//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2838 SUBJECT: GRB041211: P60 optical imaging DATE: 04/12/11 14:45:31 GMT FROM: Derek Fox at CIT Derek B. Fox reports on behalf of the Caltech-NRAO-Carnegie GRB collaboration: "We have imaged the 80-arcsec radius SXC error circle of GRB041211 (HETE 3622) with the robotic Palomar 60-inch telescope, in a single 120-second exposure in Gunn i band at mean epoch 13:40:35 UT on 2004-12-11. To a limiting equivalent magnitude of R~19 mag we detect no new objects by reference to the Digitized Sky Survey (second epoch). Comparison of contemporaneous imaging of most of the rest of the 16-arcmin radius WXM error circle to the DSS has also not yielded any optical afterglow candidates to this point." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2839 SUBJECT: GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC DATE: 04/12/11 17:55:42 GMT FROM: Don Lamb at U.Chicago GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC J-P Dezalay, 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, Y. Urata, T. Yamazaki, Y. Yamamoto, and A. Yoshida, on behalf of the HETE WXM Team; N. Butler, G. Crew, J. Doty, A. Dullighan, 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; C. Barraud, M. Boer, J-F Olive, and K. Hurley, on behalf of the HETE FREGATE Team; report: The HETE FREGATE, WXM, and SXC instruments detected GRB 041211 (=H3622) at 11:31:47 UT (41507 SOD) on 11 December 2004. No prompt location was issued because of a lack of real-time spacecraft aspect information. Ground analysis of the WXM data produced a location that was reported in a GCN Notice issued at 12:51:48 UT. This localization can be expressed as a circle of 8 arcminutes radius (90% confidence) that is centered at WXM-Ground: RA = 06h 43m 53s, DEC = +20d 20' 17" (J2000). The WXM location was further refined, resulting in a new location that was reported in a GCN Notice at 11:31:47 UT. This localization can be expressed as a circle of 8.6 arcminutes radius (90% confidence) that is centered at WXM-Ground: RA = 06h 43m 27s, DEC = +20d 19' 58" (J2000). Ground analysis of the SXC data resulted in a location that was issued in the same Notice as the refined WXM localization. This localization can be expressed as a circle of 80 arcseconds radius that is centered at SXC-Ground: RA = 06h 43m 12s, DEC = +20d 23' 42" (J2000). The burst has a duration > 100 s. Preliminary spectral analyses show the 2-30 keV fluence of GRB 041211 to be 2.4 x 10-6 ergs cm-2 and the 30-400 keV fluence to be 1.0 x 10-5 ergs cm-2. Therefore GRB 041211 is a classical "hard" GRB. The empirical redshift indicator for this burst gives a pseudoZ~3.0. A light curve, skymap, and spectral information for GRB 041211 are provided at the following URL: http://space.mit.edu/HETE/Bursts/GRB041211 This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2840 SUBJECT: GRB 041211: Optical follow-up in East Asian region DATE: 04/12/11 18:35:42 GMT FROM: Kuiyun Huang at IANCU GRB 041211: Optical follow-up in East Asian region S. Nishiura(Tokyo Gakugei Univ.), D. Kinoshita (NCU), C.L. Lu (BAO) K. Y. Huang (NCU), Y. Urata (RIKEN), Y. Qiu (BAO), on behalf of the East Asian collaboration report: " We have imaged the entire GRB 041211 error circle (Dezalay et al. GCN 2839) at Kiso (Japan), Lulin (Taiwan) and XingLong (China) observatory. The observations are summarized as below: Start time(UTC) Filter Exposure (sec) Limit mag. Site (SN=3) Dec. 11.55 Rc 300 x 1 >~18 Kiso Dec. 11.63 R 300 x 3 >~20 Lulin Dec. 11.63 R 300 x 1 >~20 XingLong Limiting magnitudes were estimated by comparison with several USNO-B1.0 stars. Comparison with DSS II images, no new object was detected down to the limiting magnitude." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2841 SUBJECT: GRB 041211: KAIT observations DATE: 04/12/12 03:06:49 GMT FROM: Weidong Li at UC Berkeley KAIT/LOSS W. Li, A. V. Filippenko, R. Chornock, and S. Jha (University of California, Berkeley) report: "The Katzman Automatic Imaging Telescope (KAIT; see Li et al. 2003, PASP, 115, 844) at Lick Observatory robotically observed GRB 041211 (HETE Trigger #3622). One batch of 16 unfiltered images was taken from 12:52:24 UT to 13:22:03 UT, covering a 12.6' x 12.6' field centered on the WXM position R.A. = 06h43m53s, DEC = +20d 20'17" (J2000). Another batch of 4 images was taken from 13:56:44 UT to 14:06:00 UT, covering a 6.6' x 6.6' field centered on the revised WXM position R.A. = 06h43m27s, DEC = +20d 19'58" (J2000). We detected no new objects in our observations when compared to the DSS II images. The following 3-sigma limiting magnitudes are derived (calibrated with USNO-A2.0 red magnitudes): R~17.1 mag for a 3 x 5s unfiltered grid image started at 12:52:24 UT (4837s after the burst), R~18.4 for a 60s unfiltered image started at 12:59:20 UT (5253s after the burst)." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2842 SUBJECT: GRB 041211: Infrared Observations DATE: 04/12/12 08:26:34 GMT FROM: Josh Bloom at Harvard/CFA GRB 041211: Infrared Observations C. H. Blake (CfA), J. S. Bloom (CfA; UCB), D. L. Starr (Gemini), M. F. Skrutskie (U. Virginia), A. H. Szentgyorgyi (CfA), and E. E. Falco (SAO), report: "The 1.3m Peters Automated Infrared Imaging Telescope (PAIRITEL; http://pairitel.org) at Mt. Hopkins, AZ was used to autonomously observe the HETE-2 SXC error circle of GRB 041211 (Dezalay et al.; GCN #2839) in the J,H,Ks near-infrared bands. Approximately 30 minutes of observations were made between 12-12-2004 05:03:00 UT and 12-12-2004 05:54:00 UT of a 10'x10' field centered on RA=06:43:12 DEC=+20:23:42 (J2000). We detect no new sources within or around the SXC error circle to the limiting magnitude of 2MASS (approximately J=16.4, H=16.3, Ks=15.7). We note that this data was obtained with the same instrument and filter set as the archival 2MASS Atlas images but are significantly deeper than the 2MASS limit. We will continue to monitor this field." A finding chart may be found at: http://pairitel.org/GRB041211 This message may be cited. We are grateful for the assistance of the Mt. Hopkins Ridge staff. The Peters Automated Infrared Imaging Telescope is operated by the Smithsonian Astrophysical Observatory (SAO) and was made possible by a grant from the Harvard University Milton Fund and the camera loan from the University of Virginia. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2843 SUBJECT: GRB041211,optical observation DATE: 04/12/12 18:50:57 GMT FROM: Eri Sonoda at U of Miyazaki/Japan E.Sonoda,S.Maeno,Y.Matsuo, M.Yamauchi (University of Miyazaki) "We have observed the field covering the SXC error box of GRB041211(HETE trigger 3622; trigger time 11:31:47 UT ) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki.The observation was started 12:52:07 UT on Dec.11. Observed field of view is 43 arcmin centerd on (06h 43m 09s , +20d 22' 35.5"). We have compared our images with the USNO A2.0 catalog . Preliminary analysis shows there is no new source brighter than 17.2 mag. in the SXC error box reported by HETE. " //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2844 SUBJECT: GRB041211, BVRcIc field calibration DATE: 04/12/13 05:59:51 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired BVRcIc all-sky photometry for a 11x11 arcmin field centered on the SXC coordinates for the HETE burst GRB041211 (trigger 3622; Dezalay et al., GCN 2839) with the USNOFS 1.0-m telescope on one photometric night. Stars brighter than V=13.5 are saturated and should be used with care. We have placed the photometric data on our anonymous ftp site: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb041211.dat The astrometry in this file is based on linear plate solutions with respect to UCAC2. The external errors are less than 100mas. The estimated external photometric error is about 0.02mag and will be improved with additional calibration nights if an afterglow is found. As always, you should check the dates on the .dat file prior to final publication to get the latest photometry. There is a README file on the ftp directory to give you information about the procedures used to calibrate these fields. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2845 SUBJECT: GRB041211, Faulkes Telescope optical observation DATE: 04/12/13 18:46:04 GMT FROM: Cristiano Guidorzi at ARI,Liverpool JMU C. Guidorzi, A. Monfardini, C.J. Mottram (Liverpool John Moores University) and the Liverpool GRB team, on behalf of the larger Robonet consortium, report: "We obtained BVRI images of the SXC error box of GRB041211 detected by HETE-II (GCN 2839) with the 2-m Faulkes Telescope North on Maui, Hawaii. Observations started on December 11.615 UT, i.e. 3.2 hours after the GRB with an average seeing of 1.3 arcsec. The robotic GRB pipeline did not find any new objects with reference to USNOB, GSC2.3 and 2MASS catalogues. Time from GRB ExpTime Filter Limit Mag. (days) (s) ----------------------------------------------- 0.135 2x10 B 19.1 0.135 2x10 V 19.1 0.135 2x10 R 19.2 0.135 2x10 I 18.8 ----------------------------------------------- The above limit magnitudes have been derived using the calibration provided by Henden et al. (GCN 2844). After visual inspection of a 2 min R image taken soon after the automatic sequence reported above, we do not find any new candidate within the DSS limit. This message can be cited." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2846 SUBJECT: GRB041211: Ashra Prototype optical observation DATE: 04/12/15 07:31:58 GMT FROM: Koji Noda at ICRR,U of Tokyo M.Sasaki, Y.Aita, T.Aoki, Y.Asaoka, M.Jobashi, N.Manago, K.Noda, A.Okumura (ICRR,Univ.Tokyo), S.Ogawa (Toho Univ.), and H.Usami (Tohoku Univ.), on behalf of the Ashra collaboration, report: We have observed the field covering the WXM error box of GRB041211 with the prototype unit of All-sky Survey High Resolution Air-shower detector (Ashra, http://www.icrr.u-tokyo.ac.jp/~ashra) at the Haleakala Observatory Site on Maui contimuously between 10:25 UT (1h7m before GRB041211) and 13:13 UT (1h41m after GRB041211) on 2004-12-11. The prototype unit utilizes a 11M-pixel CMOS sensor following a 0.4m diameter image intensifier on a modified Baker-Nunn optical system with 0.6m diameter pupil and 1.2m projected diameter spherical reflector for viewing a 50 degree circle region of sky. The achieved resolution is 2arcmin. We obtained about 2000 images covering the WXM error box of GRB041211 every 5s with 4s exposure time respectively. The sensitive region of wavelength is similar with the B-band. We detected no new objects in the WXM error box. As a result of our preliminary analysis of four sets of combined images, the following 3-sigma limiting magnitudes are derived: Time from GRB ExpTime Limit Mag. (s) (s) ---------------------------------------------------------------------- -1468 ~ 0 1175 11.3 0 ~ 100 80 11.0 100 ~ 1000 720 11.5 1000 ~ 4035 2428 11.3 ----------------------------------------------------------------------- Limiting magnitudes were estimated by comparison with stars in Tycho-2 Catalog. Figures of limiting magnitudes vs time and so on may be found at: http://www.icrr.u-tokyo.ac.jp/~ashra/GRB041211 This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2847 SUBJECT: GRB041211: RAPTOR observations DATE: 04/12/15 18:16:58 GMT FROM: Przemyslaw R. Wozniak at LANL P. Wozniak, J. Wren, W.T. Vestrand, and R. White, report on behalf of the RAPTOR team. Stereoscopic observations collected by the RAPTOR wide-field sky monitoring systems allow us to place optical limits on a prompt optical flash from GRB 041211 (HETE trigger 3622). Five seconds after receiving the initial HETE type 40 trigger, we began tiling around the nominal HETE pointing direction. Our first image containing the GRB location began at 11:34:09.93 UT (T+143.02s). This image was 10 seconds in duration and reached an unfiltered limiting magnitude of 11.5. No new object was detected within the error circle based on comparison to DSS image. Later images reaching 15th magnitude also showed no new objects compared to DSS images. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2848 SUBJECT: GRB041211: Continued P60 Observations DATE: 04/12/16 00:37:40 GMT FROM: S. Bradley Cenko at Caltech S. Bradley Cenko, Derek B. Fox, and Avishay Gal-Yam report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We have continued to monitor the SXC error circle of GRB041211 (H3622, Dezalay et. al., GCN 2839) with the robotic Palomar 60-inch telescope. We obtained 40 x 120-s I-band exposures on the evening of December 12 (mean time 07:37 UT, 19.9 h after the burst), followed by 20 x 120-s I-band images on the evening of December 13 (mean time 06:55 UT, 43.2 h after the burst). Digital subtraction revealed no variable source in the SXC error circle or its immediate surroundings. The limiting magnitude of our observations, estimated by comparison with the USNO-B1 catalog, is I < 23. No further observations are planned." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2852 SUBJECT: GRB041211: Faulkes Telescope continued optical monitoring DATE: 04/12/17 19:10:01 GMT FROM: Alessandro Monfardini at JMU/Liverpool Robotic Tele A. Monfardini, C. Guidorzi, C.J. Mottram, C. Mundell (Liverpool John Moores University) and the Liverpool GRB team, on behalf of the larger Robonet consortium, report: "We obtained late BVRI images of the SXC error box of GRB041211 (GCN 2839) with the 2-m Faulkes Telescope North on Maui. New observations began on December 15.549 UT (4.069 days after the GRB) under average seeing conditions. We compared 3x120 sec. R filter exposures with an early 120 sec exposure (GCN 2845). We found no significant variations or disappearances. We thus conclude: Time from GRB Time from GRB ExpTime Filter Limit Mag. (days) (hours) (s) --------------------------------------------------------------- 0.140 3.36 120 R > 21.5 The probability of chance positional coincidence with a field star has been estimated to be approximately 0.06. The above limit magnitude has been derived using the calibration provided by Henden et al. (GCN 2844)." This message can be cited.