GRB231118A

This page lists all entries on GRB231118A in GRBweb

Summary Fermi GBM IPN Swift GCN 35100 GCN 35101 GCN 35103 GCN 35104 GCN 35106 GCN 35108 GCN 35109 GCN 35110 GCN 35113 GCN 35116 GCN 35123 GCN 35126 GCN 35127 GCN 35131 GCN 35135 GCN 35141 GCN 35143 GCN 35151 GCN 35167

Summary table
Variable Value Source
GRB_name_Fermi GRB231118720
T0 17:16:29 UTC GCN_circulars,Fermi GBM final loc
ra 4.8302° Swift
decl -48.0400° Swift
pos_error 5.44e-05° Swift
T90 5.76 s Fermi_GBM
T90_error 0.572 s Fermi_GBM
T90_start 17:16:29.320 UTC Fermi_GBM
fluence 7.40e-06 erg/cm² Fermi_GBM
fluence_error 5.01e-08 erg/cm² Fermi_GBM
redshift 0.8304
T100 41.63 s
GBM_located False
mjd 60266.71978009259 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB231118720
trigger_name bn231118720
ra 4.8429°
decl -48.0350°
pos_error 2.75e+00°
datum 2023-11-18
t_trigger 17:16:29.832 UTC
T90 5.76 s
T90_error 0.572 s
T90_start 17:16:29.320 UTC
fluence 7.40e-06 erg/cm²
fluence_error 5.01e-08 erg/cm²
flux_1024 1.80e+01 erg/cm²/s
flux_1024_error 5.35e-01 erg/cm²/s
flux_1024_time 3.20e+00 erg/cm²/s
flux_64 3.02e+01 erg/cm²/s
flux_64_error 2.27e+00 erg/cm²/s
IPN table
GRB_name GRB231118A
ra 4.8417°
decl -48.0333°
pos_error 5.00e-02°
redshift 0.8304
Swift table
GRB_name GRB231118A
t_trigger 17:16:33 UTC
ra 4.8302°
decl -48.0400°
pos_error 5.44e-05°
T90 37.63 s
fluence 3.70e-06 erg/cm²
redshift 0.8304
GCN 35100 table
GRB_name GRB231118A
GCN_number 35100
Detection_method Fermi GBM final loc
t_trigger 17:16:29 UTC
ra 4.0000°
decl -48.2000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35100 SUBJECT: GRB 231118A: Fermi GBM Final Real-time Localization DATE: 23/11/18 17:27:02 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 17:16:29 UT on 18 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231118A (trigger 722020594.832338 / 231118720). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 4.0, Dec = -48.2 (J2000 degrees, equivalent to J2000 00h 16m, -48d 12'), with a statistical uncertainty of 1.4 degrees. The angle from the Fermi LAT boresight is 118.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118720/quicklook/glg_skymap_all_bn231118720.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118720/quicklook/glg_healpix_all_bn231118720.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118720/quicklook/glg_lc_medres34_bn231118720.gif
GCN 35101 table
GRB_name GRB231118A
GCN_number 35101
Detection_method Swift Det
t_trigger 17:16:33 UTC
ra 4.8430°
decl -48.0350°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35101 SUBJECT: GRB 231118A: Swift detection of a burst DATE: 23/11/18 17:31:56 GMT FROM: David Palmer at LANL S. Laha (GSFC/UMBC), M. Ferro (INAF-OAB), C. Gronwall (PSU), M. J. Moss (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII), T. Sbarrato (INAF-OAB), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team: At 17:16:33 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 231118A (trigger=1197311). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 4.843, -48.035 which is RA(J2000) = 00h 19m 22s Dec(J2000) = -48d 02' 07" 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 15 sec. The peak count rate was ~11,000 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a telemetry outage, XRT and UVOT data are not immediately available and will be reported later. Burst Advocate for this burst is S. Laha (sib.laha AT gmail.com). 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/)
GCN 35103 table
GRB_name GRB231118A
GCN_number 35103
Detection_method Swift Other
ra 4.8307°
decl -48.0403°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35103 SUBJECT: GRB 231118A: Skynet Optical Afterglow Discovery DATE: 23/11/18 18:45:17 GMT FROM: Dylan Dutton at UNC Chapel Hill Dylan Dutton, Megan Dubay, Donovan Schlekat, Logan Selph, Daniel Reichart, Joshua Haislip, Vladimir Kouprianov, Daryl Janzen, Arie Verveer, John Kennewell, and Ruide Fu report on behalf of the Skynet Robotic Telescope Network at the University of North Carolina at Chapel Hill. We observed the field of GRB 231118A with our 0.4m robotic telecope located in Meckering, Australia. The observation began at 17:19:11 UTC on Nov 18 2023, approximately 3 minutes after the trigger. We obtained multiple expsoures in the B, V, R, and I filters. Exposure lengths were calculated using our automated exposure length scaling model. We detected a bright object within the uncertainty radius of the Swift localization, at: R.A. (J2000): 00:19:19.3583 Dec. (J2000): -48:02:24.923 We report the discovery photometry below. ExpLen | Filter | Mag | Date | UTC ----------------------------------------- 3.034s | R | 14.8 | Nov 18, 2023 | 17:19:30 Our images have been calibrated using stars from the APASS catalog.
