GRB171123A

This page lists all entries on GRB171123A in GRBweb

Summary IPN Swift GCN 22148 GCN 22150 GCN 22151 GCN 22152 GCN 22153 GCN 22154 GCN 22157 GCN 22158 GCN 22160 GCN 22161 GCN 22162 GCN 22166 GCN 22169

Summary table
Variable Value Source
T0 14:14:47 UTC GCN_circulars,Swift Det
ra 186.2465° Swift
decl 32.5010° Swift
pos_error 1.94e-04° Swift
T90 58.5 s Swift
T90_start 14:14:47 UTC Swift
fluence 4.80e-07 erg/cm² Swift
T100 58.5 s
GBM_located False
mjd 58080.59359953704 GCN_circulars,Swift Det
IPN table
GRB_name GRB171123A
ra 186.1917°
decl 32.5333°
pos_error 5.00e-02°
Swift table
GRB_name GRB171123A
t_trigger 14:14:47 UTC
ra 186.2465°
decl 32.5010°
pos_error 1.94e-04°
T90 58.5 s
fluence 4.80e-07 erg/cm²
GCN 22148 table
GRB_name GRB171123A
GCN_number 22148
Detection_method Swift Det
t_trigger 14:14:47 UTC
ra 186.1900°
decl 32.5310°
Circular_text TITLE: GCN CIRCULAR NUMBER: 22148 SUBJECT: GRB 171123A: Swift detection of a burst DATE: 17/11/23 14:54:37 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U Leicester), D. N. Burrows (PSU), A. Deich (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), M. H. Siegel (PSU) and A. Tohuvavohu (PSU) report on behalf of the Swift Team: At 14:14:47 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 171123A (trigger=791922). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 186.190, +32.531 which is RA(J2000) = 12h 24m 46s Dec(J2000) = +32d 31' 51" 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 40 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 14:16:17.8 UT, 90.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued possible X-ray source with an enhanced position: RA, Dec 186.2425, 32.5032 which is equivalent to: RA(J2000) = 12h 24m 58.19s Dec(J2000) = +32d 30' 11.4" with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 188 arcseconds from the BAT onboard position, just outside the BAT error circle. This possible source is weak and at the edge of the region of the XRT which is promptly downlinked; we are not completely certain that this is an astrophysical object. We are awaiting the full dataset to confirm the nature of this source. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.90 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 9.4 (+9.50/-2.54) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 93 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 0.02. Burst Advocate for this burst is P. A. Evans (pae9 AT star.le.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.)
GCN 22150 table
GRB_name GRB171123A
GCN_number 22150
Detection_method Swift-XRT Det
ra 186.2464°
decl 32.5010°
Circular_text TITLE: GCN CIRCULAR NUMBER: 22150 SUBJECT: GRB 171123A: Enhanced Swift-XRT position DATE: 17/11/23 15:57:18 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 1128 s of XRT Photon Counting mode data and 1 UVOT images for GRB 171123A, 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 = 186.24641, +32.50104 which is equivalent to: RA (J2000): 12h 24m 59.14s Dec (J2000): +32d 30' 03.7" with an uncertainty of 1.9 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.
GCN 22151 table
GRB_name GRB171123A
GCN_number 22151
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 22151 SUBJECT: GRB 171123A: Confirmation of the X-ray afterglow DATE: 17/11/23 16:41:02 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: We have now received the full dataset from the early Swift-XRT observations of GRB 171123A (Evans et al. GCN Circ. 22148). In these data, the afterglow is clearly detected, and the light curve shows an initial decay and plateau, typical of GRB afterglows. The best position currently available was given by Goad et al. (GCN Circ. 22150). This position is ~15 arcsec from that reported in GCN 22148. This is because the object lay ~14 arcsec outside the field of view of the promptly-available XRT data, so only the edges of the PSF were available for source localisation. As ever, the automated XRT analysis can be viewed at http://www.swift.ac.uk/xrt_products/00791922. This circular is an official product of the Swift-XRT team.
