===== BEGIN MESSAGE ===== From aavso-hen-bounces@aavso.org Wed Dec 30 08:01:30 2009 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on mira.aavso.org X-Spam-Level: X-Spam-Status: No, score=-1.4 required=2.5 tests=ALL_TRUSTED autolearn=disabled version=3.2.5 Received: from mira.aavso.org (localhost.localdomain [127.0.0.1]) by mira.aavso.org (8.14.3/8.14.3) with ESMTP id nBUD1NEx002886; Wed, 30 Dec 2009 08:01:24 -0500 Received: from mira.aavso.org (localhost.localdomain [127.0.0.1]) by mira.aavso.org (8.14.3/8.14.3) with ESMTP id nBUD1Mf8002882 for ; Wed, 30 Dec 2009 08:01:22 -0500 Received: (from grb@localhost) by mira.aavso.org (8.14.3/8.14.3/Submit) id nBUD1MO2002881; Wed, 30 Dec 2009 08:01:22 -0500 Date: Wed, 30 Dec 2009 08:01:22 -0500 Message-Id: <200912301301.nBUD1MO2002881@mira.aavso.org> To: aavso-hen@aavso.org From: grb@aavso.org Subject: [AAVSO-HEN] GRB 091230: GROND optical/NIR afterglow candidate X-BeenThere: aavso-hen@aavso.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============7639836037503442066==" Sender: aavso-hen-bounces@aavso.org Errors-To: aavso-hen-bounces@aavso.org --===============7639836037503442066== Content-Type: text/plain The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 10299 SUBJECT: GRB 091230: GROND optical/NIR afterglow candidate DATE: 09/12/30 13:00:36 GMT FROM: Thomas Kruehler at MPE/MPI R. Filgas, T. Kruehler and J. Greiner (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 091230 (INTEGRAL trigger #5967, D. Gotz et al., GCN #10298) simultaneously in g'r'i'z'JHK with GROND mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile). Observations started on 30 Dec. 2009 at 06:30:27 UT, 2.9 min after the burst. Image subtraction reveals a variable point source inside the INTEGRAL error circle (D. Gotz et al., GCN #10298) at RA (J2000.0) = 08:51:39.18 DEC (J2000.0) = -53:53:52.7 with an uncertainty of 0.5" in each coordinate. This is 56" from the refined INTEGRAL position. Preliminary photometry yields the following magnitudes in stacked images: Filter T_mid[s] Exp[s] AB Mag MagErr --------------------------------------- g' 390 4x 66 21.63 0.07 r' 390 4x 66 20.76 0.04 i' 390 4x 66 20.45 0.05 z' 390 4x 66 20.22 0.05 J 403 24x 10 19.75 0.12 H 403 24x 10 19.58 0.14 K 403 24x 10 19.26 0.15 The quoted error is statistical only. There is an additional systematic error in the absolute calibration using the GROND zeropoints and 2MASS field stars which is expected to be in the 0.1 to 0.2 mag range. The object fades by two magnitudes to r' = 22.8 ± 0.1 until the end of our optical observations two hours after the trigger - thus we propose this object as the optical/NIR afterglow of GRB 091230. --===============7639836037503442066== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Aavso-hen mailing list Aavso-hen@aavso.org To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen The Santa Barbara Instrument Group (www.sbig.com): Take the next step. SGS, the self-guiding spectrograph. --===============7639836037503442066==-- ===== END MESSAGE ===== ===== BEGIN MESSAGE ===== From aavso-hen-bounces@aavso.org Wed Dec 30 20:46:36 2009 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on mira.aavso.org X-Spam-Level: X-Spam-Status: No, score=-1.4 required=2.5 tests=ALL_TRUSTED autolearn=disabled version=3.2.5 Received: from mira.aavso.org (localhost.localdomain [127.0.0.1]) by mira.aavso.org (8.14.3/8.14.3) with ESMTP id nBV1kVpa013614; Wed, 30 Dec 2009 20:46:32 -0500 Received: from mira.aavso.org (localhost.localdomain [127.0.0.1]) by mira.aavso.org (8.14.3/8.14.3) with ESMTP id nBV1kUCT013610 for ; Wed, 30 Dec 2009 20:46:30 -0500 Received: (from grb@localhost) by mira.aavso.org (8.14.3/8.14.3/Submit) id nBV1kTXb013607; Wed, 30 Dec 2009 20:46:29 -0500 Date: Wed, 30 Dec 2009 20:46:29 -0500 Message-Id: <200912310146.nBV1kTXb013607@mira.aavso.org> To: aavso-hen@aavso.org From: grb@aavso.org Subject: [AAVSO-HEN] GRB 091230: Swift-XRT observation X-BeenThere: aavso-hen@aavso.