GRB221028A

This page lists all entries on GRB221028A in GRBweb

Summary IPN Swift GCN 32874 GCN 32876 GCN 32878 GCN 32879 GCN 32881 GCN 32883 GCN 32885 GCN 32886 GCN 32888 GCN 32889 GCN 32893 GCN 32894 GCN 32895 GCN 32896 GCN 32897 GCN 32898 GCN 32899 GCN 32904 GCN 32906

Summary table
Variable Value Source
T0 13:16:27 UTC GCN_circulars,Swift Det
ra 314.2027° Swift
decl 41.0898° Swift
pos_error 4.53e-04° Swift
T90 57.1 s Swift
T90_start 13:16:27 UTC Swift
fluence 1.51e-06 erg/cm² Swift
T100 57.1 s
GBM_located False
mjd 59880.553090277775 GCN_circulars,Swift Det
IPN table
GRB_name GRB221028A
ra 314.2042°
decl 41.0667°
pos_error 5.00e-02°
Swift table
GRB_name GRB221028A
t_trigger 13:16:27 UTC
ra 314.2027°
decl 41.0898°
pos_error 4.53e-04°
T90 57.1 s
fluence 1.51e-06 erg/cm²
GCN 32874 table
GRB_name GRB221028A
GCN_number 32874
Detection_method Swift Det
t_trigger 13:16:27 UTC
ra 314.2060°
decl 41.0660°
Circular_text TITLE: GCN CIRCULAR NUMBER: 32874 SUBJECT: GRB 221028A: Swift detection of a burst DATE: 22/10/28 13:32:46 GMT FROM: Jamie Kennea at Penn State U A. Y. Lien (U Tampa), E. Ambrosi (INAF-IASFPA), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), P. A. Evans (U Leicester), R. A. J. Eyles-Ferris (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), S. Laha (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), K. L. Page (U Leicester), D. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII), B. Sbarufatti (INAF-OAB), M. H. Siegel (PSU) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 13:16:27 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 221028A (trigger=1131910). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 314.206, +41.066 which is RA(J2000) = 20h 56m 49s Dec(J2000) = +41d 03' 56" 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 ~2300 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 13:18:03.7 UT, 96.1 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 314.20310, 41.08996 which is equivalent to: RA(J2000) = 20h 56m 48.74s Dec(J2000) = +41d 05' 23.9" with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 86 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 https://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 (7.76 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 2.3 (+2.57/-1.47) x 10^22 cm^-2 (90% confidence). The initial flux in the 2.5 s image was 8.64e-10 erg cm^-2 s^-1 (0.2-10 keV). UVOT data is unavailable at this time. Burst Advocate for this burst is A. Y. Lien (yarleen 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 32876 table
GRB_name GRB221028A
GCN_number 32876
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32876 SUBJECT: GRB 221028A: GIT optical upper limit DATE: 22/10/28 15:26:09 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay H. Kumar (IITB), G. Waratkar, V. Swain (IITB), Anirban Dutta (IIA), G. C. Anupama(IIA), K. Angail (IAO), V. Bhalerao (IITB), S. Barway (IIA) report on behalf of the GIT team: We observed GRB 221028A detected by Swift (A. Y. Lien et al. GCN # 32874) with 0.7m GROWTH-India Telescope (GIT). We obtained two 300-sec exposures in the r' filter. We did not detect any new source within a 5-arcsec radius uncertainty circle around the Swift-XRT position (A. Y. Lien et al. GCN # 32874) in our stacked image. The upper limit follows as: ------------------------------------------------------------------- JD (mid) | T_mid-T0(hrs) | Filter | Lim_Mag (5-sigma) | ------------------------------------------------------------------- 2459881.102968 | 1.2 | r' | > 20.24 | ------------------------------------------------------------------- The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction. The GROWTH India Telescope (GIT; Kumar et al. 2022 ) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.
