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Title: Identifying high-redshift gamma-ray bursts with RATIR

We present a template-fitting algorithm for determining photometric redshifts, z {sub phot}, of candidate high-redshift gamma-ray bursts (GRBs). Using afterglow photometry, obtained by the Reionization and Transients InfraRed (RATIR) camera, this algorithm accounts for the intrinsic GRB afterglow spectral energy distribution, host dust extinction, and the effect of neutral hydrogen (local and cosmological) along the line of sight. We present the results obtained by this algorithm and the RATIR photometry of GRB 130606A, finding a range of best-fit solutions, 5.6 < z {sub phot} < 6.0, for models of several host dust extinction laws (none, the Milky Way, Large Magellanic Clouds, and Small Magellanic Clouds), consistent with spectroscopic measurements of the redshift of this GRB. Using simulated RATIR photometry, we find that our algorithm provides precise measures of z {sub phot} in the ranges of 4 < z {sub phot} ≲ 8 and 9 < z {sub phot} < 10 and can robustly determine when z {sub phot} > 4. Further testing highlights the required caution in cases of highly dust-extincted host galaxies. These tests also show that our algorithm does not erroneously find z {sub phot} < 4 when z {sub sim} > 4, thereby minimizing false negatives andmore » allowing us to rapidly identify all potential high-redshift events.« less
Authors:
;  [1] ;  [2] ; ; ; ; ; ; ;  [3] ; ; ; ;  [4] ; ; ;  [5] ; ;  [6]
  1. School of Earth and Space Exploration, Arizona State University, AZ 85287 (United States)
  2. Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  3. Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, 04510 México, D. F. (Mexico)
  4. NASA, Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  5. Astronomy Department, University of California, Berkeley, CA 94720-7450 (United States)
  6. Department of Astronomy and Astrophysics, UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064 (United States)
Publication Date:
OSTI Identifier:
22342311
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 148; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; ALGORITHMS; COSMIC GAMMA BURSTS; DUSTS; ENERGY SPECTRA; MAGELLANIC CLOUDS; MATHEMATICAL SOLUTIONS; MILKY WAY; PHOTOMETRY; RED SHIFT; SIMULATION; T-10 TOKAMAK; TRANSIENTS