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: aavso-hen-bounces@aavso.org Errors-To: aavso-hen-bounces@aavso.org The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 10300 SUBJECT: GRB 091230: Swift-XRT observation DATE: 09/12/31 01:45:38 GMT FROM: Andy Beardmore at U Leicester A. P. Beardmore (U. Leicester) and H. A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift-XRT team: At 2009-12-30 15:25UT Swift performed a TOO observation of the INTEGRAL discovered long GRB 091230 (Gotz et al., GCN Circ. 10298). In 3.7 ks of XRT Photon Counting (PC) mode data, taken from 32.3 ks to 39.4 ks after the INTEGRAL trigger, we find an X-ray source within the INTEGRAL error circle, with a 0.3-10 keV count rate of 0.01 count/s. Using 1096 s of PC mode data and 1 UVOT image, the enhanced XRT position for this source (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue, as described by Goad et al., 2007, A&A, 476, 1401 and Evans et al., 2009, MNRAS, 397, 1177) is: RA, Dec = 132.91150, -53.89780, which is equivalent to: RA (J2000): 08 51 38.77 Dec(J2000): -53 53 52.0 with an uncertainty of 2.7 arcsec (radius, 90% confidence). This position lies 3.8 arcsec from the location of the Grond optical/NIR afterglow candidate (Filgas et al., GCN Circ. 10299). At this stage, we cannot tell whether the X-ray source is fading, but its coincidence with the Grond candidate suggests it is likely the X-ray counterpart to GRB 091230. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020124. This circular is an official product of the Swift-XRT team. _______________________________________________ Aavso-hen mailing list Aavso-hen@aavso.org To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen The Santa Barbara Instrument Group (www.sbig.com): Take the next step. SGS, the self-guiding spectrograph. ===== END MESSAGE ===== ===== BEGIN MESSAGE ===== From aavso-hen-bounces@aavso.org Thu Dec 31 13:51:43 2009 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on mira.aavso.org X-Spam-Level: X-Spam-Status: No, score=-1.4 required=2.5 tests=ALL_TRUSTED autolearn=disabled version=3.2.5 Received: from mira.aavso.org (localhost.localdomain [127.0.0.1]) by mira.aavso.org (8.14.3/8.14.3) with ESMTP id nBVIpe4Q001747; Thu, 31 Dec 2009 13:51:40 -0500 Received: from mira.aavso.org (localhost.localdomain [127.0.0.1]) by mira.aavso.org (8.14.3/8.14.3) with ESMTP id nBVIpcQ3001743 for ; Thu, 31 Dec 2009 13:51:38 -0500 Received: (from grb@localhost) by mira.aavso.org (8.14.3/8.14.3/Submit) id nBVIpcWY001740; Thu, 31 Dec 2009 13:51:38 -0500 Date: Thu, 31 Dec 2009 13:51:38 -0500 Message-Id: <200912311851.nBVIpcWY001740@mira.aavso.org> To: aavso-hen@aavso.org From: grb@aavso.org Subject: [AAVSO-HEN] GRB 091230: Swift/UVOT Observations X-BeenThere: aavso-hen@aavso.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: AAVSO High Energy Network List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: aavso-hen-bounces@aavso.org Errors-To: aavso-hen-bounces@aavso.org The following is a GCN Circular circulated via the AAVSO network. For an archive and more information on circulars visit: http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html TITLE: GCN CIRCULAR NUMBER: 10302 SUBJECT: GRB 091230: Swift/UVOT Observations DATE: 09/12/31 18:50:34 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and H. A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 091230 32291 s after the Integral detection (Gotz et al., GCN Circ. 10298). We do not detect the afterglow reported by GROND (Filgas et al., GCN Circ. 10299) and Swift-XRT (Beardmore et al., GCN Cic. 10300). Preliminary 3-sigma upper limits are: FILTER T_start(s) T_stop Exposure Mag/3UL ============================================================= white 32291 42824 3898 >22.2 The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.36 (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627). _______________________________________________ Aavso-hen mailing list Aavso-hen@aavso.org To change options or unsubscribe, goto http://www.aavso.org/mailman/listinfo/aavso-hen The Santa Barbara Instrument Group (www.sbig.com): Take the next step. SGS, the self-guiding spectrograph. ===== END MESSAGE =====