2006MNRAS.365.1031D

Query : 2006MNRAS.365.1031D

2006MNRAS.365.1031D - Mon. Not. R. Astron. Soc., 365, 1031-1038 (2006/January-3)

Swift and optical observations of GRB 050401.

DE PASQUALE M., BEARDMORE A.P., BARTHELMY S.D., BOYD P., BURROWS D.N., FINK R., GEHRELS N., KOBAYASHI S., MASON K.O., McNOUGHT R., NOUSEK J.A., PAGE K.L., PALMER D.M., PETERSON B.A., PRICE P.A., RICH J., ROMING P., ROSEN S.R., SAKAMOTO T., SCHMIDT B.P., TUELLER J., WELLS A.A., ZANE S., ZHANG B. and ZIAEEPOUR H.

Abstract (from CDS):

We present the results of the analysis of γ-ray and X-ray data of GRB 050401 taken with the Swift satellite, together with a series of ground-based follow-up optical observations. The Swift X-ray light curve shows a clear break at about 4900 s after the γ-ray burst (GRB). The decay indices before and after the break are consistent with a scenario of continuous injection of radiation from the `central engine' of the GRB to the fireball. Alternatively, this behaviour could result if ejecta are released with a range of Lorentz factors, with the slower shells catching up the faster at the afterglow shock position. The two scenarios are observationally indistinguishable.

The GRB 050401 afterglow is quite bright in the X-ray band, but weak in the optical, with an optical to X-ray flux ratio similar to those of `dark bursts'. We detect a significant amount of absorption in the X-ray spectrum, with NH= (1.7±0.2)x1022/cm2 at a redshift of z= 2.9, which is typical of a dense circumburst medium. Such high column density implies an unrealistic optical extinction of 30 mag if we adopt a Galactic extinction law, which would not be consistent with the optical detection of the afterglow. This suggests that the extinction law is different from the Galactic one.


Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS

Journal keyword(s): ISM: dust, extinction - gamma-rays: bursts

Simbad objects: 9

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Number of rows : 9
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 GRB 021004 gB 00 26 54.68 +18 55 41.6           ~ 560 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 650 1
4 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 883 1
5 GRB 980326 gB 08 36 34.3 -18 51 24           ~ 268 0
6 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1261 1
7 GRB 010222 G 14 52 12.5 +43 01 06           ~ 364 1
8 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 348 0
9 GRB 000203C gB ~ ~           ~ 3 0

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