//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3054 SUBJECT: GRB 050223: Swift XRT Position DATE: 05/02/23 05:20:33 GMT FROM: David Burrows at PSU/Swift P. Giommi, M. Capalbi, M. Perri, F. Tamburelli (ASDC), G. Cusumano, V. Mangano, V. La Parola (INAF-IASF/Palermo), D. N. Burrows, J. A. Kennea, J. A. Nousek (PSU), K. L. Page, M. R. Goad (U. Leicester), P. Romano, G. Tagliaferri, G. Chincarini (INAF-OAB), N. Gehrels (GSFC), B. Zhang (U. Nevada), report on behalf of the Swift XRT team: The Swift BAT instrument detected GRB 050223 at 03:09:06 UT on 23 Feb 2005. The GRB was located within the Earth angle constraint of the Narrow Field Instruments and the observatory was not able to slew to it at that time. Swift executed an automated slew to the BAT position at 03:44 UT while the observatory was in the SAA. The XRT began taking data at about 03:57 UT after exiting the SAA. The XRT was in Manual state and made observations in PCmode. We find an uncataloged X-ray source located at: RA(J2000) = 18h 05m 32.6s, Dec(J2000) = -62d 28' 19.7" We estimate an uncertainty of about 8 arcseconds. This position was generated using PSU processing software on 400 s of data. Once data become available at the SDC a more accurate refined position will be determined. This position is within 1.6 arcminutes of the BAT position. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3055 SUBJECT: GRB 050223 Swift/BAT detection of a burst DATE: 05/02/23 05:54:42 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift T. Mitani (ISAS), L. Barbier, S. Barthelmy, J. Cannizzo, J. Cummings (GSFC), M. Chester (PSU), E. Fenimore, M. Galassi (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), F. Marshall (GSFC), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC), G. Sato (ISAS), M. Suzuki (Saitama), T. Takahashi (ISAS), F. Tamburelli (ASDC), M. Tashiro (Saitama), J. Tueller (GSFC) At 03:09:06 UT, the Swift Burst Alert Telescope (BAT) triggered and located on-board GRB050223. Because of the Earth-limb constraint, the spacecraft could not immediately slew to the burst location. The location became unconstrained at T+35 min, and the spacecraft slewed. The XRT and UVOT instruments then began their standard set of pre-programmed observing sequences. Using the time interval of the burst, the ground-calculated location is RA, Dec 271.390, -62.481 (J2000) with an uncertainty of 4 arcmin (radius, including a systematic uncertainty, 90% containment). The burst was 36 degrees off the BAT boresight (70% encoding). The burst lightcurve has several small, short peaks on top of a slow rise and fall with a T90 duration of ~23 sec (and T50 is 10 sec). The peak flux is 0.8 ph/cm2/sec for a 1-sec interval (15-350 keV). Using a simple power law model, the fluence is 7.4 e-7 erg/cm^2 (15-350 keV). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3056 SUBJECT: GRB050223: ROTSE-III Optical Observations DATE: 05/02/23 06:33:25 GMT FROM: Don Smith at U michigan Title: GRB050223: ROTSE-III Optical Observations Smith, D. A. (U. of Michigan) reports on behalf of the ROTSE collaboration: ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia responded to Swift GRB 050223 (Trigger #106709). An automatic response resulted in a series of 97 images beginning 7.7 seconds after receipt of the GCN trigger under fair conditions. Some light clouds drifted through the field, but the images calibrated successfully. The first image began at 23 Feb 2005 03:10:07.74, 61.6 seconds after the burst. We took 10 5-second, 10 20-second and 67 60-s exposures. The images are unfiltered and were calibrated relative to USNO A2.0. At 18.8 degrees galactic latitude, the source is in a crowded field, and our limits are adversely effected by source confusion. Individual images have limiting magnitudes ranging from 16.4-17.1 (for longer exposures). Comparison to DSS (second epoch) reveals no new sources within the 3-sigma BAT error circle to a limiting magnitude of 18.0 for co-adds of 10 images taken up to 43 minutes after the burst. In particular, no new source is found at the location of the XRT source coordinates (Giommi et al., GCN Circ. No. 3054). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3057 SUBJECT: GRB050223: No Swift UVOT Detection of Afterglow Emission DATE: 05/02/23 09:00:57 GMT FROM: Patricia Schady at MSSL/Swift C. Gronwall (PSU), A. Blustin (MSSL), P. Brown (PSU), S. Rosen, K. McGowan, M. De Pasquale (MSSL), P. Boyd (GSFC/UMBC), S. Holland, M. Still (GSFC/USRA), W. Landsman (GSFC), S. Hunsberger (PSU), A. Breeveld (MSSL), P. Roming (PSU), K. Mason, P. Schady (MSSL), M. Ivanushkina (PSU), T. Poole, P. Smith, B. Hancock (MSSL), S. Koch (PSU), M. Carter, H. Huckle (MSSL), P. Broos (PSU), T. Kennedy (MSSL), J. Racusin (PSU), E. Fenimore (LANL), B. Zhang (UNLV), J. Nousek (PSU), N. Gehrels (GSFC), on behalf of the Swift UVOT team. The Swift Ultra-Violet/Optical Telescope (UVOT) began observations of GRB050223 at 03:55:28 UT on 23 Feb 2005, about 46:22 UT after the initial Swift Bat trigger (Mitani et al, GCN 3055). The delay in observations was due to the Earth-limb constaint, which prevented an immediate slew. We detect no source in the intial 100s exposure at the Swift XRT position (Giommi et al, GCN 3054). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3058 SUBJECT: GRB 050223 : Planned XMM-Newton observation DATE: 05/02/23 11:27:55 GMT FROM: Norbert Schartel at XMM-Newton/ESA XMM-Newton will observe GRB 050223 at location (RA=18h 05m 32.6s, DEC=-62d 28' 20", J2000), starting at 12:45:00 UT, on February 23, 2005, for an exposure of 60000 seconds. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3059 SUBJECT: INTEGRAL detection of GRB 050223 DATE: 05/02/23 13:44:54 GMT FROM: Sandro Mereghetti at IASF/CNR S. Mereghetti, D. Gotz (IASF, Milano), N. Mowlavi, S. Shaw, M. Beck (ISDC, Versoix) and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: GRB 050223, discovered by Swift (Giommi et al. GCN 3054, Mitani et al. GCN 3055), has been also detected by the IBIS/ISGRI instrument on board INTEGRAL. The burst occurred during a 200 sec long time interval in which the automatic distribution of IBAS Alerts was disabled due to the temporary switch-off of one of the 8 modules of the IBIS/ISGRI detector. The GRB coordinates (J2000) derived from an off-line analysis are: RA: 271.4002 [degrees] DEC: -62.4739 [degrees] with an uncertainty of 3 arcmin (90% c.l. radius). The peak flux measured with IBIS/ISGRI is 0.6 ph/cmsq/s (20-200 keV, 1 s integration time). This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3060 SUBJECT: GRB050223 XMM-Newton observation DATE: 05/02/23 16:41:03 GMT FROM: Norbert Schartel at XMM-Newton/ESA R. Gonzalez-Riestra, M. Santos-Lleo, P. Rodriguez-Pascual and P. Munuera report: Quick-Look-Analysis of the XMM-Newton observation of the GRB050223 field based on a 5ks exposure in the EPIC pn camera that started at 13:57 UT, shows the presence of a source within the SWIFT/XRT error circle (Giommi et al., GCN 3054). XMMU J180532.5-622821 (J2000): R.A. = 18h 05m 32.5s Decl. = -62deg 28' 21'' with an estimated EPIC/pn count rate of 0.03 counts/sec; At this stage of data reduction the position error is expected to be less than 5''. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3061 SUBJECT: GRB 050223: optical observations DATE: 05/02/23 18:54:22 GMT FROM: Javier Gorosabel at LAEFF-INTA, Madrid J. Gorosabel (IAA-CSIC, Granada), S. Eguchi (Stelab, Nagoya Univ.), A. de Ugarte Postigo (IAA-CSIC), Ph. Yock (Univ. of Auckland) and A.J. Castro-Tirado (IAA-CSIC), report: "Following the detection by SWIFT of GRB 050223 (Mitani et al. GCN Circ. 3055) we imaged the error box with the 0.6 m telescope at Mt. John Univ. Observatory. We obtained a 300s image with the MOA camera (+wide R-band filter) under poor seeing conditions (4") starting on 23.55 Feb UT (i.e. 10.05 hr after the event). A finding chart can be found at: http://www.iaa.es/~deugarte/GRBs/050223/T1143-grb050223-red-2.gif Comparison of the R-band image with the DSS-2 revealed neither counterpart within the 5" radius X-ray afterglow position given by XMM-Newton (Gonzalez-Riestra et