GRB 190915A

The Fermi GBM team reports the detection of a likely LONG GRB

At 05:44:57 UT on 15 Sep 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190915A (trigger 590219102.911008 / 190915240).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 48.3, Dec = 4.0 (J2000 degrees, equivalent to J2000 03h 13m, 4d 00'), with a statistical uncertainty of 4.3 degrees.

The angle from the Fermi LAT boresight is 75.0 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190915240/quicklook/glg_skymap_all_bn190915240.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/bn190915240/quicklook/glg_healpix_all_bn190915240.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190915240/quicklook/glg_lc_medres34_bn190915240.gif

F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
590219102 at 05:44:57 on 15 Sept. 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) = 54.2+/-4.5 deg
Decl.(2000.0) = 7.2+/-3.1 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB190915240/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB190915240/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB190915240/json

V. Lipunov, E. Gorbovskoy, V.Kornilov, F.Balakin, N.Tyurina,P.Balanutsa,A.Kuznetsov, 
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov,V.Senik, T.Pogrosheva, K.Pozdnyakov,
A.Chasovnikov, V.Topolev, 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 Global Robotic Net (http://observ.pereplet.ru, Lipunov et al., 2010,Advances in Astronomy, vol.2010, 30L)
started inspect of Fermi  GRB190916A (GBM team GCN 25750
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 , Trig.N 590219102, Ttrig=05:44:57 UT on 15 Sep 2019 )
BALROG localization (Kunzweiler et al. GCN 25751
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 , R.A.,Dec(2000)=54.2+/-4.5 , 7.2+/-3.1 )
12 sec after notice time at MASTER-IAC, MASTER-OAFA, MASTER-SAAO.

MASTER-IAC robotic telescope located in Spain (IAC Teide Observatory)
started inspect of the FERMI GRB 190915A BALROG localization 12 sec after notice time 
(1594 sec after trigger time) at 2019-09-15 06:11:31 UT, with upper limit up to  17.6 mag.
Observations started at twilight.  The observations began at zenit distance = 26 deg. The sun  altitude  is -8.8 deg.

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University)
started inspect of the FERMI GRB 190915A BALROG localization 25 sec after  notice time (1607 sec after trigger time)
  at 2019-09-15 06:11:44 UT, with upper limit up to  17.7 mag.
The observations began at zenit distance = 52 deg. The sun  altitude  is -53.4 deg.

MASTER-SAAO robotic telescope  located in South Africa (South African 
Astronomical Observatory) started inspect of the Fermi GRB 190915A BALROG localization 
at 2019-09-15 21:31:37 UT, with upper limit up to  18.9 mag. The observations 
began at zenit distance = 77 deg. The sun  altitude  is -57.5 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/event.php?id=1136619

The observation and reduction will be continued.
The message may be cited.

Y. G. Zheng, C. Cai, Q. Luo, S. Xiao, Q. B. Yi, 
Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, S. L. Xiong,
C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, 
Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, 
Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, 
M. Wu, Y. P. Xu, S. N. Zhang (IHEP), 
report on behalf of the Insight-HXMT team:

At 2019-09-15T05:44:58.40 (T0), Insight-HXMT/HE detected 
GRB 190915A (trigger ID: HEB190915239) in a routine search of the data, 
which was also triggered by Fermi/GBM (GCN #25750
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 ).

The Insight-HXMT/HE light curve mainly consists of a single  
pulse with a duration (T90) of 13.66 s measured from T0-1.75 s. 
The 1-ms peak rate, measured from T0-0.07 s, is 1427 cnts/sec. 
The total counts from this burst is 8974 counts. 
URL_LC: http://www.hxmt.org/images/GRB/HEB190915239_lc.jpg 

All measurements above are made with the CsI detectors operating in the 
regular mode with the energy range of about 80-800 keV (deposited energy). 
Only gamma-rays with energy greater than about 200 keV can penetrate 
the spacecraft and leave signals in the CsI detectors installed inside 
of the telescope. 

Insight-HXMT is the first Chinese space X-ray telescope, which was 
funded jointly by the China National Space Administration (CNSA) and 
the Chinese Academy of Sciences (CAS). 
More information about it could be found at: 
http://www.hxmt.org.