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GCN Circular 173

Subject
GRB 981226 - Infrared Observations
Date
1998-12-28T03:58:18Z (25 years ago)
From
Alberto Castro-Tirado at LAEFF-INTA <ajct@laeff.esa.es>
GRB 981226
 
A. J. Castro-Tirado and J. Gorosabel, Laboratorio de Astrofisica Espacial y
   Fisica Fundamental, Madrid
N. Drory and B. Konig, Universitaetssternwarte, Munich
V. Motta, Univ. de la Republica, Montevideo
N. Gonzalez, Instituto de Astrofisica de Canarias, Tenerife
J. Aceituno, Calar Alto Observatory, Almeria
J. Greiner, Astrophysikalisches Institut, Potsdam
F. Frontera and E. Palazzi, Istituto di Astrofisica Spaziale, Frascati
   (on behalf of the BeppoSAX team)

We have obtained J-band images at the 3.5-m telescope (equipped with Omega)
at the German-Spanish Calar Alto Observatory, on Dec 26.76 (300-s) and Dec
27.76 (1700-s). Within the BeppoSAX position for the X-ray source in the
GRB 981226 error box (di Ciola et al. IAU Circ. 7074), we find a variable
object with J = 19.4 (Dec 26.76) and J = 20.5 (Dec 27.76). These values are
still preliminary. The position is RA(2000) = 23 29 35.0, Dec(2000) =
-23 55 42 (+/- 3"). The object reported by Galama et al. (GCN Circ. 172)
does not exhibit any variability larger than 0.1 mag. Further observations
are encouraged in order to confirm whether the above-mentioned object is 
the counterpart to GRB 981226.
 
A finding chart can be retrieved via anonymous ftp to laeff.esa.es
(under /pub/users/ajct/grb981226).

This report is quotable in any publication.
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