GCN 35104 table
GRB_name GRB231118A
GCN_number 35104
Detection_method Swift-XRT Other
ra 4.8314°
decl -48.0390°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35104 SUBJECT: GRB 231118A: Swift-XRT position DATE: 23/11/18 18:45:21 GMT FROM: K.L. Page at U Leicester K.L. Page and P.A. Evens (U. Leicester) report on behalf of the Swift-XRT team: Using promptly downlinked data we find an uncatalogued X-ray source located at RA,Dec = 4.8314, -48.0390 which is equivalent to: RA (J2000) = 00 19 19.65 DEC (J2000) = -48 02 20.8 with an uncertainty of 3.50 arcsec (radius, 90% containment). This location is 31.4 arcsec from the BAT position, inside the BAT error circle. This circular is an official product of the Swift-XRT team.
GCN 35106 table
GRB_name GRB231118A
GCN_number 35106
Detection_method Swift-XRT Det
ra 4.8313°
decl -48.0394°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35106 SUBJECT: GRB 231118A: Enhanced Swift-XRT position DATE: 23/11/18 20:12:11 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 539 s of XRT Photon Counting mode data and 1 UVOT images for GRB 231118A, 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 = 4.83131, -48.03940 which is equivalent to: RA (J2000): 00h 19m 19.51s Dec (J2000): -48d 02' 21.8" with an uncertainty of 2.2 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 35108 table
GRB_name GRB231118A
GCN_number 35108
Detection_method Other
ra 4.8307°
decl -48.0403°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35108 SUBJECT: GRB 231118A: Continued Skynet Observations DATE: 23/11/18 21:49:27 GMT FROM: Dylan Dutton at UNC Chapel Hill Dylan Dutton, Megan Dubay, Ruide Fu, Donovan Schlekat, Logan Selph, Daniel Reichart, Joshua Haislip, Vladimir Kouprianov, Daryl Janzen, Arie Verveer, and John Kennewell report on behalf of the Skynet Robotic Telescope Network at the University of North Carolina at Chapel Hill. We continued to observe the afterglow of GRB 231118A located at RA=00:19:19.3583, Dec=-48:02:24.923 (GCN 35103, Dutton et al.) with our 0.4m robotic telecope located in Meckering, Australia. The observation began at 17:19:11 UTC on Nov 18 2023, approximately 3 minutes after the trigger, and continued for approximately 100 minutes, until 18:54:53 UTC. We obtained multiple expsoures in the B, V, R, and I filters. During the first approximately 40 minutes of the observation, the afterglow faded very slowly, and irregularly, with an approximate temporal index between -0.2 and -0.1. After 40 minutes, the afterglow faded much more quickly with an approximate temporal index between -2 and -1.5, which could be consistent with the non-detection from Global MASTER-Net (GCN 35107, Lipunov et al.). Throughout the entire observation, the afterglow is very red, with an approximate spectral index between -2 and -1.5. This is likely due to source-frame dust. We report the photometry of our most recent images below. ExpLen | Filter | Mag | MagErr | Date | UTC ----------------------------------------------------------- 110.95s | R | 17.02 | 0.04 | Nov 18, 2023 | 18:52:55 89.47s | I | 16.65 | 0.07 | Nov 18, 2023 | 18:54:53 Our images have been calibrated using stars from the APASS catalog.
