//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7046 SUBJECT: GRB 071109: A long GRB detected by INTEGRAL DATE: 07/11/09 21:41:34 GMT FROM: Volker Beckmann at ISDC S. Mereghetti (IASF-Milano), V. Beckmann, I. Kreykenbohm, M. Beck (ISDC, Versoix), A. Paizis (IASF-Milano), D. Gotz (CEA-Saclay), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A GRB lasting about 30s has been detected by IBAS in IBIS/ISGRI data on November 9 at 20:36:05 UT. The coordinates (J2000) are: RA: 289.913 [degrees] DEC: +2.048 [degrees] with an uncertainty of 2.5 arcmin. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7048 SUBJECT: GRB 071109: IBIS refined analysis DATE: 07/11/10 00:45:13 GMT FROM: Diego Gotz at IASF-CNR D. Gotz (CEA-Saclay) on behalf of the IBAS Localization Team reports: Further analysis of the INTEGRAL GRB 071109 (Mereghetti et al., GCN 7046) using IBIS/ISGRI data yielded the following results. The peak flux of the burst integrated over 1 s in the 20-200 keV energy range is 0.46 photons (3.6E-8 ergs)/cmsq/s. The fluence in the same band, integrated over 30 s, is 6.6E-7 ergs/cmsq. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7049 SUBJECT: VLA prompt radio detection of the INTEGRAL burst 071109 DATE: 07/11/10 03:10:43 GMT FROM: Poonam Chandra at U Virginia/NRAO P. Chandra (UVA/NRAO) and D. A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We observed the INTEGRAL error circle of the INTEGRAL burst GRB 071109 (GCN 7046) using the VLA at a frequency of 8.46 GHz. The observations were taken at 0.0 UT on 2007, November 10th, 3.4 hours after the burst. We detect radio afterglow of GRB 071109 within the INTEGRAL error circle. The flux density in 23 min long observation is 188+/-42 uJy at the following position: RA(J2000) 19 19 51.67 Dec(J2000) +02 01 49.88 The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7050 SUBJECT: GRB 071109: Swift-XRT possible X-ray counterpart DATE: 07/11/10 03:38:54 GMT FROM: Matteo Perri at ISAC/ASDC M. Perri, G. Stratta (ASDC) and D.N. Burrows (PSU) report on behalf of the Swift-XRT team: Swift-XRT began observing the field of view of the INTEGRAL-detected long burst GRB 071109 (Mereghetti et al., GCN Circ. 7046) at 22:21:50 UT on 2007 November 9, ~1.7 hours after the INTEGRAL trigger. We currently have 4.8 ks of XRT data, in which we detect a faint, uncatalogued X-ray source at a position of RA,Dec(J2000)= 289.974583,+2.046528 degrees, which is equivalent to: RA (J2000 = 19h 19m 53.9s Dec(J2000) = +02d 02' 47.5" with an estimated uncertainty of 9 arcsec (radius, 90% confidence). This is 3.7 arcmin from the INTEGRAL position (Mereghetti et al., GCN Circ. 7046), outside its error circle. We note also that this position is 1.1 arcmin away from the VLA radio source reported in GCN Circ. 7049 (Chandra & Frail). The source has a count rate of (2.5 +/-0.9)e-3 counts s-1. At present we are unable to determine whether the source is fading, however observations are ongoing and further analysis of these XRT data will be reported in a subsequent circular. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7052 SUBJECT: GRB 071109: TAROT Calern observatory optical observations DATE: 07/11/10 16:07:00 GMT FROM: Alain Klotz at CESR-CNRS Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 071109 detected by INTEGRAL (trigger 4761) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 36s after the GRB trigger (8s after the notice). The elevation of the field decreased from from 12 degrees above horizon and weather conditions were good. We analyzed carefully the following zones: Mereghetti et al. 2007 (GCNC 7046): Center 19h19m39.12m +02°02'52.8" radius=2.5 arcmin Chandra & Frail 2007 (GCNC 7049): Center 19h19m51.67m +02°01'49.9" radius=15 arcsec Perri, Stratta et al. 2007 (GCNC 7050): Center 19h19m53.9m +02°02'47.5" radius=9 arcsec The first TAROT image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT with a limiting magnitude of: t0+36s to t0+96s : R > 15.4 The second image is 30.0s exposure in tracking mode: t0+103s to t0+133s : R > 15.5 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon= 37.9724 lat= -5.3391 and the galactic extinction in R band is about 1.8 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7053 SUBJECT: GRB 071109: further