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This page lists all entries on GRB221017A in GRBweb

Summary IPN GCN 32777 GCN 32787 GCN 32790 GCN 32807 GCN 32813 GCN 32872

Summary table
Variable	Value	Source
T0	5:29:49 UTC	GCN_circulars,IPN Triangulation
ra	116.7542°	IPN
decl	39.2833°	IPN
pos_error	1.00e+00°	IPN
GBM_located	False
mjd	59869.22903935185	GCN_circulars,IPN Triangulation

IPN table
GRB_name	GRB221017A
ra	116.7542°
decl	39.2833°
pos_error	1.00e+00°

GCN 32777 table
GRB_name	GRB221017A
GCN_number	32777
Detection_method	MAXI Det
t_trigger	5:39:31 UTC
ra	116.8590°
decl	39.4090°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 32777 SUBJECT: GRB 221017A: MAXI/GSC detection DATE: 22/10/17 07:16:28 GMT FROM: Motoko Serino at Aoyama Gakuin U. S. Nawa(Chuo U.), M. Serino(AGU), H. Negoro, M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima (Nihon U.), T. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, H. Hiramatsu, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, J. Kohara, S. Urabe, N. Nemoto (Chuo U.), M. Shidatsu, M. Iwasaki (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa, Y. Imai, N. Ito, Y. Takamatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, T. Kurihara (JAXA), Y. Ueda, S. Ogawa, K. Setoguchi, T. Yoshitake, K. Inaba (Kyoto U.), M. Yamauchi, T. Sato, R. Hatsuda, R. Fukuoka, Y. Hagiwara, Y. Umeki (Miyazaki U.), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC) report on behalf of the MAXI team: The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 2022-10-17T05:39:31 UT. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (116.859 deg, 39.409 deg) = (07 47 26, +39 24 32) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.45 deg and 0.4 deg, respectively. The roll angle of long axis from the north direction is 83.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 109 +- 30 mCrab (4.0-10.0keV, 1 sigma error). Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners: (R.A., Dec) = (115.407, 38.740) deg = (07 41 37, +38 44 24) (J2000) (R.A., Dec) = (116.206, 38.225) deg = (07 44 49, +38 13 30) (J2000) (R.A., Dec) = (118.217, 40.060) deg = (07 52 52, +40 03 36) (J2000) (R.A., Dec) = (117.412, 40.589) deg = (07 49 38, +40 35 20) (J2000) There was no significant excess flux in the previous transit at 10/17 04:06 UT with an upper limit of 20 mCrab for each.

GCN 32787 table
GRB_name	GRB221017A
GCN_number	32787
Detection_method	IPN Triangulation
t_trigger	5:29:49 UTC
ra	116.9010°
decl	39.7420°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 32787 SUBJECT: IPN triangulation of GRB 221017A (long) DATE: 22/10/17 20:49:59 GMT FROM: Anna Ridnaia at Ioffe Institute A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars-Odyssey team, A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 221017A (MAXI/GSC detection: Nawa et al., GCN 32777) has been detected by MAXI (GSC), INTEGRAL (SPI-ACS), Konus-Wind, and Mars-Odyssey (HEND), so far, at about 19789 s UT (05:29:49). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 116.901 (07h 47m 36s) +39.742 (+39d 44' 32") Corners: 116.215 (07h 44m 52s) +41.438 (+41d 26' 15") 117.708 (07h 50m 50s) +38.402 (+38d 24' 08") 117.493 (07h 49m 58s) +37.908 (+37d 54' 28") 116.024 (07h 44m 06s) +40.992 (+40d 59' 30") --------------------------------------------- The error box area is 1.01 sq. deg, and its maximum dimension is 3.7 deg (the minimum one is 19 arcmin). The Sun distance was 91 deg. This box may be improved. The IPN localization is consistent with, but reduces the area of, the MAXI/GSC localization (GCN 32777). A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB221017_T19789/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.

GCN 32790 table
GRB_name	GRB221017A
GCN_number	32790
Detection_method	Swift Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 32790 SUBJECT: GRB 221017A: Swift ToO observations DATE: 22/10/18 13:50:15 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the MAXI GRB 221017A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021529 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the MAXI event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team.

