//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3556 SUBJECT: Swift trigger 143708 is really GRB 050701 DATE: 05/07/01 12:38:19 GMT FROM: Hans Krimm at NASA-GSFC P. Boyd (GSFC/UMBC), L. Barbier (NASA GSFC), D. Burrows (PSU), N. Gehrels (NASA GSFC), M. Goad (Leicester), C. Hurkett (Leicester), M. Ivanushkina (PSU), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. Page (Leicester U), D. Palmer (LANL), A. Parsons (NASA GSFC), T. Poole (MSSL), P. Roming (PSU) At 11:42:59 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB050701(trigger=143708). The BAT on-board calculated location is RA,Dec 227.287d -59.419d {+15h 09m 09s, -59d 25' 06"} (J2000) with an uncertainty of 3 arcmin (radius, 3-sigma, including estimated systematic uncertainty). The detection significance in the image plane is 14.2 sigma. The BAT light curve showed a complex multipeaked structure with a duration of about 40 seconds. The peak count rate of 5000 counts/sec (15-350 keV) was measured by BAT in the 1-sec time interval centered on T+15 sec after the trigger. Because this burst was 40 arcminutes from a known source (PSR 1509-58) it was incorrectly classified on-board and so Swift did not automatically slew to observe this burst. A target of opportunity observation is being planned. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3557 SUBJECT: GRB 050701: Swift XRT afterglow position DATE: 05/07/01 16:56:50 GMT FROM: David Burrows at PSU/Swift J. L. Racusin, D. N. Burrows, D. C. Morris, D. Grupe, J. Nousek (PSU), C. Hurkett, J. P. Osborne, K. L. Page, M. R. Goad, A. A. Wells (U. Leicester), W. Voges (MPE), and N. Gehrels (GSFC) report on behalf of the Swift XRT team: The Swift BAT instrument detected GRB 050701 at 11:42:59 UT on 01 July 2005 (Boyd et al. 2005, GCN 3556). The BAT instrument incorrectly classified this as a known source in the on-board catalog and the observatory did not make an automated slew. A ToO observation was uploaded at about 13:00 UT. The spacecraft slewed to the target and XRT began taking data in Manual State/PC mode at about 13:19:05 (5766 s post-burst). Based on XRT quick-look data products at the MOC, we find a faint uncataloged X-ray source located at: RA(J2000) = 15:09:01.9, Dec(J2000) = -59:24:56.3. We estimate an uncertainty of about 6 arcseconds radius (90% containment). This source is located 55 arcseconds from the BAT position in GCN 3556. Further XRT results will be released as the standard pipeline data products are analyzed. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3558 SUBJECT: GRB050701: Swift-BAT Refined analysis DATE: 05/07/01 17:42:40 GMT FROM: Hans Krimm at NASA-GSFC H. Krimm (GSFC/USRA), S. Barthelmy, L. Barbier (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hinshaw (GSFC/SPSYS), D. Hullinger (GSFC/UMD), C. Markwardt (GSFC/UMD), P. Meszaros (PSU), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), M. Suzuki (Saitama), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the full data set from the recent telemetry downlink, further analysis of Swift-BAT GRB050701 (GCN Circ 3556) over the time interval of T-4.7 to T+8.9 sec with a power law fit yields an index of 1.62 +-0.07 and a fluence of 1.9x10^-6 erg/cm2 in the 15-350 keV band and a peak flux of 3.5 +- 0.2 ph/cm2/sec (also 15-350 keV) in a 1-sec wide window starting at T+7.3 sec. The lightcurve has two main peaks with some pre-trigger emmission starting at T-7 sec, and small peak at T+27 sec. This burst occurred within the 40-arcmin search radius of the PSR 1509-58 source in the on-board catalog. Hence the on-board trigger-type identification yielded a match. This radius has been reduced to a more reasonable value of 20 arcmin for this post-verification era. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3559 SUBJECT: Swift UVOT observations of GRB 050701 DATE: 05/07/01 22:07:19 GMT FROM: Massimiliano de Pasquale at MSSL-UCL M. De Pasquale (MSSL), P. Boyd (GSFC), A. Blustin (MSSL), J. Nousek (PSU), W. Voges (MPE), on behalf of the Swift UVOT team The Swift UVOT began observing the field of GRB 050701 (Boyd et al, GCN 3356) 1.6 hours after the trigger. No new source is detected within the 6 arcsec radius XRT error circle (Racusin et al., GCN 3557). We report the following 3 sigma magnitude upper limits. Filter T_middle(s) Exposure(s) Upper limit V 13730 670 19.61 B 11940 900 20.78 U 7860 637 20.17 UVW1 7110 900 20.5 UVM2 6210 900 20.5 UVW2 12890 900 20.71 The magnitudes are based on preliminary zero-points, measured in orbit, and will require refinement with further calibration. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3560 SUBJECT: GRB 050701: Refined XRT analysis DATE: 05/07/01 22:38:03 GMT FROM: David Burrows at PSU/Swift C. Hurkett, J. P. Osborne, K. L. Page, M. R. Goad, A. A. Wells (U. Leicester), J. L. Racusin, D. N. Burrows, D. C. Morris, D. Grupe, M. Chester (PSU), F. Marshall and N. Gehrels (GSFC) report on behalf of the Swift XRT team: We have analyzed the Swift XRT data from the first four orbits of GRB 050701 ToO (Racusin et al., GCN3557; Krimm et al., GCN 3558). The X-ray source is clearly fading during this time period, indicating that it is the GRB afterglow. The refined coordinates for the X-ray afterglow are: RA(J2000) = 15h 09m 01.8s, Dec(J2000) = -59:24:50.1 The estimated uncertainty is 6 arcseconds radius (90% containment). A preliminary spectral fit to all of the PC data gives a spectral power law photon index of 1.8 +/- 0.5 in the [0.2-10] keV band, assuming Galactic absorption (5.6E20cm^-2). The average estimated flux for this model in the 2.0-10.0 keV range is approximately 1.9E-12 ergs cm-2 s-1 at 6770s after the trigger time. A preliminary estimate of the X-ray decay power-law index is alpha = -0.66. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3562 SUBJECT: GRB 050701, optical observations DATE: 05/07/02 21:20:02 GMT FROM: Alberto Castro-Tirado at LAEFF-INTA T. Britton (Univ. of Auckland), J. Gorosabel (IAA-CSIC Granada), P. Tristram, Ph. Yock (Univ. of Auckland), M. Sasaki, C. Okada, S. Nakamura and K. Kamiya (Nagoya Univ.), O. Bogdanov (Nikolaev State Univ.), S. Guziy and A. J. Castro-Tirado (IAA-CSIC), report: Following the detection of GRB 050701 by Swift/BAT (Boyd et al, GCN 3356), we obtained R- & I-band images starting 5.0 hours after the trigger, at the 0.6 m and 1.8 m telescopes at Mt. John Astronomical Observatory. No new source is detected within the 6" radius XRT error circle (Hurkett et al., GCN 3560) down to the DSS-2 limiting magnitude. We also notice that there is considerable extinction towards this line of sight. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3563 SUBJECT: GRB 050701 DATE: 05/07/05 00:01:42 GMT FROM: Michael Schwartz at Tenegra Obs. Paul Luckas (Tenagra W. Australia) , Odd Trondal (Tenagra Norway) and Michael Schwartz (Tenagra Arizona) report: Following the detection of GRB 050701 by Swift/BAT (Boyd et al, GCN 3356), we obtained unfiltered images starting 14.7 hours after the trigger, using one of Tenagra observatory's 0.35-m telescopes at Perth, Western Australia. No new source was detected within the 6" radius XRT error circle (Hurkett et al., GCN 3560) down to the DSS-2 limiting magnitude. This message may be cited. -Michael Schwartz, on behalf of the Tenagra Observatories GRB followup team.