GRB 190525A
GCN Circular 24662
Subject
GRB 190525A: Fermi GBM Final Real-time Localization
Date
2019-05-25T00:57:35Z (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 SHORT GRB
At 00:45:47 UT on 25 May 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190525A (trigger 580437952.651712 / 190525032).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 338.0, Dec = 5.5 (J2000 degrees, equivalent to J2000 22h 32m, 5d 30'), with a statistical uncertainty of 4.0 degrees.
The angle from the Fermi LAT boresight is 43.0 degrees.
The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190525032/quicklook/glg_skymap_all_bn190525032.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/bn190525032/quicklook/glg_healpix_all_bn190525032.fit
The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190525032/quicklook/glg_lc_medres34_bn190525032.gif
GCN Circular 24665
Subject
GRB 190525A: Insight-HXMT/HE detection
Date
2019-05-27T00:07:03Z (6 years ago)
From
Ce Cai at IHEP <caice@ihep.ac.cn>
C. Cai, S. Xiao, Q. Luo, Q. B. Yi, C. K. Li,
X. B. Li, G. Li, J. Y. Liao, S. L. Xiong,
C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu,
A. M. Zhang, Y. F. Zhang, 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 2019-05-25T00:45:47.65 (T0), Insight-HXMT/HE detected
GRB 190525A(trigger ID: HEB190525031) in a routine search of the data,
which was also triggered by Fermi/GBM (GCN #24662).
The Insight-HXMT/HE light curve mainly consists of single
pulse with a duration (T90) of 0.90 s measured from T0-0.20 s.
The 1-ms peak rate, measured from T0+0.53 s, is 1719 cnts/sec.
The total counts from this burst is 753 counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB190525031_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.
GCN Circular 24667
Subject
GRB 190525A: AstroSat CZTI detection
Date
2019-05-27T08:49:16Z (6 years ago)
From
Prachee Ghumatkar at IUCAA/AstroSat <prachee@iucaa.in>
P. Ghumatkar, V. Sharma, T. Khanam, D. Bhattacharya 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 short GRB 190525A, which was also detected by Fermi GBM (GCN #24662), Global MASTER-Net (GCN #24663) and Insight-HXMT/HE (GCN #24665).
The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range at 00:45:47 UTC.
The CZTI light curve shows a weak detection in the 40-200 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.