GCN 35109 table
GRB_name GRB231118A
GCN_number 35109
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 35109 SUBJECT: GRB 231118A: MASTER OT observation DATE: 23/11/18 22:10:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Lipunov (Lomonosov MSU), D.Buckley (SAAO), A.Kuznetsov, D.Vlasenko, P.Balanutsa, K.Zhirkov, E.Gorbovskoy, Ya.Kechin, Yu.Tselik, N.Tiurina, I.Gorbunov, V.Vladimirov, D.Zimnukhov, V.Senik, V.Topolev, A.Yudin, A.Chasovnikov, D.Cheryasov, A.Sosnovskij, A.Pozdnyakov, M.Gulyaev (Lomonosov MSU,SAI,PhysicsDepartment), O.A. Gres, N.M. Budnev (Irkutsk State University, API), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) MASTER Global robotic net (MASTER-Net:http://observ.pereplet.ru Lipunov etal.,2010,Advances in Astronomy,2010,30L) started Fermi (GCN 35100) and Swift (Evans et al. GCN 35101, GCN 35104, GCN 35106) GRB 231118A error box observation at 2023-11-18 20:19:50 UT by MASTER-SAAO (Lipunov et al. GCN 35107). There is optical counterpart MASTER OT J001919.45-480224.7 with m_OT=19.2m+-0.2m at 2023-11-18 20:26:40 and next 5 expositions (automatic, unfiltered, mlim=19.5), at Skynet position (discovered by Dutton et al. GCN 35103, GCN 35108) Observations started at 70deg.altitude. Observation and reduction will be continued.
GCN 35110 table
GRB_name GRB231118A
GCN_number 35110
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 35110 SUBJECT: GRB 231118A: LCOGT Optical Observations DATE: 23/11/18 22:32:28 GMT FROM: Robert Strausbaugh at Eastern Illinois University R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration: We observed the Swift/Fermi GRB 231118A field (Fermi GBM Team, GCN 35100; Laha et al., GCN 35101) with the LCOGT 1-meter Sinistro instrument at the South African Astronomical Observatory site, on November 18, from 21:20 to 21:52 UT (corresponding to 4.07 to 4.60 hours from the GRB trigger time) with the Bessel R and I filters. We performed a series of 3x300s exposures in each band. We detect an uncataloged source consistent with the Skynet afterglow candidate (Dutton et al., GCN 35103) in both bands. This result is consistent with fading detected in continued Skynet observations (Dutton et al., GCN 35108) and MASTER observations (Lipunov, et al., GCN 35109) The following magnitudes are calculated using the USNO-B1.0 catalog as reference: R = 19.08 +/- 0.04 I = 18.67 +/- 0.03 These magnitudes are not corrected for galactic extinction.
GCN 35113 table
GRB_name GRB231118A
GCN_number 35113
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 35113 SUBJECT: GRB 231118A: Las Cumbres optical detection DATE: 23/11/19 00:04:57 GMT FROM: Manisha Shrestha at University of Arizona M. Shrestha (Univ. of Arizona), D. Sand (Univ. of Arizona), K. D. Alexander (Univ. of Arizona), J. Andrews (Gemini), J. Pearson (Univ. of Arizona), N. Smith (Univ. of Arizona), K. Bostroem (Univ. of Arizona) D. A. Howell (LCO/UCSB), C. McCully (LCO/UCSB), M. Newsome (LCO/UCSB), E Padilla Gonzalez (LCO/UCSB), C. Pellegrino (LCO/UCSB), G. Terreran (LCO/UCSB), J. Farah (LCO/UCSB) report on behalf of a wider Global Supernova Project collaboration: We observed the field of GRB 231118A (Fermi GBM team GCN 34937, Swift GCN 34938) with the 1-m telescope, on 2023-11-18T22:30:11.370 UT (60266.937 MJD, ~5.3 hours after the trigger) using the Sinistro instrument in g, r, i bands. We detect the GRB with the following magnitude: g = 19.81 +-0.09 r = 19.45 +-0.14 i = 19.44 +-0.19 Magnitudes were calculated with respect to ATLAS-REFCAT2 (Tonry et al. 2018, ApJ 867 105) catalog and are not corrected for galactic extinction. These values are consistent with other detections (Dutton et al., GCN 35103, Dutton et al., GCN 35108, Lipunov et al., GCN 35109, Strausbaugh et al., GCN 35110)
GCN 35116 table
GRB_name GRB231118A
GCN_number 35116
Detection_method AstroSat CZTI
