//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1682 SUBJECT: GRB021112 (=H2448): A Long GRB Localized by HETE DATE: 02/11/12 15:54:15 GMT FROM: George Ricker at MIT GRB021112 (=H2448): A Long GRB Localized by HETE E. Fenimore, Y. Shirasaki, C. Graziani, M. Matsuoka, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, M. Galassi, T. Tavenner, T. Donaghy, Y. Nakagawa, D. Takahashi, M. Suzuki, R. Satoh, and Y. Urata, on behalf of the HETE WXM Team; G. Ricker, J-L Atteia, N. Kawai, D. Lamb, and S. Woosley on behalf of the HETE Science Team; N. Butler, G. Crew, J. Doty, G. Prigozhin, R. Vanderspek, J. Villasenor, T. Cline, J. G. Jernigan, A. Levine, F. Martel, E. Morgan, 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; write: At 03:28:15.89 UTC (12495.89 s UT) on 12 Nov 2002, the HETE FREGATE and WXM instruments detected event H2448, a long GRB. Ground analysis of the WXM data for the burst produced a location which was reported in a GCN Position Notice at 04:49 UT, 81 minutes after the burst. Further ground analysis of the WXM data produced a refined location, which was reported in a second GCN Position Notice at 05:29 UT. At the time that the second GCN Position Notice was issued, we noted that a transcription error had resulted in an error of 1 degree in the value of the declination cited in the 04:49 UT Notice. The WXM localization SNR was 4. The refined WXM ground location can be expressed as a 90% confidence circle that is 20 arcminutes in radius and is centered at RA = +02h 36m 52s, Dec = +48d 50' 56" (J2000). The burst duration in the 8-40 keV band > 5s. In the 8-40 keV band, the burst duration was > 3s, and the peak flux was > 3 x 10-8 ergs cm-2 s-1 (ie > 1 x Crab flux). In the 25-400 keV band, the burst duration was > 4s. A light curve for GRB021112 is provided at the following URL: http://space.mit.edu/HETE/Bursts/GRB021112/ This message is citable. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1684 SUBJECT: GRB 021112: R-band search DATE: 02/11/12 21:50:55 GMT FROM: Andrew Levan at U.of Leicester A.J. Levan (Leicester), J.J. Kavelaars (HIA/NRC) and J.E Rhoads (STScI) report for a larger collaboration. The error box of GRB 021112 (GCN 1682) was imaged with the KPNO-4m using the Mosaic imager beginning on November 12th 06:43 UT (3.25 hours after burst). Four R-band images were obtained dithered to cover the entire HETE-2 error circle. Most of the area was covered by all four exposures, yielding a net total exposure time of 1680s. Visual comparison of the stacked image with the DSS-2 (R-band) reveals no obvious new sources. Further observations are planned. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1685 SUBJECT: GRB 021112: Optical Observations DATE: 02/11/13 00:16:11 GMT FROM: Melissa Nysewander at UNC,Chapel Hill J. Schaefer, S. Savage, R. Canterna (U. Wyoming), M. Nysewander, and D. Reichart (U. North Carolina) report: We observed the inner 90% of the 40-arcminute diameter error circle of GRB 021112 (GCN 1682) with the 0.6-meter Red Buttes Observatory telescope beginning 1.8 hours after the burst. We integrated without filter for 1800 seconds per pointing x four pointings. Visual comparison with the DSS2-Red reveals no obvious counterpart to the limiting magnitude of the DSS. [GCN OPS NOTE (13nov02): The Circ 1683 reference was changed to 1682.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1689 SUBJECT: GRB 021112: RAPTOR Observations DATE: 02/11/13 23:21:48 GMT FROM: James Wren at LANL J. Wren, W. T. Vestrand, K. Borozdin, S. Brumby, D. Casperson, M. Galassi, K. McGowan, D. Starr, R. White, and P. Wozniak report: One of our RAPTOR (RAPid Telescopes for Optical Response) wide-field telescope arrays responded to the HETE-2 alerts for GRB 021112 (trigger #2448). That array, located in Los Alamos, New Mexico, is composed of four Canon 85 mm f1.2 telephoto lenses, which together image approximately 1300 squares degrees, and a central "fovea" telescope employing a 400 mm f2.8 Canon telephoto lens that images a central 16 square degree field. An unfiltered Apogee AP-10 CCD camera is located at the focal plane of each telescope. Mosaic imaging of the HETE-2 field-of-view began at 3:29:01 UTC, just 45.4 s after the GRB trigger. All of the images of the burst location taken before the GRB position was released place the location of the burst just 100 pixels from the edge of the imager where vignetting causes a significant loss of sensitivity. The image sensitivity was further reduced by thin cirrus clouds which were apparent in all of the early images. No new objects were detected within the HETE-2 error circle after comparison with archival images. The following limits were obtained for the initial response images: Exposure Time since Exposure Limiting Imager start time trigger duration Magnitude (UTC) (minutes) (seconds) (5 sigma) --------------------------------------------------------------- 3:29:56 1.67 5 11.4 wide-field 3:32:49 4.55 30 11.7 wide-field 4:49:44 81.46 30 14.6 fovea This message is citable. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1695 SUBJECT: GRB021112: Optical Observations DATE: 02/11/15 21:31:17 GMT FROM: Don Lamb at U.Chicago P. R. Newman, D. Q. Lamb, D. L. Tucker, S. Allam, B. C. Lee, D. E. Vanden Berk, M. Harvanek, A. N. Kleinman, S. Kleinman, J. Krzesinski, D. Long, and S. Snedden, on behalf of the SDSS GRB team, report: We have observed the field of GRB021112 (=H2448) (E. Fenimore et al., GCN 1682) using the SDSS 0.5-m "Photometric Telescope" (PT) at APO under clear skies and poor seeing on UTC 2002 November 12 from 07:51 to 10:20 UTC, beginning less than 4.4 hours after the burst. We took a series of five 500-second g'-band exposures and five 500-second r'-band exposures (41.5' x 41.5' field of view), each of which covers the entire refined HETE error circle for GRB021112. Visual comparison of the r'-band images with the DSS-2 (R band) reveals no new object, confirming the result reported by A. J. Levan et al. (GCN 1684). This message is citable. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1696 SUBJECT: GRB 021112: Variable Source in R-band search DATE: 02/11/18 22:49:28 GMT FROM: James Rhoads at STScI L. Strolger, J. E. Rhoads, A. Fruchter, I. Burud (STScI); A. J. Levan (Leicester), and J. J. Kavelaars (McMaster) report. In follow-up to our observations reported in GCN 1684, additional observations of the GRB 021112 error box (GCN 1682) were made using the KPNO-4m + Mosaic I imager on UT 2002 November 13.2. Four R-band images were obtained dithered to cover the entire HETE-2 error circle, for a combined exposure time of 1680s. Further detailed analysis of the field, including localized registration, PSF-matching, and subtraction of the combined observations made Nov. 12.3 from the combined observations made Nov. 13.2 have revealed a candidate optical transient (OT) located just outside the HETE-2 90% error circle, at RA: 02:38:27.80 Dec: +48:33:18.4 (J2000.0) Coordinates and offsets from neighboring stars were determined from direct comparison to the DDS-2 (R-band). A source is visible at the limit of the DDS-2 red plate at the position of the variable object. PSF photometry performed on the candidate OT and 5 neighboring stars have shown the object apparently brightened by 0.55 +/- 0.03 magnitudes between the observations made on Nov. 12.3 and Nov 13.2. Further information summarizing the discovery and analysis can be found on http://www.stsci.edu/~fruchter/GRB/021112/ . An approximate photometric zero point (based only on the typical throughput for the camera) gives R=21.1 on Nov 12.3 and R=20.6 on Nov. 13.2. Local reference star magnitudes are given on the above web page to facilitate comparison with other data. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1697 SUBJECT: GRB021112, BVRI field photometry DATE: 02/11/19 02:56:54 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired shallow BVRcIc all-sky photometry for a 20x20 arcmin field centered about 7arcmin north and 7 arcmin west of the position of the variable source mentioned in Strolger et al. (GCN1696), but within the error box for GRB021112 (Fenimore et al.,GCN1682), using the USNOFS 1.0-m telescope on one marginal night. Stars brighter than V=13.0 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/grb021112.dat The astrometry in this file is based on linear plate solutions with respect to USNO-A2.0. While the night was photometric, there was poor and variable seeing due to a frontal passage. We estimate the present zeropoint errors to be about 0.03mag. If the variable source is confirmed to be the afterglow for GRB021112, we will extend the calibration with additional nights to guard against a systematic zeropoint error. You should check the dates on the .dat file prior to final publication to get the latest photometry. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1698 SUBJECT: GRB 021112, Radio Observations DATE: 02/11/19 17:59:03 GMT FROM: Dale A. Frail at NRAO D. A. Frail (NRAO), and E. Berger (Caltech) report on behalf of a larger collaboration: "We have used the VLA to observe a variable candidate located just outside of the HETE 90% error circle. There is no 8.46 GHz radio source at the position reported by Strolger et al. (GCN1696) to a limit of 100 microJy (3-sigma). No further observations are planned." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1701 SUBJECT: GRB 021112: Afterglow or Variable Star? DATE: 02/11/20 19:05:03 GMT FROM: Melissa Nysewander at UNC,Chapel Hill M. Nysewander, D. Reichart (U. North Carolina), A. Henden (USRA/USNO), G. G. Williams (MMTO/SAO), and M. Schwartz (Tenagra Observatories) report on behalf of a larger collaboration: We observed fields containing the candidate afterglow of GRB 021112 (GCN 1696) 4 days after the burst in BVRcIc, 6 days after the burst in Rc, and 7 days after the burst in H. Using the field calibration of Henden (GCN 1697) and 2MASS, we report preliminary photometry: Date Time Filter Magnitude Telescope Nov 16.2 4.0 days V 21.48 +- 0.08 90-inch Bok Nov 16.3 4.1 days B > 22.6 (3 sigma) 90-inch Bok Nov 16.3 4.1 days Ic 19.39 +- 0.09 32-inch Tenagra II Nov 16.3 4.1 days Rc 20.87 +- 0.07 32-inch Tenagra II Nov 18.3 6.1 days Rc 20.84 +- 0.06 1.0-meter USNO Nov 19.2 7.0 days H * 17.44 +- 0.17 1.55-meter USNO * 2MASS field not available. Calibration based on 2MASS Quicklook image and consequently caution is warranted. However, candidate is strongly detected: Internal errors are ~0.01 mag. Using the images of Strolger et al. (GCNs 1684, 1696), kindly provided by J. E. Rhoads, we have placed their photometry on the same photometric system: Date Time Filter Magnitude Telescope Nov 12.3 3.2 hours Rc 20.86 +- 0.05 4-meter Mayall Nov 13.2 1.0 days Rc 20.31 +- 0.06 4-meter Mayall Although we do not find evidence for variability in the R-band light curve outside of the discovery epoch, which could be explained by an afterglow in a R = 20.86 +- 0.03 galaxy, 1.0 arcsec seeing on Oct. 19th shows the candidate to have a star-like profile (this image is available upon request). This, in addition to the candidate's location outside of HETE's 90% error box and an otherwise rarely seen brightening a day after the burst, suggest that the candidate is probably a variable star of some type instead of an afterglow in a bright, compact galaxy. [GCN OPS NOTE (27Nov02): All the "Oct dd.dd" were changed to "Nov dd.d".] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1724 SUBJECT: GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations DATE: 02/12/06 18:41:04 GMT FROM: Julie McEnery at UMBC/GSFC Julie McEnery on behalf of the Milagro collaboration reports: Milagro searched for GeV/TeV gamma-ray emission from GRB 021104 (GCN 1675), GRB 021112 (GCN 1682) and GRB 021113 (GCN 1686) during the burst durations reported by the HETE WXM (26, 5 and 20 seconds respectively). No evidence for prompt GeV/TeV emission was found from any of these bursts. A preliminary analysis (assuming a differential photon spectral index of -2.4) gives an upper limit on the fluence at the 99.9% confidence level of: J(E 0.2-20 TeV) < 3.4 * 10^(-6) erg cm^(-2) for GRB 021104 and, J(E 0.2-20 TeV) < 2.6 * 10^(-6) erg cm^(-2) for GRB 021112 and, J(E 0.2-20 TeV) < 2.8 * 10^(-6) erg cm^(-2) for GRB 021113 //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1776 SUBJECT: GRB 021112: Evidence for Another Dark Optical Afterglow DATE: 02/12/22 00:16:58 GMT FROM: Melissa Nysewander at UNC,Chapel Hill J. Schaefer, S. Savage, R. Canterna (U. Wyoming), M. Nysewander, D. Reichart (U. North Carolina), A. Henden (USRA/USNO), and D. Lamb (U. Chicago) report on behalf of a larger collaboration: We observed the inner 93% of the 40-arcminute diameter error circle of GRB 021112 (GCN 1682) with the 0.6-meter Red Buttes Observatory telescope beginning 1.8 hours (GCN 1685) and 13.9 days after the burst. For the first epoch observation, we integrated without filter for 1800 seconds per pointing x four pointings. For the second epoch observation, we integrated without filter for 2700 seconds per pointing x four pointings. Unfiltered magnitudes measured with our Apogee AP8P CCD best mimic Rc magnitudes. Using the image subtraction routine ISIS2 (Alard 2000), we find no candidates to the limiting magnitude of our first epoch image, which we measure to be Rc = 21.8 mag (3 sigma), 22.2 mag (2 sigma), and 23.0 mag (1 sigma) using the field calibration of Henden (GCN 1697). We note that the Galactic extinction along this line of sight is approximately A_Rc = 0.52 mag (Schlegel et al. 1998). The candidate of Strolger et al. (GCNs 1684, 1696) sits outside of the above fields. In addition to the arguments presented by Nysewander et al. (GCN 1701), its BVRcIcH spectral flux distribution and low Galactic latitude suggest that it is a low-mass flare star. Dismissing this candidate, this is the deepest non-detection of an optical afterglow beginning within 2.6 hours of a burst (GCN 1699). Alard, C. 2000, A&AS 114, 363 Schlegel, D., et al. 1998, ApJ, 500, 525