//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1188 SUBJECT: BeppoSAX Alert: GRB011211(=XRF011211) DATE: 01/12/12 00:31:47 GMT FROM: Giangiacomo Gandolfi at IAS/CNR Frascati BeppoSAX Alert: GRB011211(=XRF011211) On Dec. 11, 19:09:21 UT an X-ray rich GRB (XRF011211) has been detected in BeppoSAX WFC1 Preliminary coordinates are: R.A.(2000)= 168.812 DEC.(2000)= -21.935 The error radius at this stage of analysis is 5'. Giangiacomo Gandolfi on behalf of BeppoSAX Mission Scientist //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1189 SUBJECT: GRB011211(=XRF011211): BeppoSAX refined positions DATE: 01/12/12 02:20:11 GMT FROM: Giangiacomo Gandolfi at IAS/CNR Frascati GRB011211(=XRF011211): BeppoSAX refined positions Refined coordinates from WFC are: R.A.(2000)= 168.818 DEC.(2000)= -21.929 The error radius is 2'. Giangiacomo Gandolfi on behalf of BeppoSAX Mission Scientist //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1191 SUBJECT: GRB 011211 Optical Observations: Likely Afterglow DATE: 01/12/12 10:15:57 GMT FROM: Jens Hjorth at U.Copenhagen T. Grav, M. W. Hansen (U. of Oslo), H. Pedersen, J. Hjorth, R. Michelsen, B. L. Jensen (U. of Copenhagen), M. I. Andersen (U. of Oulu), J. Gorosabel (DSRI), J. U. Fynbo (ESO) report: We have obtained optical follow-up observations of the SAX error circle of GRB 011211 (cf. GCN ##1188,1189) with the ALFOSC on the 2.56-m NOT and with DFOSC on the Danish 1.5m on La Silla starting at about 12.2 December 2001 UT. In R-band images a new point source, not visible in the DSS-2 (red), is detected at RA (J2000) = 11:15:17.98, Dec(J2000) = -21:56:56.2 with an estimated error of +- 1". The magnitude is about R = 19. Given the proximity to the refined SAX WFC position and its absence in DSS, the source is likely the afterglow of GRB 011211. The above findings are preliminary. More details will be reported later. Images will be made available at http://www.astro.ku.dk/~brian_j/grb/grb011211 //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1192 SUBJECT: XMM-Newton observation of GRB011211 DATE: 01/12/12 11:01:15 GMT FROM: Norbert Schartel at XMM-Newton/ESA M. Santos-Lleo, N. Loiseau, P. Rodriguez, B. Altieri, and N. Schartel report: QLA (Quick-Look-Analysis) analysis of the XMM-Newton observation of GRB011211 (G. Gandolfi et al. GCN 1188 and 1189) shows the presence of a source in the WFC error box: S1 (J2000): R.A. = 11h 15m 17.9s Decl. = -21 56' 57.5" with an estimated EPIC/pn countrate of 0.02 [counts/sec]. At this stage of reduction the error is expected to be less than 10". Refined coordinates will be distributed as soon as the final attitude reconstruction is obtained. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1193 SUBJECT: Fading of the optical source associated of XRF 011211 DATE: 01/12/12 12:48:54 GMT FROM: Josh Bloom at CIT Fading of the optical source associated of XRF 011211 J. S. Bloom and Edo Berger report on behalf of the larger Caltech-NRAO-CARA GRB Collaboration: "Following the report of a new bright source (Grav et al. GCN #1191) in the field of XRF 011211 (Gandolfi et al. GCN #1188, GCN #1189; Santos-Lleo et al. GCN #1192) we began observing the source position with the Palomar 200" + JCAM dual-band optical imager on 12 Dec 01, 10:48 UT in very poor observing conditions. In Sloan-r', the source is clearly fainter than the three objects to the northwest (the source plus the three objects appear to be of comparable brightness on the Grav et al. finding chart). This confirms the transient nature of the source discovered by Grav et al. and helps solidify its association with XRF 011211. The source was also detected the Sloan g' filter, suggesting an origin z <~ 4.3. A finding chart with a single g' and r' integration (110s