al. GCN Circ. 3060) nor variable source to about R = 20.5 within the 4' radius SWIFT/BAT error box." This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3065 SUBJECT: XMM-Newton Images of GRB 050223 DATE: 05/02/28 15:46:53 GMT FROM: Norbert Schartel at XMM-Newton/ESA P. Rodriguez from the XMM-Newton SOC report: Preliminary EPIC-pn images, light-curves and spectra from the XMM-Newton observation of the field of GRB 050223 are available at the home-page of the XMM-Newton Science Operations Centre: http://xmm.vilspa.esa.es/external/xmm_news/items/grb050223/index.shtml //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3067 SUBJECT: PROMPT VRcIc Observations of GRB 050223 DATE: 05/03/01 05:38:41 GMT FROM: Melissa Nysewander at UNC,Chapel Hill M. Nysewander, M. Bayliss, J. Haislip, P. Price (Hawaii), C. MacLeod, J. Kirchbrown, D. Moschler, A. Foster, D. Reichart, O. Awam, A. Davis, M. Greco, D. Kumar, T. Mack, A. Mann, B. Russ, C. Owen, and J. Phelps report on behalf of the UNC team of the FUN GRB Collaboration: We observed the 8 arcsecond position of the uncataloged x-ray source found by the Swift XRT instrument (Giommi et al., GCN 3054) in the field of GRB 050223 with three telescopes of the PROMPT robotic telescope array located at CTIO. Manual observations first began in V 2.5 hours after the burst at high airmass and no new sources were observed to the limiting magnitude of a single exposure. Observations continued in Rc and Ic and details are given below. PROMPT filter exposures start mean 2s limiting # time (hr) time (hr) magnitude 1 Rc 20x90s, 120x60s 2.8 4.1 21.2 3 V 130x90s 2.5 4.2 21.3 5 Ic 60x90s 4.3 5.1 21.1 times are given in hours after the burst (03:09:06 UT). Limiting magnitudes were calculated using 2 NOMAD stars for V, and 5 USNO-B1.0 stars for Ic and Rc. An overview of PROMPT can be found at astro-ph/0502429. The project is still in the building/commissioning phase with only three telescopes currently online. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3093 SUBJECT: GRB050223: No XMM-Newton OM detection of afterglow emission DATE: 05/03/15 19:35:46 GMT FROM: Alexander Blustin at MSSL-UCL A. Blustin (MSSL), G. Branduardi-Raymont (MSSL), A. Breeveld (MSSL), C. Brocksopp (MSSL), M. Cropper (MSSL), C. James (MSSL), N. Loaring (MSSL), K. Mason (MSSL), K. McGowan (MSSL), M. de Pasquale (MSSL), M. Page (MSSL), T. Poole (MSSL), G. Ramsay (MSSL), S. Rosen (MSSL), C. Saxton (MSSL), P. Schady (MSSL), K. Wu (MSSL), S. Zane (MSSL), H. Ziaeepour (MSSL) on behalf of the XMM-Newton Optical Monitor team The XMM-Newton Optical Monitor began observations of GRB050223 at 14:23:15 on 2005-02-23, about 11 hours after the initial Swift BAT trigger (Mitani et al, GCN 3055). We detect no source at the position of the XMM-Newton pn source (Gonzalez-Riestra et al, GCN 3060). The estimated limiting magnitudes (5-sigma) in each of the OM filters are as follows: Filter Lim_Mag Duration T_start B 21.22 4000 T+40449 UVW1 20.24 2500 T+60374 UVW1 20.49 4000 T+63181 UVM2 19.60 4000 T+67488 UVM2 19.56 4000 T+71795 UVW2 18.70 4000 T+76102 UVW2 18.67 4000 T+80409 UVW2 18.64 4000 T+84716 This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3109 SUBJECT: GRB050223: analysis of the XMM-Newton observation DATE: 05/03/17 18:25:00 GMT FROM: Andrea De Luca at IASF-CNR,Milano A. De Luca (IASF-Mi), S. Campana (OAB) on behalf of a larger collaboration report: We have analyzed the data from the XMM-Newton observation of GRB050223, discovered by Swift on 2005, Feb 23, 03:09:06 UTC (Giommi et al., GCN3054). The XMM-Newton observation started on 2005, Feb. 23 at 13:04 UT and ended on 2005, Feb 24 at 06:14:20, with a gap between Feb. 23 16:54 UT and Feb. 23 18:56 UT due to a ground station outage. A first account of results, based on the analysis of preliminary data, have been presented by the XMM-Newton SOC team (http://xmm.vilspa.esa.es/external/xmm_news/items/grb050223/index.shtml). Observation Data Files have been produced and released only for the part of the observation starting from Feb. 23 18:55:57 UT (after the