Circular_text TITLE: GCN CIRCULAR NUMBER: 35116 SUBJECT: GRB 231118A: AstroSat CZTI detection DATE: 23/11/19 05:42:15 GMT FROM: Gaurav Waratkar at IIT Bombay P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 231118A which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 35100), and Swift-BAT (Laha et al., GCN Circ. 35101). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2023-11-18 17:16:33.55 UTC. The measured peak count rate associated with the burst is 773 (+165, -131) counts/s above the background in the combined data of three quadrants (out of four), with a total of 885 (+229, -215) counts. The local mean background count rate was 237 (+5, -8) counts/s. Using cumulative rates, we measure a T90 of 3.9 (+1.6, -1.0) s. The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-11-18 17:16:32.74 UTC. The measured peak count rate associated with the burst is 638 (+71, -77) counts/s above the background in the combined data of all quadrants, with a total of 1634 (+436, -460) counts. The local mean background count rate was 1222 (+9, -10) counts/s. We measure a T90 of 3.7 (+1.8, -1.3) s from the cumulative Veto light curve. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb
GCN 35123 table
GRB_name GRB231118A
GCN_number 35123
Detection_method Optical
redshift 0.8304
Circular_text TITLE: GCN CIRCULAR NUMBER: 35123 SUBJECT: GRB 231118A: VLT/X-shooter redshift DATE: 23/11/19 14:44:04 GMT FROM: Benjamin Schneider at MIT B. Schneider (MIT), A. Saccardi (GEPI, Observatoire de Paris), L. Izzo (INAF-Naples & DARK/NBI), A. J. Levan (Radboud), D. B. Malesani (DAWN/NBI), N. R. Tanvir (Univ. Leicester), G. Pugliese (Amsterdam), report on behalf of the Stargate collaboration: We observed the field of the Swift/Fermi GRB 231118A (Fermi GBM Team, GCN 35100; Laha et al., GCN 35101) using the ESO VLT UT3 (Melipal) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of 4 exposures of 600s each. The observation mid-time is 01:23:787 UT on Nov 19 2023 (8.1 hr after the Fermi trigger). In a 30s image taken with the acquisition camera on Nov 19 00:51:23 UT, we clearly detect the optical afterglow (Dutton et al., GCN 35103, GCN 35108; Lipunov et al., GCN 35109; Strausbaugh et al., GCN 35110; Shrestha et al, GCN 35113), for which we measure an AB magnitude r = 19.88 +/- 0.04 mag (calibrated against one nearby star from Legacy Survey). In a preliminary reduction, we clearly detect a continuum over the entire wavelength range. From detection of multiple absorption features, which we interpret as being due to FeII, MnII, MgII, MgI and FeII*, ZnII, CrII, and CaII, we infer a common redshift of z = 0.8304. We conclude this is the redshift of the burst. We also detect multiple emission lines (Halpha, Hbeta, OIII doublet) at a consistent redshift, which we interpret as being due to the GRB host galaxy. We also note the presence of additional absorption features likely due to multiple intervening systems. We acknowledge expert support from the ESO staff in Paranal, in particular Thomas Rivinius and Matias Jones.
GCN 35126 table
GRB_name GRB231118A
GCN_number 35126
Detection_method Swift Det
t_trigger 18:58:24 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 35126 SUBJECT: GRB 231118A: MeerLICHT afterglow detection DATE: 23/11/19 15:33:03 GMT FROM: Simon de Wet at University of Cape Town S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO) and P.M. Vreeswijk (Radboud) report on behalf of the MeerLICHT consortium: The 0.6 m wide-field MeerLICHT optical telescope located in Sutherland, South Africa, obtained a repeated series of 60 s exposures in the q,u,g,r,i,z bands of GRB 231118A following the Swift detection (Laha et al., GCN 35101). Observations started at 18:58:24 UT on 2023 November 18 (1.7 hours post-trigger) and continued until 21:46:37 UT, following the filter sequence quqgqrqiqz. We detect the optical afterglow first reported by Dutton et al. (GCN 35103) with the following AB magnitudes: q = 17.65 +/- 0.05 at 18:58:56 UT u = 18.39 +/- 0.20 at 19:00:35 UT g = 18.03 +/- 0.09 at 19:04:08 UT r = 17.40 +/- 0.12 at 19:07:43 UT i = 17.24 +/- 0.11 at 19:28:53 UT z = 17.72 +/- 0.17 at 19:50:19 UT Our high cadence q-band observations show a power-law decline with temporal index of -1.63, consistent with the decay reported by Dutton et al. (GCN 35108). MeerLICHT is built and run by a consortium consisting of Radboud University, the University of Cape Town, the South African Astronomical Observatory, the University of Oxford, the University of Manchester and the University of Amsterdam.