GCN 32807 table
GRB_name	GRB221017A
GCN_number	32807
Detection_method	Swift-XRT Other
ra	116.8816°
decl	39.3449°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 32807 SUBJECT: GRB 221017A: Swift-XRT observations DATE: 22/10/20 14:42:17 GMT FROM: Phil Evans at U of Leicester J.P. Osborne (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), J. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the MAXI-detected burst GRB 221017A (Nawa et al. GCN Circ. 32777), collecting 1.9 ks of Photon Counting (PC) mode data between T0+196.7 ks and T0+225.8 ks. Two uncatalogued sources are detected: - Source 1 RA (J2000): 116.8816 = 07:47:31.58 Dec (J2000): 39.3449 = +39:20:41.5 Error: 10.7" (radius, 90% confidence) Avg. XRT count-rate: 5.4(+2.6,-2.0)x10^(-3) cts/s - Source 2 RA (J2000): 116.9220 = 07:47:41.27 Dec (J2000): 39.2614 = +39:15:41.2 Error: 10.0" (radius, 90% confidence) Avg. XRT count-rate: 3.3(+2.1,-1.5)x10^(-3) cts/s Both sources lie inside the overlap of the MAXI localization error box (Nawa et al. GCN Circ. 32777) and the IPN triangulation region (Kozyrev et al. GCN Circ. 32787). The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00021529. This circular is an official product of the Swift-XRT team.

GCN 32813 table
GRB_name	GRB221017A
GCN_number	32813
Detection_method	CALET
Circular_text	TITLE: GCN CIRCULAR NUMBER: 32813 SUBJECT: GRB 221017A: CALET Gamma-Ray Burst Monitor detection DATE: 22/10/21 15:48:27 GMT FROM: Yuta Kawakubo at Louisiana State U./CALET M. L. Cherry (LSU), A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The long GRB 221017A (MAXI/GSC detection: Nawa et al., GCN Circ. 32777; IPN triangulation: Kozyrev et al., GCN Circ 32787) was detected in the ground analysis of the CALET Gamma-ray Burst Monitor (CGBM) data around 05:29:49 UTC on October 17, 2022 (referenced to GCN Circ 32787). The burst signal was seen by all CGBM detectors. The burst light curve shows a multi-peaked structure that starts at T-20.5 sec, peaks at T+176.6 sec and ends at T+670.4 sec. The T90 and T50 durations measured by the SGM data are 191.9 +/- 44.4 sec and 52.7 +/- 0.5 sec (40-1000 keV), respectively. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1350019714/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.

GCN 32872 table
GRB_name	GRB221017A
GCN_number	32872
Detection_method	Konus-Wind Det
t_trigger	5:29:49.594 UTC
Circular_text	TITLE: GCN CIRCULAR NUMBER: 32872 SUBJECT: Konus-Wind detection of GRB 221017A DATE: 22/10/28 12:04:43 GMT FROM: Anna Ridnaia at Ioffe Institute A.Ridnaia, D. Frederiks, A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 221017A (MAXI/GSC detection: Nawa et al., GCN 32777; IPN triangulation: Kozyrev et al., GCN 32787; CALET/CGBM detection: Cherry et al., GCN 32813) triggered Konus-Wind at T0=19789.594 s UT (05:29:49.594). The burst light curve shows a multipeaked structure which starts at ~T0-19.1 s and has a total duration of ~332 s. The emission is seen up to ~6 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB221017_T19789/ As observed by Konus-Wind, the burst had a fluence of 3.90(-0.32,+0.32)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+175.872 s, of 9.62(-1.55,+1.56)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+312.320 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.99(-0.06,+0.07), the high energy photon index beta = -2.75(-0.46,+0.23), the peak energy Ep = 237(-15,+16) keV (chi2 = 119/98 dof). The spectrum near the maximum count rate (measured from T0+151.552 to T0+182.016 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.92(-0.04,+0.04), the high energy photon index beta = -2.98(-0.35,+0.22), the peak energy Ep = 288(-13,+13) keV (chi2 = 137/98 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.