Follow-Up Observations of SN1999GI in NGC 3184

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Chandra Proposal Id #01508000

Scientific paper

Type II supernovae may all be X-ray sources but differences in behavior are becoming visible: normal SN II's fade quickly while the abnormal SN IIn's last for months, perhaps years. These suppositions are based upon very limited statistics: 2 normal SN II's and about 4-6 SN IIn's. The turn-on times are unknown, as are the half-lives. Two normal SN II's observed in the X-ray band are SN1980K (Canizares et al. 1982) and SN1999em (Fox & Lewin 1999, IAU Circ 7318). The turn-on time of these SNe appear to be nearly immediate. Radio and X-ray emission should be correlated, yet are not: SN1980K was an early radio source; SN1999em has not yet been detected. But a correlation with radio emission must be suspect with so little data. SN1999gi,the target of this TOO, represents a potential third norm

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