GCN 22152 table
GRB_name GRB171123A
GCN_number 22152
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 22152 SUBJECT: GRB 171123A: Swift-XRT refined Analysis DATE: 17/11/23 22:04:20 GMT FROM: Phil Evans at U of Leicester A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), V. D'Elia (ASDC) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 6.5 ks of XRT data for GRB 171123A (Evans et al. GCN Circ. 22148), from 98 s to 19.7 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 22150). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=3.4 (+0.7, -0.6). At T+306 s the decay flattens to an alpha of -0.33 (+0.25, -0.45) before breaking again at T+1892 s to a final decay with index alpha=0.68 (+0.13, -0.14). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.21 (+0.22, -0.21). The best-fitting absorption column is 8.8 (+5.1, -4.4) x 10^20 cm^-2, in excess of the Galactic value of 1.9 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 2.9 x 10^-11 (3.8 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 8.8 (+5.1, -4.4) x 10^20 cm^-2 Galactic foreground: 1.9 x 10^20 cm^-2 Excess significance: 2.6 sigma Photon index: 2.21 (+0.22, -0.21) If the light curve continues to decay with a power-law decay index of 0.68, the count rate at T+24 hours will be 0.010 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.0 x 10^-13 (3.8 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00791922. This circular is an official product of the Swift-XRT team.
GCN 22153 table
GRB_name GRB171123A
GCN_number 22153
Detection_method Swift-BAT Det
ra 186.1980°
decl 32.5030°
Circular_text TITLE: GCN CIRCULAR NUMBER: 22153 SUBJECT: GRB 171123A: Swift-BAT refined analysis DATE: 17/11/24 00:14:52 GMT FROM: Amy Lien at GSFC T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. A. Evans (U Leicester), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 171123A (trigger #791922) (Evans et al., GCN Circ. 22148). The BAT ground-calculated position is RA, Dec = 186.198, 32.503 deg which is RA(J2000) = 12h 24m 47.6s Dec(J2000) = +32d 30' 12.5" with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 86%. The mask-weighted light curve shows a weak pulse that starts at ~T-1 s and ends at ~T+20 s, with a tail lasting till ~T+60 s. In addition, there is a weak precursor from ~T-25 s to ~T-20 s. T90 (15-350 keV) is 58.5 +- 27.1 sec (estimated error including systematics). The time-averaged spectrum from T-1.39 to T+60.29 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.35 +- 0.34. The fluence in the 15-150 keV band is 4.8 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.27 sec in the 15-150 keV band is 0.8 +- 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/791922/BA/
GCN 22154 table
GRB_name GRB171123A
GCN_number 22154
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 22154 SUBJECT: GRB 171123A: MITSuME Akeno optical upper limits DATE: 17/11/24 07:02:25 GMT FROM: Katsuhiro L. Murata at Nagoya U K. Morita, R. Itoh, K. L. Murata, T. Yoshii, Y. Tachibana, S. Harita, T. Ozawa, H. Mamiya, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We searched for the optical counterpart of GRB 171123A (P. A. Evans et al., GCN Circular #22148) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 2017-11-23 16:24:30.61 UT. We did not find any new point source within enhanced XRT circle (M.R. Goad et al., GCN Circular #22150) in all three bands. We obtained following limits for the magnitudes. T0+[hour] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------------------------------------------------------- ~3.15 18:56:14.59 9360 >21.1 >20.7 >19.6 ------------------------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used GSC2.3 catalog for flux calibration.
GCN 22157 table
GRB_name GRB171123A
GCN_number 22157
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 22157 SUBJECT: GRB 171123A: GMG observation limit DATE: 17/11/24 12:55:39 GMT FROM: Jirong Mao at Yunnan Obs J. Mao, C.-J. Wang and J.-M. Bai (YNAO) report: We observed the field of GRB 171123A (Evans et al., GCN 22148) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. Observations began from 21:02:44 UT, about 6.8 hours after the trigger. We did not detect any source within the X-ray afterglow position error circle (Goad et al. GCN 22150), down to a limit of R~21.6 mag.
