| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB180505540 |
|
| T0 |
12:57:09.907 UTC |
Fermi_GBM |
| ra |
4.5100° |
Fermi_GBM |
| decl |
-59.8900° |
Fermi_GBM |
| pos_error |
2.56e+00° |
Fermi_GBM |
| T90 |
21.76 s |
Fermi_GBM |
| T90_error |
0.923 s |
Fermi_GBM |
| T90_start |
12:57:11.699 UTC |
Fermi_GBM |
| fluence |
2.01e-05 erg/cm² |
Fermi_GBM |
| fluence_error |
1.06e-07 erg/cm² |
Fermi_GBM |
| T100 |
23.552 s |
|
| GBM_located |
True |
|
| mjd |
58243.53969799769 |
Fermi_GBM |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB180505540 |
| trigger_name |
bn180505540 |
| ra |
4.5100° |
| decl |
-59.8900° |
| pos_error |
2.56e+00° |
| datum |
2018-05-05 |
| t_trigger |
12:57:09.907 UTC |
| T90 |
21.76 s |
| T90_error |
0.923 s |
| T90_start |
12:57:11.699 UTC |
| fluence |
2.01e-05 erg/cm² |
| fluence_error |
1.06e-07 erg/cm² |
| flux_1024 |
2.92e+01 erg/cm²/s |
| flux_1024_error |
8.00e-01 erg/cm²/s |
| flux_1024_time |
2.05e+01 erg/cm²/s |
| flux_64 |
3.85e+01 erg/cm²/s |
| flux_64_error |
3.60e+00 erg/cm²/s |
| GCN 22689 table |
|---|
| GRB_name |
GRB180505A |
| GCN_number |
22689 |
| Detection_method |
Fermi GBM Det |
| t_trigger |
12:57:09.910 UTC |
| ra |
4.5100° |
| decl |
-59.8900° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 22689
SUBJECT: GRB 180505A: Fermi GBM detection
DATE: 18/05/05 19:33:04 GMT
FROM: Christian Malacaria at U of Alabama/MSFC
C. Malacaria (NASA-MFSC/USRA) and E. Bissaldi (Politecnico & INFN Bari)
report on behalf of the Fermi GBM Team:
"At 12:57:09.91 UT on 5 May 2018, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 180505A (trigger 547217834 / 180505540).
The on-ground calculated location, using the GBM trigger data, is
RA = 4.51, Dec = -59.89
(J2000 degrees), with an uncertainty of 1.2 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 124 degrees.
The GBM light curve shows multiple peaks
with a duration (T90) of about 22 s (50-300 keV).
The time-averaged spectrum from T0-3.5 s to T0+31 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.38 +/- 0.03 and
the cutoff energy, parameterized as Epeak, is 235 +/- 19 keV
The event fluence (10-1000 keV) in this time interval is
(2.38 +/- 0.07)E-05 erg/cm^2. The 1-s peak photon flux measured
starting from T0+20.99 s in the 10-1000 keV band
is 29.2 +/- 0.8 ph/s/cm^2.
A Band function fits the spectrum equally well
with Epeak= 233 +/- 25 keV, alpha = -1.38 +/- 0.04 and beta = -3.09 +/- 1.32.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
|
| GCN 22734 table |
|---|
| GRB_name |
GRB180505A |
| GCN_number |
22734 |
| Detection_method |
AstroSat CZTI |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 22734
SUBJECT: GRB 180505A: AstroSat CZTI detection
DATE: 18/05/16 12:23:40 GMT
FROM: Vidushi Sharma at IUCAA
V. Sharma (IUCAA), V. Bhalerao (IIT-B), D. Bhattacharya (IUCAA), 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 180505A, which was also detected by Fermi-GBM (Malacaria E. et al, GCN # 22689).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 12:57:30.50 UT, ~11 s after GBM trigger. The measured peak count rate is 772.4 cts/s above the background in combined data of four quadrants, with a total of 3643 cts. The local mean background count rate was 697.6 cts/s. Using cumulative rates, we measure a T90 of 22.8 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.
|