//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26177 SUBJECT: GRB 191106A: Swift detection of a burst DATE: 19/11/06 14:27:48 GMT FROM: Scott Barthelmy at NASA/GSFC F. E. Marshall (NASA/GSFC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), M. G. Bernardini (INAF-OAB), D. N. Burrows (PSU), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC), P. A. Evans (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), S. J. LaPorte (PSU), A. Melandri (INAF-OAB), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team: At 14:15:23 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 191106A (trigger=933515). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 269.350, +46.052, which is RA(J2000)c = 17h 57m 24s Dec(J2000) = +46d 03' 06" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a few peaks with a total duration of about 5 sec. The peak count rate was ~2800 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 14:16:34.2 UT, 70.3 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 269.3349, 46.0346 which is equivalent to: RA(J2000) = 17h 57m 20.38s Dec(J2000) = +46d 02' 04.7" with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 73 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (4.38 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 4 (+4.05/-3.32) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 250 seconds with the U filter starting 130 seconds after the BAT trigger. No credible 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 19.2 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 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.06. Burst Advocate for this burst is F. E. Marshall (marshall AT milkyway.gsfc.nasa.gov). 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/) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26178 SUBJECT: GRB 191106A: MASTER optical observation DATE: 19/11/06 15:10:12 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tiurina,P.Balanutsa,A.Kuznetsov,V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, A.Pozdnyakov, E.Minkina, V.Senik (Lomonosov Moscow State University, SAI,Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile(Observatorio Astronomico Felix Aguilar OAFA), H. Levato(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley(South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova(Irkutsk State University, API), A. Tlatov, D. Dormidontov(Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State University), MASTER Global Robotic Net (http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) started Swift GRB 191106A (Marshall et al. GCN 26177) alert observation 19 sec after at 2019-11-06 14:16:03 UT. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the GRB191106.59 19 sec after notice time (39 sec after trigger time) at 2019-11-06 14:16:03 UT at sunset (sun altitude is -8.5 deg.). There is no OT with 5-sigma upper limit 14.0 mag at 2019-11-06 14:38:00UT. Error-box galactic latitude b = 28 deg., longitude l = 73 deg. The observations made on zenith distance = 27 deg.The moon (70 % bright part) is 26 deg. above the horizon. The distance between moon and object is 87 deg. The error-box can be observed till sunrise at 2019-11-07 03:49:40 MASTER-Amur was pointed to GRB 191106A 20 sec after notice time (41s after trigger time) at 2019-11-06 14:16:05 UT, but there are clouds. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26179 SUBJECT: GRB 191106A: BOOTES-4/MET optical limit DATE: 19/11/06 15:57:20 GMT FROM: Alberto J. Castro-Tirado at IAA-CSIC Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga), S. Guziy (Univ. of Nikolaev) and D. Xiong, Y. Fan, X. Zhao, J. Bai, C. Wang, Y. Xin (Yunnan National Astronomical Observatory) on behalf of a larger collaboration, report: Following the detection of GRB 191106A by Swift (Marshall et al. GCNC 26177), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) gathered images starting at 14:21 UT (~5.7 min after trigger). No optical afterglow is found down to 20.7 mag (unfiltered images) within the Swift/XRT error box, consistent with the non-detections by Swift/UVOT (Marshall et al. GCNC 26177) and MASTER (Lipunov et al. GCNC 26178). Observations are ongoing. We thank the staff at Lijiang Astronomical Observatory for their excellent support. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26180 SUBJECT: GRB 191106A: Mondy optical upper limit DATE: 19/11/06 16:15:08 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), E. Klunko (ISTP), A. Pozanenko (IKI), E. Mazaeva (IKI), A. Volnova report on behalf of IKI-GRB-FuN: We observed the field of GRB 191106A (Marshall et al. GCN 26177) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Nov. 06 (UT) 14:24:30, i.e. ~11 minutes after GRB trigger. We do not detect any optical object in the XRT error circle (Marshall et al. GCN 26177). Preliminary photometry of the field is following. Date UT start t-T0 Filter Exp. OT UL(3sigma) (mid, days) (s) 2019-11-06 14:24:30 0.03688 R 22*120 n/d 22.0 Photometry is based on the USNO-B2.0 nearby stars. