SIMBAD references

2014AJ....148....2L - Astron. J., 148, 2 (2014/July-0)

Identifying high-redshift gamma-ray bursts with RATIR.

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 DIEGO J.A., GEORGIEV L., GONZALEZ J., ROMAN-ZUNIGA C.G., GEHRELS N. and MOSELEY H.

Abstract (from CDS):

We present a template-fitting algorithm for determining photometric redshifts, zphot, 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 < zphot< 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 ≲ 8 and 9 < zphot< 10 and can robustly determine when zphot> 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 zphot< 4 when zsim> 4, thereby minimizing false negatives and allowing us to rapidly identify all potential high-redshift events.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: general - gamma-ray burst: individual: GRB 130606A - techniques: photometric

Simbad objects: 9

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