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

Journal Article · · The Astrophysical Journal (Online)
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)
+ Show Author Affiliations

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%.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
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
Grant/Contract Number:
AC02-05CH11231; NNX09AH71G; NNX09AT02G; NNX10AI27G; NNX12AE66G; INFR-2009-01-122785; CB-2008-101958; IG100414; IA102917; IA102019; CN 09-283
OSTI ID:
1616087
Journal Information:
The Astrophysical Journal (Online), Vol. 881, Issue 1; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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conference January 2008
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Optical and gamma-ray emissions from internal forward-reverse shocks: application to GRB 080319B? text January 2008
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A snapshot on galaxy evolution occurring in the Great Wall: the role of Nurture at z=0 text January 2010
Accurate evolutions of inspiralling and magnetized neutron-stars: equal-mass binaries text January 2010
Ten per cent polarized optical emission from GRB 090102 text January 2010
Fermi/GBM observations of the ultra-long GRB 091024: A burst with an optical flash text January 2011
GRB 090426: Discovery of a jet break in a short burst afterglow text January 2011
Gamma Ray Bursts in the Swift-Fermi Era text January 2013
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Reverse Shock Emission in Gamma-ray Bursts Revisited text January 2015
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Theoretical Description Of GRB 160625B with Wind-to-ISM Transition and Implications for a Magnetized Outflow text January 2017
Statistical Distributions of Optical Flares from Gamma-Ray Bursts text January 2017
Modeling the high-energy emission in GRB 110721A and implications on the early multiwavelength and polarimetric observations text January 2017
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral text January 2017
The short GRB 170817A: Modelling the off-axis emission and implications on the ejecta magnetization text January 2017
The Observed Offset Distribution of Gamma-Ray Bursts from Their Host Galaxies: A Robust Clue to the Nature of the Progenitors text January 2000
Was GRB 990123 a unique optical flash? text January 2001
The afterglow of GRB021211: Another case of reverse shock emission text January 2003
Afterglow Light Curves from Impulsive Relativistic Jets with an Unconventional Structure text January 2005
Late internal shock model for bright X-ray flares in Gamma-ray Burst afterglows and GRB 011121 text January 2005
Jet Breaks in Short Gamma-Ray Bursts. II: The Collimated Afterglow of GRB 051221A text January 2006
A New Population of High Redshift Short-Duration Gamma-Ray Bursts text January 2006
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The Troublesome Broadband Evolution of GRB 061126: Does a Grey Burst Imply Grey Dust? text January 2007
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Counts and Colors of Faint Galaxies in the U and R Bands text January 1997
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Cited By (5)

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
Short GRB 160821B: a reverse shock, a refreshed shock, and a well-sampled kilonova text January 2019
GRB 180620A: Evidence for late-time energy injection text January 2019
Search for very-high-energy photons from Gamma-ray bursts with HAWC preprint January 2019

Figures / Tables (15)

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