2011A&A...526A.153K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:41:46

2011A&A...526A.153K - Astronomy and Astrophysics, volume 526A, 153-153 (2011/2-1)

Photometric redshifts for gamma-ray burst afterglows from GROND and Swift/UVOT.

KRUEHLER T., SCHADY P., GREINER J., AFONSO P., BOTTACINI E., CLEMENS C., FILGAS R., KLOSE S., KOCH T.S., KUEPCUE-YOLDAS A., OATES S.R., OLIVARES E.F., PAGE M.J., McBREEN S., NARDINI M., NICUESA GUELBENZU A., RAU A., ROMING P.W.A., ROSSI A., UPDIKE A. and YOLDAS A.

Abstract (from CDS):

We present a framework to obtain photometric redshifts (photo-zs) for gamma-ray burst afterglows. Using multi-band photometry from GROND and Swift/UVOT, photo-zs are derived for five GRBs for which spectroscopic redshifts are not available. We use UV/optical/NIR data and synthetic photometry based on afterglow observations and theory to derive the photometric redshifts of GRBs and their accuracy. Taking into account the afterglow synchrotron emission properties, we investigate the application of photometry to derive redshifts in a theoretical range between z∼1 to z∼12. The measurement of photo-zs for GRB afterglows provides a quick, robust and reliable determination of the distance scale to the burst, particularly in those cases where spectroscopic observations in the optical/NIR range cannot be obtained. Given a sufficiently bright and mildly reddened afterglow, the relative photo-z accuracy η=Δz/(1+z) is better than 10% between z=1.5 and z∼7 and better than 5% between z=2 and z=6. We detail the approach on 5 sources without spectroscopic redshifts observed with UVOT on-board Swift and/or GROND. The distance scale to those same afterglows is measured to be z=4.31+0.14–0.15 for GRB 080825B, z=2.13+0.14–0.20 for GRB 080906, z=3.44+0.15–0.32 for GRB 081228, z=2.03+0.16–0.14 for GRB 081230 and z=1.28+0.16–0.15 for GRB 090530. Due to the exceptional luminosity and simple continuum spectrum of GRB afterglows, photometric redshifts can be obtained to an accuracy as good as η∼0.03 over a large redshift range including robust (η∼0.1) measurements in the ultra-high redshift regime (zγ7). Combining the response from UVOT with ground-based observatories and in particular GROND operating in the optical/NIR wavelength regime, reliable photo-zs can be obtained from z∼1.0 out to z∼10, and possibly even at higher redshifts in some favorable cases, provided that these GRBs exist, are localized quickly, have sufficiently bright afterglows and are not heavily obscured.

Abstract Copyright:

Journal keyword(s): gamma rays bursts: general - techniques: photometric

Simbad objects: 32

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Number of rows : 32

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 GRB 071031 gB 00 25 37.40 -58 03 33.9           ~ 142 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
3 GRB 070802 gB 02 27 35.91 -55 31 39.1           ~ 136 0
4 GRB 081230 gB 02 29 19.20 -25 08 42.6           ~ 37 0
5 GRB 081228 gB 02 37 50.80 +30 51 09.2           ~ 32 0
6 GSC 00048-01015 * 02 57 21.2100302481 +00 18 38.643655747 12.136 12.028 11.725 11.549 11.363 A2 31 0
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
8 GRB 070318 gB 03 13 56.830 -42 56 46.30 18.27 16.23 15.49     ~ 139 0
9 GRB 091029 gB 04 00 40.00 -55 57 12.7           ~ 117 0
10 GRB 080913 gB 04 22 57.90 -25 07 38.6           ~ 174 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
12 QSO B0537-286 QSO 05 39 54.28147645 -28 39 55.9478122   19.70 20.0 18.789   ~ 240 2
13 GRB 081121 gB 05 57 07.70 -60 36 42.1           ~ 110 0
14 GRB 080928 gB 06 20 16.85 -55 11 59.3           ~ 128 1
15 GRB 080129 gB 07 01 08.13 -07 50 47.8           ~ 67 0
16 GRB 081028 gB 08 07 34.40 +02 18 16.8           ~ 91 0
17 GRB 090516A gB 09 12 59 -11 50.9           ~ 121 0
18 GRB 090519 gB 09 29 16.20 +00 11 23.9           ~ 72 0
19 GRB 090423 gB 09 55 33.19 +18 08 57.7           ~ 309 0
20 GRB 100219A gB 10 16 48.46 -12 34 00.2           ~ 90 0
21 TYC 4932-345-1 * 11 56 46.1577332389 -00 23 14.713577080 12.192 12.249 11.836 11.574 11.301 F3 9 0
22 GRB 090530 gB 11 57 36.00 +26 35 23.0           ~ 62 0
23 GRB 090426 gB 12 36 19.49 +32 59 05.5           ~ 157 0
24 GRB 090323 gB 12 42 50.28 +17 03 11.9           ~ 183 1
25 GRB 090313 gB 13 13 36.00 +08 05 10.7           ~ 116 0
26 GRB 080825B gB 13 56 48.2 -68 57 18           ~ 15 0
27 GRB 090205 gB 14 43 40.00 -27 50 51.4           ~ 70 0
28 GRB 080906 gB 15 12 13 -80 32.4           ~ 43 0
29 GRB 081008 gB 18 39 52.40 -57 25 58.8           ~ 156 0
30 GRB 080804 gB 21 54 41.90 -53 11 20.2           ~ 117 0
31 GRB 081029 gB 23 07 06 -68 10.7           ~ 93 0
32 GRB 090812 gB 23 32 48.5 -10 36 17           ~ 121 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:41:46

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