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26190 SUBJECT: GRB 191106A: Swift-XRT refined Analysis DATE: 19/11/06 21:28:30 GMT FROM: Phil Evans at U of Leicester K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), M. Perri (ASDC), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Tohuvavohu (U. Toronto), J.A. Kennea (PSU), B. Sbarufatti (PSU) and F.E. Marshall report on behalf of the Swift-XRT team: We have analysed 6.3 ks of XRT data for GRB 191106A (Marshall et al. GCN Circ. 26177), from 106 s to 13.2 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The best available XRT position (using the promptly downlinked event data, the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) is RA, Dec = 269.3356, 46.0353 which is equivalent to: RA (J2000): 17 57 20.55 Dec(J2000): +46 02 06.9 with an uncertainty of 2.3 arcsec (radius, 90% confidence). The light curve can be modelled with a power-law decay with a decay index of alpha=3.37 (+0.33, -0.30). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.1 (+/-0.6). The best-fitting absorption column is 3.1 (+3.1, -2.1) x 10^21 cm^-2, in excess of the Galactic value of 4.4 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (5.6 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 3.1 (+3.1, -2.1) x 10^21 cm^-2 Galactic foreground: 4.4 x 10^20 cm^-2 Excess significance: 2.1 sigma Photon index: 2.1 (+/-0.6) If the light curve continues to decay with a power-law decay index of 3.37, the count rate at T+24 hours will be 7.4 x 10^-10 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.7 x 10^-20 (4.1 x 10^-20) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00933515. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26191 SUBJECT: GRB 191106A: NOT optical upper limit DATE: 19/11/07 01:08:39 GMT FROM: Dong Xu at NAOC/CAS Z.P. Zhu, D. Xu (NAOC), J. Viuho (NOT) report on behalf of a larger collaboration: We observed the field of GRB 191106A (Marshall et al., GCN 26177) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 19:35:51 UT on 2019-11-06 (i.e., 3.35 hr after the BAT trigger), and 16x200s Sloan z-band frames were obtained. No optical source is detected in our stacked image at the XRT position (Page et al., GCN 26190), down to a limiting magnitude of z > 22.0 at a mean time of 4.0 hr post-burst, calibrated with the nearby SDSS field. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26198 SUBJECT: GRB 191106A: Swift-BAT refined analysis DATE: 19/11/07 13:20:21 GMT FROM: Amy Lien at GSFC S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 191106A (trigger #933515) (Marshall et al., GCN Circ. 26177). The BAT ground-calculated position is RA, Dec = 269.356, 46.046 deg which is RA(J2000) = 17h 57m 25.4s Dec(J2000) = +46d 02' 44.7" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 95%. The mask-weighted light curve shows many overlapping pulses. The burst emission starts at ~T-1.3 s and ends at ~T+2.4 s. T90 (15-350 keV) is 3.42 +- 0.35 sec (estimated error including systematics). The time-averaged spectrum from T-1.31 to T+2.38 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.89 +- 0.17. The fluence in the 15-150 keV band is 3.2 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.02 sec in the 15-150 keV band is 1.1 +- 0.2 ph/cm2/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/933515/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26199 SUBJECT: GRB 191106A: Swift/UVOT Upper Limits DATE: 19/11/07 14:14:44 GMT FROM: Samantha Oates at MSSL S. R. Oates (U.Warwick) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 191106A 132 s after the BAT trigger (Marshall et al., GCN Circ. 26177). No optical afterglow consistent with the XRT position (Page et al., GCN Circ. 26190) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 4987 5137 147 >20.0 u_FC 132 381 246 >20.1 white 4987 6775 541 >21.0 v 437 7186 549 >19.9 b 387 12533 1264 >21.3 u 132 11621 1631 >20.8 w1 486 7510 464 >20.0 m2 461 7391 510 >20.0 w2 412 13245 1223 >20.6 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.06 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26201 SUBJECT: GRB 191106A: AstroSat CZTI detection DATE: 19/11/08 12:52:56 GMT FROM: Vidushi Sharma at IUCAA R. Gaikwad, S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data showed a weak detection of a GRB 191106A, which was also detected by Swift (Marshall F. E. et al., GCN # 26177), MASTER (Lipunov V. et al., GCN # 26178), BOOTES-4/MET (Hu Y.-D. et al., GCN # 26179), Mondy (Belkin S. et al., GCN # 26180), Swift-XRT (Page K. L. et al., GCN # 26190), NOT (Zhu Z. P. et al., GCN # 26191), Swift/BAT (Barthelmy S. D. et al., GCN # 26198) and Swift/UVOT (Oates S. R. et al., GCN # 26199). The source was detected in the 40-200 keV energy range. The light curve showed single pulse of emission peaking at 2019-11-06 14:15:23.0 UT. The measured peak count rate associated with the burst is 134 cts/s above the background in the combined data of four quadrants, with a total of 408 cts. The local mean background count rate was 502 cts/s. Using cumulative rates, we measure a T90 of 3.6 s. It was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.