2008A&A...491..183P


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.05CEST00:28:21

2008A&A...491..183P - Astronomy and Astrophysics, volume 491, 183-188 (2008/11-3)

The short GRB070707 afterglow and its very faint host galaxy.

PIRANOMONTE S., D'AVANZO P., COVINO S., ANTONELLI L.A., BEARDMORE A.P., CAMPANA S., CHINCARINI G., D'ELIA V., DELLA VALLE M., FIORE F., FUGAZZA D., GUETTA D., GUIDORZI C., ISRAEL G.L., LAZZATI D., MALESANI D., PARSONS A.M., PERNA R., STELLA L., TAGLIAFERRI G. and VERGANI S.D.

Abstract (from CDS):

We present the results from an ESO/VLT campaign aimed at studying the afterglow properties of the short/hard gamma ray burst GRB070707. Observations were carried out at ten different epochs from ∼0.5 to ∼80 days after the event. The optical flux decayed steeply with a power-law decay index greater than 3, later levelling off at R∼27.3mag; this is likely the emission level of the host galaxy, the faintest yet detected for a short GRB. Spectroscopic observations did not reveal any line features/edges that could unambiguously pinpoint the GRB redshift, but set a limit z<3.6. In the range of allowed redshifts, the host has a low luminosity, comparable to that of long-duration GRBs. The existence of such faint host galaxies suggests caution when associating short GRBs with bright, offset galaxies, where the true host might just be too dim for detection. The steepness of the decay of the optical afterglow of GRB070707 challenges external shock models for the optical afterglow of short/hard GRBs. We argue that this behaviour might result from prolonged activity of the central engine or require alternative scenarios.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts

Nomenclature: Table 4: [PDC2008] GN (Nos G1-G6).

Status at CDS:  

Simbad objects: 17

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Number of rows : 17

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 070714B gB 03 51 22.30 +28 17 51.3           ~ 164 1
2 GRB 071227 gB 03 52 31.09 -55 59 03.3           ~ 141 0
3 GRB 061006 gB 07 24 07.660 -79 11 55.10           ~ 157 1
4 GRB 050724 gB 16 24 44.400 -27 32 27.90     19.70     ~ 378 1
5 [PDC2008] G6 G 17 50 57.18 -68 55 29.4       20.4   ~ 1 0
6 [PDC2008] G2 G 17 50 58.40 -68 53 01.5       20.5   ~ 1 0
7 NAME GRB 070707 HOST Galaxy G 17 50 58.49 -68 55 27.0       27.3   ~ 3 0
8 GRB 070707 gB 17 50 58.49 -68 55 27.0           ~ 51 1
9 [PDC2008] G1 G 17 50 58.55 -68 53 35.0       21.1   ~ 1 0
10 [PDC2008] G5 G 17 50 58.97 -68 55 12.8       20.5   ~ 1 0
11 [PDC2008] G4 G 17 51 00.67 -68 55 01.8       17.6   ~ 1 0
12 [PDC2008] G3 G 17 51 04.73 -68 54 27.0       20.2   ~ 1 0
13 GRB 080503 gB 19 06 28.74 +68 47 35.8           ~ 123 0
14 GRB 051221 gB 21 54 48.626 +16 53 27.16 19.49         ~ 299 1
15 GRB 061201 gB 22 08 32.060 -74 34 47.90           ~ 150 0
16 GRB 050709 gB 23 01 26.960 -38 58 39.50           ~ 251 1
17 NAME Local Group GrG ~ ~           ~ 6851 0

    Equat.    Gal    SGal    Ecl

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2020.04.05-00:28:21

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