GCN 32878 table
GRB_name GRB221028A
GCN_number 32878
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32878 SUBJECT: GRB 221028A: BOOTES-4/MET optical upper limit DATE: 22/10/28 16:03:30 GMT FROM: Youdong HU at IAA-CSIC Y.-D. Hu, E. Fernandez-Garcia, I. Perez-Garcia, A. J. Castro-Tirado, M. D. Caballero-Garcia, R. Sanchez-Ramirez (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga), S. Guziy (Univ. of Nikolaev) and D. R. Xiong, Y. F. Fan, J. M. Bai, C. J. Wang, Y. X. Xin, X. H. Zhao (Yunnan Observatories of CAS) on behalf of a larger collaboration, report: Following the detection of GRB 221028A by Swift (Lien et al. GCNC 32874), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) automatically responded to this burst starting on Oct. 28 at 13:24:22 UT (~8 min after trigger). No new source is detected within the XRT error region (Lien et al. GCNC 32874) in the co-added image (33 x 10 s, clear filter) down to 19.9 mag, which is consistent with the non-detection reported by GIT (Kumar et al., GCNC 32876). We thank the staff at Lijiang observatory for their excellent support.
GCN 32879 table
GRB_name GRB221028A
GCN_number 32879
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 32879 SUBJECT: Swift GRB 221028A: Global MASTER-Net observations report DATE: 22/10/28 18:16:35 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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. Gres, N.M. Budnev (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), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 221028A ( A. Y. Lien et al., GCN 32874) errorbox 17090 sec after notice time and 17113 sec after trigger time at 2022-10-28 18:01:41 UT, with upper limit up to 18.7 mag. Observations started at twilight. The observations began at zenith distance = 74 deg. The sun altitude is -13.0 deg. The galactic latitude b = -3 deg., longitude l = 83 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2137317 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 17203 | MASTER-SAAO | C | 180 | 18.4 | 17414 | MASTER-SAAO | C | 180 | 18.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 32881 table
GRB_name GRB221028A
GCN_number 32881
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32881 SUBJECT: GRB 221028A: LCOGT Optical Upper Limits DATE: 22/10/28 20:43:59 GMT FROM: Robert Strausbaugh at University of Minnesota R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on behalf of a larger collaboration: We observed the GRB 221028A (Lien et al., GCN 32874) field with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, on Tenerife, on October 28, from 19:17 to 19:44 (corresponding to 6.02 to 6.45 hours from the GRB trigger time) with the SDSS r and i filters. We performed a series of 3x300s exposures in each band. We do not detect any uncatalouged sources in the XRT error region, in either band, consistent with other optical upper limits (Kumar et al., GCN 32876; Hu et al., GCN 32878; Lipunov et al., GCN 32879). The following upper limits are calculated using the Pan-STARRS catalog as reference: r > 21.80 i > 21.62 These magnitudes are not corrected for galactic extinction.
GCN 32883 table
GRB_name GRB221028A
GCN_number 32883
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 32883 SUBJECT: GRB 221028A: MITSuME Okayama optical upper limits DATE: 22/10/29 07:02:15 GMT FROM: Masafumi Niwano at Tokyo Institute of Tech M. Niwano, R. Hosokawa, I.Takahashi, K. L. Murata, Y. Imai, N. Ito, S. Sato, N. Higuchi, M. Tateda, M. Sasada, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 221028A (A. Y. Lien et al. GCN Circular #32874, H. Kumar et al. GCN Circular #32876, Y.-D. Hu et al. GCN Circular #32878, V. Lipunov et al. GCN Circular #32879, R. Strausbaugh et al. GCN Circular #32881) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Okayama. The observation with a series of 60 sec exposures started at 2022-10-28 13:17:23 UT (59 seconds after the Swift/BAT trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the Swift/XRT error region (A. Y. Lien et al. GCN Circular #32874). We obtained the 5-sigma limits of the stacked images as follows. T0+[sec] | MID-UT | T-EXP[sec] | 5-sigma limits ------------------------------------------------------------------------------------------------ 59 | 2022-10-28 14:17:10 | 5790.0 | g'>18.7, Rc>19.5, Ic>18.7 ------------------------------------------------------------------------------------------------ T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).