and 100s exposure) may be found at: http://www.astro.caltech.edu/~jsb/xrf011211.gif This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1195 SUBJECT: GRB 011211: BVRi-band photometry DATE: 01/12/12 15:54:51 GMT FROM: Brian Lindgren Jensen at U.of Copenhagen B. L. Jensen, H. Pedersen, J. Hjorth, R. Michelsen (U. of Copenhagen), T. Grav, M. W. Hansen (U. of Oslo), J. U. Fynbo (ESO), M. Weidinger (U. of Aarhus), M. I. Andersen (U. of Oulu) and J. Gorosabel (DSRI) report: "We have performed aperture photometry of the afterglow candidate for GRB 011211 reported in GCN#1191 (Grav et al.), and obtain the following results based on a preliminary photometric calibration: For USNO-star U0675_11427359 at RA,Dec (J2000) = (11:15:19.00, -21:58:04.9) we obtain: I = 17.07, R = 17.90, V = 18.18, B = 18.65 For the afterglow candidate we measure: Tel. Date (UT) exp filter mag. ========================================= NOT-2.5m Dec.12.22 900s R 20.07 NOT-2.5m Dec.12.28 300s B 21.41 NOT-2.5m Dec.12.28 300s g-i 20.09 NOT-2.5m Dec.12.29 300s V 21.14 DK-1.5m Dec.12.28 4200s R 20.12 DK-1.5m Dec.12.36 300s V 21.21 Conservative errors on the absolute photometry is ~0.15 mag, due to lack of precise calibration. Errors relative to the USNO-star are around a few percent. Further images will be made available at http://www.astro.ku.dk/~brian_j/grb/grb011211 " //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1197 SUBJECT: GRB011211, BVRI field photometry DATE: 01/12/13 17:22:44 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 an 11x11 arcmin field that is approximately centered on the position of the candiate optical transient reported by Grav et al. (GCN 1191) with the USNOFS 1.0-m telescope on one photometric (but poor seeing) 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/grb011211.dat The current photometry has a potential external zero-point error of about two percent. The astrometry in this file is based on linear plate solutions with respect to USNO-A2.0. The internal errors are less than 100mas. In particular, the comparison star U0675_11427359 that was used to calibrate their field can be found in the .dat file with the following magnitudes: B = 18.65 V = 18.11 R = 17.76 I = 17.42 with estimated photometric errors of about 4 percent, including the zeropoint errors quoted above. Further calibration of this field will be performed when weather conditions improve. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1199 SUBJECT: GRB 011211, Optical Observations DATE: 01/12/13 19:18:54 GMT FROM: Stephen Holland at U. of Notre Dame GRB 011211, Optical Observations I. Soszynski (Warsaw University Observatory), S. Holland, P. M. Garnavich (Notre Dame) D. Bersier, S. Jha, K. Z. Stanek (Harvard-Smithsonian Center for Astrophysics), We have obtained deep VRI images of the field containing GRB 011211 using the OGLE 1.3-metre telescope (using the 8k x 8k OGLE-III mosaic) at the Las Campanas Observatory on Dec. 12 and Dec. 13 UT. The optical afterglow of GRB 011211 (Grav et al. 2001, GCN 1191) is visible on all of our images. We performed PSF photometry on each image and calibrated data using the VRI magnitudes for USNO star U0675_11427359 given by Henden (2001, GCN 1197). Preliminary magnitudes, relative to the USNO star, are: Band Date Start UT Mag err Exptime(s) ----------------------------------------------- V Dec 12 07:16:02 20.79 0.05 600 V Dec 13 06:19:28 21.71 0.09 600 R Dec 12 05:55:55 20.10 0.08 180 R Dec 12 06:04:34 20.41 0.04 600 R Dec 12 06:33:59 20.43 0.05 600 R Dec 12 06:59:04 20.35 0.03 600 R Dec 12 07:39:27 20.40 0.04 600 R Dec 13 05:43:15 21.48 0.11 600 R Dec 13 08:09:13 21.52 0.07 600 I Dec 12 06:18:16 19.95 0.06 600 I Dec 12 06:47:12 19.92 0.07 600 I Dec 12 07:27:46 19.96 0.05 600 I