GRB 190609A
GCN Circular 24773
Subject
GRB 190609A: Fermi GBM Final Real-time Localization
Date
2019-06-09T07:45:52Z (6 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely LONG GRB
At 07:34:05 UT on 9 Jun 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190609A (trigger 581758450.25943 / 190609315).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 165.8, Dec = -50.8 (J2000 degrees, equivalent to J2000 11h 03m, -50d 47'), with a statistical uncertainty of 1.9 degrees.
The angle from the Fermi LAT boresight is 30.0 degrees.
The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190609315/quicklook/glg_skymap_all_bn190609315.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/bn190609315/quicklook/glg_healpix_all_bn190609315.fit
The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190609315/quicklook/glg_lc_medres34_bn190609315.gif
GCN Circular 24774
Subject
GRB190609A: BALROG localization (Fermi Trigger 581758450 / GRB 190609315)
Date
2019-06-09T08:06:38Z (6 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
J. Burgess, B. Biltzinger, F. Kunzweiler, F. Berlato & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
581758450 at 07:34:05 on 09 June 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) = 177.6+/-6.9 deg
Decl.(2000.0) = -46.4+/-3.9 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB190609315/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB190609315/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB190609315/json
GCN Circular 24804
Subject
GRB 190609A: AstroSat CZTI detection
Date
2019-06-13T09:39:49Z (6 years ago)
From
Prachee Ghumatkar at IUCAA/AstroSat <prachee@iucaa.in>
P. Ghumatkar, V. Sharma, D. Bhattacharya, T. Khanam and A. Vibhute (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 a long GRB 190609A, which was also detected by Fermi GBM (GCN #24773) and BALROG (Burgess J. et al., GCN #24774).
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 07:34:44.5 UT. The measured peak count rate associated with the burst is 555 cts/s above the background in the combined data of four quadrants, with a total of 7392 cts. The local mean background count rate was 521 cts/s. Using cumulative rates, we measure a T90 of 40.1 s. In preliminary analysis, we find that 550 Compton events are associated with this event.
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.