TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  459
SUBJECT: GRB991208 - millimeter detection
DATE:    99/12/15 00:18:32 GMT
FROM:    Frank Bertoldi at MPIFR/Bonn  <bertoldi@mpifr-bonn.mpg.de>

Michael Bremer (IRAM Grenoble), Frank Bertoldi (MPIfR Bonn), 
Ute Lisenfeld (IRAM Granada), Alberto Castro-Tirado (LAEFF-INTA Madrid and 
IAA-CSIC Granada), Titus Galama (Caltech, Pasadena), 
and Ernst Kreysa (MPIfR) report: 
 
The afterglow of GRB 991208 was detected at 240 GHz with the Max-Planck
Millimeter Bolometer (MAMBO) array (80 GHz bandwidth, 10.7 arcsec HPBW) at
the IRAM 30 m telescope on Pico Veleta, at the position reported by Frail
et al. (GCN 451). Three on-off integrations yield the following flux
densities:

 UT December 11.77, 1999        2.6 +/- 0.8 mJy
 UT December 12.38, 1999        1.9 +/- 0.6 mJy
 UT December 14.35, 1999        2.2 +/- 0.7 mJy
 
Combining all data we obtain a flux density  2.4 +/- 0.5 mJy. The source 
intensity appears to remain nearly constant. We will continue to monitor
its flux.