GCN 32885 table
GRB_name GRB221028A
GCN_number 32885
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 32885 SUBJECT: GRB 221028A: AGILE detection DATE: 22/10/29 08:43:27 GMT FROM: Alessandro Ursi at INAF/IAPS A. Ursi, F. Longo (Univ. Trieste and INFN Trieste), C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, L. Foffano, E. Menegoni, G. Piano (INAF/IAPS), A. Bulgarelli, A. Di Piano, V. Fioretti, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli (SSDC, and INAF/OAR), M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), and P. Tempesta (TeleSpazio), report on behalf of the AGILE Team: The AGILE satellite detected the GRB 221028A at T0 = 2022-10-28 13:16:27 s (UTC), reported by Swift BAT (GCN #32874). The burst is clearly visible in the AGILE scientific ratemeters of the MiniCALorimeter (MCAL; 0.4-100 MeV) and AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 2 s and it released a total number of 3155 counts in the MCAL detector (above a background rate of 1180 Hz), and 7270 counts in the AC detector (above a background rate of 3410 Hz). The AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB221028A_AGILE_RM.png . The event also triggered a high time resolution MCAL data acquisition, from T0-4.31 s to T0+33.35 s (UTC), and released 1924 counts in the detector, above a background rate of 477 Hz. The MCAL light curve can be found at http://www.agilescienceapp.it/notices/GRB221028A_080686_594047787.000000.png . The time-integrated spectrum of the burst between T0-2s and T0+7s be fitted in the energy range 0.4-10 MeV with a power-law with ph. ind. = -2.65 (-0.39/+0.50), resulting in a reduced chi-squared of 0.78 (48 d.o.f.) and a fluence of 3.1e-06 ergs/cm^2 (90% confidence level), in the same energy range. At the T0, the event was 49 deg off-axis. Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html.
GCN 32886 table
GRB_name GRB221028A
GCN_number 32886
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32886 SUBJECT: GRB 221028A: HCT optical upper limit DATE: 22/10/29 08:49:36 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay H. Kumar (IITB), A. Dutta (IIA), D.K. Sahu (IIA), G. C. Anupama (IIA), S. Barway (IIA), V. Bhalerao (IITB), R. Gupta (ARIES), K. Misra (ARIES), D. Panchal (ARIES), S.B. Pandey (ARIES), report on behalf of the HCT team: We observed GRB 221028A detected by Swift-BAT (A. Y. Lien et al. GCN # 32874) with the 2.0m Himalayan Chandra Telescope (HCT) of the Indian Astronomical Observatory (IAO). We obtained exposures in the Bessel V, Rc and Ic filters and did not detect any afterglow within the Swift-XRT uncertainty circle (A. Y. Lien et al. GCN # 32874). The obtained upper limits follow as: ------------------------------------------------------------------- JD (mid) | T_mid-T0(hrs) | Exposure (sec) | Filter | Lim_mag (5-sigma) | ------------------------------------------------------------------- 2459881.075085 | 0.52 | 60 | Rc | > 19.94 | 2459881.091424 | 0.92 | 300 | Rc | > 22.06 | 2459881.1037215| 1.21 | 300 | Ic | > 20.74 | 2459881.108775 | 1.33 | 420 | V | > 22.30 | ------------------------------------------------------------------- The upper limits are consistent with Kumar et al., GCN #32876; Hu et al., GCN #32878; Lipunov et al., GCN #32879, R. Strausbaugh et al., GCN #32881. The reported magnitudes are in the AB system of magnitude, calibrated against PanSTARRS DR1 (Chambers et al., 2016) using Lupton's transformation equations available at http://classic.sdss.org/dr4/algorithms/sdssUBVRITransform.html#Lupton2005 and not corrected for Galactic extinction. These observations were carried out under the ToO program HCT-2022-C3-P12. We thank the HCT staff for their support during the observations. The Indian Astronomical Observatory is operated by the Indian Institute of Astrophysics, Bengaluru, India.
GCN 32888 table
GRB_name GRB221028A
GCN_number 32888
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 32888 SUBJECT: GRB 221028A: COATLI Upper Limits DATE: 22/10/29 17:43:28 GMT FROM: Alan M Watson at UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Rosa Becerra (UNAM), Simone Dichiara (PSU), Tzveti Dimitrova (ASU), Océlotl López (UNAM), Diego González (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Margarita Pereyra (UNAM), Eleonora Troja (UTV/ASU) and report: We observed the field of the GRB 221028A (Lien et al., GCN Circ. 32874) with the COATLI 50-cm telescope and HUITZI f/8 imager at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir ( http://coatli.astroscu.unam.mx) from 2022-10-29 02:13 UTC to 08:03 UTC (13.5 to 19.3 hours after the trigger), obtaining a total of 244 minutes of exposure in the r filter. At the position of the XRT afterglow (Lien et al., GCN Circ. 32874), we do not detect a source to the following 3-sigma upper limit: r > 23.4 Our photometry is calibrated against the Pan-STARRS1 catalog, is on an approximate AB system, and is not corrected for Galactic extinction in the direction of the GRB. We thank the COATLI/HUITZI technical team and the staff of the Observatorio Astronómico Nacional.
