//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5117 SUBJECT: GRB 060512: Swift detection of a burst with an optical afterglow DATE: 06/05/12 23:57:25 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (NASA/ORAU), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), O. Godet (U Leicester), H. A. Krimm (GSFC/USRA), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. Stamatikos (NASA/GSFC/ORAU) report on behalf of the Swift Team: At 23:13:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060512 (trigger=209755). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 195.772, +41.212 {13h 03m 05s, +41d 12' 43"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peak with a duration of about 20 sec. The peak count rate was ~500 counts/sec (15-350 keV), at ~3 sec after the trigger. The XRT began observing the field at 23:15:02 UT, 102 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA(J2000) = 13h 03m 05.8s, Dec(J2000) = +41d 11' 30.4", with an estimated uncertainty of 7.6 arcseconds (90% confidence radius). This location is 73 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 2.6e-10 erg/cm2/s (0.2-10 keV). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 112 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at (RA,DEC) (J2000) of (195.7742,41.1909) or (13h03m05.81s,+41o11'27.2") with a 1-sigma error radius of about 0.5 arc sec. This position is 3.2 arc sec. from the center of the XRT error circle. The estimated magnitude is 16.2 with a 1-sigma error of about 0.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5118 SUBJECT: GRB060512: Liverpool Telescope Afterglow detection DATE: 06/05/13 00:24:58 GMT FROM: Carole Mundell at ARI, JMU,Liverpool C.G. Mundell and I.A. Steele report on behalf of the Liverpool GRB group: "The 2-m Liverpool Telescope followed up GRB060512 (SWIFT trigger 209755) approximately 20 min after the GRB trigger time. We confirm the UVOT identification of a fading OT (Cummings et al GCN 5117) at: 13:03:05.8 +41:11:26.8 +\- 0.5 arcsec (J2000) with magnitude r' = 18.2 +/- 0.3 mag (vs USNOB1) at 46 min. Observations and analysis are ongoing. This message may be cited" [GCN OPS NOTE(09dec06): The "060513" was changed to "060512".] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5119 SUBJECT: GRB060512 Name Correction: LT Afterglow detection DATE: 06/05/13 00:29:56 GMT FROM: Carole Mundell at ARI, JMU,Liverpool C.G. Mundell and I.A. Steele report on behalf of the Liverpool GRB group: "We incorrectly named GRB 060512 as 060513; we apologize for the mistake and reiterate: The 2-m Liverpool Telescope followed up GRB060512 (SWIFT trigger 209755) approximately 20 min after the GRB trigger time. We confirm the UVOT identification of a fading OT (Cummings et al GCN 5117) at: 13:03:05.8 +41:11:26.8 +\- 0.5 arcsec (J2000) with magnitude r' = 18.2 +/- 0.3 mag (vs USNOB1) at 46 min. Observations and analysis are ongoing. This message may be cited" //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5120 SUBJECT: GRB060512 - SDSS Pre-Burst Observations DATE: 06/05/13 00:44:51 GMT FROM: Richard J. Cool at U.of AZ/Steward Obs Richard J. Cool (Arizona), Daniel J. Eisenstein (Arizona), David W. Hogg (NYU), Michael R. Blanton (NYU), David J. Schlegel (LBNL), J. Brinkmann (APO), Donald Q. Lamb (Chicago), Donald P. Schneider (PSU), and Daniel E. Vanden Berk (PSU) report: The Sloan Digital Sky Survey (SDSS) imaged the field of burst GRB060512 prior to the burst. As these data should be useful as a pre-burst comparison and for calibrating photometry, we are supplying the images and photometry measurements for this GRB field to the community. Data from the SDSS, including 5 FITS images, 3 JPGS, and 3 files of photometry and astrometry, are being placed at http://mizar.as.arizona.edu/~grb/public/GRB060512 We supply FITS images in each of the 5 SDSS bands of a 8'x8' region centered on the GRB position (ra=195.775 (13:03:05.9), dec=41.1918 (41:11:30.5); GCN 5117), as well as 3 gri color-composite JPGs (with different stretches). The units in the FITS images are nanomaggies per pixel. A pixel is 0.396 arcsec on a side. A nanomaggie is a flux-density unit equal to 10^-9 of a magnitude 0 source or, to the extent that SDSS is an AB system, 3.631e-6 Jy. The FITS images have WCS