////////////////////////////////////////////////////////////////////// TITLE: GCN/HETE BURST POSITION NOTICE NOTICE_DATE: Tue 11 May 04 13:40:44 UT NOTICE_TYPE: HETE S/C_Alert TRIGGER_NUM: 3218, Seq_Num: 1 GRB_DATE: 13136 TJD; 132 DOY; 04/05/11 GRB_TIME: 46906.09 SOD {13:01:46.09} UT TRIGGER_SOURCE: Trigger on the 25-400 keV band. GAMMA_RATE: 137 [cnts/s] on a 5.200 [sec] timescale SC_-Z_RA: 203 [deg] SC_-Z_DEC: -23 [deg] SC_LONG: 184 [deg East] WXM_CNTR_RA: 223.566d {+14h 54m 16s} (J2000), 223.642d {+14h 54m 34s} (current), 222.701d {+14h 50m 48s} (1950) WXM_CNTR_DEC: -49.884d {-49d 53' 01"} (J2000), -49.901d {-49d 54' 04"} (current), -49.681d {-49d 40' 49"} (1950) WXM_MAX_SIZE: 28.00 [arcmin] diameter WXM_LOC_SN: 5 sig/noise (pt src in image) WXM_IMAGE_SN: X= 4.0 Y= 3.0 [sig/noise] WXM_LC_SN: X= 7.2 Y= 3.5 [sig/noise] SUN_POSTN: 48.74d {+03h 14m 57s} +18.05d {+18d 03' 03"} SUN_DIST: 147.89 [deg] MOON_POSTN: 326.30d {+21h 45m 11s} -19.08d {-19d 04' 41"} MOON_DIST: 83.30 [deg] MOON_ILLUM: 49 [%] GAL_COORDS: 322.35,8.30 [deg] galactic lon,lat of the burst ECL_COORDS: 236.73,-31.67 [deg] ecliptic lon,lat of the burst COMMENTS: Probable GRB. COMMENTS: WXM error box is circular; not rectangular. ////////////////////////////////////////////////////////////////////// TITLE: GCN/HETE BURST POSITION NOTICE NOTICE_DATE: Tue 11 May 04 13:40:47 UT NOTICE_TYPE: HETE S/C_Last TRIGGER_NUM: 3218, Seq_Num: 2 GRB_DATE: 13136 TJD; 132 DOY; 04/05/11 GRB_TIME: 46906.09 SOD {13:01:46.09} UT TRIGGER_SOURCE: Trigger on the 25-400 keV band. GAMMA_RATE: 137 [cnts/s] on a 5.200 [sec] timescale SC_-Z_RA: 203 [deg] SC_-Z_DEC: -23 [deg] SC_LONG: 184 [deg East] WXM_CNTR_RA: 223.566d {+14h 54m 16s} (J2000), 223.642d {+14h 54m 34s} (current), 222.701d {+14h 50m 48s} (1950) WXM_CNTR_DEC: -49.884d {-49d 53' 01"} (J2000), -49.901d {-49d 54' 04"} (current), -49.681d {-49d 40' 49"} (1950) WXM_MAX_SIZE: 28.00 [arcmin] diameter WXM_LOC_SN: 5 sig/noise (pt src in image) WXM_IMAGE_SN: X= 4.0 Y= 3.0 [sig/noise] WXM_LC_SN: X= 7.2 Y= 3.5 [sig/noise] SUN_POSTN: 48.74d {+03h 14m 57s} +18.05d {+18d 03' 03"} SUN_DIST: 147.89 [deg] MOON_POSTN: 326.30d {+21h 45m 11s} -19.08d {-19d 04' 41"} MOON_DIST: 83.30 [deg] MOON_ILLUM: 49 [%] GAL_COORDS: 322.35,8.30 [deg] galactic lon,lat of the burst ECL_COORDS: 236.73,-31.67 [deg] ecliptic lon,lat of the burst COMMENTS: Probable GRB. COMMENTS: WXM error box is circular; not rectangular. ////////////////////////////////////////////////////////////////////// TITLE: GCN/HETE BURST POSITION NOTICE NOTICE_DATE: Tue 11 May 04 15:11:31 UT NOTICE_TYPE: HETE Ground Analysis TRIGGER_NUM: 3218, Seq_Num: 3 GRB_DATE: 13136 TJD; 132 DOY; 04/05/11 GRB_TIME: 46906.08 SOD {13:01:46.08} UT TRIGGER_SOURCE: Trigger on the 25-400 keV band. GAMMA_RATE: 137 [cnts/s] on a 5.200 [sec] timescale SC_-Z_RA: 202 [deg] SC_-Z_DEC: -23 [deg] SC_LONG: 184 [deg East] WXM_CNTR_RA: 222.082d {+14h 48m 20s} (J2000), 222.154d {+14h 48m 37s} (current), 221.260d {+14h 45m 02s} (1950) WXM_CNTR_DEC: -44.469d {-44d 28' 07"} (J2000), -44.487d {-44d 29' 11"} (current), -44.261d {-44d 15' 38"} (1950) WXM_CORNER1: 221.8760 -44.2500 [deg] WXM_CORNER2: 222.1800 -44.1950 [deg] WXM_CORNER3: 222.2880 -44.6870 [deg] WXM_CORNER4: 221.9830 -44.7430 [deg] WXM_MAX_SIZE: 33.93 [arcmin] diameter WXM_LOC_SN: 17 sig/noise (pt src in image) WXM_IMAGE_SN: X= 5.0 Y= 3.0 [sig/noise] WXM_LC_SN: X= 15.0 Y= 9.0 [sig/noise] SXC_CNTR_RA: 221.958d {+14h 47m 50s} (J2000), 222.030d {+14h 48m 07s} (current), 221.138d {+14h 44m 33s} (1950) SXC_CNTR_DEC: -44.252d {-44d 15' 04"} (J2000), -44.270d {-44d 16' 09"} (current), -44.043d {-44d 02' 34"} (1950) SXC_MAX_SIZE: 2.67 [arcmin] diameter SXC_LOC_SN: 3 sig/noise (pt src in image) SUN_POSTN: 48.74d {+03h 14m 57s} +18.05d {+18d 03' 03"} SUN_DIST: 153.18 [deg] MOON_POSTN: 326.30d {+21h 45m 11s} -19.08d {-19d 04' 41"} MOON_DIST: 86.48 [deg] MOON_ILLUM: 49 [%] GAL_COORDS: 323.95,13.82 [deg] galactic lon,lat of the burst ECL_COORDS: 233.39,-26.73 [deg] ecliptic lon,lat of the burst COMMENTS: Definite GRB. COMMENTS: SXC error box is circular; not rectangular. COMMENTS: The WXM & SXC positions are consistant; overlapping error boxes. COMMENTS: Burst_Validity flag is true. COMMENTS: WXM data refined since S/C_Last Notice. COMMENTS: SXC data refined since S/C_Last Notice. COMMENTS: Invalid localization by flight code. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2588 SUBJECT: GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC DATE: 04/05/11 17:07:56 GMT FROM: Roland Vanderspek at MIT GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC A. Dullighan, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley, on behalf of the HETE Science Team; T. Donaghy, E. Fenimore, M. Galassi, C. Graziani, M. Matsuoka, Y. Nakagawa, T. Sakamoto, R. Sato, Y. Shirasaki, M. Suzuki, T. Tamagawa, K. Torii, Y. Urata, T. Yamazaki, Y. Yamamoto, and A. Yoshida, on behalf of the HETE WXM Team; N. Butler, G. Crew, J. Doty, G. Prigozhin, R. Vanderspek, J. Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams; M. Boer, J-F Olive, J-P Dezalay, C. Barraud, and K. Hurley, on behalf of the HETE FREGATE Team; report: At 13:01:46 UTC (46906 s UT) on 11 May 2004, the HETE FREGATE, WXM, and SXC instruments detected event GRB040511 (=H3218), a long, bright GRB. The burst triggered FREGATE in the 30-400 keV energy band. A flight localization was distributed automatically 39 minutes after the trigger: the long delay was due to dropouts in the HETE Burst Alert Network. Subsequent analysis of the full data set revealed that the prompt WXM Y location was in error: the correct WXM localization is a box with corners located at RA = 14h 47m 30.2s, Dec = -44d 15m 00s RA = 14h 48m 43.2s, Dec = -44d 11m 42s RA = 14h 49m 09.1s, Dec = -44d 41m 13s RA = 14h 47m 55.9s, Dec = -44d 44m 34s (J2000). Analysis of the SXC data reveal a 90% confidence error region of 80" radius (5.6 sq. arcmin area) centered at: SXC-Ground: RA = 14h 47m 50s, Dec = -44d 15' 04" (J2000). Preliminary analyses of the burst spectrum give a value of Epeak of ~100 keV and a 30-400 keV fluence of ~1e-5 erg/cm2, with a SNR of 32.2 and a duration (t90) of 38 s. Details of this burst can be found on the HETE web page at http://space.mit.edu/HETE/Bursts/GRB040511. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2589 SUBJECT: GRB040511: Optical Observations DATE: 04/05/12 07:09:23 GMT FROM: Gerald Bourban at Geneva Observatory G.Bourban*, D.Naef* **, G.Burki*, F.Carrier* and L.Weber* report: (* Geneva Observatory, Switzerland) (** ESO Santiago, Chile) We have carried out optical observations of the field of GRB 040511 (HETE trigger #3218, GCN 2588) using the C2 CCD Camera (12'x 12') mounted on the Swiss 1.2-meter telescope located at the ESO La Silla Observatory (Chile), beginning at 22:58 UT on 2004 May 11 (9.93 hours after the burst). We obtained four R filtered images, with exposure times of 180 and 480 s. The comparison between these images with the USNO-A2 catalog does not reveal any new source down to a limiting magnitude of R < 19.4 inside the 80" error circle around the position provided by the HETE SXC Ground analysis (GCN 2588). This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2590 SUBJECT: GRB040511: Optical Observations DATE: 04/05/12 11:43:43 GMT FROM: D. Bhattacharya at Raman Research Inst. Brijesh Kumar*, Arti Goyal*, Ram Sagar* and D. Bhattacharya** (* Aryabhatta Research Institute of Observational Sciences, Nainital) (** Raman Research Institute, Bangalore) report: Optical observation of the field of GRB 040511 (HETE trigger #3218, GCN 2588) was carried out using a 1k x 1k CCD Camera covering a field of 6'x 6', mounted on the 104-cm Sampurnanand telescope located at Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital. We took frames at 20:17 UT on 11 May, 2004 (7.16 hours after the burst) at large (about 5.4) airmass. We obtained three 300s R band images. Visual comparison of the combined images with the USNO-A2.0 catalog does not reveal any new source down to a limiting magnitude of R ~ 19.5 inside the 2.67 arcmin error circle around the position reported by HETE SXC (GCN 2588). Images can be obtained from the authors (e-mail: brij@upso.ernet.in). This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2591 SUBJECT: GRB 040511: Optical Observations DATE: 04/05/12 16:50:18 GMT FROM: Josh Bloom at Harvard/CFA GRB 040511: Optical Observations Hsiao-Wen Chen (MIT), Nidia Morrell (Las Campanas Observatory), Joshua S. Bloom (Harvard/CfA), Jason X. Prochaska (UCO/Lick) report on behalf of the GRAASP (GRB Afterglows as Probes) Collaboration: "We have obtained optical images of the field around GRB 040511 (Dullinghan et al., GCN #2588) using the SITe#3 CCD imager and Rc filter on the 40" Swope telescope at the Las Campanas Observatory. The camera has a plate scale of 0.435 arcsec per pixel and covers an 14.7' x 20' field of view. The observations were carried out starting at 00:15 UT 12 May 2004 (~11 hours after the burst). Three exposures of 300 sec duration were taken under photometric conditions. The 5-sigma depth of the stacked image is R~23.4 over a 2"-diameter aperture. A comparison of our stacked image with the DSS/POSS2 red plate shows no new source to the limit of the plate Rc=20.8." A finding chart and all the imaging data are publicly available at http://www.graasp.org/. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2592 SUBJECT: GRB 040511: Optical observations DATE: 04/05/12 21:26:51 GMT FROM: Javier Gorosabel at Danish Space Res Inst J. Gorosabel and M. Jelinek (IAA-CSIC Granada) J. Mendez (ING Group, La Palma) P. Ruiz-Lapuente (Univ. de Barcelona) J. M. Castro Ceron (STScI, Baltimore) A. de Ugarte Postigo and A. J. Castro-Tirado (IAA-CSIC) report: "We have obtained several exposures covering the HETE/SXC error box for GRB 040511 (Dullighan et al. GCN 2588) with the Prime Focus Camera at the 4.2 m William Herschel telescope at La Palma. The images were taking at a considerable airmass starting on May 11.991--12.022 