0000000001223365

AUTHOR

S. Tiwari

showing 4 related works from this author

Calibration of advanced Virgo and reconstruction of the gravitational wave signal h(t) during the observing run O2

2018

In August 2017, Advanced Virgo joined Advanced LIGO for the end of the O2 run, leading to the first gravitational waves detections with the three-detector network. This paper describes the Advanced Virgo calibration and the gravitational wave strain h(t) reconstruction during O2. The methods are the same as the ones developed for the initial Virgo detector and have already been described in previous publications, this paper summarizes the differences and emphasis is put on estimating systematic uncertainties. Three versions of the h(t) signal have been computed for the Virgo O2 run, an online version and two post-run reprocessed versions with improved detector calibration and reconstruction…

O2 observation runPhysics and Astronomy (miscellaneous)AstronomyAstrophysicsdetector: networkVIRGO: calibration01 natural sciencesGeneral Relativity and Quantum CosmologyPhysics Particles & FieldsHigh Energy Physics::Theorydetector: calibrationLIGOmirrorgravitational wavePhysicsQuantum Science & TechnologyPhysicsDetectorphotonAstrophysics::Instrumentation and Methods for AstrophysicsReconstruction algorithmMassless particleAmplitudeCalibration Advanced Virgo O2Physical SciencesCalibration[PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]Advanced VirgoAstrophysics - Instrumentation and Methods for Astrophysicson-linereconstructioninterferometergravitational wave calibration reconstruction photon calibrator Virgo O2 observation runPhysics MultidisciplinaryFOS: Physical sciencesO2General Relativity and Quantum Cosmology (gr-qc)Astronomy & Astrophysicsgravitational radiation: direct detectionParticle detectorGeneral Relativity and Quantum Cosmology0103 physical sciencesCalibrationcalibration; gravitational wave; O2 observation run; photon calibrator; reconstruction; Virgo; Physics and Astronomy (miscellaneous)[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]010306 general physicsInstrumentation and Methods for Astrophysics (astro-ph.IM)Science & Technology010308 nuclear & particles physicsGravitational waveVirgogravitational radiationcalibration; gravitational wave; O2 observation run; photon calibrator; reconstruction; Virgocalibrationphoton calibratorLIGOgravitational radiation detectordetector: sensitivity* Automatic Keywords *network
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SARS-CoV-2 vaccination modelling for safe surgery to save lives: data from an international prospective cohort study

2021

Abstract Background Preoperative SARS-CoV-2 vaccination could support safer elective surgery. Vaccine numbers are limited so this study aimed to inform their prioritization by modelling. Methods The primary outcome was the number needed to vaccinate (NNV) to prevent one COVID-19-related death in 1 year. NNVs were based on postoperative SARS-CoV-2 rates and mortality in an international cohort study (surgical patients), and community SARS-CoV-2 incidence and case fatality data (general population). NNV estimates were stratified by age (18–49, 50–69, 70 or more years) and type of surgery. Best- and worst-case scenarios were used to describe uncertainty. Results NNVs were more favourable in su…

