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Title: Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A

Abstract

Here, we present observations of the possible short GRB 180418A in γ-rays, X-rays, and in the optical. Early optical photometry with the TAROT and RATIR instruments shows a bright peak (≈14.2 AB mag) between T + 28 and T + 90 s that we interpret as the signature of a reverse shock. Later observations can be modeled by a standard forward shock model and show no evidence of a jet break, allowing us to constrain the jet collimation to θ j > 7°. Using deep late-time optical observations, we place an upper limit of r > 24 AB mag on any underlying host galaxy. The detection of the afterglow in the Swift UV filters constrains the GRB redshift to z < 1.3 and places an upper bound on the γ-ray isotropic equivalent energy E γ,iso < 3 ×1051 erg. The properties of this GRB (e.g., duration, hardness ratio, energy, and environment) lie at the intersection between short and long bursts, and we cannot conclusively identify its type. We estimate that the probability that it is drawn from the population of short GRBs is 10%-30%.

Authors:
ORCiD logo [1];  [2];  [1]; ORCiD logo [2]; ORCiD logo [1];  [3]; ORCiD logo [4];  [1]; ORCiD logo [5]; ORCiD logo [6];  [7]; ORCiD logo [8]; ORCiD logo [1];  [9]; ORCiD logo [10]; ORCiD logo [10]; ORCiD logo [11]
  1. Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico)
  2. Univ. of Maryland, College Park, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  3. Inst. de Recherce en Astronophysique et Panetologie, Toulous (France)
  4. Arizona State Univ., Tempe, AZ (United States)
  5. Univ. of Alabama, Huntsville, AL (United States)
  6. Chinese Academy of Science (CAS), Beijing (China)
  7. Univ. of Maryland, College Park, MD (United States)
  8. ARTEMIS, Nice (France)
  9. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  10. Univ. of California, Santa Cruz, CA (United States)
  11. Unidad Academica en Ensenada (Mexico)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); Consejo Nacional de Ciencia y Tecnología in Mexico (CONACyT); UNAM PA-PIIT; Universidad Nacional Autonoma de Mexico
OSTI Identifier:
1616087
Grant/Contract Number:  
AC02-05CH11231; NNX09AH71G; NNX09AT02G; NNX10AI27G; NNX12AE66G; INFR-2009-01-122785; CB-2008-101958; IG100414; IA102917; IA102019; CN 09-283
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 881; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gamma-ray burst

Citation Formats

Becerra, R. L., Dichiara, S., Watson, A. M., Troja, E., Fraija, N., Klotz, A., Butler, N. R., Lee, W. H., Veres, P., Turpin, D., Bloom, J. S., Boer, M., González, J. J., Kutyrev, A. S., Prochaska, J. X., Ramirez-Ruiz, E., and Richer, M. G.. Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A. United States: N. p., 2019. Web. https://doi.org/10.3847/1538-4357/ab275b.
Becerra, R. L., Dichiara, S., Watson, A. M., Troja, E., Fraija, N., Klotz, A., Butler, N. R., Lee, W. H., Veres, P., Turpin, D., Bloom, J. S., Boer, M., González, J. J., Kutyrev, A. S., Prochaska, J. X., Ramirez-Ruiz, E., & Richer, M. G.. Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A. United States. https://doi.org/10.3847/1538-4357/ab275b
Becerra, R. L., Dichiara, S., Watson, A. M., Troja, E., Fraija, N., Klotz, A., Butler, N. R., Lee, W. H., Veres, P., Turpin, D., Bloom, J. S., Boer, M., González, J. J., Kutyrev, A. S., Prochaska, J. X., Ramirez-Ruiz, E., and Richer, M. G.. Wed . "Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A". United States. https://doi.org/10.3847/1538-4357/ab275b. https://www.osti.gov/servlets/purl/1616087.
@article{osti_1616087,
title = {Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A},
author = {Becerra, R. L. and Dichiara, S. and Watson, A. M. and Troja, E. and Fraija, N. and Klotz, A. and Butler, N. R. and Lee, W. H. and Veres, P. and Turpin, D. and Bloom, J. S. and Boer, M. and González, J. J. and Kutyrev, A. S. and Prochaska, J. X. and Ramirez-Ruiz, E. and Richer, M. G.},
abstractNote = {Here, we present observations of the possible short GRB 180418A in γ-rays, X-rays, and in the optical. Early optical photometry with the TAROT and RATIR instruments shows a bright peak (≈14.2 AB mag) between T + 28 and T + 90 s that we interpret as the signature of a reverse shock. Later observations can be modeled by a standard forward shock model and show no evidence of a jet break, allowing us to constrain the jet collimation to θ j > 7°. Using deep late-time optical observations, we place an upper limit of r > 24 AB mag on any underlying host galaxy. The detection of the afterglow in the Swift UV filters constrains the GRB redshift to z < 1.3 and places an upper bound on the γ-ray isotropic equivalent energy E γ,iso < 3 ×1051 erg. The properties of this GRB (e.g., duration, hardness ratio, energy, and environment) lie at the intersection between short and long bursts, and we cannot conclusively identify its type. We estimate that the probability that it is drawn from the population of short GRBs is 10%-30%.},
doi = {10.3847/1538-4357/ab275b},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 881,
place = {United States},
year = {2019},
month = {8}
}

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Figures / Tables:

Fig. 1 Fig. 1: Swift/BAT light curve using a binning of 16 ms and observed in the range 15-350 keV. The red lines mark the start and end of the T90 interval.

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journal, January 2009


A complete reference of the analytical synchrotron external shock models of gamma-ray bursts
journal, December 2013


Grb 081007 and grb 090424: the Surrounding Medium, Outflows, and Supernovae
text, January 2013

  • P., Lacluyze, Aaron; Sergio, Campana,; David, Bersier,
  • The University of North Carolina at Chapel Hill University Libraries
  • DOI: 10.17615/689p-9g74

GW170817: Observation of gravitational waves from a binary neutron star inspiral
text, January 2017

  • Abbott, B. P.; Abbott, R.; Abbott, T. D.
  • American Physical Society
  • DOI: 10.5167/uzh-147231

    Works referencing / citing this record:

    Short GRB 160821B: A Reverse Shock, a Refreshed Shock, and a Well-sampled Kilonova
    journal, September 2019


    GRB 180620A: Evidence for Late-time Energy Injection
    journal, December 2019

    • Becerra, R. L.; De Colle, F.; Watson, A. M.
    • The Astrophysical Journal, Vol. 887, Issue 2
    • DOI: 10.3847/1538-4357/ab5859