GCN 35127 table
GRB_name GRB231118A
GCN_number 35127
Detection_method Swift-XRT Other
redshift 0.8304
Circular_text TITLE: GCN CIRCULAR NUMBER: 35127 SUBJECT: GRB 231118A: Swift-XRT refined Analysis DATE: 23/11/19 19:16:02 GMT FROM: Phil Evans at U of Leicester A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), S. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 5.0 ks of XRT data for GRB 231118A, from 86 s to 81.5 ks after the BAT trigger. The data comprise 117 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The light curve can be modelled with an initial power-law decay with an index of alpha=0.84 (+/-0.05), followed by a break at T+8184 s to an alpha of 1.6 (+0.4, -0.3). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.36 (+0.14, -0.13). The best-fitting absorption column is 8.6 (+3.4, -2.8) x 10^21 cm^-2, at a redshift of 0.8304, in addition to the Galactic value of 1.9 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.51 (+0.13, -0.12) and a best-fitting absorption column of 8.9 (+2.5, -2.2) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.8 x 10^-11 (5.7 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Galactic foreground: 1.9 x 10^20 cm^-2 Intrinsic column: 8.9 (+2.5, -2.2) x 10^21 cm^-2 at z=0.8304 Photon index: 1.51 (+0.13, -0.12) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01197311. This circular is an official product of the Swift-XRT team.
GCN 35131 table
GRB_name GRB231118A
GCN_number 35131
Detection_method Fermi GBM Det
t_trigger 17:16:29.830 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 35131 SUBJECT: GRB 231118A: Fermi GBM observation DATE: 23/11/20 03:17:28 GMT FROM: Lorenzo Scotton at UAH C. de Barra (UCD) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 17:16:29.83 UT on 18 November 2023, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 231118A (trigger 722020594 / 231118720), which was also detected by Swift BAT (S. Laha et al. 2023, GCN 35101) and Swift XRT (K.L. Page & P.A. Evens, 2023, GCN 35104). The Fermi Final Localization was reported in GCN 35100 and is consistent with the Swift BAT and XRT positions. The angle from the Fermi LAT boresight at the GBM trigger time is 118 degrees. The GBM light curve consists of a single peak with a duration (T90) of about 6 s (50-300 keV). The time-averaged spectrum from -4.1s to 6.1 s is best fit with a Band function with Epeak = 217.7 +/- 22.6 keV, alpha = -0.77 +/- 0.07, and beta = -2.17 +/- 0.13 The event fluence (10-1000 keV) in this time interval is (1.0 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.2 s in the 10-1000 keV band is 18.0 +/- 0.5 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN 35135 table
GRB_name GRB231118A
GCN_number 35135
Detection_method Swift-UVOT Det
ra 4.8302°
decl -48.0400°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35135 SUBJECT: 231118A: Swift-UVOT Detection DATE: 23/11/20 12:42:03 GMT FROM: Paul Kuin at MSSL N.P.M. Kuin (MSSL/UCL) and S. L. Laha (GSFC/UMBC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 231118A 105 s after the BAT trigger (Laha et al., GCN Circ. 35101). A source consistent with the XRT position (Evans et al., GCN Circ. 35106) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 00:19:19.26 = 4.83024 (deg.) Dec (J2000) = -48:02:24.1 = -48.04004 (deg.) with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence). Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 105 255 147 17.28 +/- 0.03 v 1052 1071 20 16.59 +/- 0.16 b 573 593 19 17.10 +/- 0.11 u 318 568 246 16.69 +/- 0.04 w1 1618 1638 19 17.18 +/- 0.24 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.013 in the direction of the burst (Schlegel et al. 1998).
