2001A&A...370..398C


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.20CEST15:04:45

2001A&A...370..398C - Astronomy and Astrophysics, volume 370, 398-406 (2001/5-1)

The extraordinarily bright optical afterglow of GRB 991208 and its host galaxy

CASTRO-TIRADO A.J., SOKOLOV V.V., GOROSABEL J., CASTRO CERON J.M., GREINER J., WIJERS R.A.M.J., JENSEN B.L., HJORTH J., TOFT S., PEDERSEN H., PALAZZI E., PIAN E., MASETTI N., SAGAR R., MOHAN V., PANDEY A.K., PANDEY S.B., DODONOV S.N., FATKHULLIN T.A., AFANASIEV V.L., KOMAROVA V.N., MOISEEV A.V., HUDEC R., SIMON V., VREESWIJK P., ROL E., KLOSE S., STECKLUM B., ZAPATERO-OSORIO M.R., CAON N., BLAKE C., WALL J., HEINLEIN D., HENDEN A., BENETTI S., MAGAZZU A., GHINASSI F., TOMMASI L., BREMER M., KOUVELIOTOU C., GUZIY S., SHLYAPNIKOV A., HOPP U., FEULNER G., DREIZLER S., HARTMANN D., BOEHNHARDT H., PAREDES J.M., MARTI J., XANTHOPOULOS E., KRISTEN H.E., SMOKER J. and HURLEY K.

Abstract (from CDS):

Broad-band optical observations of the extraordinarily bright optical afterglow of the intense gamma-ray burst GRB 991208 started ∼2.1 days after the event and continued until 4 Apr. 2000. The flux decay constant of the optical afterglow in the R-band is -2.30±0.07 up to ∼5 days, which is very likely due to the jet effect, and it is followed by a much steeper decay with constant -3.2±0.2, the fastest one ever seen in a GRB optical afterglow. A negative detection in several all-sky films taken simultaneously with the event, that otherwise would have reached naked eye brightness, implies either a previous additional break prior to ∼2 days after the occurrence of the GRB (as expected from the jet effect) or a maximum, as observed in GRB 970508. The existence of a second break might indicate a steepening in the electron spectrum or the superposition of two events, resembling GRB 000301C. Once the afterglow emission vanished, contribution of a bright underlying supernova was found on the basis of the late-time R-band measurements, but the light curve is not sufficiently well sampled to rule out a dust echo explanation. Our redshift determination of z=0.706 indicates that GRB 991208 is at 3.7 Gpc (for H0= 60km/s/Mpc, Ω0=1 and Λ0=0), implying an isotropic energy release of 1.15x1053erg which may be relaxed by beaming by a factor > 102. Precise astrometry indicates that the GRB coincides within 0.2'' with the host galaxy, thus supporting a massive star origin. The absolute magnitude of the galaxy is MB = -18.2, well below the knee of the galaxy luminosity function and we derive a star-forming rate of (11.5±7.1)M.yr-1, which is much larger than the present-day rate in our Galaxy. The quasi-simultaneous broad-band photometric spectral energy distribution of the afterglow was determined ∼3.5 day after the burst (Dec. 12.0) implying a cooling frequency νc below the optical band, i.e. supporting a jet model with p = -2.30 as the index of the power-law electron distribution.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - galaxies: general - cosmology: observations

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 - 2019
#notes
1 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 623 1
2 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 835 1
3 BD+75 325 HS* 08 10 49.4901623070 +74 57 57.936226530 8.002 9.23 9.50 9.698 9.884 sdO5 230 0
4 GRB 980326 gB 08 36 34.3 -18 51 24           ~ 255 0
5 GRB 000418 gB 12 25 21 +20 05.0           ~ 198 0
6 HZ 44 HS* 13 23 35.2632775627 +36 07 59.545982652 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 362 0
7 GRB 990510 gB 13 38 07.64 -80 29 48.8           ~ 461 1
8 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 955 1
9 GRB 000301C gB 16 20 18.5 +29 26 35           ~ 337 2
10 GRB 991208 gB 16 33 53.51 +46 27 21.5           ~ 240 1
11 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1610 2
12 GRB 990712 gB 22 31 53.061 -73 24 28.58           ~ 246 1
13 GRB 980519 gB 23 22 21.5 +77 15 43           ~ 193 0

    Equat.    Gal    SGal    Ecl

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2019.09.20-15:04:45

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