//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12666 SUBJECT: GRB 111211A: SuperAGILE localization of a long GRB DATE: 11/12/12 07:34:30 GMT FROM: Marco Feroci at IASF/INAF F. Lazzarotto, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli (INAF/IASF Bologna), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), M. Tavani, G. Pucella, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini, M. Cardillo (INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone, F. D'Ammando (INAF/IASF Palermo), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Picozza, A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report: "SuperAGILE detected a gamma ray burst on 11 December 2011, at 22:17:33 UT. The event had a duration of about 15 s in the 20-60 keV energy range, with a double peak (with internal structure). Assuming a crab-like energy spectrum, the peak flux on 1-s timescale was 1.50E-06 erg/cm2/s. The burst position was reconstructed as (RA, Dec) (153.091, 11.182) deg, which is: RA(J2000) = 10h 12m 21.84s Dec(J2000) = 11d 10' 55.52" with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors. An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12668 SUBJECT: GRB 111211A: GROND afterglow candidate DATE: 11/12/12 09:43:14 GMT FROM: Jochen Greiner at MPI D.A. Kann (TLS Tautenburg), J. Greiner (MPE Garching), T. Kruehler (DARK/NBI) and S. Klose (TLS Tautenburg) report on behalf of the GROND team: We observed the field of the SuperAGILE burst GRB 111211A (Feroci et al. 2011, GCN #12666) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP, 120, 405) mounted at the 2.2 m ESO/MPG telescope at La Silla Observatory (Chile). Observations started on December 12, 2011, at 07:50 UT, 8.5 hrs after the GRB. They were performed at an average seeing of 1".1 and at an airmass of 1.4 Within the 3 arcmin error circle we find one source brighter than the DSS limit, and not seen on the DSS2-red plate or SDSS-r, at the following coordinate: RA (2000.0) = 10:12:21.7 Decl. (2000.0) = 11:12:30 with a conservative error of 0.7 arcsec. This is 1.6 arcmin from the center of the SuperAGILE error circle. We propose this source as the afterglow of GRB 111211A. We estimate a rough r-band magnitude (calibrated against the SDSS) of r'(AB) = 19.0 No obvious fading is detected, though this is not constraining given the short GROND coverage and the time after the GRB. Further observations are encouraged to check for the expected fading. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12673 SUBJECT: GRB 111211A: Swift/XRT target of opportunity observation DATE: 11/12/12 22:16:39 GMT FROM: Binbin Zhang at PSU B.-B. Zhang (PSU) report on behalf of the Swift Team: Swift began a target of opportunity observation of GRB 111211A on December 12, 2011 at 15:53 UT, approximately 0.74 days after the burst was detected by SuperAGILE. Swift data for these observations utilize Target ID 20192. We have analysed 2.5 ks of XRT data for the SuperAGILE-detected burst: GRB 111211A (Lazzarotto et al. et al. GCN Circ. 12666), from 63.5 ks to 66.0 ks after the SuperAGILE trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the SuperAGILE error circle. Using 2512 s of PC mode data and 3 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 153.09040, +11.20789 which is equivalent to: RA (J2000): 10h 12m 21.70s Dec(J2000): +11d 12' 28.4" with an uncertainty of 1.8 arcsec (radius, 90% confidence). This position is 93 arcsec from the SuperAGILE position and 1.6 arcsec from the GROND afterglow candidate position (Kann et al. GCN Circ. 12668), which confirms it is the X-ray afterglow of GRB 111211A. The light curve is consistent with a constant source of mean count rate 1.3e-01 ct/sec. A power-law fit gives an index of -1.309 (+4.183, -0.020). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.02 (+0.18, -0.26). The best-fitting absorption column is 1.3 (+0.7, -0.6) x 10^21 cm^-2, in excess of the Galactic value of 3.4 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (4.9 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.3 (+0.7, -0.6) x 10^21 cm^-2 Galactic foreground: 3.4 x 10^20 cm^-2 Excess significance: 2.5 sigma Photon index: 2.02 (+0.18, -0.26) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020192. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12675 SUBJECT: GRB 111211A: NOT afterglow confirmation DATE: 11/12/13 07:40:21 GMT FROM: Thomas Kruehler at Dark Cosmology Center T. Kruehler and D. Malesani (both DARK/NBI) report on behalf of a larger collaboration: We observed the field of the AGILE GRB 111211A (Lazzarotto et al., GCN 12666) with the NOT telescope equipped with StanCam. A single R-band image with an integration time of 600 s was obtained on 2011-12-13 at 03:34 UT, which is roughly 29.3 hours after the trigger. We clearly detect the optical afterglow candidate (Kann et al., GCN 12668) at RA = 10:12:21.68 Dec = +11:12:29.3 with an uncertainty of approximately 0.3 arcsec in each coordinate. Calibrating our R-band image against the r- and i-band magnitudes of the SDSS catalog via the transformation of Lupton et al. (2006), we measure a preliminary magnitude of R = 19.5 +/- 0.1 (Vega system). This implies a significant fading with respect to the earlier measurements of Kann et al. (GCN 12668), and hence confirms this source to be the afterglow of GRB 111211A. We are grateful to the NOT staff and observer, Ilya Ilyin for obtaining these observations. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12676 SUBJECT: Konus-Wind observation of GRB 111211A DATE: 11/12/13 12:48:30 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team report: The long GRB 111211A localized by SuperAGILE (Lazzarotto et al., GCN 12666) was detected by Konus-Wind in the waiting mode. The burst light curve shows two pulses with a total duration of ~25 s. As observed by Konus-Wind, the burst had a fluence of (9.2 +/- 0.8)x10^-6 erg/cm2 (in the 20 - 1200 keV energy range). Fitting the K-W 3-channel time-integrated spectrum (from T0-18.141 s to T0+8.355 s) by a simple power-law model yields a power law index of 2.77(-0.16, +0.18) (chi2=2.0/1 dof). All the quoted errors are at the 90% confidence level. The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB111211A/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12677 SUBJECT: GRB 111211A: VLT/X-shooter redshift DATE: 11/12/13 14:22:36 GMT FROM: Silvia Piranomonte at OAR S.D. Vergani (OAB/INAF), S. Piranomonte (OAR/INAF), O.E.Hartoog (UvA, Netherland), V. D'Elia (ASDC/INAF), G. Cupani (OAT/INAF), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), T. Kruehler, J.P.U. Fynbo, Bo Milvang-Jensen, D. Malesani (DARK/NBI), P. Vreeswijk (U. Iceland), N. R. Tanvir (U. Leicester) and L. Kaper (UvA, Netherland) report on behalf of the X-shooter GTO GRB afterglow collaboration: The afterglow of the AGILE GRB 111211A (Lazzarotto et al., GCN 12666, Kann et al. 12668 and Kruehler et al. GCN 12675) was observed with the X-shooter spectrograph mounted on the ESO-VLT. Observations started around 7 UT on 13 December 2011 (1.3 days after the GRB). A series of four spectra of 600 s each were secured, covering the approximate wavelength range 3000-25000 AA. Preliminary reduction of the ultraviolet, visual and near-infrared parts of the spectra show a smooth continuum with some weak absorption features that we can identify with resonance absorption lines of FeII, MgII and CaII at a redshift of z=0.478, which very likely correspond to the redshift of GRB 111211A. Weak emission lines ([O III] doublet and Halpha) are also observed at the same redshift. We thank D.A. Kann for providing us the GROND finding chart and we are grateful for the excellent support from the Paranal Observatory staff, in particular Willem-Jan de Wit (Shift coordinator), Dimitri Gadotti (Night Astronomer), Marcelo Lopez (Telescope and Instrument Operator) and Gabriel Brammer (Day Astronomer). ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12678 SUBJECT: GRB 111211A: Swift/UVOT Detection DATE: 11/12/13 17:06:55 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel and B.-B. Zhang (PSU) report on behalf of the Swift-UVOT team: We have analyzed 4.5 ks of UVOT data for the SuperAGILE-detected burst GRB 111211A (Lazzarotto et al., GCN Circ 12666), taken 63.5 to 76.6 ks after the trigger. Data were taken entirely in the white filter. We confirm the uncatalogued source reported by Kann et al. (GCN Circ. 12668), Zhang (GCN Circ. 12673) and Kruehler et al. (GCN Circ. 12675). However, we can not confirm any statistically significant fading at this time. The UVOT position is RA, Dec = 153.09037, +11.20801 which is equivalent to: RA (J2000): 10h 12m 21.69s Dec(J2000): +11d 12' 28.9" with an uncertainty of 0.5 arcsec (radius, 90% confidence). Preliminary photometry using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) shows: Filter T_start(ks) T_stop(ks) Exp(s) Mag white 63.5 76.6 4550 19.51+-0.03 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12704 SUBJECT: GRB 111211A: optical ovservations at Mt. Terskol observatory DATE: 11/12/19 19:48:14 GMT FROM: Alexei Pozanenko at IKI, Moscow A.Volnova (SAI MSU), M. Andreev, A. Sergeev (Terskol Branch of INASAN), V. Petkov (Baksan Neutrino Observatory of INR), N. Karpov, O. Andrienko, K. Martynyuk-Lototsky, N. Parakhin, N. Borachok, V. Kozlov, G. Butenko, V. Godunova (IC AMER, NASU), A. Pozanenko (IKI) report: We observed field of the SuperAGILE GRB 111211A (Lazzarotto et al. GCN 12666) with Zeiss-600 telescope of Mt.Terskol observatory in R filter between Dec. 12 (UT) 23:09:07 -- Dec.13 00:55:27. We took several images of 60 exposure under good weather conditions and mean seeing (FWHW) of about 1.8". We detect the source reported as candidate in afterglow (Kann et al., GCN 12668; Kruehler et al., GCN 12675). A photometry is based on the USNO-B1.0 1011-0183238 (10:12:26.16 +11:11:26.6) star assuming R = 14.41. T0+ Filter, Exposure, OT, UpperLimit (mid, d) (s) 1.07273 R 104x60 19.25 +/- 0.10 20.0 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12802 SUBJECT: GRB 111211A: Detection of the SN with the 10.4m GTC DATE: 12/01/03 23:30:26 GMT FROM: Antonio de Ugarte Postigo at IAA-CSIC A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene and J. Gorosabel (IAA-CSIC) report on behalf of a larger collaboration: Using the 10.4m GTC telescope + OSIRIS, at the Roque de los Muchachos Observatory (La Palma, Spain), we obtained late imaging and spectroscopy of the SuperAGILE GRB 111211A (Lazzarotto et al. GCN 12666, Kann et al. GCN 12668), located at a redshift of 0.478 (Vergani et al. GCN 12677) at 2 epochs. On 27 December 2011 (15.3 days after the burst) we obtained imaging in r-band of 6x180s with a seeing of ~0.9". This image clearly shows the afterglow of GRB 111211A at a magnitude of r ~ 22.6 (compared to SDSS stars) superposed to its resolved host galaxy but slightly offset towards the North East. Spectroscopy of the afterglow was obtained on 1 January 2012 (20.3 days after the burst) under good seeing conditions (~1"). At that time, the afterglow was detected at r ~ 22.7 in the acquisition frame, implying an almost flat evolution since the previous epoch which indicates a possible supernova component contributing to the light curve. We obtained 3x1800s spectroscopy at a resolution of ~ 500 and wavelength coverage from ~ 5 000 to 10 000 Angstrom. The spectrum shows both emission from the GRB and the host galaxy. The host shows emission lines of [OII], H-beta, [OIII] and H-alpha at a redshift of 0.478, consistent with the redshift of the GRB (Vergani et al. GCN 12677). The spectrum at the position of the afterglow shows undulations typical of a SN spectrum similar to the spectrum of the type Ic SN 2006aj / GRB 060218 close to maximum. We acknowledge excellent support from the GTC staff, in particular D. Reverte, A. Cabrera Lavers and R. Rutten.