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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2346 SUBJECT: Re: XRF 030723: Detection of a rebrightening in the optical afterglow DATE: 03/08/06 18:54:15 GMT FROM: Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov> On Wed, 6 Aug 2003, GCN Circulars wrote: > TITLE: GCN GRB OBSERVATION REPORT > NUMBER: 2345 > SUBJECT: XRF 030723: Detection of a rebrightening in the optical afterglow > DATE: 03/08/06 18:38:00 GMT > FROM: Jens Hjorth at U.Copenhagen <jens@astro.ku.dk> > > J. P. U. Fynbo (U. Aarhus), J. Hjorth (U. Copenhagen), J. Gorosabel > (IAA-CSIC/STScI), B. L. Jensen (U. Copenhagen), M. I. Andersen (AIP), > R. A. M. J. Wijers (U. Amsterdam), C. Kouveliotou (NASA/MSFC), on behalf > of GRACE, report: > > "We have monitored the afterglow of XRF 030723 (Prigozhin et al. GCN #2313; > Fox et al. GCN #2323; Butler et al. GCN #2328) with the ESO VLT. Between > Aug 3.2 UT and Aug 6.3 2003 UT the optical afterglow brightened by 1.0 mag > to R ~ 24.3. If this is due to the emergence of a supernova it would > strengthen the link between GRBs and XRFs. It would also indicate a fast rise > for the supernova and a relatively low redshift for XRF 030723, z < 1, > consistent with the earlier spectroscopic constraints (Fynbo et al. > GCN #2327). Alternatively, we may be seeing a rebrightening due to late > energy injection (refreshed shock). Continued spectroscopic and photometric > monitoring is planned. > > Images are posted at http://www.astro.ku.dk/~brian_j/grb/grb030723 > > We thank the Paranal Observatory staff for efficiently conducting the > reported service-mode observations." > --
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