//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26135 SUBJECT: GRB 191101A: Swift detection of a burst DATE: 19/11/01 21:33:39 GMT FROM: David Palmer at LANL A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC), J. A. Kennea (PSU), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 21:08:03 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 191101A (trigger=932742). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 251.844, +43.754 which is RA(J2000) = 16h 47m 23s Dec(J2000) = +43d 45' 15" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 20 sec. The peak count rate was ~1200 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 21:09:42.4 UT, 99.0 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 251.83474, 43.74103 which is equivalent to: RA(J2000) = 16h 47m 20.34s Dec(J2000) = +43d 44' 27.7" with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 52 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. We cannot determine whether the source is fading at the present time. No spectrum from the promptly downlinked event data is yet available to determine the column density. The initial flux in the 2.5 s image was 8.42e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 109 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 none of the XRT error circle. 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 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01. Burst Advocate for this burst is A. D'Ai (antonino.dai AT inaf.it). 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: 26137 SUBJECT: GRB 191101A: Prompt enhanced Swift-XRT position DATE: 19/11/01 21:48:45 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using promptly downlinked XRT event data for GRB 191101A, we find an enhanced XRT position of the afterglow: RA, Dec: 251.8374, 43.7406 which is equivalent to: RA (J2000) = 16 47 20.97 Dec (J2000) = +43 44 26.3 with an uncertainty of 2.1 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/932742. Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26139 SUBJECT: Swift GRB191101.88: Global MASTER-Net observations report DATE: 19/11/01 21:54:15 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov (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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the Swift GRB191101.88 (trigger No 932742,16h 47m 22.608s , +43d 45m 15.12s, R=0.05) errorbox 50 sec after trigger time at 2019-11-01 21:08:53 UT, with upper limit up to 16.2 mag. Observations started at twilight. The observations began at zenith distance = 75 deg. The sun altitude is -11.9 deg. The galactic latitude b = -60 deg., longitude l = 98 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1184828 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 55 | MASTER-Amur | P/ | 10 | 15.6 | 74 | MASTER-Amur | P/ | 10 | 15.6 | 97 | MASTER-Amur | P/ | 20 | 15.7 | 125 | MASTER-Amur | P/ | 20 | 15.6 | 158 | MASTER-Amur | P/ | 30 | 15.9 | 201 | MASTER-Amur | P/ | 40 | 16.1 | 255 | MASTER-Amur | P/ | 50 | 16.2 | 318 | MASTER-Amur | P/ | 60 | 15.8 | 398 | MASTER-Amur | P/ | 60 | 15.8 | 477 | MASTER-Amur | P/ | 60 | 15.7 | 556 | MASTER-Amur | P/ | 60 | 15.6 | 636 | MASTER-Amur | P/ | 60 | 15.5 | 716 | MASTER-Amur | P/ | 60 | 15.6 | 795 | MASTER-Amur | P/ | 60 | 15.4 | 944 | MASTER-Amur | P/ | 60 | 15.3 | 1023 | MASTER-Amur | P/ | 60 | 15.1 | 1103 | MASTER-Amur | P/ | 60 | 15.0 | 1182 | MASTER-Amur | P/ | 60 | 14.9 | 1262 | MASTER-Amur | P/ | 60 | 14.6 | The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26140 SUBJECT: GRB 191101A: Enhanced Swift-XRT position DATE: 19/11/01 23:49:51 GMT FROM: Phil Evans at U of Leicester A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 1298 s of XRT Photon Counting mode data and 1 UVOT images for GRB 191101A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 251.83723, +43.74096 which is equivalent to: RA (J2000): 16h 47m 20.94s Dec (J2000): +43d 44' 27.5" with an uncertainty of 1.8 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26142 SUBJECT: GRB 191101A: VIRT Optical Upper Limits DATE: 19/11/02 01:51:43 GMT FROM: Priyadarshini Gokuldass at U. of the Virgin Islands P. Gokuldass (UVI), D. Morris (UVI), N. Orange (OrangeWave Innovative Science, LLC), A. Cucchiara (College of Marin), R. Strausbaugh (UVI) report: We observed the field of GRB 191101A (A.P. Beardmore et al., GCN 26140; P.A. Evans et al., GCN 26137, D'Ai et al., GCN 26135) with the 0.5m Virgin Island Robotic Telescope (VIRT) on 11-01-2019 starting at 23:03:18 UT (T+115m). We report on an initial series of exposures in Clear filter totaling 110s with an observation midpoint of T+117m. The weather conditions were very good during the hours of observation and the zenith angle at the start of the observation was 63 degrees. We observed the Swift XRT position with a 20'x20' field of view. We find no new source at the Swift-XRT position and report a 3-sigma upper limit of approximately V=17.0. The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase. Observations and analysis are ongoing. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26144 SUBJECT: GRB 191101A: Swift-XRT refined Analysis DATE: 19/11/02 06:34:50 GMT FROM: Phil Evans at U of Leicester J. D. Gropp (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (ASDC), V. D'Elia (ASDC), A. Tohuvavohu (U. Toronto), J.A. Kennea (PSU) and A. D'Ai report on behalf of the Swift-XRT team: We have analysed 7.9 ks of XRT data for GRB 191101A (D'Ai et al. GCN Circ. 26135), from 92 s to 24.5 ks after the BAT trigger. The data comprise 190 s in Windowed Timing (WT) mode (the first 5 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 26137). The late-time light curve (from T0+4.8 ks) is consistent with a constant source of mean count rate 4.8e+00 ct/sec. A power-law fit gives an index of 0.18 (+0.22, -0.21). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.28 (+/-0.05). The best-fitting absorption column is 9.9 (+1.2, -1.1) x 10^20 cm^-2, in excess of the Galactic value of 1.3 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.08 (+0.15, -0.14) and a best-fitting absorption column of 6.2 (+3.2, -2.9) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (3.7 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.2 (+3.2, -2.9) x 10^20 cm^-2 Galactic foreground: 1.3 x 10^20 cm^-2 Excess significance: 2.8 sigma Photon index: 2.08 (+0.15, -0.14) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00932742. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26145 SUBJECT: GRB 191101A: iTelescope optical limit DATE: 19/11/02 10:01:01 GMT FROM: Albert Kong at NTHU A.K.H. Kong (NTHU, Taiwan) reports We observed the field of GRB 191101A (D'Ai et al. GCN 26135) with the T11 0.5m telescope of iTelescope.Net in New Mexico. The observation was done with a luminance filter (400-700 nm) beginning at 2019-11-02 02:08:44 UT (5 hours after the trigger) for 300 sec. At the position of the enhanced X-ray afterglow (Evans et al. GCN 26137), we do not detect any optical emission with a detection limit of about 19.5 mag by comparing with the Gaia DR2 catalogue. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26164 SUBJECT: GRB 191101A: Swift/UVOT Upper Limits DATE: 19/11/04 19:01:00 GMT FROM: Sam LaPorte at PSU GRB 191101A: Swift/UVOT Upper Limits S. J. LaPorte (PSU) and A. D'Ai (INAF-IASFPA) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 191101A 110 s after the BAT trigger (D'Ai et al., GCN Circ. 26135). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 26140) 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 110 259 147 >21.1 u_FC 268 517 246 >20.3 white 110 5863 589 >21.6 v 597 1588 110 >19.6 b 523 5658 294 >21.2 u 268 5453 540 >20.9 w1 646 5248 294 >19.3 m2 622 5043 300 >19.8 w2 573 1564 117 >19.3 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26167 SUBJECT: GRB 191101A: Swift-BAT refined analysis DATE: 19/11/04 21:44:54 GMT FROM: Hans Krimm at NSF/NASA-GSFC M. Stamatikos (OSU), S. D. Barthelmy (GSFC), A. D'Ai (INAF-IASFPA), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), T. N. Ukwatta (LANL) (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 BAT GRB 191101A (trigger #932742) (D'Ai, et al., GCN Circ. 26135). The BAT ground-calculated position is RA, Dec = 251.845, 43.740 deg which is RA(J2000) = 16h 47m 22.8s Dec(J2000) = +43d 44' 24.5" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 47%. The mask-weighted light curve shows a single, rather weak pulse, extending from ~T-20 sec, peaking at T+0 sec, dropping sharply at T+25 sec, followed by low-level extended emission out to ~T+140 sec. T90 (15-350 keV) is 137.95 +- 22.83 sec (estimated error including systematics). The time-averaged spectrum from T-20.97 to T+143.53 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.18. The fluence in the 15-150 keV band is 1.9 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-1.00 sec in the 15-150 keV band is 1.3 +- 0.3 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/932742/BA/