Dec 12 07:51:13 20.10 0.06 600 I Dec 13 06:03:48 20.80 0.11 600 I Dec 13 08:23:44 20.94 0.12 600 The quoted uncertainties are internal errors only and do not include uncertainties in the calibration of the USNO star. The frame-to-frame variation in several stars located near the optical afterglow and the USNO star is approximately 0.03 mag. The optical afterglow faded by approximately one mag between approximately Dec. 12.3 and Dec. 13.3 in each of the V, R, and I bands. The decays are well fit by single power laws with slopes of -0.80 +/- 0.12 in the V band, -0.93 +/- 0.06 in the R band, and -0.74 +/- 0.08 in the I band. If we include the V and R data from Jensen et al. (2001, GCN 1195) the slopes change by less than one sigma. We see no evidence for a break in the light curve. A plot of the VRI light curves and the best-fitting single power laws is available at "http://www.nd.edu/~sholland/grb/grb011211/ogle_fit.eps". We do not detect any evidence for a host galaxy at the location of the proposed optical afterglow. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1200 SUBJECT: GRB 011211: Optical Spectroscopy DATE: 01/12/13 20:19:00 GMT FROM: Andrew S. Fruchter at STScI A. Fruchter (STScI), P. Vreeswijk (A'dam), J. Rhoads, and I. Burud (STScI) report for a larger collaboration: We have observed the optical counterpart of GRB (XRF) 011211 (GCN 1188, 1191) using the FORS2 spectrograph on the Yepun (VLT4) 8-m telescope of the European Southern Observatory. We find an absorption line system corresponding to a redshift of z=2.14 superposed on the continuum emission. Hydrogen Lyman alpha, as well as the absorption lines of several metals including C, Fe and Si, are clearly detected. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1202 SUBJECT: optical follow-up of GRB(XRF) 011211 DATE: 01/12/14 10:02:42 GMT FROM: SG Bhargavi at Indian Inst of Astrophysics SG Bhargavi & R cowsik (IIA, Bangalore) report: The afterglow of GRB(xrf) 011211 [GCN 1188,1191] was observed under clear sky conditions using the 2.34m as well as 1-m telescopes at VBO, kavalur. on 12th and 13th Dec, 2001 Aperture photometry using USNO star (Jensen et al, GCN-1195) for some of the (VBT )images follows : Dec 12.9006 R 600s 20.77 \pm 0.06 dec 12.9403 V 1200s 21.595 \pm 0.06 dec 12.9819 B 1800s 22.072 \pm 0.09 dec 12.9979 R 600s 21.125 \pm 0.08 this message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1203 SUBJECT: GRB 011211: TNG Spectroscopic Observations DATE: 01/12/14 18:45:21 GMT FROM: Angelo Antonelli at Obs. Astro. di Roma F. Fiore, G.L. Israel, L.A. Antonelli, L. Stella (OA Roma), S. Covino, P. Saracco, G. Ghisellini (OA Brera), A. Buzzoni, T. Oliva (TNG), E. Pian (OA Trieste), E. Palazzi, N. Masetti (ITeSRe, CNR, Bologna) on behalf of a larger collaboration, report: "Spectra of the OT (Grav et al.: GCN #1191) of GRB011211 in the 350-750nm range (total exposure time of about 1hr) were obtained with the 3.5m Telescopio Nazionale Galileo (TNG) equipped with DOLORES + grism #1 on Dec. 13.27 (UT). The source was relatively faint, V~21.7, and the signal to noise of our spectra does not allow the detection of faint absorption lines. The continuum is peaked in the blue band, and consistent with the V-R of 0.2 measured by Soszynski et al. (GCN #1199) at the time of the TNG observation. A break is evident shortward of about 400nm which may be interpreted as Lyman-alpha forest blanketing at a redshift of about z=2.1, consistent with that reported by Fruchter et al. (GCN #1200). Further analysis is in progress. This message may be cited." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1204 SUBJECT: GRB 011211: Evidence for an Optical Break DATE: 01/12/14 22:09:28 GMT FROM: Stephen Holland at U. of Notre Dame GRB 011211: Evidence for an Optical Break S. Holland (Notre Dame), P. Berlind, D. Bersier, S. Jha, K. Z. Stanek (Harvard-Smithsonian Center for Astrophysics), I. Soszynski (Warsaw University Observatory), P. M. Garnavich (Notre Dame) report: We have obtained deep VRI images of the field containing GRB 011211 using the 1.2-meter telescope with the 4Shooter at the Fred Lawrence Whipple Observatory on Dec. 14.5 UT. The optical afterglow of GRB 011211 is not visible on any of our images. The predicted magnitudes, based on the power-law fits of Soszynski et al. (2001, GCN 1199), and the estimated limiting magnitudes of our images are give below. Filter Predicted Limiting Magnitude V 22.10 22.3 +/- 0.2 R 21.99 22.4 +/- 0.2 I 21.25 21.0 +/- 0.2 These magnitudes are relative to the VRI magnitudes for USNO star U0675_11427359 given by Henden (2001, GCN 1197). Our non-detection suggests that there has been a break in the light curve of the optical afterglow of GRB 011211. The break occurred between 1.5 and 2.7 days after the burst (between Dec. 13.3 and Dec. 14.5). The R-band limiting magnitude suggests that the slope after the break is at least -1.4. The V- and I-band limiting magnitudes are consistent with no break. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1209 SUBJECT: GRB 011211, spectrum and optical photometry DATE: 01/12/18 18:32:08 GMT FROM: Peter Garnavich at U of Notre Dame M. Gladders (OCIW), S. Holland, P. M. Garnavich (Notre Dame), S. Jha, K. Z. Stanek, D. Bersier (CfA), L. F. Barrientos (U. Catolica) Spectra of the candidate afterglow of GRB 011211 (Grav et al. GCN 1191) were obtained with the Magellan 6.5m Walter Baade telescope and LDSS-2 imaging spectrograph on 2001, Dec. 13.3 (UT). The spectra cover the range 400 nm to 900 nm at a resolution of 1.2 nm (FWHM). Four exposures, each with an exposure time of 620s, were fully reduced and combined. The final spectrum shows a smooth continuum except for a number of narrow absorption lines in the blue. Observed ID z -------- --------- ---- 524.8 nm Al II (167.1) 2.141 486.5 C IV (154.9) 2.141 479.4 Si II (152.7) 2.140 439.3 Si IV (139.8) 2.142 409.1 O I/Si II (130.3) 2.140 A broad, unidentified feature is seen at 460.0 nm (146.5 nm rest frame). These identifications confirm the redshift of z=2.14 found by Fruchter et al. (GCN 1200). R-band images were also obtained in imaging mode on Dec. 12 and 13 (UT). Assuming R=17.76 U0675_11427359 given by Henden (2001, GCN 1197) we find the following magnitudes for the probable afterglow: Dec. 12.25 20.28 +/-0.02 Dec. 12.34 20.58 +/-0.02 Dec. 13.31 21.46 +/-0.04 which provide a power law index of 0.9, consistent with the optical decline rates found by Soszynski et al. (GCN 1199) for the same time interval. The fits images and spectra are available at http://www.astro.utoronto.ca/~gladders/GRB/ This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1211 SUBJECT: Color indices of the afterglow of GRB011211 DATE: 01/12/21 16:15:29 GMT FROM: Graziella Pizzichini at TESRE/CNR V. Simon, R. Hudec (Astronomical Institute AV CR, Ondrejov) and G. Pizzichini, N. Masetti (ITESRE, Bologna) report: We have determined the color indices of the optical afterglow of GRB011211 from the available data (GCN 1199, GCN 1200, GCN 1209), using the calibration by Henden et al. (GCN 1197). The interpolation method described in Simon et al. (2001, A&A, 377, 450) was used. The indices of the afterglow of GRB011211 are: t-To=0.503 days: V-R=0.39; R-I=0.42 t-To=1.183 days: B-V=0.52; V-R=0.44; R-I=0.53 t-To=1.463 days: V-R=0.28; R-I=0.60 The typical error of these indices is about 0.10 - 0.15 mag. The Galactic reddening E(B-V)=0.042, determined from the maps by Schlegel et al. (1998, ApJ, 500, 525), is comparable to the errors of the measurements and can be neglected here. These indices are close to the mean values of a sample of 17 afterglows (Simon et al. 2001) which yield (B-V)o=0.47+/-0.17, (V-R)o=0.40+/-0.13, (R-I)o=0.46+/-0.18. This suggests that the shape of the spectrum of the afterglow of GRB011211 is very similar to the other afterglows and that its intrinsic reddening (that is inside the host galaxy) must be again quite small (Simon et al. 2001). The search for the host galaxy and the determination of its type are therefore encouraged. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1213 SUBJECT: GRB 011211: Detection of the Probable Host Galaxy DATE: 01/12/24 20:55:58 GMT FROM: Andrew S. Fruchter at STScI GRB011211: Detection of the Probable Host Galaxy Ingunn Burud, James Rhoads, Andrew Fruchter (STScI) and Jens Hjorth (Copenhagen) report on behalf of GRACE (Gamma-Ray Afterglow Collaboration at Eso): We have obtained a deep R-band image (1 hour integration) of GRB011211 from the VLT+FORS2 on Dec. 21.79 in 0."65 seeing. We find that the source at the position of the afterglow is now an extended object. By deconvolving the image (using the technique of Magain, Courbin & Sohy, 1998, ApJ, 494, 452) we find the OT to be superposed on an apparent host galaxy. The OT is offset from the center of the host by 0."5 to the southeast. The total magnitude of the system is R = 24.2 +/- 0.2, with the magnitude of the host estimated at R = 25.0 +/- 0.3 and that of the OT R = 24.8 +/- 0.3. The image may be found at: http://www.stsci.edu/~burud/Web/GRB/grb011211.html //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1214 SUBJECT: Optical polarization observations for GRB011211 DATE: 02/01/01 20:47:03 GMT FROM: Stefano Covino at Brera Astronomical Observatory S. Covino, G. Ghisellini, P. Saracco, G. Tagliaferri, F. Zerbi (Observ. of Brera, Milan, Italy); S. Di Serego, A. Cimatti (Observ. of Arcetri, Florence, Italy); F. Fiore, G.L. Israel, L. Stella (Observ. of Monte Porzio, Rome, Italy); N. Kawai (RICHEN, Japan); D. Lazzati (IoA, Cambridge, UK); S. Ortolani (University of Padua, Italy); L. Pasquini (ESO, Garching, Munich, Germany); G. Ricker (MIT, USA); R. Gilmozzi, E. Pompei (ESO, Paranal, Chile) report: On 2001 December 13.29 we observed the optical counterpart to the X-ray rich GRB011211 that was reported by Grav et al. (GCN 1191). The observations were performed with the ESO VLT-3 (Melipal) telescope equipped with FORS1 with a Bessel R band filter in the imaging polarimetry mode. The transient source is clearly detected and the acquisition image allowed to derive the Bessel V magnitude of the transient, V=21.81 +/- 0.06, with respect to the USNO star U0675_11427359 (Henden, GCN 1197). Polarimetric measurements were performed by means of PSF fitting and aperture techniques for the optical transient and a number of field stars in order to estimate the average Galactic dust induced field polarization. The result is that the optical transient polarization is consistent with zero within the observational uncertainties. We estimate an upper limit to the linear polarization of the OT of about 2.5%. Further analyses are in progress. A plot in the Q and U Stokes' vector plane for the field objects is shown at the URL: http://www.merate.mi.astro.it/~covino/GRB011211/GRB_POL.jpg. The OT is in red. This message is citeable. