//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 17476 SUBJECT: GRB 150219A: A long GRB detected by INTEGRAL DATE: 15/02/19 13:30:46 GMT FROM: Sandro Mereghetti at IASF/CNR S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: a gamma ray burst lasting about 60 s has been detected by IBAS in the IBIS/ISGRI data at 12:31:14 UT of February 19 The refined coordinates (J2000) are: R.A.= 271.2664 deg DEC.= -41.5849 deg with an uncertainty of 2 arcmin (90% c.l.). The burst had a peak flux of 1.4 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 4e-6 erg/cmq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 17477 SUBJECT: GRB 150219A: Swift ToO observations DATE: 15/02/19 15:04:27 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 150219A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020483 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: 17480 SUBJECT: GRB 150219A: Swift-XRT afterglow detection DATE: 15/02/19 23:34:23 GMT FROM: Valerio D'Elia at ASDC K.L. Page (U. Leicester), C. Pagani (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A.P. Beardmore (U. Leicester) 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 150219A (Mereghetti et al. GCN Circ. 17476), collecting 2.6 ks of Photon Counting (PC) mode data between T0+10.5 ks and T0+23.4 ks. An uncatalogued X-ray source is detected inside the INTEGRAL error region and is fading with 3-sigma significance, and is therefore likely the GRB afterglow. The position of this source is RA, Dec=271.2507, -41.5942 which is equivalent to: RA (J2000): 18:05:0.18 Dec(J2000): -41:35:39.0 with an uncertainty of 3.7 arcsec (radius, 90% confidence). This position is 53 arcsec from the INTEGRAL position. The light curve can be modelled with a power-law decay with a decay index of alpha=2.8 (+0.9, -0.7). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.8 (+/-0.4). The best-fitting absorption column is 1.6 (+0.6, -0.5) x 10^22 cm^-2, in excess of the Galactic value of 1.4 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 6.3 x 10^-11 (1.1 x 10^-10) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.6 (+0.6, -0.5) x 10^22 cm^-2 Galactic foreground: 1.4 x 10^21 cm^-2 Excess significance: 4.6 sigma Photon index: 1.8 (+/-0.4) If the light curve continues to decay with a power-law decay index of 2.8, the count rate at T+24 hours will be 5.8 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.6 x 10^-14 (6.2 x 10^-14) erg cm^-2 s^-1. The results of the XRT-team automatic analysis of the likely afterglow are at http://www.swift.ac.uk/ToO_GRBs/00020483/index_1.php. The results of the full analysis of the XRT observations are available at http://www.swift.ac.uk/ToO_GRBs/00020483. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 17481 SUBJECT: GRB 150219A: Fermi GBM observation DATE: 15/02/20 10:02:13 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 12:31:12.26 UT on 19 February 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150219A (trigger 446041875 / 150219522), which was also detected by INTEGRAL/IBIS (Mereghetti et al. 2015, GCN 17476). The GBM on-ground location is consistent with the INTEGRAL position. The angle from the Fermi LAT boresight is 105 degrees. The GBM light curve shows a structured pulse with a duration (T90) of about 36 s (50-300 keV). The time-averaged spectrum from T0-2.304 s to T0+38.657 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.92 (+0.08/-0.07) and the cutoff energy, parameterized as Epeak, is 202.7(+23.2/-19.1) keV. The event fluence (10-1000 keV) in this time interval is (1.00 +/- 0.05)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+9.664 s in the 10-1000 keV band is 4.2 +/- 0.3 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 166.7(+24.3/-17.3) keV, alpha = -0.82 +/- 0.10 and beta = -2.17 (+0.13/-0.24). The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."