THE AFTERGLOW AND EARLY-TYPE HOST GALAXY OF THE SHORT GRB 150101B AT z = 0.1343

W. Fong, R. Margutti, R. Chornock, E. Berger, B. J. Shappee, A. J. Levan, N. R. Tanvir, N. Smith, P. A. Milne, T. Laskar, D. B. Fox, R. Lunnan, P. K. Blanchard, J. Hjorth, K. Wiersema, A. J. Van Der Horst, D. Zaritsky

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Abstract

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 gamma-ray burst (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 $\approx 7\times {10}^{10}\,{M}_{\odot }$, stellar population age of ≈2–2.5 Gyr, and star formation rate of lesssim0.4 M ⊙ 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 $\approx 4.3{L}^{* }$ 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 an NS–NS/NS–BH merger progenitor. From modeling the evolution of the broadband afterglow, we calculate isotropic-equivalent gamma-ray and kinetic energies of $\approx 1.3\times {10}^{49}$ erg and $\approx (6\mbox{--}14)\times {10}^{51}$ erg, respectively, a circumburst density of $\approx (0.8\mbox{--}4)\times {10}^{-5}$ cm−3, and a jet opening angle of gsim9°. Using observations extending to ≈30 days, we place upper limits of $\lesssim (2\mbox{--}4)\times {10}^{41}$ 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.
Original languageEnglish
Pages (from-to)151
Number of pages14
JournalAstrophysical Journal
Volume833
Issue number2
DOIs
Publication statusPublished - 14 Dec 2016

Cite this

Fong, W., Margutti, R., Chornock, R., Berger, E., Shappee, B. J., Levan, A. J., Tanvir, N. R., Smith, N., Milne, P. A., Laskar, T., Fox, D. B., Lunnan, R., Blanchard, P. K., Hjorth, J., Wiersema, K., Van Der Horst, A. J., & Zaritsky, D. (2016). THE AFTERGLOW AND EARLY-TYPE HOST GALAXY OF THE SHORT GRB 150101B AT z = 0.1343. Astrophysical Journal, 833(2), 151. https://doi.org/10.3847/1538-4357/833/2/151