//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25259 SUBJECT: GRB 190804A: Fermi GBM Final Real-time Localization DATE: 19/08/04 01:35:19 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 01:23:27 UT on 4 Aug 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190804A (trigger 586574612.354622 / 190804058). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 108.0, Dec = -64.9 (J2000 degrees, equivalent to J2000 07h 12m, -64d 54'), with a statistical uncertainty of 12.0 degrees. The angle from the Fermi LAT boresight is 117.0 degrees. The skymap can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190804058/quicklook/glg_skymap_all_bn190804058.png The HEALPix FITS file, including the estimated localization systematic, can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190804058/quicklook/glg_healpix_all_bn190804058.fit The GBM light curve can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190804058/quicklook/glg_lc_medres34_bn190804058.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25262 SUBJECT: GRB 190804B: MAXI/GSC detection DATE: 19/08/04 12:00:58 GMT FROM: Hitoshi Negoro at Nihon U T. Sato (Chuo U.), H. Negoro, M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, H. Nishida, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai (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, K. Asakura, 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 on an uncatalogued X-ray transient source at 07:58:15 UT on 2019 August 04. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (239.895 deg, -44.773 deg) = (15 59 34, -44 46 22) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.29 deg and 0.24 deg, respectively. The roll angle of the long axis from the north direction is 39.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 118 +- 21 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) = (240.071, -43.705) deg = (16 00 17, -43 42 17) (J2000) (R.A., Dec) = (239.431, -43.730) deg = (15 57 43, -43 43 47) (J2000) (R.A., Dec) = (239.594, -45.994) deg = (15 58 22, -45 59 38) (J2000) (R.A., Dec) = (240.259, -45.968) deg = (16 01 02, -45 58 04) (J2000) There was no significant excess flux in the previous transit at 06:25 UT, and in the next transit at 09:30 UT with an upper limit of 20 mCrab for each. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25263 SUBJECT: GRB 190804B: Tiled Swift observations DATE: 19/08/04 18:18:21 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 190804B. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00082 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25264 SUBJECT: GRB 190804C: Fermi GBM Final Real-time Localization DATE: 19/08/04 19:11:39 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 19:00:37 UT on 4 Aug 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190804C (trigger 586638042.518414 / 190804792). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 97.8, Dec = 42.3 (J2000 degrees, equivalent to J2000 06h 31m, 42d 17'), with a statistical uncertainty of 4.4 degrees. The angle from the Fermi LAT boresight is 98.0 degrees. The skymap can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190804792/quicklook/glg_skymap_all_bn190804792.png The HEALPix FITS file, including the estimated localization systematic, can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190804792/quicklook/glg_healpix_all_bn190804792.fit The GBM light curve can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190804792/quicklook/glg_lc_medres34_bn190804792.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25265 SUBJECT: GRB 190804C: BALROG localization (Fermi Trigger 586638042 / GRB 190804792) DATE: 19/08/04 19:22:56 GMT FROM: Jochen Greiner at MPE,Garching B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 586638042 at 19:00:37 on 04 Aug. 2019 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60). The best-fit position (1 sigma statistical errors) is: RA(2000.0) = 86.4+/-4.1 deg Decl.(2000.0) = 46.0+/-2.1 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB190804792/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB190804792/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB190804792/json //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25267 SUBJECT: MAXI GRB190804.33 Global MASTER-Net observations report DATE: 19/08/04 21:01:05 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias) D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (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) started inspect of the MAXI GRB190804.33 (trigger No 6992871870, 15h 57m 44.64s , -44d 23m 13.20s, R=1) errorbox 32405 sec after trigger time at 2019-08-04 16:58:20 UT, with upper limit up to 19.5 mag. Observations started at