//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4455 SUBJECT: GRB 060109: Swift Detection of a long burst DATE: 06/01/09 17:31:48 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift M. De Pasquale (MSSL), S. Barthelmy (GSFC), A. Beardmore (U. Leicester), J. Cummings (GSFC/ORAU), N. Gehrels (GSFC), M.R. Goad (U. Leicester), O. Godet (U. Leicester), J. Kennea (PSU), H. Krimm (GSFC/USRA), F. Marshall (GSFC), K. Page (U. Leicester), D. Palmer (LANL), T. Sakamoto (GSFC), on behalf of the Swift Team: At 16:54:41 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060109 (trigger=176620). The BAT on-board calculated location is RA,Dec 282.710, +31.989 {18h 50m 50s, +31d 59' 22"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 10 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~8 sec after the trigger. The XRT began observing the burst at 16:56:22 UT, 101 sec after the BAT trigger. A bright (0.2-10 keV flux of 4.8e-09 erg/cm2/sec), fading, uncatalogued source was found by the on-board centroiding algorithm at RA(J2000)= 18h 50m 43.9s DEC(J2000)= +31d 59' 34.7" with an uncertainty of 5.8 arcsec radius (90% containment). This uncertainty includes a systematic error of about 5 arcsec in the on-board calculated positions due to the XRT boresight offset. This position lies 84 arcsec from the centre of the BAT error circle. UVOT took a finding chart exposure of 200 seconds with the V filter starting 104 sec after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 18th mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 19.0 mag. No correction has been made for the expected visual extinction of about 0.5 magnitudes. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4460 SUBJECT: GRB060109, optical observation DATE: 06/01/10 00:49:00 GMT FROM: Shouta Maeno at U.of Miyazaki S.Maeno,E.Sonoda,S.Masuda,Y.Nakamura,M.Yamauchi (University of Miyazaki) "We have observed the field covering the error circle of GRB 060109 (GCN 4455) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 20:10:19 UT on Jan.09. After co-adding a set of 6 images (20:10:19 - 20:18:06 UT) of 30 sec exposures, we have compared with the USNO A2.0 catalog. Preliminary analysis shows there is no new source brighter than 17.4mag." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4461 SUBJECT: GRB 060109: Swift/UVOT upper limits DATE: 06/01/10 05:54:08 GMT FROM: Alexander Blustin at MSSL-UCL A. J. Blustin (UCL-MSSL), M. De Pasquale (UCL-MSSL), S. R. Rosen (UCL-MSSL), L. Cominsky (Sonoma State U.), J. Norris (GSFC), N. Gehrels (GSFC) on behalf of the Swift/UVOT team The Swift/UVOT began observing the field of GRB 060109 at 16:56:13 UT on 2006-01-09 whilst settling on the target, 92 s after the BAT trigger (De Pasquale et al., GCN 4455). No new source is detected at the XRT position (reported by De Pasquale et al.) in coadded images with any of the filters down to the following 3-sigma magnitude upper limits. These values are not corrected for Galactic extinction; E(B-V) = 0.144. Filter T_range(s) Exp(s) 3sigUL(mag) V 92-22100 1449 20.0 B 312-18155 1132 20.8 U 637-17925 1038 20.5 W1 613-17696 1001 19.9 M2 589-22330 1233 20.3 W2 542-21871 1262 19.9 White 517-18385 1018 20.9 //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4462 SUBJECT: GRB 060109: Refined Swift-XRT analysis DATE: 06/01/10 08:15:16 GMT FROM: Kim Page at U.of Leicester A.P. Beardmore, K.L. Page (U.Leicester), J. Kennea (PSU), M. De Pasquale (UCL-MSSL), P. Meszaros, M. Chester (PSU) report on behalf of the Swift XRT team: We have analysed the first four orbits of Swift-XRT data from GRB 060109. 