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SN 2003lw and GRB 031203: A Bright Supernova for a Faint Gamma-Ray Burst

D. MalesaniInternational School for Advanced Studies (SISSA-ISAS), via Beirut 2-4, I-34014 Trieste, ItalyG. TagliaferriINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyG. ChincariniINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyS. CovinoINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyM. Della ValleINAF-Osservatorio Astronomico di Arcetri, Largo E. Fermi 5, I-50125 Florence, ItalyD. FugazzaINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyP. A. MazzaliThe University of TokyoF. M. ZerbiINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyP. D’AvanzoINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyS. KalogerakosINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyA. SimoncelliINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyL. A. AntonelliINAF-Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio Catone (Rome), ItalyL. BurderiINAF-Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio Catone (Rome), ItalyS. CampanaINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyAntonino CucchiaraINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyF. FioreINAF-Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio Catone (Rome), ItalyG. GhirlandaINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyP. GoldoniCEA Saclay, DSM/DAPNIA/Service d’Astrophysique, F-91191, Gif sur Yvette, FranceD. GötzIstituto di Astrofisica Spaziale e Fisica Cosmica/CNR, Sezione di Milano, via Bassini 15, I-20133 Milan, ItalyS. MereghettiIstituto di Astrofisica Spaziale e Fisica Cosmica/CNR, Sezione di Milano, via Bassini 15, I-20133 Milan, ItalyI. F. MirabelCEA Saclay, DSM/DAPNIA/Service d’Astrophysique, F-91191, Gif sur Yvette, FranceP. RomanoINAF-Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Lc), ItalyL. StellaINAF-Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio Catone (Rome), ItalyTakeo MinezakiInstitute of Astronomy, School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, JapanYuzuru YoshiiInstitute of Astronomy, School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, JapanKen’ichi NomotoDepartment of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

2004en

ABI

Annotatsiya

Optical and near-infrared observations of the gamma-ray burst GRB 031203, at z = 0.1055, are reported. A very faint afterglow is detected superposed onto the host galaxy in our first infrared JHK observations, carried out ~9 hr after the burst. Subsequently, a rebrightening is detected in all bands, peaking in the R band about 18 rest-frame days after the burst. The rebrightening closely resembles the light curve of a supernova like SN 1998bw, assuming that the GRB and the SN went off almost simultaneously, but with a somewhat slower evolution. Spectra taken close to the maximum of the rebrightening show extremely broad features as in SN 1998bw. The determination of the absolute magnitude of this SN (SN 2003lw) is difficult owing to the large and uncertain extinction, but likely this event was brighter than SN 1998bw by 0.5 mag in the VRI bands, reaching an absolute magnitude MV = -19.75 ± 0.15.

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DOI: 10.1086/422684

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