An unusual supernova in the error box of the gamma-ray burst of 25 April 1998

Article Abstract:

A transient optical emission in the error box of the gamma-ray burst GRB980425 was discovered, with a light curve very different to that of previous optical afterglows linked to gamma-ray bursts. Its optical spectra and location suggest that it is a luminous supernova identified as SN1998bw, and if linked to GRB980425, the energy radiated in gamma-rays is about four orders of magnitudes less than other gamma-ray bursts.

Author: Suzuki, T., Hainaut, O.R., Lidman, C., Hurley, K., Peterson, B.A., Nakamura, T., Tanvir, N., Nomoto, K., Pian, E., Masetti, N., Palazzi, E., Patat, F., Frontera, F., Greiner, J., Augusteijn, T., Nicastro, L., Groot, P.J., van Paradijs, J., Strom, R.G., Heise, J., Costa, E., Feroci, M., Piro, L., Iwamoto, K., Galama, T.J., Vreeswilk, P.M., Kouvelioutou, C., Bohnhardt, H., Brewer, J.P., Doublier, V., Gonzalez, J.F., Leibundgut, B., in'tZand, J., Mazzali, P.A, Umeda, H., Shigeyama, T., Koshut, T., Kippen, M., Robinson, C., de Wildt, P., Wiljers, R.A.M.J., Tinney, C., Boyle, B., Cannon, R., Stathakis, R., Sadler, E., Begam, M.C., Ianna, P.

Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998

Observations, Supernovae, Supernovas, Gamma rays

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Charon's size and an upper limit on its atmosphere from a stellar occultation

Article Abstract:

Observations from a multi-station stellar occultation by Pluto's satellite Charon which is used to derive a radius, Rc=603.6(plusmn)1.4 km (1 sigma), and a density of rho = 1.71(plusmn 0.08) g cm(super -3) is reported. This occultation also provides upper limits of 110 and 15 nanobar for an atmosphere around Charon, assuming respectively a pure nitrogen or pure methane atmosphere.

Author: Lellouch, E., Sicardy, B., Widemann, T., Colas, F., Roques, F., Beisker, W., Lecacheux, J., Renner, S., Bellucci, A., Gendron, E. Lacombe, F., Lacour, S., Pau, S., Vachier, F., Martins, R. Vieira, Ageorges, N., Hainaut, O., Marco, O., Gaillard, B, Lavayssiere, M., Sora, M. Di, Mallia, F., Masi, G., Behrend, R., Carrier, F, Mousis, O., Rousselot, P., Alvarez-Candal, A., Lazzaro, D., Veiga, C., Andrei, A.H., Assafin, M., Neto, D.N. da Silva, Jacques, C., Pimentel, E., Weaver, D., Lecampion, J.-F., Doncel, F., Momiyama, T., Tancredi, G.

Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006

France, Science & research, Environmental aspects, Occultations, Occultations (Astronomy), Dynamo theory (Cosmic physics), Astronomical dynamos, Charon (Satellite)

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Abstracts

Zoology and wildlife conservation

An unusual supernova in the error box of the gamma-ray burst of 25 April 1998

Charon's size and an upper limit on its atmosphere from a stellar occultation