GCN 32889 table
GRB_name GRB221028A
GCN_number 32889
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 32889 SUBJECT: GRB 221028A: CrAO/ZTSh optical upper limit DATE: 22/10/29 20:04:27 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), N. Pankov (HSE), V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of IKI GRB FuN: We observed the GRB 221028A (Lien et al., GCN 32874; Ursi et al., GCN 32885) with ZTSh 2.6m telescope of CrAO observatory starting on Oct. 28 (UT) 19:38:37. We do not detect any optical object within XRT localization (Lien et al., GCN 32874). This is consistent with reported non-detections (Hu et al., GCN 32878; Kumar et al., GCN 32876; Lipunov et al., GCN 32879; Strausbaugh et al., GCN 32881; Niwano et al., GCN 32883; Kumar et al., GCN 32886; Watson et al., GCN 32888). Preliminary photometry of the field in a combined image is following Date UT start t-T0 Filter Exp. OT err UL(3sigma) (mid, days) (s) 2022-10-28 19:38:37 0.27233 R 10*120 n/d n/d 20.7 The photometry is based on several nearby USNO-B1.0 (R2) stars USNO-B1.0 RA DEC R2 20:56:40.7621 +41:04:57.000 15.60 20:56:51.9768 +41:04:22.922 17.21 20:57:00.0629 +41:02:55.072 16.04
GCN 32893 table
GRB_name GRB221028A
GCN_number 32893
Detection_method Swift-BAT Det
ra 314.1980°
decl 41.0820°
Circular_text TITLE: GCN CIRCULAR NUMBER: 32893 SUBJECT: GRB 221028A, Swift-BAT refined analysis DATE: 22/10/30 16:04:53 GMT FROM: Amy Lien at GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), 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 221028A (trigger #1131910) (Lien et al., GCN Circ. 32874). The BAT ground-calculated position is RA, Dec = 314.198, 41.082 deg which is RA(J2000) = 20h 56m 47.5s Dec(J2000) = +41d 04' 56.0" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 53%. The mask-weighted light curve shows a short pulse that starts and peaks at ~T0 and ends at ~T+2, followed by several overlapping pulses that lasts till ~T+84 s. The structure resembles those of short GRBs with extended emission. T90 (15-350 keV) is 57.1 +- 15.0 sec (estimated error including systematics). Due to current detector issues, data below ~50 keV are inaccurate. Thus, only data above 50 keV are used for spectral analysis. The time-averaged spectrum from T-0.1 to T+84.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.367 +- 0.325. The fluence in the 15-150 keV band is 1.51 +- 0.14 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.56 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/1131910/BA/
GCN 32894 table
GRB_name GRB221028A
GCN_number 32894
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 32894 SUBJECT: GRB 221028A: AKO Optical Upper Limit DATE: 22/10/30 20:24:14 GMT FROM: Mohammad Odeh at Al Khatim Observatory M44 Mohammad Odeh at Al-Khatim Astronomical Observatory (AKO), operated by the International Astronomical Center (IAC), in Abu Dhabi, the United Arab Emirates. We observed the GRB 221028A (Lien et al., GCN 32874) with our 0.36m telescope on 30 October from 15:39 to 16:44 (UT). We obtained exposures in the B, V, and Ic filters and did not detect any afterglow within XRT localization (Lien et al., GCN 32874). This is consistent with the reported non-detections of (Hu et al., GCN 32878; Lipunov et al., GCN 32879; Strausbaugh et al., GCN 32881; Niwano et al., GCN 32883; Kumar et al., GCN 32886; Watson et al., GCN 32888; Belkin et al., GCN 32889). Each image consists of seven stacked frames, each frame is a 3-minute exposure. The obtained upper limits are as follows: Mid Time (UT), Filter, Lim. Mag. 2022-10-30T16:16:06Z, B, > 18.3 2022-10-30T16:13:03Z, V, > 19.6 2022-10-30T16:09:22Z, Ic, > 20.2
GCN 32895 table
GRB_name GRB221028A
GCN_number 32895
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 32895 SUBJECT: GRB 221028A: Correction to GCN 32893 - Fluence and flux are for 50-150 keV DATE: 22/10/31 01:55:30 GMT FROM: Amy Lien at GSFC The fluence for the time averaged spectrum and the 1-s peak flux quoted in the BAT refined analysis for GRB 221028A (Palmer et al., GCN Circ. #32893) should be for the energy range of 50-150 keV, instead of the 15-150 keV written in the original circular. In other words, it should be "The fluence in the 50-150 keV band is 1.51 +- 0.14 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.56 sec in the 50-150 keV band is 0.8 +- 0.2 ph/cm2/sec." We apologize for the typos and any confusion this may cause.
