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Observations of the first electromagnetic counterpart to a gravitational wave source by the TOROS collaboration

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arxiv 1710.05844 v1 pith:CXRK2CGD submitted 2017-10-16 astro-ph.HE astro-ph.SR

classification astro-ph.HEastro-ph.SR
keywords counterpartdeltaeventobservationscollaborationelectromagneticobtainedoptical
verification ladder T0 review T1 audit T2 compute T3 formal
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We present the results of prompt optical follow-up of the electromagnetic counterpart of the gravitational-wave event GW170817 by the Transient Optical Robotic Observatory of the South Collaboration (TOROS). We detected highly significant dimming in the light curves of the counterpart (Delta g=0.17+-0.03 mag, Delta r=0.14+-0.02 mag, Delta i=0.10 +- 0.03 mag) over the course of only 80 minutes of observations obtained ~35 hr after the trigger with the T80-South telescope. A second epoch of observations, obtained ~59 hr after the event with the EABA 1.5m telescope, confirms the fast fading nature of the transient. The observed colors of the counterpart suggest that this event was a "blue kilonova" relatively free of lanthanides.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 140 citations worldwide. Full citation record

  1. 3D Binary Neutron Star Merger Ejecta Evolution up to Seconds Timescale: Dynamics, Element Distribution, and Light Curves

    astro-ph.HE 2026-08 conditional novelty 6.0 of 10

    Long 3D simulations of neutron star merger ejecta show radioactive heating keeps reshaping heavy-element outflows, and 3D light curves are dimmer but no closer to AT2017gfo than 2D ones.

  2. Binary neutron stars in the next-generation era: Multi-messenger detection prospects and constraints on the equation of state, mass distribution, and cosmology

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    With ET (and ET+CE), mock multi-messenger BNS catalogues yield ~40–500 EM counterparts per year and, under ideal recovery, constrain R1.4 to ~0.2 km and H0 to ~1 km s−1 Mpc−1.

  3. Gamma-ray burst progenitors revisited

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    About 30–40% of long gamma-ray bursts at z<0.3 lack supernova emission and likely arise from compact object mergers, at rates comparable to short GRBs.

  4. Rapid and robust simulation-based inference for kilonovae

    astro-ph.IM 2026-05 unverdicted novelty 6.0 of 10

    Simulation-based inference with a Gaussian process emulator trained on ~1300 POSSIS simulations enables rapid, robust kilonova parameter estimation that avoids MCMC biases from likelihood misspecification.

  5. Kilonovae

    astro-ph.HE 2019-08 unverdicted novelty 2.0 of 10

    Kilonova theory, including the blue and red two-component picture, is reviewed and shown to match the observed GW170817 counterpart, with predictive extensions for future mergers.

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