The Afterglow and Early-Type Host Galaxy of the Short GRB 150101B at z=0.1343

We present the discovery of the X-ray and optical afterglows of the short-duration GRB 150101B, pinpointing the event to an early-type host galaxy at z=0.1343 +/- 0.0030. This makes GRB 150101B the most nearby short GRB with an early-type host galaxy discovered to date. Fitting the spectral energy d...

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Hauptverfasser: Wen-fai Fong, Margutti, Raffaella, Ryan Chornock, Berger, Edo, Shappee, Benjamin J, Levan, Andrew J, Tanvir, Nial R, Smith, Nathan, Milne, Peter A, Laskar, Tanmoy, Fox, Derek B, Lunnan, Ragnhild, Blanchard, Peter K, Hjorth, Jens, Wiersema, Klaas, Alexander J van der Horst, Zaritsky, Dennis
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container_title arXiv.org
container_volume
creator Wen-fai Fong
Margutti, Raffaella
Ryan Chornock
Berger, Edo
Shappee, Benjamin J
Levan, Andrew J
Tanvir, Nial R
Smith, Nathan
Milne, Peter A
Laskar, Tanmoy
Fox, Derek B
Lunnan, Ragnhild
Blanchard, Peter K
Hjorth, Jens
Wiersema, Klaas
Alexander J van der Horst
Zaritsky, Dennis
description We present the discovery of the X-ray and optical afterglows of the short-duration GRB 150101B, pinpointing the event to an early-type host galaxy at z=0.1343 +/- 0.0030. This makes GRB 150101B the most nearby short GRB with an early-type host galaxy discovered to date. Fitting the spectral energy distribution of the host galaxy results in an inferred stellar mass of ~7x10^10 M_sol, stellar population age of ~2-2.5 Gyr, and star formation rate of 9 deg. Using observations extending to ~30 days, we place upper limits of
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This makes GRB 150101B the most nearby short GRB with an early-type host galaxy discovered to date. Fitting the spectral energy distribution of the host galaxy results in an inferred stellar mass of ~7x10^10 M_sol, stellar population age of ~2-2.5 Gyr, and star formation rate of &lt;0.4 M_sol yr^-1. The host of GRB 150101B is one of the largest and most luminous short GRB host galaxies, with a B-band luminosity of ~4.3L* and half-light radius of ~8 kpc. GRB 150101B is located at a projected distance of 7.35 +/- 0.07 kpc from its host center, and lies on a faint region of its host rest-frame optical light. Its location, combined with the lack of associated supernova, is consistent with a NS-NS/NS-BH merger progenitor. From modeling the evolution of the broad-band afterglow, we calculate isotropic-equivalent gamma-ray and kinetic energies of ~1.3x10^49 erg and ~(6-14)x10^51 erg, respectively, a circumburst density of ~(0.8-4)x10^-5 cm^-3, and a jet opening angle of &gt;9 deg. Using observations extending to ~30 days, we place upper limits of &lt;(2-4)x10^41 erg s^-1 on associated kilonova emission. We compare searches following previous short GRBs to existing kilonova models, and demonstrate the difficulty of performing effective kilonova searches from cosmological short GRBs using current ground-based facilities. 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This makes GRB 150101B the most nearby short GRB with an early-type host galaxy discovered to date. Fitting the spectral energy distribution of the host galaxy results in an inferred stellar mass of ~7x10^10 M_sol, stellar population age of ~2-2.5 Gyr, and star formation rate of &lt;0.4 M_sol yr^-1. The host of GRB 150101B is one of the largest and most luminous short GRB host galaxies, with a B-band luminosity of ~4.3L* and half-light radius of ~8 kpc. GRB 150101B is located at a projected distance of 7.35 +/- 0.07 kpc from its host center, and lies on a faint region of its host rest-frame optical light. Its location, combined with the lack of associated supernova, is consistent with a NS-NS/NS-BH merger progenitor. From modeling the evolution of the broad-band afterglow, we calculate isotropic-equivalent gamma-ray and kinetic energies of ~1.3x10^49 erg and ~(6-14)x10^51 erg, respectively, a circumburst density of ~(0.8-4)x10^-5 cm^-3, and a jet opening angle of &gt;9 deg. Using observations extending to ~30 days, we place upper limits of &lt;(2-4)x10^41 erg s^-1 on associated kilonova emission. We compare searches following previous short GRBs to existing kilonova models, and demonstrate the difficulty of performing effective kilonova searches from cosmological short GRBs using current ground-based facilities. We show that at the Advanced LIGO/VIRGO horizon distance of 200 Mpc, searches reaching depths of ~23-24 AB mag are necessary to probe a meaningful range of kilonova models.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1608.08626</doi><oa>free_for_read</oa></addata></record>
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subjects Afterglows
Astronomical models
Galaxies
Galaxy distribution
Gamma ray bursts
Gamma rays
Luminosity
Physics - High Energy Astrophysical Phenomena
Searching
Spectral energy distribution
Star & galaxy formation
Star formation rate
Stellar age
Stellar mass
title The Afterglow and Early-Type Host Galaxy of the Short GRB 150101B at z=0.1343
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