//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6605 SUBJECT: GRB 070707: A long GRB detected by INTEGRAL DATE: 07/07/07 22:21:44 GMT FROM: Volker Beckmann at ISDC V. Beckmann, C. Ricci, M. Beck (ISDC, Versoix), S. Mereghetti, 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 100 s has been detected by IBAS in IBIS/ISGRI data on July 7 at 16:08:21 UT. The coordinates (J2000) are: RA: 267.67 [degrees] DEC: -68.95 [degrees] with an uncertainty of 4 arcmin. The light curve is a single, FRED-like peak. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6607 SUBJECT: INTEGRAL GRB 070707 is a short hard burst DATE: 07/07/07 23:37:18 GMT FROM: Diego Gotz at IASF-CNR D. Gotz (CEA Saclay), V. Beckmann (ISDC, Versoix), S. Mereghetti, and A. Paizis (IASF, Milano) on behalf of the IBAS localization Team report: A refined analysis of GRB 070707 shows that it is composed by a single spike lasting about 1.1 s, and its spectrum can be well fit with a power law of slope 1.4, indicating a rather hard spectrum. Its refined position is R.A. (J2000): 267.7506 [degrees] DEC. (J2000): -68.9144 [degrees] with an uncertainty of 2.1 arcmin (90% c.l.) This messages can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6609 SUBJECT: GRB 070707: VLT observations DATE: 07/07/08 11:34:53 GMT FROM: Silvia Piranomonte at OAR P. D'Avanzo (INAF-OABr), S. Piranomonte, L. Stella (INAF-OAR) and G. Chincarini ((INAF-OABr) report on behalf of the MISTICI collaboration: We observed the field of the short GRB 070707 (Beckmann et al., GCN 6605; Gotz et al., GCN 6607) using FORS1 on the VLT telescope about 11 hours after the trigger time. We obtained 20 minutes of R-band imaging. Inside the refined INTEGRAL error circle (Gotz et al., GCN 6607) we do not detect any obvious afterglow candidate down to the depth of the DSS image. Our 3-sigma limiting magnitude is R=25.7. Further observations are planned. We acknowledge the ESO staff for reliable support. This message can be cited. ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6610 SUBJECT: Swift XRT observation of GRB 070707 DATE: 07/07/08 18:53:29 GMT FROM: Andy Beardmore at U Leicester A.P. Beardmore, K.L. Page (U. Leicester) and A. Parsons (GSFC) report on behalf of the Swift XRT team: On 2007 Jul 08 00:57:50UT the Swift XRT started observing the field of the INTEGRAL burst GRB 070707 (Beckmann et al., GCN 6606; Gotz et al., GCN 6607). In a 3.8ks exposure photon counting mode image taken from 31.8 ks to 54.1 ks after the trigger, we detect a source at RA, Dec = 267.7437, -68.9242, which is RA(J2000) = 17h 50m 58.49s Dec(J2000) = -68d 55m 27.0s with an uncertainty of 5.4 arcsec (90% containment). This is 36.3 arcsec from the position reported by Gotz et al. (GCN 6607), and within their error circle. Using a circular extraction region of 10 pixels radius, we observe 26 total counts. Together with an estimated background level of 1.0 count in the extraction region, we find the 99.73% Bayesian confidence level on the source count rate is 0.003 to 0.011 count s^-1. However, with such a limited number of photons, it is impossible to say at this stage whether the source is fading and if this is the X-ray counterpart to the GRB. This circular is an official product of the Swift XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6611 SUBJECT: Swift/UVOT Observations of GRB070707 DATE: 07/07/08 18:56:30 GMT FROM: Patricia Schady at MSSL/Swift P. Schady (MSSL-UCL) and A. Parsons (GSFC) report on the behalf of the Swift UVOT team: The Swift/UVOT observed the field of INTEGRAL burst, GRB070707 starting 8.8hrs after the INTEGRAL trigger (Beckmann et al. 2007, GCN Circ. 6606). We do not find any new source in any of the UVOT observations inside the refined INTEGRAL error circle (Gotz et al. 2007, GCN Circ. 6607) or XRT error circle (Beardmore et al. 2007, GCN 6610) The 3-sigma upper limits for detecting a source inside the refined XRT error circle in the initial data products are: Filter T_mid(s) Exp(s) Mag (3-sigma upper limit) ------------------------------------------------------- V 53885 543 19.7 B 31910 324 20.6 U 47905 97 19.5 UVW1 47149 964 20.3 UVM2 39328 1190 20.5 UVW2 53182 1800 20.5 ----------------------------------------------------------------- where T_mid is the weighted mid time of the coadded exposure. The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E_{B-V} = 0.08 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6612 SUBJECT: GRB 070707: object inside XRT error circle DATE: 07/07/08 19:10:28 GMT FROM: Paolo D'Avanzo at INAF-OAB S. Piranomonte (INAF-OAR), S. Vergani (DIAS-DCU), P. D'Avanzo & G. Tagliaferri (INAF-OABr) report on behalf of the MISTICI collaboration: Following the detection by Swift/XRT (Beardmore et al., GCN 6610) of GRB 070707 (Beckmann et al., GCN 6605; Gotz et al., GCN 6607), we have inspected our VLT R-band images (D'Avanzo et al., GCN 6609). Inside the XRT error box, we find a single source with R ~ 23.0 (calibrated using archival instrumental zeropoints), at the coordinates (J2000, 0.5" error): RA(2000) = 17:50:58.55 Dec(2000) = -68:55:27.2 At the present stage, we cannot yet assess the relationship of this source with GRB 070707. Further observations are planned. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6613 SUBJECT: GRB 070707: optical afterglow DATE: 07/07/09 04:20:54 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo (INAF-OABr), S. Piranomonte (INAF-OAR) & S. Vergani (DIAS-DCU) on behalf of the MISTICI collaboration L. Christensen, P. Amico (ESO) report: We observed again the field of the short/hard GRB 070707 (Beckmann et al., GCN 6605; Gotz et al., GCN 6607) with the ESO-VLT in imaging mode. Observations have been carried out around Jul 09.08 UT in the R band with the FORS1 camera. A comparison with the images of our previous observing run (D'Avanzo et al., GCN 6609) revealed that the object inside the XRT error box (Beardmore et al., GCN 6610) reported by Piranomonte et al. (GCN 6612) faded of about 0.7 +/- 0.1 mag. We thus propose this object as the optical afterglow of GRB 070707. Further observations are planned. We acknowledge the ESO staff for reliable support. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6615 SUBJECT: Konus-Wind observation of GRB 070707 DATE: 07/07/09 15:27:11 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report: The short GRB 070707 (Beckmann et al., GCN 6605; Gotz et al., GCN 6607) triggered Konus-Wind at T0=58122.823 s UT (16:08:42.823). The Konus-Wind light curve shows a multipeaked structure with a total duration of ~1 s. As observed by Konus-Wind the burst had a fluence of 1.41(-1.07, +0.16)x10^-6 erg/cm2, and a 16-ms peak flux measured from T0-0.016 s 8.1(-6.7, +2.9)x10^-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range). The spectrum of the most intense part of the burst (from T0 to T0+0.256) is well fitted (in the 20 keV - 2 MeV range) by a power law with exponential cutoff model: dN/dE ~ E^(-alpha)*exp(-E*(2-alpha)/Ep) with alpha = 0.57 (-0.59, +0.43) and Ep = 427(-144, +374) keV (chi2 = 13/19 dof). Thus, this burst is classified as a short hard GRB. All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB070707_T58122/