astrometric information. In the file GRB060512_sdss.calstar.dat, we report photometry and astrometry of 268 bright stars (r<20.5) within 15' of the burst location. The magnitudes presented in this file are asinh magnitudes as are standard in the SDSS (Lupton 1999, AJ, 118, 1406). Beware that some of these stars are not well-detected in the u-band; use the errors and object flags to monitor data quality. In the files GRB060512_sdss.objects_flux.dat and GRB060512_sdss.objects_magnitudes.dat, we report photometry of 466 objects detected within 6' of the GRB position. We have removed saturated objects and objects with model magnitudes fainter than 23.0 in the r-band. The fluxes listed in GRB060512_sdss.objects_flux.dat are in nanomaggies while the magnitudes listed in GRB060512_sdss.objects_magnitudes.dat are asinh magnitudes. **Be aware that at least a portion of the photometry provided in this release has been flagged as non-photometric. As photometry for objects with this flag set may have non-optimal calibration, we do not recommend these objects be used for photometric calibration. Non-photometric imaging may still be valuable as a pre-burst comparison and for astrometric calibration. All quantities reported are standard SDSS photometry, meaning that they are very close to AB zeropoints and magnitudes are quoted in asinh magnitudes. Photometric zeropoints are known to about 2% rms. None of the photometry is corrected for dust extinction. The Schlegel, Finkbeiner, and Davis (1998) predictions for this region are A_U=0.087 mag, A_g=0.064 mag, A_r = 0.047 mag, A_i=0.035 mag, and A_z=0.025 mag. The file GRB060512_sdss.spectro.dat contains a list of the 2 objects with SDSS spectroscopy within 6 arcminutes of the GRB position. In addition to the redshift and 1-sigma error for each object, this file also lists the object spectroscopic classification. SDSS astrometry is generally better than 0.1 arcsecond per coordinate. Users requiring high precision astrometry should take note that the SDSS astrometric system can differ from other systems such as those used in other notices; we have not checked the offsets in this region. More detailed information pertaining to our SDSS GRB releases can be found in our initial data release paper (Cool et al. 2006, astro-ph/0601218). See the SDSS DR4 documentation for more details: http://www.sdss.org/dr4. These data have been reduced using a slightly different pipeline than that used for SDSS public data releases. We cannot guarantee that the values here will exactly match those in the data release in which these data are included. In particular, we expect the photometric calibrations to differ by of order 0.01 mag. This note may be cited, but please also cite the SDSS data release paper, Adelman-McCarthy et al. (2006, ApJS, in press, astro-ph/0507711), when using the data or referring to the technical documentation. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5121 SUBJECT: GRB 060512: REM NIR observations DATE: 06/05/13 01:16:07 GMT FROM: Daniele Malesani at SISSA-ISAS,Trieste,Italy S. Covino, D. Malesani, P. D'Avanzo, E. Molinari, G. Chincarini, F.M. Zerbi, V. Testa, G. Tosti, F. Vitali, L.A. Antonelli, P. Conconi, G. Cutispoto, G. Malaspina, L. Nicastro, E. Palazzi, E. Meurs, and P. Goldoni report on behalf of the REM/ROSS team: We imaged the field of GRB 060512 (Cummings et al., GCN 5117) with the robotic 60-cm REM telescope located at La Silla (Chile). Observations were performed automatically in the near infrared (J, H, K, z bands) starting 62 s after the GCN alert (almost 14 minutes after the GRB). The first observations were performed at about airmass 6.8, under difficult conditions. Preliminary analysis of the dataset does not show any new source down to approximately H = 15.2 at the position of the optical afterglow reported by Cummings et al. (GCN 5117) and Mundell et al. (GCNs 5118, 5119). Further observations and analysis are still in progress. This message is citeable. [GCN OPS NOTE(14may06): Per author's request, Antonelli was added to the author list.