GRB 190215A

B. Mailyan (UAH) and C. Meegan (UAH)
 report on behalf of the Fermi GBM Team:

"At 18:31:22.48 UT on 15 February 2019, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 190215A (trigger 571948287 / 190215772).
The on-ground calculated location, using the GBM trigger data, is

RA, Dec = 340.4, +37.5 (J2000 degrees)

with an uncertainty of 1.0 degree (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which we have characterized as a core-plus-tail model, with 90% of
GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg
systematic error. [Connaughton et al. 2015, ApJS, 216, 32]).

The initial angle from the Fermi LAT boresight to
the best location is 25 degrees.

The GBM light curve consists of a bright FRED-like peak with multiple
pulses within it,
with a duration (T90) of about 23 s (50-300 keV).
The time-averaged spectrum from T0+0 s to T0+23 s is
best fit by a power law function with an exponential
high-energy cutoff.  The power law index is -0.18 +/- 0.03 and
the cutoff energy, parameterized as Epeak, is 204 +/- 4 keV.

The event fluence (10-1000 keV) in this time interval is
(2.0 +/- 0.3)E-05  erg/cm^2. The 1s peak photon flux measured
starting from T0+5.8 s in the 10-1000 keV band
is 8.7 +/- 0.3 ph/s/cm^2.

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."

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 2019-02-15T18:31:22.000 (T0), the Insight-HXMT/HE detected
GRB 190215A(trigger ID: HEB190215771) in a routine search of the data,
which was also triggered by Fermi/GBM (B. Mailyan et al., GCN 23898
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 ).

The Insight-HXMT/HE light curve mainly consists of two 
pulses with a duration (T90) of 14.80 s measured from T0+1.22 s.
The 1-ms peak rate, measured from T0+6.155 s, is 3193.6 cnts/sec.
The total counts from this burst is 28093.7 counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB190215771_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 (record 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
fundedjointly 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.



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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 long GRB 190215A, which was also detected by Fermi/GBM (Mailyan B. et al., GCN # 23898) and Insight-HXMT/HE (Yi Q. B. et al., GCN # 23899).

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with strongest peak at 18:31:29.5 UT, about 7 s after the Fermi/GBM trigger time. The measured peak count rate associated with the burst is 273 cts/s above the background in the combined data of four quadrants, with a total of 2683 cts. The local mean background count rate was 506 cts/s. Using cumulative rates, we measure a T90 of 23 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.