| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB180416340 |
|
| T0 |
8:09:26.469 UTC |
Fermi_GBM |
| ra |
116.3100° |
Fermi_GBM |
| decl |
-48.5800° |
Fermi_GBM |
| pos_error |
3.05e+00° |
Fermi_GBM |
| T90 |
103.426 s |
Fermi_GBM |
| T90_error |
6.405 s |
Fermi_GBM |
| T90_start |
8:09:28.261 UTC |
Fermi_GBM |
| fluence |
3.88e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
2.22e-07 erg/cm² |
Fermi_GBM |
| T100 |
105.218 s |
|
| GBM_located |
True |
|
| mjd |
58224.3398896875 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB180416340 |
| trigger_name |
bn180416340 |
| ra |
116.3100° |
| decl |
-48.5800° |
| pos_error |
3.05e+00° |
| datum |
2018-04-16 |
| t_trigger |
8:09:26.469 UTC |
| T90 |
103.426 s |
| T90_error |
6.405 s |
| T90_start |
8:09:28.261 UTC |
| fluence |
3.88e-05 erg/cm² |
| fluence_error |
2.22e-07 erg/cm² |
| flux_1024 |
2.22e+01 erg/cm²/s |
| flux_1024_error |
3.72e-01 erg/cm²/s |
| flux_1024_time |
8.72e+01 erg/cm²/s |
| flux_64 |
2.59e+01 erg/cm²/s |
| flux_64_error |
1.57e+00 erg/cm²/s |
| GCN 22644 table |
|---|
| GRB_name |
GRB180416A |
| GCN_number |
22644 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
8:09:26.470 UTC |
| ra |
113.6500° |
| decl |
-49.1200° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 22644
SUBJECT: GRB 180416A: Fermi GBM detection
DATE: 18/04/16 15:46:33 GMT
FROM: Elisabetta Bissaldi at INFN,Bari
E. Bissaldi (Politecnico & INFN Bari)
reports on behalf of the Fermi GBM Team:
"At 08:09:26.47 UT on 16 April 2018, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 180416A (trigger 545558971 / 180416340).
The on-ground calculated location, using the GBM trigger data, is
RA = 113.65, Dec = -49.12 (J2000 degrees)
with an uncertainty of 1.0 degrees (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 angle from the Fermi LAT boresight at the GBM trigger time is 21 degrees.
The GBM light curve consists of multiple separated peaks
with a duration (T90) of about 103 s (50-300 keV).
The time-averaged spectrum from T0 s to T0+100 s is
adequately by a power law function with an exponential
high-energy cutoff. The power law index is -1.19 +/- 0.02 and
the cutoff energy, parameterized as Epeak, is 153 +/- 4 keV.
The event fluence (10-1000 keV) in this time interval is
(3.61 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+87.2 s in the 10-1000 keV band
is 22.2 +/- 0.4 ph/s/cm^2.
A Band function fits the spectrum equally well
with Epeak = 145 +/- 5 keV, alpha = -1.16 +/- 0.02 and
beta = -2.89 +/- 0.26.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|
| GCN 22688 table |
|---|
| GRB_name |
GRB180416A |
| GCN_number |
22688 |
| Detection_method |
AstroSat CZTI |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 22688
SUBJECT: GRB 180416A: AstroSat CZTI detection
DATE: 18/05/05 15:15:57 GMT
FROM: Vidushi Sharma at IUCAA
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 long GRB 180416A, which was also detected by Fermi-GBM (Bissaldi E. et al, GCN # 22644).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 08:10:54.5 UT, ~87 s after GBM trigger. The measured peak count rate is 420.5 cts/s above the background in combined data of four quadrants, with a total of 3904 cts. The local mean background count rate was 508.5 cts/s. Using cumulative rates, we measure a T90 of 92.6 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.
|