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5122 SUBJECT: GRB 060512: optical decay DATE: 06/05/13 02:14:27 GMT FROM: Daniele Malesani at SISSA-ISAS,Trieste,Italy D. Malesani (SISSA), S. Piranomonte (INAF-OAR), S. Covino (INAF/OABr), N. Masetti, E. Maiorano (INAF/IASF Bo), A. Magazzu', G. Mainella (INAF/TNG), report on behalf of a larger collaboration: We observed the optical afterglow of GRB 060512 (Cummings et al., GCN 5117) with the 3.6 TNG telescope located in the Canary Islands. Two R-band observations were acquired under good observing conditions, with mean times May 13.018 and May 13.065 UT (1.2 and 2.3 hr after the GRB, respectively). The optical afterglow (Cummings et al., GCN 5117; Mundell & Steele, GCN 5118) is well detected and faded by 0.58 +- 0.04 mag between the two epocs. The inferred decay index is alpha = 0.81 +- 0.06, assuming a flux decay F(t) = K*t^-alpha. We acknowledge significant support from the observing staff at TNG. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5124 SUBJECT: GRB 060512: Swift-BAT Refined Analysis DATE: 06/05/13 03:23:39 GMT FROM: Hans Krimm at NASA-GSFC J. Cummings (GSFC/ORAU), S. Barthelmy (GSFC), L. Barbier (GSFC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), on behalf of the Swift-BAT team: Using the data set from T-119.9 to T+182.2 sec from the recent telemetry downlink, we report further analysis of BAT GRB 060512 (trigger #209755) (Cummings, et al., GCN 5117). The BAT ground-calculated position is (RA,Dec) = 195.746, 41.209 deg {13h 2m 59.0s, 41d 12' 30.8"} (J2000) +- 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 41%. The masked-tagged light curve shows a single peak from about T-4 sec to T+8 sec with most emission in the band from 15 to 50 keV. T90 (15-350 keV) is 8.6 +- 2 sec (estimated error including systematics). There is no significant further emission in the flight-generated masked-tagged light curve out to T+450 sec. The time-averaged spectrum from T-4.4 to T+5.3 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.49 +- 0.30. The fluence in the 15-150 keV band is 2.3 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+3.30 sec in the 15-150 keV band is 0.9 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5126 SUBJECT: GRB 060512: Detection of NIR afterglow DATE: 06/05/13 07:50:38 GMT FROM: Don Lamb at U.Chicago GRB 060512: Detection of NIR afterglow F. Hearty (Colorado), D. Q. Lamb (Chicago), R. McMillan (APO), J. Bally (Colorado), G. Wolf-Chase (Chicago), H.-W. Chen (Chicago), D. G. York (Chicago), M. Bayliss (Chicago), B. Ketzeback (APO), J. Barentine (APO), and J. Dembicky (APO) report: We have observed the afterglow (Cummings et al, GCN 5117; Mundell and Steele, GCN 5118; Malesani et al., GCN 5122; Cenko, GCN 5125) of GRB 060512, a bright burst localized by Swift BAT (Cummings et al., GCNs 5117, 5124), beginning at about 5:36 UT on 13 May 2006 (about 6.4 hours after the burst) under partly cloudy conditions, using NIC-FPS on the ARC 3.5-meter telescope at Apache Point Observatory. The observation consisted of a series of 15 20-second exposures in Ks. From them, we have constructed a stacked image of the GRB field, corresponding to a 5-minute exposure. We measure a magnitude for the afterglow of Ks = 17.7 +/-0.2. Further observations are underway. NIC-FPS is currently in its commissioning phase. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5125 SUBJECT: GRB 060512: P60 Observations DATE: 06/05/13 06:35:23 GMT FROM: S. Bradley Cenko at Caltech S. B. Cenko (Caltech) reports on behalf of a larger collaboration: We have imaged the field of GRB060512 (Cummings et al., GCN 5117) with the automated Palomar 60-inch Telescope. Observations consisted of 5 x 150 s exposures taken in the Kron R band. The mean epoch of our observations was approximately 03:50 13 May 2006 UT (~ 4.6 hrs after the burst). We clearly detect the afterglow and measure an R-band magnitude of R ~ 20.1 (calculated with respect to the USNO-B catalog). Comparing with the early afterglow detection reported by Mundell and Steele (GCN 5119), we measure a decay index of alpha ~ 1.0. We note this is slightly steeper than the value reported by Malesani et al. (GCN 5122), although not significant enough to claim a break in the light curve. Further observations are underway. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5127 SUBJECT: GRB 060512: 1.54m Kuiper Observations DATE: 06/05/13 08:56:52 GMT FROM: Peter A. Milne at Super-LOTIS P.A.Milne (Steward Obs) on behalf of the Super-LOTIS GRB team reports: We observed the field of GRB 060512 starting at UT=05:48 (~6.6 hrs after the burst), with the 1.54m Kuiper telescope at Mt. Bigelow, AZ. We obtained 5 x 300-sec images in the R-band filter. The mean epoch of observations was 05:59 13 May 2006. Observing conditions were affected by thin clouds in addition to the bright moon. We detect the candidate optical counterpart reported by Cummings et al. (GCN 5117), Mundell and Steele (GCN 5118), Malesani et al. (GCN 5122) , Cenko (GCN 5125), and Hearty et al. (GCN 5126). Based upon comparison with USNO-B stars, we estimate the magnitude to be R=20.14 +/- 0.16. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5128 SUBJECT: GRB060512: Swift XRT Team refined analysis DATE: 06/05/13 12:14:51 GMT FROM: Olivier Godet at U.of Leicester O. Godet, K.L. Page (U. Leicester), D. N. Burrows (PSU) report on behalf of the Swift XRT team: We have analysed the Swift XRT data of GRB 060512 from the first 5 orbits (~8.8 ks). The refined coordinates on ground are: RA(J2000) = 13h 03min 05.8s Dec(J2000) = +41d 11' 28.3" with an uncertainty of 3.6 arc-seconds radius (90% containment). This position is consistent with that reported by Cummings et al. (GCN 5117). The refined position is also consistent with the optical position given by the UVOT (GCN 5117) and the 2-m Liverpool Telescope (Mundell et al., GCN 5118). The WT and PC light-curve show a decay with a temporal index of -1.3 +/-0.04 on which is superposed a flare peaking at around 200 s after the BAT trigger (T0). We note that the decay part of a flare could be also seen in the WT data (from T0+102s to T0+150s). Due to the low statistics of the PC and WT data, the data are poorly constrained with an absorbed power-law. However, the spectra of the WT data and the first orbit of PC data (containing the flare) are clearly soft with Gamma > 3 and nH = 4.9 + 6.0/-4.5 e20 cm^-2. Note that this nH-value is consistent with the Galactic absorbing column of 1.4e20 cm^-2. The spectrum of the late PC data (from T0+3000s to T0+24,000s) has a spectral slope of 1.93+/0.18 fixing the absorbing column to the Galactic one. If the light-curve is still unbroken at T0+24 h, the predicted count rate will be 0.0014 counts/s (corresponding to an unabsorbed 0.3-10 keV flux of 6.6e-14 erg cm^-2 s^-1). This Circular is an official product of the Swift XRT Team. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5129 SUBJECT: GRB 060512: Subaru NIR observation DATE: 06/05/13 17:07:54 GMT FROM: Nobuyuki Kawai at Tokyo Tech I. Tanaka, (Subaru Telescope, NAOJ), N. Kawai (Tokyo Tech), C. Tokoku, M. Akiyama (Subaru Telescope, NAOJ), T.Ichikawa, T. Koyano (Tohoku Univ.), T. Yoshikawa, and M. Konishi (Tohoku Univ/Subaru Telescope) report on behalf of the Subaru GRB team and the MOIRCS team: "We observed the field of GRB 060512 (Cummings et al., GCN 5117) with MOIRCS on the 8.2m Subaru Telescope at 11:02 UT (11.8 hours after the burst). With the 2x60s exposure, we detected the source with Ks=18.4 +/- 0.2. Comparison with the earlier NIR detection (Hearty et al., GCN 5126) implies a decay index of 1.05 +/- 0.07 in the Ks band. It is consistent with the decay index reported by Cenko (GCN 5125) based on the R band observations at 46 min (Mundell and Steele, GCN 5119) and 4.6 hours after the burst. " //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5130 SUBJECT: Swift/UVOT observations of GRB060512. DATE: 06/05/14 02:15:47 GMT FROM: Massimiliano de Pasquale at MSSL-UCL M. De Pasquale (UCL-MSSL) and J. Cummings (NASA/ORAU) report on behalf of the Swift/UVOT team: The Swift/UVOT began observing the afterglow of GRB 060512 (Cummings et al., 5117) at 2006-05-12 at 23:14:54, 94 s after the BAT trigger. A bright optical afterglow is detected in the U, V, B, and white filters inside the XRT refined error circle (Godet et al., GCN 5128). We obtain the following photometry of the afterglow. Filter Exposure(s) T_range(s) Magnitude Note V 10 94-104 15.88 +/- 0.17 V 230 217-447 17.15 +/- 0.11 V 197 2804-3004 19.14 +/- 0.42 V 885 9466-10369 20.05 +/- 0.41 V 885 27685-28591 >20.18 3-sig limit B 197 4290-4490 19.50 +/- 0.21 B 197 5722-5922 20.17 +/- 0.35 B 146 17069-17117 >20.2 3-sig limit U 197 4145-4345 19.48 +/- 0.30 U 197 5520-5720 19.69 +/- 0.29 U 885 16757-17657 20.31 +/- 0.23 U 345 22847-23192 20.40 +/- 0.46 W1 2166 3881-22840 >21.0 3-sig limit M2 2923 3676-29221 >21.1 3-sig limit W2 3481 4700-27718 >21.04 3-sig limit White 99 114-214 16.34 +/- 0.03 White 197 4494-4694 19.14 +/- 0.33 White 197 5927-6126 19.67 +/- 0.35 The detection in the U, B and V, together with the non-detection in the UV filters, may indicate that the redshift of this burst is less than approximately 2.5. The values quoted above are not corrected for the low expected Galactic extinction E(B-V)=0.02. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5131 SUBJECT: VLT optical spectroscopy of GRB 060512 DATE: 06/05/14 17:34:10 GMT FROM: Rhaana Starling at GRACE/U of Amsterdam R. Starling (Amsterdam), C.C. Thoene, J.P.U. Fynbo (DARK), P. Vreeswijk (ESO) and J. Hjorth (DARK) report on behalf of a larger collaboration: We observed the optical transient of GRB 060512 (first reported by Cummings et al. GCN 5117) with the ESO FORS1 Long Slit Spectrograph under poor observing conditions, beginning at 2006-05-13 02:06:43 UT with an exposure of 2x1800s. The spectrum covers the range 3850-8750A. Preliminary analysis shows the afterglow to be blue, consistent with the magnitudes given in De Pasquale & Cummings (GCN 5130). We report a break in the continuum around 4800A and bluewards which, if identified as the onset of the Lyman-alpha forest, indicates a redshift in the range z ~ 2.7-2.9. The signal-to-noise is too low to allow identification of further lines. We thank the staff and observers at ESO Paranal. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5140 SUBJECT: GRB 060512: TAROT optical observation DATE: 06/05/15 15:07:31 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 060512 detected by SWIFT (trigger 209755) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. First image was acquired 796.8s after the GRB trigger (5s after the notice). The field elevation decreased from 65 degrees above horizon and weather conditions were good but the full moon was at 68 deg from the GRB position. We detected the OT source mentioned by Cummings et al (GCNC 5117). We co-added series of unfiltered exposures to increase signal to noise ratio: t-t_trig (min) begin - end CRmag 1*sigma(mag.) 13.3 34.7 17.64 0.28 34.8 228.3 19.03 0.60 t_trig = 2006-05-12T23:13:20.640 (Date of trigger) CR means Clear filter calibrated by R magnitude. Magnitudes were estimated by PSF fit with the two following nearby USNO-B1 stars: 1311-0234453 R=16.63 (I=14.94) 1311-0234485 R=17.09 (I=15.87) We combined R optical observations (Mundell et al. GCNC 5119, Malesani et al. GCNC 5122 assuming R=18.65 at t-t_trig=1.2h, Cenko et al. GCNC 5125, Milne et al. GCNC 5127) with those of TAROT. All these data are compatible with a decay index alpha 0.85 +/- 0.08 (assuming a flux decay F(t) = K*t^-alpha). Complementary data are available on: http://www.cesr.fr/~klotz/grb060512/ This message can be cited //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5145 SUBJECT: GRB 060512: TNG optical spectroscopy DATE: 06/05/16 16:48:31 GMT FROM: Daniele Malesani at SISSA-ISAS,Trieste,Italy S. Piranomonte (INAF/OARm), E. Maiorano (INAF/IASF Bo), V. D'Elia (INAF/OARm), N. Masetti (INAF/IASF Bo), F. Fiore (INAF/OARm), D. Malesani (SISSA/ISAS), G. Mainella, A. Magazzu' (INAF/TNG), report on behalf of a larger collaboration: We observed the optical transient of GRB 060512 (Cummings et al. GCN 5117; Mundell et al., GCN 5119) with the 3.6m TNG telescope located in the Canary Islands. Two mid-resolution spectra (~10 A FWHM) were obtained with TNG+DOLoRes, starting on 2006 May 13.0423 UT, for a total exposure time of 40 minutes. The spectra cover the range 4000-8000 A. Inspection of the spectrum does not reveal any obvious absorption system. We find no signs of the continuum break around 4800 A reported by Starling et al. (GCN 5131). Our spectrum shows a continuum extending blueward down to ~4000 A (the limit of our grism), suggesting z < 2.3. We thank the observing staff at TNG. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5149 SUBJECT: GRB 060512: reanalysis of optical spectra DATE: 06/05/19 13:08:08 GMT FROM: Rhaana Starling at GRACE/U of Amsterdam R. Starling (Amsterdam), V. D'Elia (INAF/OARm), S. Piranomonte (INAF/OARm), J.P.U. Fynbo (DARK), D. Malesani (SISSA/ISAS), C.C. Thoene (DARK), J. Hjorth (DARK), P. Vreeswijk (ESO), F. Fiore (INAF/OARm), E. Maiorano (INAF/IASF Bo), N. Masetti (INAF/IASF Bo), report: Following further analysis of the optical spectra of GRB 060512 (Cummings et al., GCN 5117) taken with TNG+DOLoRes (Piranomonte et al., GCN 5145) and VLT+FORS1 (Starling et al., GCN 5131), we issue a retraction of the redshift range estimated in GCN 5131, which arose from an error in the preliminary flux calibration. In both the TNG and the VLT spectra we see no break in the continuum emission and no obvious features in either absorption or emission. A possible solution might be z~2.1, based only, however, on a low significance, broad feature in absorption seen at the bluemost limit of the TNG spectrum which, if identified as Lyman-alpha 1215A, implies this redshift. A plot of the TNG spectrum can be found here: http://www.sissa.it/~malesani/GRB/060512/spec_TNG.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5156 SUBJECT: GRB060512: Late-Time P200 Observations DATE: 06/05/23 04:50:32 GMT FROM: S. Bradley Cenko at Caltech S. B. Cenko and W. H. Baumgartner (Caltech) report on behalf of a larger collaboration: We have imaged the field of GRB060512 (Cummings et al.; GCN 5117) with the Large Format Camera mounted on the 5-m Palomar Hale Telescope. Observations consisted of 5 x 180 s images in the r' filter taken at a mean epoch of May 21.25 UT. At the location of the optical afterglow, we detect an object with approximate r' magnitude 23.7 +/- 0.2 (calculated with respect the SDSS calibration provided by Cool et al.; GCN 5120). If we assume limited contamination from an underlying host galaxy, the afterglow decay remains consistent with the early-time power-law index of 0.85 (Klotz et al.; GCN 5140), indicating a late jet-break time. However, futher observations are required to verify the host galaxy brightness. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5217 SUBJECT: GRB 060512: Keck Redshift DATE: 06/06/05 11:24:28 GMT FROM: Josh Bloom at UC Berkeley GRB 060512: Keck Redshift J. S. Bloom, R. J. Foley, D. Koceveki, D. Perley (UC Berkeley) report: "On 31 May 2006 UT, we observed a source consistent with the position of the X-ray and optical afterglow of GRB 060512 (Cummings et al. GCN 5117; Mundell et al. GCN 5119) with the Keck I (+LRIS) telescope. In a single 1200 sec spectrum we detect emission features at 5380, 7014, 7155, and 7224 Ang which we identify as [O II] 3727, H beta, and [O III] 4959, 5007 at a redshift of z = 0.4428. The [O II] feature is resolved as a doublet. This source is therefore is likely the host (cf. Cenko et al. GCN 5156). This redshift confirms the hypothesis by Piranomonte et al. (GCN 5145), that z_GRB < 2.3, would apparently refute the claim that at z_GRB ~ 2.7 - 2.9 (Starling et al. GCN 5131). Analysis of other imaging and spectra is on going. Given the relatively low redshift and the current time since the burst, observations are encouraged to search for any associated supernova which would currently be near peak brightness." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5267 SUBJECT: GRB060512: near IR observations DATE: 06/06/16 19:37:45 GMT FROM: Alexei Pozanenko at IKI, Moscow D. Sharapov (MAO and NOT, La Palma), A. Djupvik (NOT, La Palma) , A.Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed optical afterglow of GRB060512 (Cummings et al. GCN 5117; Klotz et al. GCN 5140) in Nordic Optical Telescope with NOTcam in near IR (J) on May 13 between (UT) 02.40 - 03:44. A brightness of the OT is following: J mag, Err,Exposure, T0+ (Mid time,s) 18.90 0.09 8x90s 12838 18.96 0.09 8x90s 13849 19.09 0.10 8x90s 14843 19.14 0.11 8x90s 15835 The calibration is based on 2MASS star RA = 13:02:57.846 DEC = +41:10:23.08, J = 14.485 +/-0.03 and consistent with calibration based on IR standard star observation in the same night. A power law decay index alpha ~ 1.1 in J between (UT) 02.40 - 03:44 (May ,13) is compatible with the index deduced from Ks observations (Hearty et al. GCN 5126, Tanaka et al. GCN 5129). The first combined image of 8x90s exposure can be found in http://grb.rssi.ru/GRB060512/grb060512_NOT_J.jpg