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"At 05:51:04.67 UT on 18 May 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090518B (trigger 264318666 / 090518244). The on-ground calculated location, using the GBM trigger data, is RA = 211.2, DEC = -16.7 (J2000 degrees, equivalent to 14h 05m, -16d 42'), with an uncertainty of 4.5 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error...Full Text

We have observed the field covering the error circle of GRB 090516 (Swift trigger 352190, GCN 9374, Rowlinson et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 11:16:08 UT (1.8 hr after the Swift trigger), under cloudy condition. First image was obtained at 11:17:11 UT (1.8 hr after the Swift trigger). We have compared our data...Full Text

"At 21:58:47.92 UT on 13 May 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090513 (trigger 263944729 / 090513.916). The on-ground calculated location, using the GBM trigger data, is RA = 269.8, DEC = -31.6 (J2000 degrees, equivalent to 17 h 59 m, -31 d 36'), with an uncertainty of 4.6 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error...Full Text

We searched for an optical afterglow of GRB 090518 (GCN 9386, Evans et al.; GCN 9387, Evans et al.) starting from 7:02:10 UT (5 hours after the burst) with the MOA-II 1.8m telescope at Mt.John observatory in New Zealand. In a single image of a 300sec exposure with a wideband Red filter (center wavelength ~ 750nm and FWHM ~ 250nm), we did not find any object within the error circle of the Swift...Full Text

We have analysed 6.4 ks of XRT data for GRB 090518 (Evans et al. GCN 9386), from 88 s to 13.0 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 9387). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.5 (+0.4, -0.3). At T+332 s the decay...Full Text

Using 3965 s of XRT Photon Counting mode data and 8 UVOT images for GRB 090518, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 119.95404, +0.75921 which is equivalent to: RA (J2000): 07h 59m 48.97s Dec (J2000): +00d 45' 33.2" with an uncertainty of 1.6 arcsec (radius, 90% confidence). This position...Full Text

At 01:54:44 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090518 (trigger=352420). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 119.933, +0.768 which is RA(J2000) = 07h 59m 44s Dec(J2000) = +00d 46' 04" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a...Full Text

For GRB 090515 (Beardmore et al. GCN 9356), the BAT team has analyzed spectral lags for the data from T-0.05 sec to T+0.1 sec using non-mask weighted light curves with 1 msec time binning. The spectral lags were measured between standard canonical BAT energy bands: channel 1 (15-25 keV), 2 (25-50 keV), 3 (50-100 keV) and 4 (100-350 keV) are given below. Lag Ch3-Ch1 : 3.9 (+2.4, -2.1) msec Lag Ch3-Ch2...Full Text

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We have reanalysed the spectrum of the afterglow of GRB 090516 (Rowlinson et al., GCN 9374; Guidorzi et al., GCN 9375) obtained with the ESO VLT (de Ugarte Postigo et al. GCN 9381). Due to an error in the preliminary reduction, the wavelength calibration had an offset that has been now corrected. In our new analysis we detect a strong Ly-alpha absorption together with absorption lines of NV,...Full Text

We observed the field of GRB 090516 (Swift trigger 352190, B. Rowlinson et al.,GCN 9374) 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 16 May 2009 at 23:04 UT, 14.6 h after the burst. We detect the afterglow at a position consistent with the enhanced XRT error circle (A. Beardmore et al., GCN 9376) and NOT...Full Text

SOURCE: GCN TITLE: GCN CIRCULAR NUMBER: 9381 SUBJECT: GRB 090516: VLT redshift DATE: 09/05/17 02:47:56 GMT FROM: Antonio Deugarte at IAA-CSIC <deugarte@iaa.es> A. de Ugarte Postigo (ESO), J. Gorosabel (IAA/CSIC), D. Malesani, J.P.U. Fynbo (DARK/NBI), A. J. Levan (Univ. Warwick), report on behalf of a larger collaboration: We observed the optical afterglow of GRB 090516 (Rowlinson...Full Text

T.P. Vaalsta, Liang Yan, J. Zadko, H. Miao, J. Moore, K. Frost, D. Coward, A. Imerito, D. Blair, R. Burman, P. Luckas, S. Gordon, A. Fletcher, A. Ahmet, (University of Western Australia) M. Todd, M. Zadnik (Curtin University) M. Boer, A. Klotz (TAROT) The 1.0m F/4 Zadko telescope started imaging the field of GRB 090516 (trigger=352190, D. Palmer et al., GCN 9374) 275 minutes after the Swift trigger...Full Text

We observed the optical afterglow of GRB 090516 (Guidorzi et al. GCN 9375) with the 2.5m NOT(+STANCAM) telescope. On May 16.889 UT (12.9 hours post GRB) the afterglow shows an R-band magnitude of R=21.3+/-0.1 against USNO-B1.0 field stars. ...Full Text

We have analysed 3.0 ks of XRT data for GRB 090516 (Rowlinson et al. GCN 9374), from 170 s to 6.4 ks after the BAT trigger. The data comprise 327 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 9376). The light curve can be modelled with a power-law decay with two flares superimposed...Full Text

The Swift/UVOT began observing the field of GRB 090516 171s after the BAT trigger (Beardmore et al., GCN 9374). Data summed from the first and second orbits does not reveal a source at the refined position of the X-ray afterglow (Beardmore et al., GCN 9376). The 3-sigma upper limits for the finding chart (fc) and summed exposures are reported below: FILTER T_start(s) T_stop Exposure...Full Text

Using 2534 s of XRT Photon Counting mode data and 5 UVOT images for GRB 090516, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 138.26050, -11.85442 which is equivalent to: RA (J2000): 09h 13m 2.52s Dec (J2000): -11d 51' 15.9" with an uncertainty of 1.5 arcsec (radius, 90% confidence). This position...Full Text

The 2-m Faulkes Telescope South reacted to the Swift burst GRB 090516 (trigger=352190, Rowlinson et al. GCN 9374). Observations started about 16.9 min after the trigger time with filters BRi. Within the XRT error circle we found a fading source at the following position (J2000): RA: 09:13:02.62 Dec: -11:51:15.4 with an initial approximate magnitude of R~19 at 17 minutes post trigger. ...Full Text

At 08:27:50 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090516 (trigger=352190). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 138.271, -11.858 which is RA(J2000) = 09h 13m 05s Dec(J2000) = -11d 51' 27" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed...Full Text