UT (R-band filter, with a stacked exposure time of 1800-s). After a visual comparison with the Digital Sky Survey (DSS-2) red plate, no variable object is found down to about R = 21 in a ~ 8' x 12' field around the 3' SXC position." This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2594 SUBJECT: GRB 040511: Second Epoch Optical Observations DATE: 04/05/13 06:30:49 GMT FROM: Josh Bloom at Harvard/CFA GRB 040511: Second Epoch Optical Observations Nidia Morrell (Las Campanas Observatory), Hsiao-Wen Chen (MIT), Joshua S. Bloom (Harvard/CfA), Jason X. Prochaska (UCO/Lick), A. Dullighan, G. Ricker, N. Butler, and R. Vanderspek (MIT): "We have obtained a second epoch of R-band images of the field around GRB 040511 (Dullinghan et al., GCN #2588) using the SITe#3 CCD imager on the 40 inch Swope telescope at the Las Campanas Observatory. The observations were carried out starting at 01:30 UT 13 May 2004 (~36 hours after the burst). Three exposures of 600 sec duration were taken under photometric and sub-arcsec seeing conditions. The 5-sigma depth of the stacked image is R~23.6 mag over a 2"-diameter aperture. A comparison of the stacked image with the first-epoch images obtained at ~11 hr after the burst (Chen et al., GCN #2591) shows that none of the ~7100 sources of Rc <~ 23 in the 14.8' x 20' region have variability by more than 0.25 mag. The few larger-amplitude outliers in the magnitude (epoch1) vs. magnitude (epoch2) plot are due to detector artifacts." The magnitude-magnitude plot that shows the comparison of object photometry obtained from two epochs and all the imaging data are publicly available at http://www.graasp.org/. Click the "Data" link. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2595 SUBJECT: GRB 040511: ROTSE-III Rapid Optical Upper Limits DATE: 04/05/13 16:23:16 GMT FROM: Don Smith at U michigan D. A. Smith (NSF/U of Michigan) reports on behalf of the ROTSE collaboration: The ROTSE-IIIa telescope (at SSO, Australia) responded rapidly to both the intitial on-board alert and the final ground analysis alert distributed by HETE-2 for GRB 040511 (HETE #3218, Dullighan et al., GCN Circ. #2588). In both cases, the first ROTSE-IIIa exposure began within 3.5 s of the alert time stamp. The final SXC localization was outside the field of view of the first series of ROTSE-IIIa images, so those data are not included in this report. The second series of images began at 15:11:34.57 UTC, ~2.2 h after the burst trigger time. The instrument responded automatically with a pre-programmed sequence of ten 5-s and ten 20-s images, after which it recorded 44 60-s images. The first 60 images were co-added in sets of ten, reaching limiting magnitudes of ~17.2 for the 5-s images and ~17.5 for the others. (ROTSE-III images are unfiltered, but calibrated to USNO A2.0 R-band.) Comparison of these images to the USNO catalogs and the DSS 2nd Generation R-band image reveal no new sources. The detected foreground sources are estimated to cover ~10-15% of the SXC error circle. In short, ROTSE-IIIa provides the following approximate R-band upper limits (the first column is the elapsed time to the middle of the co-added exposure): Time from Exp. Time Upper Limit Burst Trigger (hours) (sec) 2.18 50 17.2 2.24 200 17.5 2.37 600 17.5 2.57 600 17.5 2.76 600 17.6 2.95 600 17.5 //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2597 SUBJECT: GRB040511: Candidate optical/NIR afterglow DATE: 04/05/14 01:51:23 GMT FROM: Derek Fox at CIT D.B. Fox, E. Berger and D. Moon (Caltech), with K. von Braun and B. Lee (Carnegie), report: "We have imaged the SXC localization region for GRB040511 (Dulligan et al., GCN 2588) in the J-band with the Dupont telescope + WIRC imager at Las Campanas Observatory, on two occasions. Our first-night imaging consists of 21 minutes' exposure at mean epoch May 12.05 UT (12.2 hours post-burst) in 1" seeing; our second-night imaging consists of 15 minutes' exposure at mean epoch May 13.35 UT (43.4 hours post-burst) in 0.75" seeing. PSF-matched image subtraction of the combined images from these two nights reveals a single source within the SXC region that fades significantly between the two epochs, from J~19.0 mag to J~20.9 mag as referenced to 2MASS photometry of the field. Since the source is also observed to fade (by ~1.3 mag) in the contemporaneous (t+11 hour and t+36 hour, respectively) R-band imaging of Morrell et al. (GCN 2594) and Chen et al. (GCN 2591), we conclude that it is a likely afterglow candidate. The source coordinates are: RA 14:47:49.33, Dec -44:14:21.8 (J2000) as referenced to 2MASS catalog astrometry; the uncertainty in this position is < 0.5". The image-pixel coordinate position of the candidate on the first-epoch imaging of Chen et al. (see http://www.graasp.org/, "DATA" section, file "grb040511_R1.fits") is X=1214.6, Y=1463.8. The authors would like to express their gratitude to the the Carnegie Supernova Program for this allocation of time, and to the GRAASP collaboration for the public release of their data in FITS format. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2598 SUBJECT: GRB 040511: Optical limit DATE: 04/05/14 10:51:44 GMT FROM: Kenzo Kinugasa at Gunma Astro. Obs/Japan Kenzo Kinugasa (Gunma Astronomical Observatory), Ken'ichi Torii (Osaka University), and Mitsuhiro Kohama (RIKEN), report; The SXC error region of GRB 040511 (HETE trigger #3218, GCN 2588) was automatically observed with the GETS system of the Gunma Astronomical Observatory, starting at 2004 May 11, 15:18:02 UT. The telescope is 25-cm Schmidt Cassegrain equipped with unfiltered CCD camera (AP7p). After co-adding a set of 15 frames of 30 sec exposures (mean epoch 15:25:52 UT), we compared the image with the USNO A2.0 catalog. We found no new source brighter than R=15 mag in the SXC error region. Also, an upper limit of R=15.1 mag is obtained for the afterglow candidate (Fox, et al. GCN 2597). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2599 SUBJECT: GRB040511: Redshift identifcation DATE: 04/05/14 18:22:00 GMT FROM: Edo Berger at Caltech E. Berger, D.B. Fox, S.G. Djorgovski (Caltech) with T. Treu and M. Malkan (UCLA) report: "We obtained three 900-sec spectra of the GRB 040511 afterglow candidate (GCN 2597) with the Low Resolution Imaging Spectrometer (LRIS) on the Keck-I telescope. Inspection of the 2-d spectra reveals two strong emission lines which we identify as Lyman-alpha and HeII 1640A at a redshift of 2.63. We also note a decrease in the continuum flux level blueward of the line we identify as Ly-alpha, strengthening the association. We conclude that this is the likely redshift of the GRB. The detection of a strong HeII line suggests the presence of a source of strongly-ionizing photons in the host, e.g. an AGN." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2600 SUBJECT: GRB 040511: NIR observations with REM DATE: 04/05/15 15:05:40 GMT FROM: Vincenzo Testa at INAF/Astro. Obs. of Rome GRB040511: REM telescope robotic NIR observations. V. Testa, L.A. Antonelli (INAF-OAR), L.Calzoletti (Univ. Roma Sapienza), S. Covino (INAF-OAB), G. Chincarini (Univ. Milano Bicocca), F. M. Zerbi (INAF-OAB), E. Palazzi (IASF-CNR,Bologna), G. Tosti (Univ. Perugia), L. Nicastro (IASF-CNR,Palermo), on behalf of the REM collaboration report: On May 12 the 60cm robotic telescope REM at ESO-La Silla observed the field of GRB040511, that was detected by HETE2 ~12 hours before, during day time at La Silla. The observations were performed with the REMIR near-IR camera during commissioning phase in the wide band filters J,H and Ks in fully automatic mode, following a predefined sequence suited for late grb alerts. Frames obtained in the three filters were co-added together to obtain three images per filter, having total exposure times of 60, 360 and 720s. The comparison with the 2MASS catalog did not reveal evident new sources, with 3 sigma upper limits, on the 720s images, of 18.6 in the J filter, 18.2 in the H filter and 16.6 in the Ks filter. Images were calibrated by using a number of 2MASS stars in the field with high S/N ratio. It was not possible to observe simultaneously in the optical bands because the optical spectrograph ROSS was in maintenance. [GCN OPS NOTE: This Circular was delayed 13 hours until daytime when I could register V.Testa as a new member of the list.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2602 SUBJECT: GRB 040511, very fast decay? DATE: 04/05/20 22:07:46 GMT FROM: David Bersier at STScI D. Bersier, J. M. Castro Cerón, J. Rhoads, A. Fruchter (STScI), A. Levan (U. of Leicester), J. Gorosabel (IAA-CSIC), C. Kouveliotou (NASA/MSFC, NSSTC), S. Patel (USRA, NSSTC), M. Merrill (NOAO), J. Bally, J. Walawender, (U. Colorado), and B. Reipurth (Hawaii) report on behalf of a larger collaboration: We have observed the field of GRB 040511 (GCN Dullighan et al. 2004, GCN 2588) with the CTIO 4m telescope on the nights of May 11 and May 12. Our R-band photometry of the candidate afterglow (Fox et al. 2004, GCN 2597) shows that this source decayed by 2.5 mag between 0.79d and 1.60d after the burst. Assuming that the decay follows a power law, we derive an index of -3.2. If the variable source is indeed the afterglow of GRB 040511, this would be among the fastest decay indices ever observed. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2610 SUBJECT: GRB040511: Retraction of redshift identification DATE: 04/06/14 23:44:00 GMT FROM: Edo Berger at Caltech E. Berger (Caltech) reports: "A re-examination of the spectra of GRB 040511 obtained with the Low Resolution Imaging Spectrometer on the Keck-I telescope, and comparison with later spectroscopic observations of the region, reveal that the lines (and hence redshift) identified previously (GCN 2599) are in fact not associated with the optical afterglow (OA) position (GCN 2597), but are instead associated with a galaxy 10.6" away. No continuum or lines are identified at the actual OA position. We apologize for any inconvenience that this may have caused."