2006A&A...459L...5P

Query : 2006A&A...459L...5P

2006A&A...459L...5P - Astronomy and Astrophysics, volume 459, L5-8 (2006/11-3)

GRB 050223: a dark GRB in a dusty starburst galaxy.

PELLIZZA L.J., DUC P.-A., LE FLOC'H E., MIRABEL I.F., ANTONELLI L.A., CAMPANA S., CHINCARINI G., CIMATTI A., COVINO S., DELLA VALLE M., FIORE F., FUGAZZA D., GIOMMI P., GOLDONI P., ISRAEL G.L., MOLINARI E., MORETTI A., PIRO L., SARACCO P., STELLA L., TAGLIAFERRI G. and VIETRI M.

Abstract (from CDS):

We aim at detecting and determining the properties of the host galaxy of the dark GRB 050223. We use VLT optical/NIR images coupled to Swift X-ray positioning, and optical spectra of the host galaxy to measure its properties. We find a single galaxy within the Swift error box of GRB 050223. It is located at z=0.584 and its luminosity is L∼0.4L^*. Emission lines in the galaxy spectrum imply an intrinsic SFR>7M_☉/yr, and a large extinction A_V>2mag within it. We also detect absorption lines, which reveal an underlying stellar population with an age between 40Myr and 1.5Gyr. The identification of a host galaxy with atypical properties using only the X-ray transient suggests that a bias may be present in the former sample of host galaxies. Dust obscuration together with intrinsic faintness are the most probable causes for the darkness of this burst.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: bursts - galaxies: starburst

Nomenclature: Fig.1, text: [PDL2006] A (No. H).

Simbad objects: 9

Full paper

View the references in ADS

Number of rows : 9

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Sp type	#ref 1850 - 2024	#notes
1	GRB 000210	gB	01 59 15	-40 40.0	~	172	0
2	[LDM2003] GRB J015915.5-403933	G	01 59 15.61	-40 39 33.1	~	13	0
3	GRB 030115	gB	11 18 32.6	+15 02 59	~	89	1
4	GRB 050223	gB	18 05 32.200	-62 28 20.40	~	105	0
5	[PDL2006] H	G	18 05 32.992	-62 28 18.81	~	3	0
6	GRB 970828	gB	18 08 31.6	+59 18 51	~	346	1
7	GRB 990712	gB	22 31 53.061	-73 24 28.58	~	259	1
8	[LDM2003] GRB J223153.1-732429	G	22 31 53.1	-73 24 29	~	14	1
9	GRB 051022A	gB	23 56 04.200	+19 36 32.30	~	182	1

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