//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28110 SUBJECT: GRB 200715A : A long GRB detected by INTEGRAL DATE: 20/07/16 01:45:01 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), E.Bozzo, C.Ferrigno, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report: a gamma ray burst lasting about 160 s has been detected by IBAS in the IBIS/ISGRI data at 23:51:40 UT of July 15, 2020. The refined coordinates (J2000) are: R.A.= 248.5372 deg DEC.= -51.8392 deg with an uncertainty of 1.5 arcmin (90% c.l.). Due to telemetry saturation, we can provide only lower limits to its peak flux and fluence. The peak flux is greater than 1.2 ph/cm2/s (20-200 keV, 1-s integration time) and the fluence in the same energy range is greater than 1.8e-6 erg/cm2. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28111 SUBJECT: GRB 200715A: Swift ToO observations DATE: 20/07/16 01:48:23 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the INTEGRAL GRB 200715A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021018 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the INTEGRAL event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28115 SUBJECT: GRB 200715A: Swift-XRT afterglow detection DATE: 20/07/16 08:44:31 GMT FROM: Kim Page at U.of Leicester A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the INTEGRAL-detected burst GRB 200715A (Mereghetti et al. GCN Circ. 28110), collecting 3.3 ks of Photon Counting (PC) mode data between T0+7.5 ks and T0+26.2 ks. An uncatalogued X-ray source is detected consistent with being within 266 arcsec of the INTEGRAL position and is above the RASS limit, and is therefore likely the GRB afterglow. The position of this source is RA, Dec=248.5377, -51.8356 which is equivalent to: RA (J2000): 16:34:9.04 Dec(J2000): -51:50:08.0 with an uncertainty of 3.7 arcsec (radius, 90% confidence). This position is 13 arcsec from the INTEGRAL position (Mereghetti et al. GCN Circ. 28110). The light curve can be modelled with a power-law decay with a decay index of alpha=1.06 (+0.32, -0.27). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.1 (+/-0.5). The best-fitting absorption column is 1.06 (+0.60, -0.29) x 10^22 cm^-2, consistent with the Galactic value of 7.6 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.8 x 10^-11 (9.4 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.06 (+0.60, -0.29) x 10^22 cm^-2 Galactic foreground: 7.6 x 10^21 cm^-2 Excess significance: <1.6 sigma Photon index: 2.1 (+/-0.5) If the light curve continues to decay with a power-law decay index of 1.06, the count rate at T+24 hours will be 6.2 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.0 x 10^-13 (5.8 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00021018. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/00021018. This circular is an official product of the Swift-XRT team.