GRB231028A

This page lists all entries on GRB231028A in GRBweb

Summary Fermi GBM IPN Swift GCN 34893 GCN 34894 GCN 34897 GCN 34899 GCN 34900 GCN 34901 GCN 34909 GCN 34914

Summary table
Variable Value Source
GRB_name_Fermi GRB231028173
T0 4:09:06 UTC GCN_circulars,Fermi GBM final loc
ra 214.0160° Swift
decl 20.8970° Swift
pos_error 7.77e-03° Swift
T90 34.817 s Fermi_GBM
T90_error 0.572 s Fermi_GBM
T90_start 4:09:08.705 UTC Fermi_GBM
fluence 1.74e-05 erg/cm² Fermi_GBM
fluence_error 2.44e-08 erg/cm² Fermi_GBM
T100 40.23 s
GBM_located False
mjd 60245.17298611111 GCN_circulars,Fermi GBM final loc
Fermi GBM table
GRB_name_Fermi GRB231028173
trigger_name bn231028173
ra 214.0292°
decl 20.8950°
pos_error 2.55e+00°
datum 2023-10-28
t_trigger 4:09:06.657 UTC
T90 34.817 s
T90_error 0.572 s
T90_start 4:09:08.705 UTC
fluence 1.74e-05 erg/cm²
fluence_error 2.44e-08 erg/cm²
flux_1024 1.48e+01 erg/cm²/s
flux_1024_error 3.82e-01 erg/cm²/s
flux_1024_time 3.97e+00 erg/cm²/s
flux_64 1.83e+01 erg/cm²/s
flux_64_error 1.59e+00 erg/cm²/s
IPN table
GRB_name GRB231028A
ra 214.0292°
decl 20.9000°
pos_error 5.00e-02°
Swift table
GRB_name GRB231028A
t_trigger 4:09:09 UTC
ra 214.0160°
decl 20.8970°
pos_error 7.77e-03°
T90 37.23 s
fluence 7.20e-06 erg/cm²
GCN 34893 table
GRB_name GRB231028A
GCN_number 34893
Detection_method Fermi GBM final loc
t_trigger 4:09:06 UTC
ra 214.3000°
decl 21.8000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34893 SUBJECT: GRB 231028A: Fermi GBM Final Real-time Localization DATE: 23/10/28 04:19:34 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 04:09:06 UT on 28 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231028A (trigger 720158951.657448 / 231028173). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 214.3, Dec = 21.8 (J2000 degrees, equivalent to J2000 14h 17m, 21d 48'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 23.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231028173/quicklook/glg_skymap_all_bn231028173.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/bn231028173/quicklook/glg_healpix_all_bn231028173.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231028173/quicklook/glg_lc_medres34_bn231028173.gif
GCN 34894 table
GRB_name GRB231028A
GCN_number 34894
Detection_method Swift Det
t_trigger 4:09:09 UTC
ra 214.0290°
decl 20.8950°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34894 SUBJECT: GRB 231028A: Swift detection of a burst DATE: 23/10/28 04:28:17 GMT FROM: David Palmer at LANL M. A. Williams (PSU), S. Dichiara (PSU), D. M. Palmer (LANL), T. Sakamoto (AGU) and B. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team: At 04:09:09 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 231028A (trigger=1193078). Swift did not slew to the GRB location due to an observing constraint. The BAT on-board calculated location is RA, Dec 214.029, +20.895 which is RA(J2000) = 14h 16m 07s Dec(J2000) = +20d 53' 42" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex peak structure with a duration of at least 18 sec, although the immediately available data is truncated at T+8s due to packet loss. The peak count rate was ~8500 counts/sec (15-350 keV), at ~1 sec after the trigger. Due to a Sun observing constraint, Swift cannot slew to the BAT position until 15:45 UT on 2023 November 22. There will thus be no XRT or UVOT data for this trigger before this time. Swift Triggers have recently been re-enabled while we are dealing with attitude problems that can lead to star tracker Loss-of-Lock (LoL). We are confident that this GRB was not caused by an LoL event because: 1) The Swift_BAT_Position notice did not indicate a LoL. (See the comments section.) 2) This burst location was not near to a known bright source. 3) There was a simultaneous trigger by Fermi-GBM. 4) This is a rate-triggered burst on a 1.024 s timescale, while most LoL false triggers have been 'Image Triggers' with duration 64 s and longer. Observers should continue to be cautious (especially checking the comments for LoL) in future GCN notices going forward. Burst Advocate for this burst is M. A. Williams (mjw6837 AT psu.edu). 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 34897 table
GRB_name GRB231028A
GCN_number 34897
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 34897 SUBJECT: Swift GRB 231028A: Global MASTER-Net observations report DATE: 23/10/28 22:40:30 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 231028A ( M. A. Williams et al., GCN 34894) errorbox 39827 sec after notice time and 39846 sec after trigger time at 2023-10-28 15:13:16 UT, with upper limit up to 14.5 mag. Observations started at twilight. The observations began at zenith distance = 78 deg. The sun altitude is -12.3 deg. MASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 231028A errorbox 65649 sec after notice time and 65669 sec after trigger time at 2023-10-28 22:23:38 UT, with upper limit up to 16.0 mag. Observations started at twilight. The observations began at zenith distance = 79 deg. The sun altitude is -14.4 deg. The galactic latitude b = 69 deg., longitude l = 20 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2291906 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 39937 | MASTER-Kislovodsk | C | 180 | 13.6 | 40139 | MASTER-Kislovodsk | C | 180 | 13.0 | 40340 | MASTER-Kislovodsk | C | 180 | 14.5 | 41732 | MASTER-Kislovodsk | C | 180 | 13.0 | 65699 | MASTER-Tunka | C | 60 | 16.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 34899 table
GRB_name GRB231028A
GCN_number 34899
Detection_method Fermi GBM Det