twilight. The observations began at zenit distance = 14 deg. The sun altitude is -11.8 deg. MASTER-IAC robotic telescope located in Spain (IAC Teide Observatory) started inspect of the MAXI GRB190804.33 errorbox 45665 sec after trigger time at 2019-08-04 20:39:20 UT, with upper limit up to 16.4 mag. Observations started at twilight. The observations began at zenit distance = 72 deg. The sun altitude is -10.7 deg. The galactic latitude b = -60 deg., longitude l = 98 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1095913 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 32436 | 2019-08-04 16:58:20 | MASTER-SAAO | ( 15h 52m 08.48s , -43d 54m 03.18s) | C | 60 | 18.2 | 32592 | 2019-08-04 16:59:56 | MASTER-SAAO | ( 15h 57m 42.32s , -44d 17m 23.77s) | C | 180 | 19.1 | 32755 | 2019-08-04 17:03:39 | MASTER-SAAO | ( 15h 50m 50.95s , -43d 54m 24.34s) | C | 60 | 18.5 | 32851 | 2019-08-04 17:05:15 | MASTER-SAAO | ( 16h 1m 58.45s , -43d 54m 38.91s) | C | 60 | 18.8 | 33008 | 2019-08-04 17:06:52 | MASTER-SAAO | ( 16h 2m 51.67s , -44d 16m 44.63s) | C | 180 | 19.5 | 33167 | 2019-08-04 17:10:31 | MASTER-SAAO | ( 16h 3m 07.03s , -43d 54m 23.19s) | C | 60 | 18.9 | 45696 | 2019-08-04 20:39:20 | MASTER-IAC | ( 16h 0m 30.33s , -43d 56m 36.85s) | C | 60 | 16.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25273 SUBJECT: GRB 190804B: Swift-XRT observations DATE: 19/08/05 08:58:34 GMT FROM: Andy Beardmore at U Leicester J.P. Osborne (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (ASDC), V. D'Elia (ASDC), A. Tohuvavohu (PSU), J.A. Kennea (PSU), B. Sbarufatti (PSU), K.L. Page (U. Leicester), A.P. Beardmore (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 190804B (Sato et al. GCN Circ. 25262) 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 395 s. The data were collected between T0+37.2 ks and T0+38.6 ks, and are entirely in Photon Counting (PC) mode. Two uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below: Source 1: RA (J2000.0): 239.7568 = 15:59:1.62 Dec (J2000.0): -44.6361 = -44:38:09.8 Error: 4.1 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: 0.031 [+0.014, -0.011] ct s^-1 Distance: 606 arcsec from MAXI position. Flux: (1.38 [+0.60, -0.46])e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 2: RA (J2000.0): 240.0251 = 16:00:6.02 Dec (J2000.0): -44.7816 = -44:46:53.9 Error: 3.9 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: 0.113 [+0.038, -0.031] ct s^-1 Distance: 333 arcsec from MAXI position. Flux: (5.1 [+1.7, -1.4])e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV) 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_GRB00082. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25286 SUBJECT: GRB 190804B: Swift-XRT afterglow detection DATE: 19/08/08 08:43:25 GMT FROM: Andy Beardmore at U Leicester J.P. Osborne (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (ASDC), V. D'Elia (ASDC), A. Tohuvavohu (PSU), J.A. Kennea (PSU), B. Sbarufatti (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has conducted further observations of the field of the MAXI-detected burst GRB 190804B (Sato et al. GCN Circ. 25262). The observations now extend from T0+37.2 ks to T0+273.4 ks. Of the sources reported by Osborne et al. (GCN Circ. 25273), "Source 2" has faded from 1.1e-01 count/s to 1.1e-03 count/s between observations and is believed to be the afterglow. The position of this source (astrometrically enhanced by using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) is RA, Dec=240.0251, -44.7816 which is equivalent to: RA (J2000): 16:00:6.02 Dec(J2000): -44:46:53.9 with an uncertainty of 3.8 arcsec (radius, 90% confidence). Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 177). This position is 5.6 arcmin from the MAXI position. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020916. The results of the full analysis of the tiled XRT observations are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00082. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25289 SUBJECT: GRB 190804A: AstroSat CZTI detection DATE: 19/08/08 12:06:02 GMT FROM: Prachee Ghumatkar at IUCAA/AstroSat P. Ghumatkar, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data showed the detection of GRB 190804A, which was also detected by Fermi GBM (GCN #25259) and Global MASTER-Net (Lipunov V. et al., GCN #25260). The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with the strongest peak at 01:23:28.0 UT. The measured peak count rate associated with the burst is 149 cts/s above the background in the combined data of four quadrants, with a total of 298 cts. The local mean background count rate was 535 cts/s. Using cumulative rates, we measure a T90 of 2 s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.