Premise GW-GRB association GW Inference EMGW Inference Follow-up GW170817/GRB 170817A An Astronomy/Astrophysics Viewpoint Deep Chatterjee 12 on behalf of the LIGO-Virgo Collaboration 1 University of Wisconsin – Milwaukee 2 LIGO–Virgo Collaboration Rencontres de Moriond, La Thuile March 26, 2019
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Premise GW-GRB association GW Inference EMGW Inference Follow-up
Premise GW-GRB association GW Inference EMGW Inference Follow-up
Follow-up campaign
• GW170817:
• First success story ofelectromagnetic &gravitational-wave (EMGW)astronomy.
• Follow-up operations wereunprecedented.
O2 partners
• Need for a rapid, robust alert infrastructure:• Semi-automated with low false alarm.• Data products from GW side to aid EM follow-up.• Crucial to capture the transient at early times.
Premise GW-GRB association GW Inference EMGW Inference Follow-up
Public AlertsFor the first time, LIGO-Virgo Alerts will be public!
PreliminaryAlert Sent
Rapid Localization Classification
Automated Vetting Set Preferred Event
Original Detection
Initial Alert orRetraction Sent
Classification Human Vetting
Parameter Estimation
10 second 1 minute 1 hour 1 day 1 week
UpdateAlert Sent Classification
Parameter Estimation
• All alerts are sent over Gamma-ray Coordinate Network (GCN)
• Retractions might happen at the Initial stage
• Circulars are sent during Initial alert
Premise GW-GRB association GW Inference EMGW Inference Follow-up
Low-latency Data ProductsSkymaps Chances of EM-counterpart
100 101 102
m1[M ]
100
101
m2[
M]
BNS NSBH
BBH
Mrem =0
Pastro by source category
Premise GW-GRB association GW Inference EMGW Inference Follow-up
Combined SkymapsWill be sent for Fermi and IceCube
(a) GW170817 (HL) (b) Fermi GBM
(c) Combined
Premise GW-GRB association GW Inference EMGW Inference Follow-up
Premise GW-GRB association GW Inference EMGW Inference Follow-up
Abbott, B. P. et al. (2017a).
Estimating the contribution of dynamical ejecta in the kilonova associated with GW170817.The Astrophysical Journal, 850(2):L39.
Abbott, B. P. et al. (2017b).
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Abbott, B. P. et al. (2017c).
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Abbott, B. P. et al. (2017d).
Multi-messenger Observations of a Binary Neutron Star Merger.ApJ Lett., 848:L12.
Abbott, B. P. et al. (2017e).
On the progenitor of binary neutron star merger GW170817.The Astrophysical Journal, 850(2):L40.
Abbott, B. P. et al. (2017f).
Search for Post-merger Gravitational Waves from the Remnant of the Binary Neutron Star MergerGW170817.ApJ Lett., 851:L16.
Abbott, B. P. et al. (2018a).
GW170817: Measurements of Neutron Star Radii and Equation of State.Phys. Rev. Lett., 121:161101.
Abbott, B. P. et al. (2018b).
GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO andVirgo during the First and Second Observing Runs.arXiv e-prints, page arXiv:1811.12907.
Abbott, B. P. et al. (2019).
Premise GW-GRB association GW Inference EMGW Inference Follow-up
Properties of the Binary Neutron Star Merger GW170817.Physical Review X, 9:011001.
Dietrich, T. and Ujevic, M. (2017).
Modeling dynamical ejecta from binary neutron star mergers and implications for electromagneticcounterparts.Classical and Quantum Gravity, 34:105014.
Goldstein, A. et al. (2017).
An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi-GBM Detection of GRB170817A.ApJL, 848:L14.
The LIGO Scientific Collaboration, The Virgo Collaboration, The 1M2H Collaboration, The Dark Energy
Camera GW-EM Collaboration, The DES Collaboration, The DLT40 Collaboration, The Las CumbresObservatory Collaboration, The VINROUGE Collaboration, and The MASTER Collaboration (2017).A gravitational-wave standard siren measurement of the Hubble constant.Nature, 551(7678):85–88.