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: Mon Jul 10 17:01:54 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB170710B
======================================================================
Trigger: 00086619 Segment: 001
BAT Trigger Time: 521367025.6
UTC: 20170710T08:10:06.251 [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: 43.12361967 Dec: 42.68415110 [deg; J2000]
Refined Position: [ source = BAT mosaic image ]
RA: 43.1220545845827 Dec: 42.6787730091842 [deg; J2000]
{ 02h 52m 29.3s , +42d 40' 43.6" }
+/- 0.810837503439 [arcmin] (estimated 90% radius based on SNR)
SNR: 41.0458949592
Angular difference between the analysis and refined position is 0.329987 arcmin
Partial Coding Fraction: Unavailable because the burst occurred during slew.
Duration
T90: 54.4000000357628 +/- 1.6
Measured from: 1.6
to: 56 [s; relative to TRIGTIME]
T50: 30.4000000357628 +/- 1.6
Measured from: 12.8
to: 43.2 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 59.200 0.000 59.200
T90 54.400 1.600 56.000
T50 30.400 12.800 43.200
Peak 1.000 5.100 6.100
====== 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: PL)
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 -1.377 -0.077 0.077 - - - 4.14e-03 -1.71e-04 1.71e-04 50.650 57
CPL -1.276 -0.150 0.269 356.927 -356.927 -356.927 4.62e-03 -6.20e-04 1.41e-03 50.810 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
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 -0.941 -0.223 0.233 - - - 1.01e-02 -1.45e-03 1.44e-03 49.550 57
CPL 0.632 -1.100 1.488 99.897 -22.806 89.152 4.62e-02 -4.62e-02 1.28e-01 42.940 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 2.79e-07 5.53e-07 8.51e-07 2.87e-06 2.38e-06 4.55e-06 erg/cm2
90%_error_low -2.23e-08 -2.61e-08 -4.36e-08 -3.21e-07 -1.07e-07 -3.49e-07 erg/cm2
90%_error_hi 2.29e-08 2.59e-08 4.34e-08 3.49e-07 1.07e-07 3.71e-07 erg/cm2
Peak flux PL 2.43e-01 3.42e-01 3.56e-01 6.82e-01 1.16e+00 1.62e+00 ph/cm2/s
90%_error_low -6.61e-02 -6.19e-02 -5.16e-02 -1.84e-01 -1.67e-01 -2.39e-01 ph/cm2/s
90%_error_hi 7.35e-02 6.14e-02 5.13e-02 2.23e-01 1.68e-01 2.47e-01 ph/cm2/s
Fluence CPL 2.76e-07 5.55e-07 8.55e-07 2.65e-06 2.37e-06 4.34e-06 erg/cm2
90%_error_low -2.79e-08 -2.64e-08 -4.45e-08 -9.02e-07 -1.17e-07 -9.01e-07 erg/cm2
90%_error_hi 2.22e-08 2.89e-08 4.85e-08 3.00e-07 1.09e-07 3.29e-07 erg/cm2
Peak flux CPL 1.52e-01 3.55e-01 4.22e-01 2.37e-01 1.09e+00 1.17e+00 ph/cm2/s
90%_error_low -7.45e-02 -7.59e-02 -6.87e-02 N/A -1.73e-01 -2.14e-01 ph/cm2/s
90%_error_hi 8.99e-02 7.41e-02 7.08e-02 N/A 1.74e-01 2.76e-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 43.122 42.679 0.002 32.546 154.957 0.074 41.046 UNKNOWN Image time interval: 1.196 to 40.840 [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 59.200 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37701 ( -0.0765902 0.0767227 ) Norm@50keV : 4.14018E-03 ( -0.00017057 0.000170543 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.65 using 59 PHA bins. # Reduced chi-squared = 0.8885 for 57 degrees of freedom # Null hypothesis probability = 7.107980e-01 Photon flux (15-150 keV) in 59.2 sec: 0.501637 ( -0.021906 0.021975 ) ph/cm2/s Energy fluence (15-150 keV) : 2.37997e-06 ( -1.06906e-07 1.07293e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 59.200 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2759 ( -0.104592 0.314306 ) Epeak [keV] : 356.927 ( -668.612 -668.612 ) Norm@50keV : 4.61772E-03 ( -0.000389556 0.00163962 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.81 using 59 PHA bins. # Reduced chi-squared = 0.9073 for 56 degrees of freedom # Null hypothesis probability = 6.710683e-01 Photon flux (15-150 keV) in 59.2 sec: 0.500042 ( -0.023459 0.022349 ) ph/cm2/s Energy fluence (15-150 keV) : 2.37127e-06 ( -1.1713e-07 1.0884e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.100 sec. to 6.100 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.941008 ( -0.223252 0.233326 ) Norm@50keV : 1.00626E-02 ( -0.0014515 0.00144065 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.55 using 59 PHA bins. # Reduced chi-squared = 0.8693 for 57 degrees of freedom # Null hypothesis probability = 7.478667e-01 Photon flux (15-150 keV) in 1 sec: 1.15578 ( -0.167446 0.16834 ) ph/cm2/s Energy fluence (15-150 keV) : 1.11191e-07 ( -1.62093e-08 1.62825e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.100 sec. to 6.100 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.631674 ( -1.10072 1.48683 ) Epeak [keV] : 99.8967 ( -22.7914 89.1667 ) Norm@50keV : 4.62324E-02 ( -0.0462614 0.127498 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.94 using 59 PHA bins. # Reduced chi-squared = 0.7668 for 56 degrees of freedom # Null hypothesis probability = 8.999597e-01 Photon flux (15-150 keV) in 1 sec: 1.08950 ( -0.173046 0.17446 ) ph/cm2/s Energy fluence (15-150 keV) : 1.05167e-07 ( -1.72951e-08 1.72749e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 54.4 sec. Hardness ratio (energy fluence ratio) = 1.54006794619
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.315351e-07 S(50-150 keV) = 1.5484625e-06
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