GCN 22158 table
GRB_name GRB171123A
GCN_number 22158
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 22158 SUBJECT: GRB 171123A: Swift/UVOT Upper Limits DATE: 17/11/24 13:06:31 GMT FROM: Sam Emery at MSSL-UCL S.W.K. Emery (UCL-MSSL) and P. A. Evans (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 171123A 94 s after the BAT trigger (Evans et al., GCN Circ. 22148). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 22150) 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 94 243 147 >20.9 u_FC 308 557 246 >20.5 white 94 2397 489 >21.0 v 637 2447 214 >18.8 b 563 2373 194 >19.7 uvw1 13669 18855 1209 >20.7 uvm2 12763 13663 886 >20.6 uvw2 23870 35081 1032 >21.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN 22160 table
GRB_name GRB171123A
GCN_number 22160
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 22160 SUBJECT: GRB 171123A: RATIR Optical and NIR Observations DATE: 17/11/24 15:06:18 GMT FROM: Nat Butler at Az State U Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report: We observed the field of GRB 171123A (Evans, et al., GCN 22148) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2017/11 24.47 to 2017/11 24.54 UTC (21.06 to 22.77 hours after the BAT trigger), obtaining a total of 1.07 hours exposure in the r and i bands and 0.45 hours exposure in the Z, Y, J, and H bands. For a source within the Swift-XRT error circle (Goad, et al., GCN 22150), in comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following upper limits (3-sigma): r > 23.60 i > 23.39 Z > 22.23 Y > 21.69 J > 21.43 H > 21.02 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 22161 table
GRB_name GRB171123A
GCN_number 22161
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 22161 SUBJECT: GRB 171123A: Nanshan-1m optical upper limit DATE: 17/11/24 15:38:53 GMT FROM: Dong Xu at NAOC/CAS Z.P. Zhu, H.X. Feng, D. Xu (NAOC), Z. Fan, W. Wang, J. Zheng, N. Song (NAOC), S.G. Ma, J. Liu (XAO), Y.D. Hu (IAA-CSIC) report We observed the field of GRB 171123A (Evans et al., GCN 22148) using the 1-m telescope located at Nanshan, Xinjiang, China. We obtained 3x120s, 1x180s SDSS i-band and 1x120s r-band frames, starting at 21:12:40 UT on 2017-11-23, i.e., 6.8 hr after the BAT trigger. No optical source was detected in the stacked image at the XRT position (Goad et al., GCN 22150), down to a limiting magnitude of i~20.6 mag, at the median time of 6.92 hr post-burst, calibrated with the SDSS field.
GCN 22162 table
GRB_name GRB171123A
GCN_number 22162
Detection_method Other
ra 186.2470°
decl 32.5009°
Circular_text TITLE: GCN CIRCULAR NUMBER: 22162 SUBJECT: GRB 171123A: Tautenburg observations DATE: 17/11/24 16:01:55 GMT FROM: Sylvio Klose at TLS Tautenburg S. Schmidl, B. Stecklum, S. Klose, A. Nicuesa Guelbenzu, and C. Hoegner (Thueringer Landessternwarte Tautenburg) report: We observed the field of GRB 171123A (Evans et al., GCN 22148) in the Rc band using the Tautenburg Schmidt telescope equipped with the prime focus CCD camera. Observations started at 04:01 UT, about 14 hr after the burst. At the SE border of the enhanced XRT error circle (radius 1.9 arcsec; Goad et al., GCN 22150; 1.5 arcsec acc. to the newest results presented at http://www.swift.ac.uk/xrt_positions/00791922/) we find a faint source at coordinates RA (J2000) : 12:24:59.29, Dec (J2000): 32:30:03.4 (+/- 0.6 arcsec). At a midtime of 04:46 UT we measure a preliminary magnitude of Rc (Vega) = 22.7 +/- 0.3, calibrated against SDSS field stars. The non-detection of this source by RATIR eight hours after our observing run (Butler et al., GCN 22160) suggests that this was the GRB afterglow. We caution however that this is only a 3-sigma detection.
GCN 22166 table
GRB_name GRB171123A
GCN_number 22166
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 22166 SUBJECT: GRB 171123A: OSN Upper Limit DATE: 17/11/24 18:52:37 GMT FROM: Luca Izzo at IAA-CSIC L. Izzo, D. A. Kann, A. de Ugarte Postigo (all HETH/IAA-CSIC), and V. Casanova (IAA-CSIC) report: We observed the field of GRB 171123A (Evans et al.; GCN Circ. 22148) with the 1.5-m OSN telescope in Granada, Spain. We began observing at 03:32:53 UT (13.3 hours after the GRB trigger), and obtained 18x300s images in the Ic band. Observations were obtained in inclement conditions (clouds, bad seeing of ~2") and the last four images could not be used. In our stacked image, we find no source at the position reported by Schmidl et al. (GCN Circ. 22162) down to a a 3-sigma limit of Ic (Vega) > 21. The calibration was performed using nearby stars in the USNO B1 catalog.
GCN 22169 table
GRB_name GRB171123A
GCN_number 22169
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 22169 SUBJECT: GRB 171123A: TShAO optical upper limit DATE: 17/11/24 23:05:11 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (IKI), A. Kusakin (Fesenkov Astrophysical Institute), I. Reva (Fesenkov Astrophysical Institute), E. Mazaeva (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 171123A (Evans et al., GCN 22148) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on Nov., 23 (UT) 23:31:56. We took several images in R-filter. Within enhanced XRT error circle (Goad et al., GCN 22150) we do not detect any object. Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) (3 sigma) 2017-11-23 23:31:56 0.41294 R 38*120 n/d n/d 22.2 Photometry is based on nearby USNO-B1.0 stars, R2 magnitude.