TITLE: GCN GRB OBSERVATION REPORT NUMBER: 288 SUBJECT: IPN localization of GRB990427 DATE: 99/04/28 21:59:44 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the Ulysses GRB Team, and T. Cline, on behalf of the KONUS-WIND and NEAR GRB teams, report: An intense, 200 s long burst was observed by Ulysses, KONUS, and NEAR on 27 April 1999 at 56685 s. Preliminary triangulation gives an ~ 70 sq. arcmin. error box whose corners are: RA(2000) DEC(2000) 23 h 31 m 07.12 s -18 o -39' -43" 23 h 31 m 37.54 s -18 o -31' -39" 23 h 30 m 16.68 s -18 o -43' -23" 23 h 30 m 47.18 s -18 o -35' -23" This error box can be refined.