GCN 32896 table
GRB_name GRB221028A
GCN_number 32896
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 32896 SUBJECT: GRB 221028A: NUTTelA-TAO / BSTI Early Optical Limits DATE: 22/10/31 02:35:10 GMT FROM: Toktarkhan Komesh at Nazarbayev University T. Komesh (NU), B. Grossan (UCB, NU), Z. Maksut (NU), M. Krugov (FAI), report on behalf of the Energetic Cosmos Laboratory: The Nazarbayev University Transient Telescope at Assy-Turgen Astrophysical Observatory (NUTTelA-TAO) observed the field of GRB 221028A on receipt of an automated GCN / BAT position alert, observing in Sloan g', r' and i' bands, with the Burst Simultaneous Three-Channel Imager (BSTI; Grossan, Kumar & Smoot 2019, JHEA, 32, 14).We started observations at UT 2022-10-28 13:47:19, 1852 s after the BAT trigger. Observations were made under partially cloudy conditions, beginning with the target at an altitude of 82 deg. No new or changing sources consistent with the XRT position (Lien 2022, GCN 32874) were detected. Note that these observations provide essentially full-time coverage, simultaneous in all three bands. We report the following results: start time t-t0(s) end time UL g' UL r' ULi' exposure_time (s) ------------ -------- ----------- ------ ------ ----- ------ 13:47:19 1852 13:48:19 19.3 18.9 18.7 60 13:48:19 1912 13:58:19 20.3 19.4 20.0 600 start time is in UT. t-t0(s) gives the time since trigger, in seconds. UL gives the 5 sigma upper limit sensitivity in magnitudes for an image withindividual exposure time (first row) and for images co-added to the given exposure time (second row). The given upper limit values are derived from the average calibration with only 2-4 standard stars per co-added frame, and no other analysis or corrections. ---------------------------------- NU = Nazarbayev University, Nur-Sultan, Kazakhstan UCB = University of California, Berkeley, USA FAI = Fesenkov Astrophysical Institute, Kazakhstan This research has been funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP14870504). The NUTTelA-TAO Team acknowledges the support of the staff of the Assy-Turgen Astrophysical Observatory, Almaty, Kazakhstan, and the Fesenkov Astrophysical Institute, Almaty, Kazkhstan.
GCN 32897 table
GRB_name GRB221028A
GCN_number 32897
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 32897 SUBJECT: GRB 221028A: NUTTelA-TAO / BSTI Early Optical Limits DATE: 22/10/31 02:47:47 GMT FROM: Toktarkhan Komesh at Nazarbayev University T. Komesh (NU), B. Grossan (UCB, NU), Z. Maksut (NU), M. Krugov (FAI), report on behalf of the Energetic Cosmos Laboratory: The Nazarbayev University Transient Telescope at Assy-Turgen Astrophysical Observatory (NUTTelA-TAO) observed the field of GRB 221028A on receipt of an automated GCN / BAT position alert, observing in Sloan g', r' and i' bands, with the Burst Simultaneous Three-Channel Imager (BSTI; Grossan, Kumar & Smoot 2019, JHEA, 32, 14). We started observations at UT 2022-10-28 13:47:19, 1852 s after the BAT trigger. Observations were made under partially cloudy conditions, beginning with the target at an altitude of 82 deg. No new or changing sources consistent with the XRT position (Lien 2022, GCN 32874) were detected. Note that these observations provide essentially full-time coverage, simultaneous in all three bands. We report the following results: start time t-t0(s) end time UL g' UL r' ULi' exposure_time (s) ------------ -------- ----------- ------ ------ ----- ------ 13:47:19 1852 13:48:19 19.3 18.9 18.7 60 13:48:19 1912 13:58:19 20.3 19.4 20.0 600 start time is in UT. t-t0(s) gives the time since trigger, in seconds. UL gives the 5 sigma upper limit sensitivity in magnitudes for an image with individual exposure time (first row) and for images co-added to the given exposure time (second row). The given upper limit values are derived from the average calibration with only 2-4 standard stars per co-added frame, and no other analysis or corrections. ---------------------------------- NU = Nazarbayev University, Nur-Sultan, Kazakhstan UCB = University of California, Berkeley, USA FAI = Fesenkov Astrophysical Institute, Kazakhstan This research has been funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP14870504). The NUTTelA-TAO Team acknowledges the support of the staff of the Assy-Turgen Astrophysical Observatory, Almaty, Kazakhstan, and the Fesenkov Astrophysical Institute, Almaty, Kazkhstan.
