TITLE: GCN CIRCULAR NUMBER: 5684 SUBJECT: IPN triangulation of GRB060928 (long, exceptionally bright) DATE: 06/10/03 00:09:40 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Ulysses and Konus GRB teams, S. Golenetskii, E. Mazets, V. Pal'shin, and D. Frederiks on behalf of the Konus-Wind team, D. M. Smith, R. P. Lin, J. McTiernan, E. Bellm, R. Schwartz, C. Wigger, W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team, A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS GRB team, K.Yamaoka, M.Ohno, Y.Fukazawa, T.Takahashi, M.Tashiro, Y. Terada, T.Murakami, and K.Makishima on behalf of the Suzaku WAM team, and S. Barthelmy, J. Cummings, D. Palmer, N. Gehrels, and H. Krimm, on behalf of the Swift-BAT team, Ulysses, Konus-Wind, RHESSI, INTEGRAL (SPI-ACS), Suzaku (WAM), and Swift (BAT) observed this hard-spectrum GRB starting around 04621 seconds. It had a duration of about 215 s in two distinct episodes, and a fluence of about 3 x 10^-4 erg/cm^2. We have triangulated it to a preliminary ~855 sq. arcmin. error box (3 sigma), whose coordinates are: Center: 127.639, -42.210 Corners: 127.490, -42.705 127.737, -43.008 127.555, -41.399 127.774, -41.726 This error box may be improved. It was outside the Swift BAT field of view for both episodes, and therefore Swift did not image the burst, although it did detect it. However, in the course of a later, preplanned observation beginning at T+10 minutes, BAT imaged a weak source within the IPN error box, at RA, Dec= 127.630, -42.696, which could be the gamma-ray afterglow. A ToO observation of this source has been requested. Further details of the energy spectrum will be given in a forthcoming GCN.