TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3446 SUBJECT: XRF 050522 detected with INTEGRAL DATE: 05/05/22 06:54:59 GMT FROM: Diego Gotz at IASF-CNR D. Gotz, S. Mereghetti (IASF, Milano), N. Mowlavi, S. Shaw, M. Beck (ISDC, Versoix) and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A 15 s long GRB has been detected by IBAS in IBIS/ISGRI data in the 15-40 keV band at 06:00:21 on May 22 2005. It is not detected above 40 keV, which classifies it as an XRF. Its refined coordinates (J2000) are: RA: 200.1468 [degrees] DEC: +24.7916 [degrees] with an uncertainty of 2.5 arcmin (90% c.l. radius). Its preliminary peak flux (20-200 keV, 1s integration time) is about 0.34 ph (2.2E-08 erg)/cmsq/s. Its fluence (20-200 keV, 80 s integration time) is 1.7 ph (9E-08 erg)/cmsq. A plot of the double peaked light curve will be posted at http://ibas.mi.iasf.cnr.it/IBAS_Results.html Note that this burst is located at high galactic latitude (b=+83 deg) and not affected by Galactic absorption. It is therefore a good target for optical follow-up searches. This message can be cited.