GRB190828A

This page lists all entries on GRB190828A in GRBweb

Summary IPN GCN 25502 GCN 25529 GCN 25542

Summary table
Variable Value Source
T0 7:58:01 UTC GCN_circulars,MAXI Det
ra 58.0708° IPN
decl 46.5500° IPN
pos_error 1.00e+00° IPN
GBM_located False
mjd 58723.33195601852 GCN_circulars,MAXI Det
IPN table
GRB_name GRB190828A
ra 58.0708°
decl 46.5500°
pos_error 1.00e+00°
GCN 25502 table
GRB_name GRB190828A
GCN_number 25502
Detection_method MAXI Det
t_trigger 7:58:01 UTC
ra 58.0110°
decl 46.4480°
Circular_text TITLE: GCN CIRCULAR NUMBER: 25502 SUBJECT: GRB 190828A: MAXI/GSC detection DATE: 19/08/28 08:44:15 GMT FROM: Satoshi Sugita at Aoyama Gakuin U. S. Sugita, H. Nishida, M. Serino (AGU), H. Negoro (Nihon U.), K. Asakura (Osaka U.), M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, A. Yoshida (AGU), W. Iwakiri, Y. Tsuboi, R. Sasaki, H. Kawai, T. Sato (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Sugizaki, M. Oeda, K. Shiraishi (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, N.Isobe, R. Shimomukai, M. Tominaga (JAXA), Y. Ueda, A. Tanimoto, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake (Kyoto U.), H. Tsunemi, T. Yoneyama, S. Ide (Osaka U.), M. Yamauchi, S. Iwahori, Y. Kurihara, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU) report on behalf of the MAXI team: The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 07:58:01 UT on 2019 August 28. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (58.011 deg, 46.448 deg) = (03 52 02, +46 26 52) (J2000) with a 90% C.L. statistical error of 0.25 deg and an additional systematic uncertainty of 0.1 deg (90% containment radius). Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners: (56.303, 46.041) deg = (03 45 12, +46 02 27) (J2000) (56.644, 45.605) deg = (03 46 34, +45 36 17) (J2000) (60.044, 46.816) deg = (04 00 10, +46 48 57) (J2000) (59.724, 47.262) deg = (03 58 53, +47 15 43) (J2000) The X-ray flux averaged over the scan was 193 +- 27 mCrab (4.0-10.0keV, 1 sigma error).
GCN 25529 table
GRB_name GRB190828A
GCN_number 25529
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 25529 SUBJECT: GRB 190828A: Tiled Swift observations DATE: 19/08/28 21:25:46 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a series of observations, tiled on the sky, of the MAXI GRB 190828A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00086 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the MAXI event is high: 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 25542 table
GRB_name GRB190828A
GCN_number 25542
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 25542 SUBJECT: GRB 190828A: Swift-XRT observations DATE: 19/08/29 09:46:09 GMT FROM: Paolo D'Avanzo at INAF - OAB J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), B. Sbarufatti (PSU), D.N. Burrows (PSU) 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 190828A (Sugita et al. GCN Circ. 25502) in a series of observations tiled on the sky. The total exposure time is 1.3 ks, distributed over 7 tiles; the maximum exposure at a single sky location was 393 s. The data were collected between T0+48.4 ks and T0+49.8 ks, and are entirely in Photon Counting (PC) mode. No X-ray sources have been detected. The 3-sigma upper limit in the field (not including the regions where the tiles overlap) ranges from ~0.02 to ~0.15 ct s^-1, corresponding to a 0.3-10 keV observed flux of 9.9e-13 to 5.8e-12 erg cm^-2 s^-1 (assuming a typical GRB spectrum). The results of the XRT-team automatic analysis of the tiled XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00086. This circular is an official product of the Swift-XRT team.