//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11357 SUBJECT: GRB 101020A: Swift detection of a burst DATE: 10/10/20 23:54:11 GMT FROM: David Palmer at LANL C. J. Saxton (UCL-MSSL), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (NASA/UMBC), M. De Pasquale (UCL-MSSL), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), O. M. Littlejohns (U Leicester), C. B. Markwardt (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift Team: At 23:40:41 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 101020A (trigger=436737). Due to a Sun constraint, Swift was unable to slew to the burst. The BAT on-board calculated location is RA, Dec 189.566, +23.161 which is RA(J2000) = 12h 38m 16s Dec(J2000) = +23d 09' 39" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with image triggers, the BAT light curve does not show any clear structure. Ground processing of the flight scaled map shows a strong 14 sigma source. The peak count rate was ~200 counts/sec (15-350 keV), at ~0 sec after the trigger. There are no known X-ray transient sources near this position. Due to an Sun observing constraint, Swift cannot slew to the BAT position until 17:41 UT on 2010 November 02. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is C. J. Saxton (cjs2 AT mssl.ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11358 SUBJECT: GRB 101020A, Swift-BAT refined analysis DATE: 10/10/21 13:36:55 GMT FROM: Hans Krimm at NASA-GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), G. Sato (ISAS), C. J. Saxton (UCL-MSSL), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of Swift/BAT GRB 101020A (trigger #436737) (Saxton, et al., GCN Circ. 11357). The BAT ground-calculated position is RA, Dec = 189.607, 23.129 deg which is RA(J2000) = 12h 38m 25.8s Dec(J2000) = +23d 07' 44.1" with an uncertainty of 3.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 42%. The mask-weighted light curve shows a very broad peak with no obvious features, extending roughly from T-50 sec to T+150 sec. Most of the emission is below 50 keV. A pre-planned slew took the burst out of the field of view at about T+230 sec. T90 (15-350 keV) is 175.0 +- 28. sec (estimated error including systematics). The time-averaged spectrum from T-50.0 to T+159.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.04 +- 0.17. The fluence in the 15-150 keV band is 2.6 +- 0.3 x 10^-06 erg/cm^2. The 1-sec peak photon flux measured from T+19.00 sec in the 15-150 keV band is 0.5 +- 0.2 ph/cm^2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/436737/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11359 SUBJECT: GRB 101020A: MASTER polarization optical observations DATE: 10/10/21 14:16:08 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk MASTER-Net robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located near Ekaterinburg (Kourovka) was pointed to the Swift GRB 101008A (Saxton et al., GCN#11357) 22 s after Notice Time and 106 s after trigger time at large zenit distance (80 degrees). We have number images in two perpendicular polarizations (along apha & dec) in V-band. We have no found any OT. t_start-t_trig(s) mean time exp_time(s) m_lim Coadd? Filter -------------------------------------------------------------------------- 106 116 20 14.0 N V+P1 106 116 20 14.0 N V+P2 106 116 20+20 14.5 Y V+P1+P2 -------------------------------------------------------------------------- MASTER II have 2 images per exposition time. The message may be cited. mailto: lipunov@sai.msu.ru //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11360 SUBJECT: GRB 101020A: BOOTES2 follow-up and limit DATE: 10/10/21 14:23:38 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Martin Jelinek (IAA-CSIC) and Antonio de Ugarte Postigo (DARK/NBI) on behalf of a larger collaboration report: "The 0.6m Telma telescope at BOOTES-2 (Malaga, Spain) observed the errorbox of GRB101020a (Saxton et al., GCNC11357) in the early morning of 21. October 2010, starting 04:48 UT. 40x 60s r' band images were taken. The combined exposure has a 3-sigma magnitude limit r'>18.0 calibrated against USNO-A2.0. The effective exposure time is 05:08:14UT, i.e. 5.46h after the GRB trigger." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 11361 SUBJECT: GRB 101020A: MASTER prompt and afterglow limit DATE: 10/10/22 15:41:40 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk MASTER-Net robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located near Ekaterinburg (Kourovka) was pointed to the Swift GRB 101008A (Saxton et al., GCN#11357) 22 s after Notice Time and 106 s after trigger time at large zenit distance (80 degrees) (Krushinski et al., GCN Circ 11359). We have no found any OT. t_start-t_trig(s) mean time exp_time(s) m_lim Coadd? Filter -------------------------------------------------------------------------- 106 116 20+20 14.9 Y V 472 2836 4300 18.5 Y V -------------------------------------------------------------------------- MASTER II have 2 images per exposition time. The message may be cited. mailto: lipunov@sai.msu.ru