2001A&A...374..382M


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.29CET21:40:12

2001A&A...374..382M - Astronomy and Astrophysics, volume 374, 382-393 (2001/8-1)

GRB 010222: Afterglow emission from a rapidly decelerating shock.

MASETTI N., PALAZZI E., PIAN E., MANNUCCI F., ANTONELLI L.A., DI PAOLA A., SARACCO P., SAVAGLIO S., AMATI L., BARTOLINI C., BERNABEI S., BETTONI D., COVINO S., CRISTIANI S., DESIDERA S., DI SEREGO ALIGHIERI S., FALOMO R., FRONTERA F., GHINASSI F., GUARNIERI A., MAGAZZU A., MAIOLINO R., MIGNOLI M., NICASTRO L., PEDANI M., PICCIONI A., POGGIANTI B.M., TESTA V., VALENTINI G. and ZACCHEI A.

Abstract (from CDS):

The GRB010222 optical and near-infrared (NIR) afterglow was monitored at the TNG and other Italian telescopes starting ∼1 day after the high-energy prompt event. The BVR light curves, which are the best sampled, are continuously steepening and can be described by two power laws, f(t)∝t–α, of indices α1∼0.7 and α2∼1.3 before and after a break occurring at about 0.5 days after the GRB start time, respectively. This model accounts well also for the flux in the U, I and J bands, which are less well monitored. The temporal break appears to be achromatic. The two K-band points are not consistent with the above behaviour, and rather suggest a constant trend. A low-resolution optical spectrum has also been taken with TNG. In the optical spectrum we found three absorption systems at different redshifts (0.927, 1.155 and 1.475), the highest of which represents a lower limit to, and probably coincides with, the redshift of the GRB. The broad-band optical spectral energy distributions do not appear to vary with time, consistently with the achromatic behaviour of the light curves. We compare our measurements with different afterglow evolution scenarios and we find that they favor a transition from relativistic to non-relativistic conditions in the shock propagation.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - radiation mechanisms: non-thermal - line: identification - cosmology: observations

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 GRB 991216 gB 05 09 31.2983 +11 17 07.262           ~ 409 1
2 GRB 990705 gB 05 09 54.5 -72 07 53           ~ 215 1
3 GRB 971214 gB 11 56 26.4 +65 12 01           ~ 434 1
4 GRB 990510 gB 13 38 07.64 -80 29 48.8           ~ 467 1
5 GRB 010222 gB 14 52 12.55 +43 01 06.3           ~ 336 2
6 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 964 1
7 GRB 000301C gB 16 20 18.5 +29 26 35           ~ 341 2
8 GRB 991208 gB 16 33 53.51 +46 27 21.5           ~ 244 1
9 GRB 000926 gB 17 04 15 +51 46.0           ~ 342 2
10 GRB 980519 gB 23 22 21.5 +77 15 43           ~ 194 0

    Equat.    Gal    SGal    Ecl

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2020.11.29-21:40:12

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