t_trigger 4:09:06.660 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 34899 SUBJECT: GRB 231028A: Fermi GBM Detection DATE: 23/10/28 22:45:43 GMT FROM: Peter Veres at University of Alabama in Huntsville P. Veres (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 04:09:06.66 UT on 28 October 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231028A (trigger 720158951/231028173), which was also detected by the Swift/BAT (Williams et al. 2023, GCN 34894). The Fermi GBM Final Real-time Localization (GCN 34893) is consistent with the Swift position. The GBM light curve consists of multiple peaks with a duration (T90) of about 34.8 s (50-300 keV). The time-averaged spectrum from T0-4.1 to T0+43.0 s is best fit by a Band function with Epeak = 157 +/- 11 keV, alpha = -0.72 +/- 0.06, and beta = -2.13 +/- 0.08. The event fluence (10-1000 keV) in this time interval is (1.95 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+4.0 s in the 10-1000 keV band is 14.8 +/- 0.4 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 34900 table
GRB_name GRB231028A
GCN_number 34900
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 34900 SUBJECT: GRB 231028A: Glowbug gamma-ray detection DATE: 23/10/29 03:45:23 GMT FROM: J. Eric Grove at U.S. Naval Research Laboratory M. Kerr, C.C. Cheung, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report: The Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 231028A, which was also detected by Fermi/GBM (GCN 34893, 34899) and Swift/BAT (GCN 34894). Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2023-10-28 04:09:01.344 with a duration of 47.1 s and a total significance of about 91.2 sigma. The light curve comprises a structured main peak with at least two following peaks. Using a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=1.9 and a cutoff energy ("Epeak") of 198 keV. The modeled 10-10000 keV fluence is 9.8e-06 erg/cm^2. The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS. Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program’s STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV. [1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959 [2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O [3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006 Distribution Statement A: Approved for public release. Distribution is unlimited.
GCN 34901 table
GRB_name GRB231028A
GCN_number 34901
Detection_method AstroSat CZTI
Circular_text TITLE: GCN CIRCULAR NUMBER: 34901 SUBJECT: GRB 231028A: AstroSat CZTI detection DATE: 23/10/29 03:47:02 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 GRB 231028A which was also detected by Fermi-GBM (Fermi GBM Team, GCN Circ. 34893, Veres et al., GCN Circ. 34899), Swift-BAT (Williams et al., GCN Circ. 34894), and Glowbug (Kerr et al., GCN Circ. 34900). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2023-10-28 04:09:14.25 UTC. The measured peak count rate associated with the burst is 66 (+42, -4) counts/s above the background in the combined data of two quadrants (out of four), with a total of 273 (+88, -85) counts. The local mean background count rate was 156 (+1, -4) counts/s. Using cumulative rates, we measure a T90 of 7.8 (+0.9, -3.0) s. We caution that there was a 0.3 s readout dead time in CZTI after the detection of the burst. Hence, the T90 can be as large as 8.7 s for this GRB, with a lower limit of 4.8 s as estimated above by cumulative rates. The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-10-28 04:09:13.77 UTC. The measured peak count rate associated with the burst is 605 (+74, -72) counts/s above the background in the combined data of all quadrants, with a total of 2924 (+529, -560) counts. The local mean background count rate was 1508 (+6, -7) counts/s. We measure a T90 of 6.2 (+2.3, -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 34909 table
GRB_name GRB231028A
GCN_number 34909
Detection_method CALET
Circular_text TITLE: GCN CIRCULAR NUMBER: 34909 SUBJECT: GRB 231028A: CALET Gamma-Ray Burst Monitor detection DATE: 23/10/30 04:07:26 GMT FROM: Yuta Kawakubo at Louisiana State University A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The long GRB 231028A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 34893; Swift detection: Williams et al., GCN Circ. 34894; Fermi GBM Detection: Veres et al., GCN Circ. 34899; Glowbug gamma-ray detection: Kerr et al., GCN Circ. 34900; AstroSat CZTI detection: Navaneeth et al., GCN Circ. 34901) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 04:09:04.43 UTC on 28 October 2023 (http://cgbm.calet.jp/cgbm_trigger/flight/1382501309/index.html). The burst signal was seen by all CGBM detectors. The burst light curve shows a multi-peaked structure that starts at T+0.25 sec, peaks at T+6.5 sec, and ends at T+47.5 sec. The T90 and T50 durations measured by the SGM data are 36.1 +/- 1.2 sec and 6.9 +/- 1.1 sec (40-1000 keV), respectively. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1382501309/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.
GCN 34914 table
GRB_name GRB231028A
GCN_number 34914
Detection_method Swift-BAT Det
ra 214.0160°
decl 20.8970°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34914 SUBJECT: GRB 231028A: Swift-BAT refined analysis DATE: 23/10/30 17:03:43 GMT FROM: Tyler Parsotan at NASA GSFC H. A. Krimm (NSF), S. D. Barthelmy (GSFC), 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-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231028A (trigger #1193078) (Williams et al., GCN Circ. 34894). The BAT ground-calculated position is RA, Dec = 214.016, 20.897 deg which is RA(J2000) = 14h 16m 03.8s Dec(J2000) = +20d 53' 47.8" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 68%. The mask-weighted lightcurve shows a broad initial pulse with subsequent extended emission. T90 (15-350 keV) is 37.23 +- 0.98 sec (estimated error including systematics). The time-averaged spectrum from T-6.86 to T+41.95 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.40 +- 0.04. The fluence in the 15-150 keV band is 7.2 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+1.06 sec in the 15-150 keV band is 8.6 +- 0.4 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/1193078/BA/