//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8281 SUBJECT: GRB080922: A long GRB detected by INTEGRAL DATE: 08/09/22 12:15:38 GMT FROM: Sandro Mereghetti at IASF/CNR S.Mereghetti, A.Paizis (IASF-Milano), D.Gotz (CEA-Saclay), W. Ishibashi, V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A GRB lasting about 60 s has been detected by IBAS in IBIS/ISGRI data at 11:03:36 UT of September 22. The coordinates (J2000) are: RA: 270.838 [degrees] DEC: -22.509 [degrees] with an uncertainty of 2 arcmin (90% c.l.). A preliminary analysis gives a peak flux in the 20-200 keV range of about 1 ph/cmq/s (1-s integration time) and a fluence over the same energy range of about 1.5x10e-6 erg/cmq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8282 SUBJECT: GRB080922: Swift-XRT upper limit DATE: 08/09/23 07:16:06 GMT FROM: Valentina La Parola at INAF-IASPA B. Sbarufatti, V. La Parola, V. Mangano (INAF-IASFPa), on behalf of the Swift-XRT team At 2008-09-22 14:54UT Swift performed a TOO observation of the INTEGRAL burst GRB 080922 (Mereghetti et al., GCN Circ. 8281), 3h52m after the INTEGRAL trigger. No X-ray source was found in or near the IBAS error circle in a 5.9ks exposure Swift/XRT Photon Counting mode image down to a 3 sigma limiting 0.3-10keV count rate of 4.3e-3 count/s. Assuming a power-law spectrum of photon index 2 absorbed by the Galactic column density of 1.14e22 cm-2 in the direction of the burst, this corresponds to an observed 0.3-10keV flux limit of 2.55e-13 erg cm-2 s-1. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8283 SUBJECT: GRB 080922: Swift/UVOT Upper Limits DATE: 08/09/23 14:52:56 GMT FROM: Stephen Holland at USRA/NASA/GSFC/SSC S. T. Holland (CRESST/GSFC/USRA) and B. Sbarufatti (INAF-IASFPa) report on the behalf of the Swift UVOT team: The Swift/UVOT observed the field of GRB 080922 starting 13,904 s (= 3.84 hr) after the INTEGRAL detection (Mereghetti et al. 2008, GCN Circ. 8281). We do not find any new source, relative to the DSS or 2MASS, or any variable source inside the INTEGRAL/IBAS error circle. The 3-sigma upper limits for detecting a source in the co-added images, using a 2.5 arcsecond radius circular aperture, are: Filter T_start T_stop Exp(s) Mag ----------------------------------------- v 15,622 15,834 208 >18.9 b 14,550 26,731 625 >20.6 u 14,333 31,298 834 >20.3 uvw1 13,904 30,081 1668 >20.5 uvm2 15,839 15,853 14 >16.1 uvw2 14,769 27,419 2341 >20.8 ----------------------------------------- The quoted upper limits have not been corrected for the expected, and highly uncertain, Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 20 mag (Schlegel, et al., 1998, ApJS, 500, 525). All photometry is on the UVOT flight system described in Poole et al. (2008, MNRAS, 383, 627). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8289 SUBJECT: GRB080922, optical upper limit DATE: 08/09/25 08:27:02 GMT FROM: Ryuuji Hara at U of Miyazaki R. Hara, H.hayasi, N.Ohmori, K.Kono H. Tanaka, M.Yamauchi, E.Sonoda, (University of Miyazaki) We have observed the field covering the error circle of GRB080922 (GCN 8281, S.Mereghetti et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 11:14:04 UT, 11.7min after the INTEGRAL trigger time. We have compared our data of 30 sec exposures with the USNO-A2.0 catalog,there is no new source at the reported position. the upper limits are as follows: -------------------------------------------------------------- Start(UT) End(UT) Num. of frames Limit (mag.) -------------------------------------------------------------- 11:15:19 11:15:49 1 16.7 11:15:19 11:41:35 20 17.1 --------------------------------------------------------------- -- ---------------------------------------- 宮崎大学大学院 応用物理学専攻 修士課程 2年 原 龍児 ryuu55@astro.miyazaki-u.ac.jp ----------------------------------------