MaleCOVID-19 Vaccinesafe surgery; vaccination modelling; COVID-19Vascular damage Radboud Institute for Health Sciences [Radboudumc 16]MULTICENTERComorbidity030230 surgery0302 clinical medicinephase 3 clinical trial (topic)Case fatality rateProspective StudiesSARS-CoV-2 Vaccination Safe surgeryCOVID-19/epidemiologySARS-CoV-2 ; vaccination ; safe surgeryeducation.field_of_studycase fatality rateVaccinationVaccinationAdolescent; Adult; Aged; COVID-19; COVID-19 Vaccines; Comorbidity; Elective Surgical Procedures; Female; Humans; Male; Middle Aged; Postoperative Complications; Preoperative Period; Prospective Studies; SARS-CoV-2; Vaccination; Young Adulthealth care policyElective Surgical Procedures030220 oncology & carcinogenesisvaccination modellingPreoperative PeriodCOVID-19; SARS-CoV-2; cancer; vaccination; outcome; mortality; infection; modellingCohort studyprospective studyHumanmedicine.medical_specialtyArticle03 medical and health sciencesSARS-CoV-2 vaccinationSDG 3 - Good Health and Well-beingCOVID-19 Vaccines/pharmacologyHumansVaccination/methodsElective surgeryeducationAgedScience & TechnologyElective Surgical Procedureadult; aged; Article; cancer grading; cancer surgery; case fatality rate; computer assisted tomography; elective surgery; female; follow up; health care policy; human; incidence; infection rate; infection risk; major clinical study; male; middle aged; mortality; outcome assessment; phase 3 clinical trial (topic); preoperative care; prospective study; sensitivity analysis; seroprevalence; Severe acute respiratory syndrome coronavirus 2; vaccination; young adult; COVID-19; COVID-19 Vaccines; Comorbidity; Elective Surgical Procedures; Postoperative Complications; Preoperative Period; SARS-CoV-2; Vaccination; surgery.Cura preoperatòriamajor clinical studymortalityinfectionProspective StudieincidenceSurgeryHuman medicinePostoperative Complication610 Medizin und GesundheitAcademicSubjects/MED00910Settore MED/18 - CHIRURGIA GENERALESettore MED/29 - CHIRURGIA MAXILLOFACCIALEcomputer assisted tomographyESTUDOS PROSPECTIVOSsurgerysafe surgeryPostoperative Complicationssensitivity analysisSevere acute respiratory syndrome coronavirus 2preoperative careVacunacióProspective cohort studyseroprevalenceIncidence (epidemiology)covidElective Surgical Procedures/methodsMiddle Agedcancer gradingCOVID vaccinationoutcome/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_beingSARS-CoV-2; vaccination; surgeryOriginal ArticleFemalecancer surgeryAcademicSubjects/MED00010Life Sciences & BiomedicineAdultCOVID-19 VaccinesAdolescentinternational prospective cohort studyPostoperative Complications/prevention & controlPopulationinfection rateSARS-CoV-2/immunologyNOmodellingYoung Adultmedicinefollow upcancerddc:610infection riskoutcome assessmentLS7_4business.industrySARS-CoV-2Number needed to vaccinatePreoperative careCOVID-193126 Surgery anesthesiology intensive care radiologySettore MED/18Reconstructive and regenerative medicine Radboud Institute for Health Sciences [Radboudumc 10]elective surgeryEmergency medicinebusiness[SDV.MHEP]Life Sciences [q-bio]/Human health and pathologyThe British Journal of Surgery
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A Fermi Gamma-Ray Burst Monitor Search for Electromagnetic Signals Coincident with Gravitational-wave Candidates in Advanced LIGO's First Observing R…

2019

We present a search for prompt gamma-ray counterparts to compact binary coalescence gravitational wave (GW) candidates from Advanced LIGO's first observing run (O1). As demonstrated by the multimessenger observations of GW170817/GRB 170817A, electromagnetic and GW observations provide complementary information about the astrophysical source and, in the case of weaker candidates, may strengthen the case for an astrophysical origin. Here we investigate low-significance GW candidates from the O1 compact-binary coalescence searches using the Fermi Gamma-ray Burst Monitor (GBM), leveraging its all-sky and broad energy coverage. Candidates are ranked and compared to background to measure signific…

AstrofísicaGravitacióAstronomyAstrophysics::High Energy Astrophysical Phenomenagamma-ray burst: generalFOS: Physical sciencesAstrophysicsAstronomy & Astrophysicsgeneral [gamma-ray burst]01 natural sciencesCoincidenceCoincident0103 physical sciences010306 general physics010303 astronomy & astrophysicsgravitational waveSTFCQCQBHigh Energy Astrophysical Phenomena (astro-ph.HE)Settore FIS/01Physicsastro-ph.HEScience & TechnologySolar flareGravitational wavegamma-ray burst: general; gravitational waves; Astronomy and Astrophysics; Space and Planetary ScienceRCUKAstronomy and AstrophysicsAstronomy and AstrophysicLIGOPhysics and Astronomygravitational wavesSpace and Planetary SciencePhysical Sciencesgamma-ray burst: general; gravitational wavesgeneral; gravitational waves; Astronomy and Astrophysics; Space and Planetary Science [gamma-ray burst]False alarmAstrophysics - High Energy Astrophysical PhenomenaGamma-ray burst[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]Fermi Gamma-ray Space Telescope
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Search for GW signals associated with GRBs

2021

We present the results of targeted searches for gravitational-wave transients associated with gamma-ray bursts during the second observing run of Advanced LIGO and Advanced Virgo, which took place from 2016 November to 2017 August. We have analyzed 98 gamma-ray bursts using an unmodeled search method that searches for generic transient gravitational waves and 42 with a modeled search method that targets compact-binary mergers as progenitors of short gamma-ray bursts. Both methods clearly detect the previously reported binary merger signal GW170817, with p-values of <9.38x10^-6^ (modeled) and 3.1x10^-4^ (unmodeled). We do not find any significant evidence for gravitational-wave signals assoc…

Astrophysics and AstronomyGamma-ray astronomyhigh energy astrophysicsAstrophysics::High Energy Astrophysical PhenomenaPhysicsAstrophysics::Cosmology and Extragalactic Astrophysicsstellar astronomyGamma ray burstsGravitational wavesCosmologyobservational astronomyGamma ray astronomyGamma-ray burstsAstrophysical ProcessesNatural Sciences
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