and1.6forrevision-0basedontheeventproperties,seeSec-tion7SRCERRORAngularerroroftheeventwith90%containmentarcminradiusVariesbetween1.2and8.9&
#14;forrevision-0basedontheeventproperti
#14;forrevision-0basedontheeventproperties,seeSec-tion7Continuedonnextpage2Table1{ContinuedfrompreviouspageParameterDescriptionUnitCommentsSUNDISTAngulardistanceoftheeventrelativetotheSun[deg]AlsoSunanglein[hr](EastofSun)MOONPOSTN(RA,Dec)oftheMoon[deg]and([h,m,s],[d,,])MOONDISTAngulardistanceoftheeventrelativetotheMoon[deg]GALCOORDSGalacticlongitudeandlati-tudeoftheevent[deg]ECLCOORDSEclipticlongitudeandlati-tudeoftheevent[deg]COMMENTS\AMONICECUBEHESE"[deg]3PotentialRevisionsTheeventreconstructionmayberenedinnearrealtime(withinthreehoursof
anoriginalalert)withabetterangularrecons
anoriginalalert)withabetterangularreconstructionandabetterdistinctionbetweentrack-likeandshower-likeevents.Theserenedreconstructionswillimproveangularresolutionbymorethan50%(1).Whenthishappens,arevisedalertthatcontainsnewinformationwillbecreated.Therevisedalertwillkeepthesameeventnumberinformationastheoriginalalert,butitwillhaveitsrevisionnumberincreasedby1.Therevisionis0fortherstrealtimealertandwillbeincreasedby1foreachneweventrevision.Eachalertcanberevisedmultipletimes.3.1RetractionsAnyalertthatisdeterminednottobeastrophysicalinoriginwillberetractedwithinh
oursorpossiblyuptoadayfollowingtheorigin
oursorpossiblyuptoadayfollowingtheoriginalalert.4ChargeTheastrophysicalsignalismostprominentathighenergywhereneutrinointer-actionsresultinlotsoflight(andphotoelectronsor`charge')inthedetector.Weusethechargemostcausallyconnected(observedwithin5softheeventstarttime)inordertocutoutlightfromcombinedlowenergyevents.AllhitsinDeepCoreandonsingledigitalopticalmodules(DOMs)containingmorethan50%ofthetotalchargeintheeventareexcluded.Here,wedistributeHESEwithcharges6000p.e.4(a)Charge�6000p.e.(b)Charge�7000p.e.Figure1:Rate(numberofeventsperyear)vs.di erentcutso
nsignaltracknessestimatorforHESEsignala
nsignaltracknessestimatorforHESEsignalandbackgroundwithcharge(a)�6000p.e.and(b)�7000p.e.:HESEtrackeventsareshowninred,theatmosphericconventionalneutrinosingreen,andtheatmosphericmuonsinblue.Table2:Di erentcutsoneventchargesresultindi erentsignalandnoiseratesandsignaltonoiseratios.ChargeSignalRate(/yr)(Rs)BackgroundRate(/yr)(Rb)SNR=RspRs+Rb60001.083.730.4965001.002.810.5170000.911.160.6375000.840.920.63cutsonsignaltracknessforthreeeventtypes:HESEtrackeventsinred,track-likeatmosphericconventionalneutrinobackgroundingreen,andtrack-lik
eatmosphericmuonbackgroundinblue.Another
eatmosphericmuonbackgroundinblue.Anotheroptionistorequirelargerdepositedcharge.Table2showsthesignalandbackgroundrates(expectednumberofeventsperyear)fordi erentchargecutsaswellasthesignaltonoiseratio(SNR).Allnumbersinthistableareforeventswithsignaltrackness0:1.Thefollowupobservatoriescandecidewhicheventstoimagebasedontheircharge,signaltrackness,andrateinformation.Figure1(b)showstherate(numberofeventsperyear)vs.di erentcutsonsignaltracknessforsignalandbackgroundHESEwithcharge�7000p.e.Inthisgure,HESEtrackeventsareshowninred,theatmosphericconventionalneu