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TITLE:   GCN CIRCULAR
NUMBER:  24777
SUBJECT: GRB 190610B: Fermi GBM Final Real-time Localization
DATE:    19/06/10 18:11:12 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 17:59:49 UT on 10 Jun 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190610B (trigger 581882394.908204 / 190610750).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 327.4, Dec = 42.4 (J2000 degrees, equivalent to J2000 21h 49m, 42d 23'), with a statistical uncertainty of 1.2 degrees.

The angle from the Fermi LAT boresight is 19.0 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190610750/quicklook/glg_skymap_all_bn190610750.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/bn190610750/quicklook/glg_healpix_all_bn190610750.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190610750/quicklook/glg_lc_medres34_bn190610750.gif

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TITLE:   GCN CIRCULAR
NUMBER:  24778
SUBJECT: GRB190610B: BALROG localization (Fermi Trigger 581882394 / GRB 190610750)
DATE:    19/06/10 18:23:18 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
581882394 at 17:59:49 on 10 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) = 327.4+/-1.7 deg
Decl.(2000.0) = 45.4+/-0.6 deg
We estimate an additional systematic error of 2 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB190610750/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB190610750/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB190610750/json

[GCN OPS NOTE(10jun19): Per author's request, the GRB name in the Subject
was changed from "GRB 190610A" to "GRB 190610B".]

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TITLE:   GCN CIRCULAR
NUMBER:  24789
SUBJECT: GRB 190610B: AstroSat CZTI detection
DATE:    19/06/12 06:19:37 GMT
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 190610B, which was also detected by Fermi GBM (GCN #24777), BALROG (Burgess J. et al., GCN # 24778) and Global MASTER-Net (Lipunov V. et al., GCN # 24779).

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 18:00:05.5 UT. The measured peak count rate associated with the burst is 346 cts/s above the background in the combined data of four quadrants, with a total of 1899 cts. The local mean background count rate was 548 cts/s. Using cumulative rates, we measure a T90 of 13.5 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.