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1215 SUBJECT: GRB011211: BeppoSAX/GRBM data DATE: 02/01/07 18:45:54 GMT FROM: Filippo Frontera at ITESRE CNR F.Frontera, Physics Dept. University of Ferrara, Ferrara and Istituto Astrofisica Spaziale and Fisica Cosmica (IASF), CNR, Bologna; L. Amati, IASF, CNR, Bologna; C. Guidorzi and E. Montanari, Physics Dept, University of Ferrara; E. Costa, M. Feroci, L. Piro, IASF, CNR, Rome; J. Heise, Space Research Organization Netherlands (SRON), Utrecht; and J.J.M. in 't Zand, Astronomical Institute and SRON, Utrecht, report: With reference to the GRB011211(=XRF011211) (GCN 1188, 1189), a detailed analysis of the BeppoSAX GRBM data shows a very shallow long event in the 40-700 keV band with two peaks and a total duration of about 270 s, similar to that measured in X-rays (2-28 keV) with the BeppoSAX WFC. The quick look analysis could not single out such long and faint signal. The 40--700 peak flux (with 8 s bins) is about 0.5 x10^-7~erg/cm^2 s, while its fluence is about 5x10^-6 erg/cm^2. The X/gamma fluence ratio is similar to that found in a number of ordinary GRBs detected by BeppoSAX. The distinguishing features of GRB011211 are its long duration (the longest event localized with BeppoSAX) and its faintness both in X- and gamma-rays. We conclude that this event cannot be classified as an X--ray flash. From the measured redshift (z = 2.14, Fruchter et al. GCN 1200), the gamma ray energy released, assuming isotropy, is 6.3x10^52 erg, assuming a Friedman-Robertson-Walker cosmology with H0=65 Km/s Mpc and Omega_m=0.3. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1303 SUBJECT: GRB011211 revised BVRI field photometry DATE: 02/03/23 18:57:09 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired additional BVRcIc all-sky photometry for an 11x11 arcmin field that is approximately centered on the position of the optical transient for GRB011211 reported by Grav et al. (GCN 1191) with the USNOFS 1.0-m telescope. The field was observed on two more nights, with the new dataset posted at: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb011211.dat Stars brighter than V=13.5 are saturated and should be used with care. The current photometry has a potential external zero-point error of about one percent. The astrometry in this file is based on linear plate solutions with respect to USNO-A2.0. The internal errors are less than 100mas. The two new nights have shown that the photometry reported in GCN 1197 has larger error than originally estimated, most likely caused by a combination of the very poor seeing, high airmass and approaching dawn. For example, the comparison star U0675_11427359 that was used by Grav et al.and Jensen et al. (GCN 1195) to calibrate their field can be found in the new .dat file with the following magnitudes: GCN 1195 (Jensen) B = 18.65 V = 18.18 R = 17.90 I = 17.07 GCN 1197 (Henden) B = 18.65 V = 18.11 R = 17.76 I = 17.42 new result B = 18.48 V = 18.00 R = 17.70 I = 17.37 We apologize for the lateness of this correction, but this winter has had unusually few photometric nights. This is the first case in several dozen calibrations that we have performed for the GRB community in which the final dataset differed from the initial dataset by more than a couple of percent. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1311 SUBJECT: GRB011211: HST Observations of Optical Afterglow and Host Galaxy DATE: 02/03/28 06:32:29 GMT FROM: Derek Fox at CIT D.W. Fox, J.S. Bloom, and S.R. Kulkarni (Caltech) report on behalf of a larger collaboration: "We have imaged the optical afterglow (GCN 1191) and presumed host galaxy of GRB011211 (GCN 1215) with the Hubble Space Telescope and STIS (Clear) instrument for 5133s on December 25.8 UT. The host galaxy is clearly detected and extends for roughly 0.5 arcsec northeast of the afterglow. Our observations confirm the result of Burud et al. (GCN 1213), with the caveat that the afterglow offset is approximately 0.3 arcsec and to the southwest rather than the southeast of the host galaxy. A GIF image of the near field may be found at: http://www.astro.caltech.edu/~derekfox/grb011211/