//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 21390 SUBJECT: IBAS weak Alert nr.7881: possible GRB 170730A DATE: 17/07/30 07:45:59 GMT FROM: Diego Gotz at CEA D.Gotz (CEA Saclay) on behalf of the IBAS Localization Team reports: the weak IBAS Alert nr. 7881 corresponds to a weak transient source lasting about 100 s, starting at 00:09:32 UT on July 30th 2017, localized at R.A: 245.3407 deg Dec: -60.8832 deg with an unceratinty of 2.5 arc min (90% c.l.). We prliminarly classify it as a GRB, but we cannot exclude that it is a new Galactic source due to its low Galactic latitude. Futher analysis is on-going. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 21392 SUBJECT: GRB170730A detecetd by INTEGRAL. Refined analysis DATE: 17/07/30 14:19:45 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: further analysis of the possible GRB 170730A detected as a subtrheshold alert by IBAS in the IBIS/ISGRI data at 00:09:20 UT of July 30, 2017 (Gotz et al. GCN 21390) yields the refined coordinates (J2000): R.A.= 245.2996 deg DEC.= -60.8866 deg with an uncertainty of 2 arcmin (90% c.l.). The burst lasted about 500 s, with a peak flux of about 0.6 photons/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 1e-6 erg/cmq. The time averaged spectrum is consistent with a power law with photon index ~2 A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html