1999ApJ...523..171V

Query : 1999ApJ...523..171V

1999ApJ...523..171V - Astrophys. J., 523, 171-176 (1999/September-3)

The X-ray, optical, and infrared counterpart to GRB 980703.

VREESWIJK P.M., GALAMA T.J., OWENS A., OOSTERBROEK T., GEBALLE T.R., VAN PARADIJS J., GROOT P.J., KOUVELIOTOU C., KOSHUT T., TANVIR N., WIJERS R.A.M.J., PIAN E., PALAZZI E., FRONTERA F., MASETTI N., ROBINSON C., BRIGGS M., IN'T ZAND J.J.M., HEISE J., PIRO L., COSTA E., FEROCI M., ANTONELLI L.A., HURLEY K., GREINER J., SMITH D.A., LEVINE A.M., LIPKIN Y., LEIBOWITZ E., LIDMAN C., PIZZELLA A., BOEHNHARDT H., DOUBLIER V., CHATY S., SMAIL I., BLAIN A., HOUGH J.H., YOUNG S. and SUNTZEFF N.

Abstract (from CDS):

We report on X-ray, optical, and infrared follow-up observations of GRB 980703. We detect a previously unknown X-ray source in the GRB error box; assuming a power-law decline, we find for its decay index α←0.91 (3 σ). We invoke host-galaxy extinction to match the observed spectral slope with the slope expected from ``fireball'' models. We find no evidence for a spectral break in the infrared to X-ray spectral range on 1998 July 4.4, and determine a lower limit of the cooling break frequency, νc>1.3x1017 Hz. For this epoch we obtain an extinction of AV=1.50±0.11. From the X-ray data we estimate the optical extinction to be AV=20.2+12.3–7.3, inconsistent with the former value. Our optical spectra confirm the redshift of z=0.966. We compare the afterglow of GRB 980703 with that of GRB 970508 and find that the fraction of the energy in the magnetic field, εB<6x10–5, is much lower in the case of GRB 980703, as a consequence of the high frequency of the cooling break.

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Journal keyword(s): Gamma Rays: Bursts - Infrared: Galaxies - Radiation Mechanisms: Nonthermal - X-Rays: Galaxies

Nomenclature: Table 1: [VGO99] Star N (Nos 1-4).

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 MCG+01-01-006 rG 00 00 07.0351702951 +08 16 45.075662392   16.0       ~ 46 1
2 NAME UGC 12890 Group GrG 00 00 10.6 +08 16 37           ~ 18 0
3 TYC 12-214-1 * 00 55 09.9093697848 +00 43 12.917223120 12.007 12.050 11.615 11.350 11.078 F8 32 0
4 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 883 1
5 GRB 971214 gB 11 56 26.4 +65 12 01           ~ 445 1
6 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1928 2
7 Feige 108 HS* 23 16 12.4074790200 -01 50 35.103759540 11.671 12.736 12.973 13.079 13.218 sdB 66 0
8 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 673 1
9 PG 2331+055 HS? 23 33 44.4698554608 +05 46 39.793017432 14.629 15.116 15.182 15.194 15.226 sd 36 0
10 SAX J2359.1+0835 X 23 59.1 +08 35           ~ 5 0
11 GRB 980703 gB 23 59 06.7 +08 35 07           ~ 453 1
12 OT 19980703 Rad 23 59 06.744 +08 35 07.29           ~ 6 0
13 RX J2359.9+0833 Sy1 23 59 59.2936255560 +08 33 54.036986796     15.40     ~ 12 0

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