gap) and lasting for 41 ks. The whole observation is badly affected by low-energy particle background, dramatically reducing the signal to noise, especially in the data from the back-illuminated pn detector, which is particularly sensitive to such background component. This hampers a detailed study of the spectral and temporal phenomenology of the faint source XMMU J180532.5-622821 (Gonzalez-Riestra et al., GCN 3060), the likely afterglow of GRB050223. As a first step, we improved the astrometry of the XMM-Newton/EPIC images by matching X-ray sources in the field to bright stars in the USNO-B1 catalogue. The refined position (J2000) for the X-ray afterglow is RA: 18h 05m 32.49s Dec: -62d 28' 21.07" The 1 sigma error radius is 1.5 arcsec (including the rms error on the cross-correlation as well as systematic uncertainties in the optical catalogue). The position is fully consistent with the XRT coordinates (Giommi et al., GCN 3054) as well as with the preliminary XMM-Newton position by Gonzalez-Riestra et al. (GCN 3060). The EPIC light curve in the 0.5-2 keV range (where the signal-to-noise is maximum) shows hints that the source is fading, following a power law decay with index in the range 0.5-3 (90% confidence level). We extracted time-averaged spectra from the three EPIC cameras and we generated ad-hoc response and effective area files. A slightly absorbed (NH<10^21 cm^-2, consistent with the Galactic column density in this direction, 7x10^20 cm^-2) power law model with photon index 1.6(+0.6,-0.4) gives an acceptable description of the data in the 0.3-4 keV range, with a reduced chi2 of 1.5 (32 d.o.f). The quoted errors are at 90% conf. level for a single interesting parameter. The not optimal quality of the fit is most likely due to the heavy background affecting the observation. The observed flux (0.2-10 keV) is of ~3.7x10^-14 ergs cm^-2 s^-1; the corresponding unabsorbed flux is ~4x10^-14 ergs cm^-2 s^-1. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5268 SUBJECT: GRB050223: Host Galaxy DATE: 06/06/16 20:57:59 GMT FROM: Leonardo Pellizza at CEA/Saclay L.J. Pellizza (CEA Saclay, France & IAFE, Argentina), P.-A. Duc (CEA Saclay, France), E. Le Floc'h (Steward Obs., USA), & I.F. Mirabel (ESO), on behalf of the MISTICI collaboration. We imaged the field of GRB 050223 (Mitani et al. 2005, GCN 3055) on May 10, 2005 and June 5, 2005. R (10 x 308 seconds) and Ks (42 x 60 seconds) frames were obtained respectively with FORS1 and ISAAC at VLT. In the combined R and Ks images we detect a single galaxy within the revised XRT error circle (Moretti et al. 2006, A&A, 448, L9), down to our limiting magnitudes R_lim ~ 26 and Ks_lim ~ 21. Its position is RA(J2000) = 18:05:32.99, DEC(J2000) = -62:28:18.8 (0.2 arcsec error), We measured R = 21.6 and Ks = 18.9 for this object (with an uncertainty of ~0.1 mag). Astrometry was performed using USNO B1.0 stars, while photometry was calibrated against 2MASS and USNO B1.0 (second epoch) magnitudes. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5283 SUBJECT: GRB 050223: Magellan redshift DATE: 06/07/03 21:31:23 GMT FROM: Edo Berger at Carnegie Obs E. Berger (Carnegie) and Min-Su Shin (Princeton) report: "We obtained spectroscopic observations of the host galaxy of GRB 050223 (GCN 5268) with the LDSS-3 spectrograph on the Magellan/Clay telescope on 2006 June 28 UT. We find a single emission line at an observed (vacuum-corrected) wavelength of 5933.8A, corresponding to [OII]3727 at a redshift z=0.5915. At this redshift, the observed brightness of the host, R=21.6 mag (GCN 5268), corresponds to an absolute magnitude, M_B=-20.2 mag or ~0.5L*. We further detect an emission line at the same wavelength from a galaxy about 1.3 mag fainter located 10" to the east of the host galaxy, indicating that it is a companion to the host with a separation of about 65 kpc and a luminosity of about 0.15L*. At the redshift of the host and with a fluence of 9.7e-7 erg/cm^2 (Page et al. 2005, MNRAS, 363, L76), the isotropic-equivalent gamma-ray energy of GRB 050223 is only 8.7e50 erg."