Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
==========================================================================
BAT GROUND-DETECTED GRB DATA PROCESSING REPORT
(This burst occurred during telescope slew)
Process Script Ver: batgrbproduct v2.46
Process Start Time: Thu May 25 09:50:58 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB170524B
======================================================================
Trigger: 00753445 Segment: 006
BAT Trigger Time: 517315259.2
UTC: 2017-05-24T10:40:59.20 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst during slew is the T100 start time.
Analysis Position: [ source = GCN ]
RA: 90.8641 Dec: -17.0864 [deg; J2000]
Refined Position: [ source = BAT mosaic image ]
RA: 90.8655956209218 Dec: -17.080680000449 [deg; J2000]
{ 06h 03m 27.7s , -17d -4' -50.4" }
+/- 0.664203320764 [arcmin] (estimated 90% radius based on SNR)
SNR: 54.5796631666
Angular difference between the analysis and refined position is 0.353757 arcmin
Partial Coding Fraction: Unavailable because the burst occurred during slew.
Duration
T90: 46.4000000357628 +/- 1.6
Measured from: 0
to: 46.4 [s; relative to TRIGTIME]
T50: 27.2000000476837 +/- 1.6
Measured from: 4.8
to: 32 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 49.600 0.000 49.600
T90 46.400 0.000 46.400
T50 27.200 4.800 32.000
Peak 1.000 6.700 7.700
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.153 -0.058 0.058 - - - 1.30e-02 -4.22e-04 4.20e-04 73.500 57
CPL -0.938 -0.117 0.240 296.093 -124.113 -296.093 1.61e-02 -2.68e-03 4.09e-03 70.920 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.109 -0.075 0.076 - - - 7.01e-02 -2.86e-03 2.86e-03 43.020 57
CPL -1.054 -0.183 0.216 986.608 -986.608 -986.608 7.42e-02 -6.59e-03 1.65e-02 43.240 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 5.96e-07 1.36e-06 2.44e-06 1.04e-05 6.65e-06 1.48e-05 erg/cm2
90%_error_low -4.10e-08 -5.57e-08 -8.32e-08 -8.15e-07 -2.16e-07 -8.47e-07 erg/cm2
90%_error_hi 4.22e-08 5.54e-08 8.30e-08 8.65e-07 2.16e-07 8.88e-07 erg/cm2
Peak flux PL 6.61e-04 6.88e-03 7.57e-02 8.02e+00 3.38e-01 7.95e+00 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 3.48e-07 4.66e-07 4.81e-07 1.14e-06 1.60e-06 2.46e-06 erg/cm2
90%_error_low -2.56e-08 -7.75e-08 -5.53e-08 -6.45e-08 -2.12e-07 -2.10e-07 erg/cm2
90%_error_hi 6.19e-08 6.79e-08 4.67e-08 5.54e-08 1.78e-07 1.32e-07 erg/cm2
Peak flux CPL 1.99e+00 2.52e+00 2.33e+00 3.89e+00 8.15e+00 1.08e+01 ph/cm2/s
90%_error_low N/A -1.28e-01 -1.11e-01 -1.04e+00 -3.86e-01 -1.31e+00 ph/cm2/s
90%_error_hi N/A 1.23e-01 7.50e-02 -6.27e-02 3.62e-01 4.12e-01 ph/cm2/s
======================================================================
Image
Note1: The mosaic image is made with timebin = 0.2 s; energybin = 15-350 keV
Note2: The mosaic image uses Galactic coordinate.
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 90.866 -17.081 0.001 38.131 25.491 0.183 54.580 UNKNOWN Image time interval: 0.000 to 49.600 [sec]
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Best duration plot
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from 0.000 sec. to 49.600 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15258 ( -0.057826 0.0583438 ) Norm@50keV : 1.30277E-02 ( -0.00042157 0.000420102 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.50 using 59 PHA bins. # Reduced chi-squared = 1.290 for 57 degrees of freedom # Null hypothesis probability = 6.962159e-02 Photon flux (15-150 keV) in 49.6 sec: 1.51976 ( -0.05272 0.05289 ) ph/cm2/s Energy fluence (15-150 keV) : 6.64754e-06 ( -2.15605e-07 2.15739e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 49.600 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.938243 ( -0.117294 0.239784 ) Epeak [keV] : 296.093 ( -124.113 -296.093 ) Norm@50keV : 1.60598E-02 ( -0.00268093 0.00408664 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.92 using 59 PHA bins. # Reduced chi-squared = 1.266 for 56 degrees of freedom # Null hypothesis probability = 8.642971e-02 Photon flux (15-150 keV) in 49.6 sec: 1.50003 ( -0.05638 0.05667 ) ph/cm2/s Energy fluence (15-150 keV) : 1.60145e-06 ( -2.11999e-07 1.78193e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.700 sec. to 7.700 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.10902 ( -0.0754327 0.0757581 ) Norm@50keV : 7.01237E-02 ( -0.00286143 0.00285995 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.02 using 59 PHA bins. # Reduced chi-squared = 0.7547 for 57 degrees of freedom # Null hypothesis probability = 9.148265e-01 Photon flux (15-150 keV) in 1 sec: 0.337600 ( ) ph/cm2/s Energy fluence (15-150 keV) : 7.31139e-07 ( -3.32441e-08 3.33654e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.700 sec. to 7.700 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.10389 ( -0.18335 0.216179 ) Epeak [keV] : 9998.77 ( -9998.81 -9998.81 ) Norm@50keV : 7.04974E-02 ( -0.00286667 0.0202752 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.03 using 59 PHA bins. # Reduced chi-squared = 0.7684 for 56 degrees of freedom # Null hypothesis probability = 8.981342e-01 Photon flux (15-150 keV) in 1 sec: 8.15296 ( -0.38597 0.36165 ) ph/cm2/s Energy fluence (15-150 keV) : 1.61035e-07 ( -2.48215e-08 1.92792e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
Mask shadow pattern unavailable because this burst occurs during telescope slews.Spacecraft aspect plot