Swift-XRT analysis DATE: 07/11/10 19:05:09 GMT FROM: Matteo Perri at ISAC/ASDC M. Perri, G. Stratta (ASDC) and D.N. Burrows (PSU) report on behalf of the Swift-XRT team: We have analysed a further 4.9 ks of Swift-XRT Photon Counting mode data of the field of the INTEGRAL burst GRB 071109 (Mereghetti et al., GCN Circ. 7046), beginning ~5 hours after the INTEGRAL trigger. The possible afterglow candidate reported in GCN Circ. 7050 (Perri et al.) is detected also in this second image with a count rate of (2.4 +/-0.8)e-3 cts/s and thus is consistent with being constant between the two observations. We note that this X-ray source lies 3.7 arcmin from the INTEGRAL position and outside its 2.5 arcmin error circle. In the total Photon Counting mode exposure of 9.7 ks we did not detect any X-ray source within the INTEGRAL error circle (Mereghetti et al., GCN Circ. 7046) or at the position of the VLA radio source reported in GCN Circ. 7049 (Chandra & Frail). We estimate a three sigma upper limit on the count rate of about 1.5e-3 cts/s. Assuming a power-law spectrum with photon index Gamma=2 and a Galactic column of 2.5e21 cm-2, this corresponds to an upper limit on the observed flux of ~7e-14 ergs/cm2/s (0.3-10 keV). This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7054 SUBJECT: Swift/UVOT initial analysis of GRB071109 DATE: 07/11/11 01:41:58 GMT FROM: Paul Kuin at MSSL N.P.M. Kuin (MSSL/UCL) and M. Perri (ASDC) report on behalf of the Swift-UVOT team: The Swift/UVOT observed the INTEGRAL burst GRB 071109 (Mereghetti et al. GCN Circ. 7046) starting at 22:21 UT, 105 minutes after the trigger, cycling through exposures in the the uvw1, u, b, uvw2, v and uvm2 filters. No afterglow is detected at the position of the VLA measurement (Chandra et al. GCN Circ. 7049). A possible source at position RA=19:19:42.303,DEC=+02:01:21.14(J2000) was investigated, since it was detected at the 3-sigma level (u=20.9+/-0.6 mag) in the coadded U-filter images. This source is considered spurious since it was not found in any of the other filters, taken before or after the U-filter exposures. No other fading source is found within the INTEGRAL error circle in this is a crowded field. The following 3-sigma upper limits were determined at the position of the VLA detection (RA=19:19:51.67,DEC=+02:01:49.88): Filter Tstart(s) Tstop(s) Exp(s) Mag (3-sigma Upper Limits) uvw1 6350 24158 1678 > 21.47 u 6782 24373 835 > 21.17 b 7000 24588 835 > 21.56 uvw2 7220 25435 3346 > 22.25 v 8078 25651 835 > 20.58 uvm2 8300 26033 2189 > 21.73 The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E_{B-V} = 0.61 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7055 SUBJECT: VLA IInd observation of INTEGRAL burst GRB 071109 DATE: 07/11/11 03:56:14 GMT FROM: Poonam Chandra at U Virginia/NRAO P. Chandra (UVA/NRAO) and D. A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We observed the INTEGRAL burst GRB 071109 again using the VLA at a frequency of 8.46 GHz. The observations were taken at 0.87 UT on 2007, November 11th. We do not detect any radio emission at the position of our last detection (GCN 7049). The flux density limit is 33+/-28 uJy. This probably means that either our 10th November radio detection was not real or it was detection from the reverse shock, which faded away by now. We still do not detect any source at Swift-XRT position (GCN 7050). The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7056 SUBJECT: GRB071109: Super-LOTIS observations DATE: 07/11/11 07:39:50 GMT FROM: Peter A. Milne at Super-LOTIS P.A. Milne (U Arizona) reports on behalf of the Super-LOTIS team: The 0.60m Super-LOTIS telescope began R-band observations of the error region of INTEGRAL burst, GRB071109 (Mereghetti et al. GCN 7046), at 02:03:35 UT on 11-09-2007, ~337 minutes after the burst. Observations consisting of 48x60 second exposures were made through thin clouds. An afterglow was not detected at the positions of the VLA candidate source (Chandra et al. GCN 7049), nor the XRT candidate source (Perri, Stratta and Burrows GCN 7050), nor the UVOT candidate source (Kuin and Perri GCN 7054). Based upon R2 magnitudes were derived from the USNO-B1.0 catalog, the 3-sigma upper limit of the stacked image is R > 19.7. This message can be cited.