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TITLE:   GCN CIRCULAR
NUMBER:  25519
SUBJECT: GRB 190828C: Fermi GBM Final Real-time Localization
DATE:    19/08/28 14:54:48 GMT
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 14:44:26 UT on 28 Aug 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190828C (trigger 588696271.447674 / 190828614).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 191.2, Dec = -58.8 (J2000 degrees, equivalent to J2000 12h 44m, -58d 47'), with a statistical uncertainty of 1.2 degrees.

The angle from the Fermi LAT boresight is 61.0 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828614/quicklook/glg_skymap_all_bn190828614.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/bn190828614/quicklook/glg_healpix_all_bn190828614.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190828614/quicklook/glg_lc_medres34_bn190828614.gif

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TITLE:   GCN CIRCULAR
NUMBER:  25520
SUBJECT: GRB 190828C: BALROG localization (Fermi Trigger 588696271 / GRB 190828614)
DATE:    19/08/28 15:07:58 GMT
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
588696271 at 14:44:26 on 28 Aug. 2019 were automatically fitted for spectrum
and sky location with the official 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) = 189.1+/-0.9 deg
Decl.(2000.0) = -59.7+/-0.6 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB190828614/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB190828614/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB190828614/json

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TITLE:   GCN CIRCULAR
NUMBER:  25745
SUBJECT: GRB 190828C: AstroSat CZTI detection
DATE:    19/09/14 06:46:33 GMT
FROM:    Ramkrishna Gaikwad at IUCAA/AstroSat  <ramkrishna@iucaa.in>

R. Gaikwad, 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 a GRB 190828C, which was also detected by Fermi GBM Final Real-time Localization (GCN #25519), BALROG localization (Burgess J. et al., GCN #25520).

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 2019-08-28 14:44:26.0 UT. The measured peak count rate associated with the burst is 436 cts/s above the background in the combined data of four quadrants, with a total of 3237 cts. The local mean background count rate was 674 cts/s. Using cumulative rates, we measure a T90 of 11 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.

[GCN OPS NOTE(14sep19), Per author's GCN Circ. 25746, the GRB name in the SUBJECT-line has been changed
from "190928C" to "190828C".]

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TITLE:   GCN CIRCULAR
NUMBER:  25746
SUBJECT: Correction in name: GRB 190828C (not GRB 190928C) : AstroSat CZTI detection
DATE:    19/09/14 06:56:48 GMT
FROM:    Ramkrishna Gaikwad at IUCAA/AstroSat  <ramkrishna@iucaa.in>

R. Gaikwad (IUCAA) report on behalf of the AstroSat CZTI team:

The GRB name of GRB 190828C (R. Gaikwad et al. GCN Circ. #25745) should be GRB 190828C.
I sincerely apologize for any confusion caused.