2007A&A...461..485S


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.07CEST15:31:59

2007A&A...461..485S - Astronomy and Astrophysics, volume 461, 485-492 (2007/1-2)

X-ray flashes or soft gamma-ray bursts? The case of the likely distant XRF 040912.

STRATTA G., BASA S., BUTLER N., ATTEIA J.L., GENDRE B., PELANGEON A., MALACRINO F., MELLIER Y., KANN D.A., KLOSE S., ZEH A., MASETTI N., PALAZZI E., GOROSABEL J., CASTRO-TIRADO A.J., DE UGARTE POSTIGO A., JELINEK M., CEPA J., CASTANEDA H., MARTINEZ-DELGADO D., BOEER M., BRAGA J., CREW G., DONAGHY T.Q., DEZALAY J.-P., DOTY J., FENIMORE E.E., GALASSI M., GRAZIANI C., JERNIGAN J.G., KAWAI N., LAMB D.Q., LEVINE A., MANCHANDA R.K., MARTEL F., MATSUOKA M., NAKAGAWA Y., OLIVE J.-F., PIZZICHINI G., PRIGOZHIN G., RICKER G., SAKAMOTO T., SHIRASAKI Y., SUGITA S., SUZUKI M., TAKAGISHI K., TAMAGAWA T., VANDERSPEK R., VILLASENOR J., WOOSLEY S.E., YAMAUCHI M. and YOSHIDA A.

Abstract (from CDS):

The origin of X-ray Flashes (XRFs) is still a mystery and several models have been proposed. To disentangle among these models, an important observational tool is the measure of the XRF distance scale, so far available only for a few of them. In this work, we present a multi-wavelength study of XRF 040912, aimed at measuring its distance scale and the intrinsic burst properties. We performed a detailed spectral and temporal analysis of both the prompt and the afterglow emission and we estimated the distance scale of the likely host galaxy. We then used the currently available sample of XRFs with known distance to discuss the connection between XRFs and classical Gamma-ray Bursts (GRBs). We found that the prompt emission properties unambiguously identify this burst as an XRF, with an observed peak energy of Ep=17±13keV and a burst fluence ratio S2–30keV/S30–400keV>1. A non-fading optical source with R∼24mag and with an apparently extended morphology is spatially consistent with the X-ray afterglow, likely the host galaxy. XRF 040912 is a very dark burst since no afterglow optical counterpart is detected down to R>25mag (3σ limiting magnitude) at 13.6h after the burst. The host galaxy spectrum detected from 3800Å to 10000Å, shows a single emission line at 9552Å. The lack of any other strong emission lines blue-ward of the detected one and the absence of the Lyα cut-off down to 3800Å are consistent with the hypothesis of the [OII] line at redshift z=1.563±0.001. The intrinsic spectral properties rank this XRF among the soft GRBs in the Epeak-Eiso diagram. Similar results were obtained for most XRFs at known redshift. Only XRF 060218 and XRF 020903 represent a good example of instrinsic XRF (i-XRF) and are possibly associated with a different progenitor population. This scenario may call for a new definition of XRFs.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts

Simbad objects: 20

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Number of rows : 20

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 050824 gB 00 48 56.100 +22 36 32.00 19.66 21.03 20.46     ~ 156 0
2 GRB 000210 gB 01 59 15 -40 40.0           ~ 164 0
3 GRB 050406 gB 02 17 52.200 -50 11 15.81     18.83     ~ 117 0
4 SN 2006aj SN* 03 21 39.670 +16 52 02.27 17.96 19.11 17.40     SNIc-BL 828 1
5 GRB 021104 gB 03 53 48 +37 57.2           ~ 19 0
6 SN 2003lw SN* 08 02 30.1 -39 51 03       20.23   SNIc: 508 0
7 GRB 050215B gB 11 37 48.030 +40 47 43.39           ~ 62 0
8 GRB 030429 gB 12 13 07.495 -20 54 49.54           ~ 120 1
9 GRB 050416 gB 12 33 54.600 +21 03 26.69     19.12     ~ 253 1
10 GRB 040812 gB 16 26 08.5 -44 41 04           ~ 26 0
11 GRB 030528 gB 17 04 00.3 -22 37 10           ~ 84 1
12 GRB 040701 G 20 47 46.3 -40 14 13           ~ 42 1
13 GRB 030823 gB 21 30 47 +21 59.8           ~ 17 0
14 GRB 030723 gB 21 49 24.40 -27 42 47.4           ~ 120 0
15 GRB 020427 gB 22 09 28.3 -65 19 32           ~ 47 0
16 GRB 020903 gB 22 48 42.34 -20 46 09.3           ~ 215 1
17 GRB 981226 gB 23 29 37.2 -23 55 54           ~ 100 1
18 CXOU J235642.9-005520 X 23 56 42.91 -00 55 20.4           ~ 4 0
19 GRB 040912 gB 23 56 43.0 -00 55 20           ~ 35 0
20 CXOU J235656.4-005839 X 23 56 56.42 -00 58 39.2           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2020.08.07-15:31:59

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