GCN 32898 table
GRB_name GRB221028A
GCN_number 32898
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 32898 SUBJECT: GRB 221028A: 1.3m DFOT Optical upper limit DATE: 22/10/31 07:20:02 GMT FROM: Amit Kumar Ror at ARIES Amit Kumar Ror, Snehlata, Rahul Gupta, S. B. Pandey, Amar Aryan, Ankur Ghosh, Dimple, and Kuntal Misra (ARIES) report: We observed Swift-BAT detected GRB 221028A (Lien et al. GCN 32874) using the 2Kx2K CCD Imager mounted on the 1.3m Devasthal Fast Optical Telescope (DFOT) located at the Devasthal observatory of Aryabhatta Research Institute of Observational Sciences (ARIES), India. The observations were started on 2022-10-28 at 15:17:46, i.e., around 2 hours after the BAT trigger. We have taken multiple frames, each having an exposure time of 300 sec in the R filter. We did not detect any new source within the XRT error circle in our stacked image. We obtain the following 3-sigma upper limit in the stacked image. Date Start (UT) T_start-T0 (hours) Filter Exp time (sec) Limiting magnitude =============================================================== 2022-10-28 15:17:46 ~2 R 300x6 > 21.5 The magnitude is not corrected for the Galactic extinction in the direction of the burst. Photometric calibration is performed using the standard stars from the USNO-B1.0 catalog. The non-detection of the optical afterglow is consistent with Kumar et al. GCNs 32876, 32886; Hu et al. GCN 32878; Lipunov et al. GCN 32879; Strausbaugh et al. GCN 32881; Niwano et al. GCN 32883; Watson et al. GCN no. 32888; Belkin et al. GCN 32889; Odeh GCN 32894; and Komesh et al. GCN 32897. This circular may be cited.
GCN 32899 table
GRB_name GRB221028A
GCN_number 32899
Detection_method Swift-XRT Other
ra 314.2027°
decl 41.0898°
Circular_text TITLE: GCN CIRCULAR NUMBER: 32899 SUBJECT: GRB 221028A: Swift-XRT refined Analysis DATE: 22/10/31 07:29:01 GMT FROM: Phil Evans at U of Leicester V. D'Elia (SSDC & INAF-OAR), D.N. Burrows (PSU), J. D. Gropp (PSU), S. Dichiara (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), B. Sbarufatti (INAF-OAB), A. D'Ai (INAF-IASFPA) and A.Y. Lien report on behalf of the Swift-XRT team: We have analysed 5.6 ks of XRT data for GRB 221028A (Lien et al. GCN Circ. 32874), from 92 s to 28.1 ks after the BAT trigger. The data comprise 23 s in Windowed Timing (WT) mode (the first 2 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 314.2027, +41.0898 which is equivalent to: RA (J2000): 20 56 48.64 Dec(J2000): +41 05 23.3 with an uncertainty of 3.5 arcsec (radius, 90% confidence). The light curve can be modelled with a power-law decay with a decay index of alpha=2.04 (+0.13, -0.12). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.5 (+0.5, -0.4). The best-fitting absorption column is 2.4 (+1.0, -0.8) x 10^22 cm^-2, in excess of the Galactic value of 7.8 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 8.2 x 10^-11 (1.3 x 10^-10) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2.4 (+1.0, -0.8) x 10^22 cm^-2 Galactic foreground: 7.8 x 10^21 cm^-2 Excess significance: 3.3 sigma Photon index: 1.5 (+0.5, -0.4) If the light curve continues to decay with a power-law decay index of 2.04, the count rate at T+24 hours will be 8.3 x 10^-6 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.8 x 10^-16 (1.1 x 10^-15) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01131910. This circular is an official product of the Swift-XRT team.