8.3ks of PC mode data give a refined position of RA(J2000) = 18h 50m 43.5s Dec(J2000) = +31d 59' 29.7" with an estimated uncertainty of 3.2 arcsec (90% containment). This position is 7.7 arcsec away from the on-board XRT position quoted in De Pasquale et al. (GCN 4455) and includes the latest XRT boresight correction. The X-ray lightcurve shows a steeply declining early phase, with a decay slope of 5.1, which breaks to a shallower slope of 0.14 at about 300s. This is followed by a second break at 6100s to a slope of 1.2. The X-ray spectrum 100s to 200s after the BAT trigger can be fitted with an absorbed power-law with a photon index of 1.85+/-0.09 and a column density consistent with the Galactic value in this direction of 1.0e21 cm**2. The observed (unabsorbed) 0.3-10.0 keV flux over this interval is 5.1E-10 (6.2E-10) ergs cm**-2 s**-1. If the source continues to fade at the current rate we predict an XRT count rate of 0.006 counts/s 24hrs after the trigger, which corresponds to an observed (0.3-10 keV) flux of 2.4e-11 ergs cm**-2 s**-1. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4466 SUBJECT: Correction to GRB 060109 XRT analysis DATE: 06/01/10 09:25:19 GMT FROM: Kim Page at U.of Leicester K.L. Page, A.P. Beardmore (U. Leicester), D. Fox (PSU) and M. De Pasquale (UCL-MSSL) report on behalf of the Swift-XRT team: The predicted observed flux at 24 hours for GRB 060109 is 2.4e-13 erg cm^-2 s^-1. The value in GCN 4462 was incorrectly given as being 2 orders of magnitude higher. We apologise for any confusion. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4476 SUBJECT: GRB 060109: Swift-BAT refined analysis DATE: 06/01/11 00:21:10 GMT FROM: Takanori Sakamoto at NASA/GSFC D. Palmer (LANL), M. Ajello (MPE), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), R. Fink (GSFC), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (ISAS), J. Tueller (GSFC), on behalf of the Swift-BAT team: Using the data set from T-299.2 to T+302.9 sec from the recent telemetry downlink, we report further analysis of BAT GRB 060109 (trigger #176620) (De Pasquale, et al., GCN 4455). The BAT ground-calculated position is (RA,Dec) = 282.739, 32.009 {18h 50m 57.3s, 32d 0' 32.6"} (deg; J2000) +- 3.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 92%. The mask-tagged lightcurve shows a double peak structure. The first peak has a duration of ~20 sec. starting from T-2 sec. And the second peak has a duration of ~40 sec. starting from T+75 sec. T90 (15-350 keV) is (116 +- 3) sec (estimated error including systematics). Over the full burst interval (T-0.4 to T+126.8 sec), the power law index of the time-averaged spectrum is 1.96 +- 0.25. The fluence in the 15-150 keV band is (6.4 +- 1.0) x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+90.19 sec in the 15-150 keV band is (0.5 +- 0.1) ph/cm2/sec. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5279 SUBJECT: GRB 060109: Upper Limit on Host Galaxy DATE: 06/06/27 18:54:50 GMT FROM: Alexander Kann at TLS Tautenburg D. A. Kann (Thueringer Landessternwarte Tautenburg) and S. Manohar (USC, Los Angeles), report: We observed the field of GRB 060109 (Pasquale et al., GCN 4455) with the Tautenburg 1.34m Schmidt telescope under good observing conditions. We obtained 11 x 600 sec images in the Rc filter for a total integration time of 110 minutes. The mean observation time was June 27.9920 UT, which is 168.2 days after the burst. We determine the zero point of the image in comparison with nine unsaturated and isolated stars of the USNOB1.0 catalog. Astrometry is also performed against the USNOB1.0 catalog. At the refined position of the X-ray afterglow (Beardmore et al., GCN 4462), we do not detect any sources. The 2 sigma limiting magnitude of the image is Rc=23.5. This magnitude is not corrected for the moderate foreground extinction, E(B-V)=0.144. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5280 SUBJECT: Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109) DATE: 06/06/27 19:02:50 GMT FROM: Alexander Kann at TLS Tautenburg D. A. Kann (TLS Tautenburg) reports: The mean observation times of the locations of GRB 060105 (Kann & Manohar, GCN 5278) and GRB 060109 (Kann & Manohar, GCN 5279) should read 26.9X UT, not 27.9X UT. We regret this mistake and thank Petr Kubanek, who also pointed it out.