GCN 35141 table
GRB_name GRB231118A
GCN_number 35141
Detection_method Swift-BAT Det
ra 4.8400°
decl -48.0440°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35141 SUBJECT: GRB 231118A: Swift-BAT refined analysis DATE: 23/11/20 20:35:03 GMT FROM: Mike Moss at NASA GSFC M. J. Moss (GSFC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231118A (trigger #1197311) (Laha, et al., GCN Circ. 35101). The BAT ground-calculated position is RA, Dec = 4.840, -48.044 deg which is RA(J2000) = 00h 19m 21.7s Dec(J2000) = -48d 02' 37.5" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 55%. The light curve shows a single pulse with similar rise and fall times. There is also a dim tail extending 30 seconds after the main pulse. T90 (15-350 keV) is 37.63 +- 8.89 sec (estimated error including systematics). The time-averaged spectrum from T-6.84 to T+55.21 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.40 +- 0.07. The fluence in the 15-150 keV band is 3.7 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T-0.08 sec in the 15-150 keV band is 9.7 +- 0.5 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/1197311/BA/
GCN 35143 table
GRB_name GRB231118A
GCN_number 35143
Detection_method Fermi GBM Det
t_trigger 17:16:29.937 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 35143 SUBJECT: GRB 231118A: VZLUSAT-2 detection DATE: 23/11/20 20:47:21 GMT FROM: Marianna Dafčíková at Masaryk University <500025@mail.muni.cz> M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration. The long-duration GRB 231118A (Fermi/GBM detection: GCN 35100; Swift/BAT detection: GCN 35101; AstroSat detection: GCN 35116; Konus/WIND trigger at 2023-11-18 17:16:29.937 UT, INTEGRAL/SPI-ACS peak detection at 2023-11-18 ~17:16:33 UT) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/). The data acquisition was performed by the GRB detector unit no. 1. The detection was confirmed at the peak time 2023-11-18 17:16:34 UTC. The T90 duration is 8 s and the significance during T90 reaches 5.6 sigma. The light curve obtained by VZLUSAT-2 is available here: https://vzlusat2.konkoly.hu/static/share/GRB231118A_GCN_VZLUSAT2.pdf All VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/ The GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.
GCN 35151 table
GRB_name GRB231118A
GCN_number 35151
Detection_method Fermi GBM Det
t_trigger 17:16:29.937 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 35151 SUBJECT: GRB 231118A: GRBAlpha detection DATE: 23/11/21 14:46:20 GMT FROM: Marianna Dafčíková at Masaryk University <500025@mail.muni.cz> M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), yyT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration. The long-duration GRB 231118A (Fermi/GBM detection: GCN 35100; Swift/BAT detection: GCN 35101; AstroSat detection: GCN 35116; VZLUSAT-2 detection: GCN 35143; Konus/WIND trigger at 2023-11-18 17:16:29.937 UT, INTEGRAL/SPI-ACS peak detection at 2023-11-18 ~17:16:33 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048). The detection was confirmed at the peak time 2023-11-18 17:16:33 UTC. The T90 duration measured by GRBAlpha is 4 s and the overall significance during T90 reaches 8.5 sigma in the 120-400 keV band. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB231118A_GCN.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume.
GCN 35167 table
GRB_name GRB231118A
GCN_number 35167
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 35167 SUBJECT: GRB 231118A: REM optical afterglow detection DATE: 23/11/23 13:57:31 GMT FROM: Paolo D'Avanzo at INAF-OAB R. Brivio, M. Ferro, P. D'Avanzo, D. Fugazza, S. Covino (INAF-OAB) on behalf of the REM team, report: We observed the field of GRB 231118A (Fermi GBM Team., GCN 35100; Laha et al., GCN 35101) with the REM 60cm robotic telescope located at the ESO Observatory of La Silla (Chile). The observations were carried out in the g, r, i, z, J, H and K bands, starting on 2023 Nov 19 at 00:16:39 UT (i.e. about 7.00 hours after the GBM and Swift trigger) and lasted for about 1 hour. The optical afterglow (Dutton et al., GCN 35103, Strausbaugh et al., GCN 35110, Shrestha et al., GCN 35113, de Wet et al., GCN 35126, Takahashi et al., GCN 35133), is detected in r, i bands coadded frames (t_exp = 20 min) . From preliminary photometry, we derive the following magnitudes and limits: r = 19.66 +/- 0.08 (AB) i = 19.19 +/- 0.11 (AB; calibrated against the the APASS catalogue) at a mid time of t-t0 ~ 7.68 hours after the GRB trigger. H > 17.7 (Vega; calibrated against the 2MASS catalogue) at a mid time of t-t0 ~ 7.44 hours after the GRB trigger.