GCN 32904 table
GRB_name GRB221028A
GCN_number 32904
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 32904 SUBJECT: GRB 221028A: Detection by VZLUSAT-2 DATE: 22/11/01 18:05:11 GMT FROM: Jakub Ripa at Masaryk University <245487@mail.muni.cz> 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, M. Dafcikova, 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. A long-duration GRB 221028A (Swift/BAT detection: Lien et al., GCN Circ. 32874; AGILE detection: Ursi et al., GCN Circ. 32885; KONUS-Wind detection: trig. time 2022-10-28 13:16:29.550 UT; INTEGRAL/SPI-ACS detection peak at 2022-10-28 13:16:28.3 UT) was detected by both GRB detector units on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/). The data acquisition was performed by GRB detector units no. 0 and no. 1. The 7.1 (6.1) sigma detection significance was confirmed at detector unit no. 0 (no. 1) at 2022-10-28 13:16:26 UTC. The T90 duration was measured to be 23 s (26 s) for detector unit no. 0 (no. 1). The light curve obtained by VZLUSAT-2 is available here: https://vzlusat2.konkoly.hu/static/share/GRB221028A_GCN_VZLUSAT2.pdf GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSats 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 32906 table
GRB_name GRB221028A
GCN_number 32906
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 32906 SUBJECT: GRB 221028A: GRANDMA observations DATE: 22/11/03 14:55:19 GMT FROM: Alexander Kann at IAA-CSIC N. Kochiashvili (AbAO), Z. Vidadi (ShAO), D. A. Kann (Goethe Univ.), P. Gokuldass (Florida Tech.), S. Beradze (AbAO), Sh. Aghayeva (ShAO), R. Le Montagner (IJCLab), C. Rinner, Z. Benkhaldoun (OUCA), A.Janati (HAO), S. Antier (OCA/Artemis), J. Ali, A. Kaeouach (KNC), and Sergey Karpov (FZU) report on behalf of the GRANDMA collaboration: The GRANDMA telescope network responded to the Swift-BAT alert of GRB 221028A (Lien et al., GCN 32874, Palmer et al., GCN 32893, D'Elia et al., GCN 32899), which was also detected by AGILE (Ursi et al., GCN 32885) and VZLUSAT-2 (Ripa et al., GCN 32904). The first observations started 5.43 hours after the BAT trigger time. The optical counterpart of the afterglow was not detected in our observations. In the following table we report the preliminary photometry of our observations. Upper limits are reported at the 5-sigma limit, in the AB system. T-T0 (hr)| MJD | Obser. |Exposure | Filter| Upp.Lim. (AB) -------------------------------------------------------------------- 5.4341 |59880.77951| MOSS | 60 x 60 s | Clear | 21.5 5.8778 |59880.79591| KNC-HAO | 47 x 180 s | L | 22.0 MOSS data has been calibrated with the Gaia DR2 catalog. HAO data has been calibrated with PS1 catalog. Values are not corrected for the very large Galactic extinction E(B-V) = 1.8573 mag (Schlafly & Finkbeiner 2011). Our upper limits are in agreement with other non-detections from Swift UVOT (Lien et al., GCN 32874), GIT (Kumar et al., GCN 32876), BOOTES-4/MET (Hu et al., GCN 32878), MASTER (Lipunov et al., GCN 32879), LCOGT (Strausbaugh et al., GCN 32881), MITSuME (Niwano et al., GCN 32883), HCT (Kumar et al., GCN 32886), COATLI (Watson et al., GCN 32888), ZTSh 2.6m (Belkin et al., GCN 32889), AKO (Odeh et al., GCN 32894), NUTTelA-TAO/BSTI (Komesh et al., GCN 32896, 32897), and DFOT (Kumar et al., GCN 32898). GRANDMA is a worldwide coordinated telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).