Description

We present a template-fitting algorithm for determining photometric redshifts, z 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,

We present a template-fitting algorithm for determining photometric redshifts, z 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 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 zphot in the ranges of 4 < zphot lesssim 8 and 9 < zphot < 10 and can robustly determine when z 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 phot < 4 when z sim > 4, thereby minimizing false negatives and allowing us to rapidly identify all potential high-redshift events.

Downloads
pdf (0 B)

Details

Title
  • Identifying High-Redshift Gamma-Ray Bursts With RATIR
Contributors
Date Created
2014-07-01
Resource Type
  • Text
  • Collections this item is in
    Identifier
    • Digital object identifier: 10.1088/0004-6256/148/1/2
    • Identifier Type
      International standard serial number
      Identifier Value
      0004-6256
    Note

    Citation and reuse

    Cite this item

    This is a suggested citation. Consult the appropriate style guide for specific citation guidelines.

    Littlejohns, O. M., Butler, N. R., Cucchiara, A., Watson, A. M., Kutyrev, A. S., Lee, W. H., Richer, M. G., Klein, C. R., Fox, O. D., Prochaska, J. X., Bloom, J. S., Troja, E., Ramirez-Ruiz, E., de Dieg, J. A., Georgiev, L., Gonzalez, J., Roman-Zuniga, C. G., Gehrels, N., & Moseley, H. (2014). IDENTIFYING HIGH-REDSHEFT GAMMA-RAY BURSTS WITH RATIR. ASTRONOMICAL JOURNAL, 148(1). http://dx.doi.org/10.1088/0004-6256/148/1/2

    Machine-readable links