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Astron. Astrophys. 335, L5-L8 (1998)

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4. Conclusions

We have detected the GRB 971214 near-IR counterpart [FORMULA] 3.5 hours and [FORMULA] 5 hours after the gamma-ray event which enables to conclude that:

i) a magnitude difference [FORMULA] is derived from our measurements, whereas [FORMULA] would be expected assuming a power-law decay with index [FORMULA] (similar to the one observed at optical wavelengths). This implies a deviation of [FORMULA]. If the assumed power-law index [FORMULA] were 1.4, then the rejection level would be [FORMULA]. Thus, our measurements suggest a rising or a flat light curve segment with a duration [FORMULA] hours (between 3.5 and 10.2 hours after the burst). This conclusion must be taken with care since the above-mentioned rejection levels are not stringent enough to assure the result with total confidence;

ii) the power-law decline in the near-IR should be steeper than the one given by [FORMULA] ;

iii) for the observations carried out on Dec 15.44-15.51, there is a change in the slope of the measured energy distribution at some wavelength between the J and [FORMULA] bands (possibly around H).

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© European Southern Observatory (ESO) 1998

Online publication: June 12, 1998