Astron. Astrophys. 335, L5-L8 (1998)
4. Conclusions
We have detected the GRB 971214 near-IR counterpart
3.5 hours and 5 hours
after the gamma-ray event which enables to conclude that:
i) a magnitude difference is derived from
our measurements, whereas would be expected
assuming a power-law decay with index (similar
to the one observed at optical wavelengths). This implies a deviation
of . If the assumed power-law index
were 1.4, then the rejection level would be
. Thus, our measurements suggest a rising or a
flat light curve segment with a duration 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 ;
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 bands (possibly
around H).
© European Southern Observatory (ESO) 1998
Online publication: June 12, 1998
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