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 GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Sat Jan 20 04:29:50 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger802999
======================================================================
Trigger: 00802999 Segment: 000
BAT Trigger Time: 536601004.544 [s; MET]
Trigger Stop: 536601005.568 [s; MET]
UTC: 2018-01-02T15:49:44.290400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 203.115129995838 Dec: 62.1481848328947 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.37
Image Trigger?: NO
Rate S/N Ratio: 11.8321595661992 [ if not an image trigger ]
Image S/N Ratio: 7.37
Analysis Position: [ source = BAT ]
RA: 203.115129995838 Dec: 62.1481848328947 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 203.072733292129 Dec: 62.1649485998259 [deg; J2000]
{ 13h 32m 17.5s , +62d 09' 53.8" }
+/- 1.4239082216829 [arcmin] (estimated 90% radius based on SNR)
+/- 0.73411187751022 [arcmin] (formal 1-sigma fit error)
SNR: 18.3593957443108
Angular difference between the analysis and refined position is 1.556685 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 11.5599999427795 +/- 1.73180249679767
Measured from: -6.14000004529953
to: 5.41999989748001 [s; relative to TRIGTIME]
T50: 3.91199994087219 +/- 1.9909956942061
Measured from: -0.760000050067902
to: 3.15199989080429 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.799999952316284
to: 1.79999995231628 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.6240000128746
to: 6.29999995231628 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.263254 0.264324 0.124075 0.037290
0.020722 0.021600 0.018211 0.014879 [error]
Peak 0.029316 0.045216 0.040163 0.010334
0.005642 0.006081 0.005437 0.004248 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 13.924 -7.624 6.300
T90 11.560 -6.140 5.420
T50 3.912 -0.760 3.152
Peak 1.000 0.800 1.800
====== 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 -2.025 -0.192 0.182 - - - 2.71e-03 -3.34e-04 3.26e-04 48.630 57
CPL -1.996 -0.021 0.736 4.565 -3.902 -4.565 2.83e-03 -1.45e-03 5.37e-04 48.630 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 -1.521 -0.253 0.244 - - - 7.85e-03 -1.19e-03 1.17e-03 52.240 57
CPL -0.813 -0.885 1.368 83.214 -27.975 -83.214 1.80e-02 -1.10e-02 6.60e-02 51.000 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 7.90e-08 1.06e-07 1.04e-07 1.83e-07 3.48e-07 4.72e-07 erg/cm2
90%_error_low -1.05e-08 -9.91e-09 -1.75e-08 -5.50e-08 -3.94e-08 -7.56e-08 erg/cm2
90%_error_hi 1.08e-08 9.89e-09 1.79e-08 6.91e-08 4.02e-08 8.65e-08 erg/cm2
Peak flux PL 3.30e-01 3.28e-01 2.28e-01 2.52e-01 9.86e-01 1.14e+00 ph/cm2/s
90%_error_low -7.42e-02 -4.83e-02 -4.43e-02 -8.62e-02 -1.40e-01 -1.66e-01 ph/cm2/s
90%_error_hi 7.86e-02 4.79e-02 4.38e-02 1.09e-01 1.40e-01 1.69e-01 ph/cm2/s
Fluence CPL 7.81e-08 1.06e-07 1.06e-07 1.81e-07 3.47e-07 4.58e-07 erg/cm2
90%_error_low -8.57e-09 -9.70e-09 -9.77e-09 N/A -4.30e-08 N/A erg/cm2
90%_error_hi 7.19e-09 9.90e-09 1.62e-08 N/A 4.25e-08 N/A erg/cm2
Peak flux CPL 2.91e-01 3.50e-01 2.41e-01 1.21e-01 9.58e-01 1.00e+00 ph/cm2/s
90%_error_low -9.66e-02 -5.88e-02 -4.97e-02 -1.21e-01 -1.49e-01 -1.78e-01 ph/cm2/s
90%_error_hi 9.65e-02 6.15e-02 5.18e-02 1.64e-01 1.47e-01 2.33e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 203.0727 62.1649 0.0105 18.9583 -34.2114 0.7200210 18.359 TRIG_00802999 Foreground time interval of the image: -7.624 6.300 (delta_t = 13.924 [sec]) Background time interval of the image: -110.043 -7.624 (delta_t = 102.419 [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.
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 -7.624 sec. to 6.300 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.02506 ( -0.191832 0.182099 ) Norm@50keV : 2.70961E-03 ( -0.000334193 0.000325788 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.63 using 59 PHA bins. # Reduced chi-squared = 0.8532 for 57 degrees of freedom # Null hypothesis probability = 7.771831e-01 Photon flux (15-150 keV) in 13.92 sec: 0.411228 ( -0.038234 0.038247 ) ph/cm2/s Energy fluence (15-150 keV) : 3.48401e-07 ( -3.93506e-08 4.02138e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.624 sec. to 6.300 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.99643 ( -0.0207833 0.736349 ) Epeak [keV] : 4.56510 ( -3.91837 -4.58097 ) Norm@50keV : 2.82571E-03 ( -0.00144537 0.000537473 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.63 using 59 PHA bins. # Reduced chi-squared = 0.8684 for 56 degrees of freedom # Null hypothesis probability = 7.472946e-01 Photon flux (15-150 keV) in 13.92 sec: 0.410879 ( -0.038083 0.039528 ) ph/cm2/s Energy fluence (15-150 keV) : 3.47279e-07 ( -4.29948e-08 4.24918e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.800 sec. to 1.800 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52103 ( -0.252703 0.24401 ) Norm@50keV : 7.85258E-03 ( -0.00119235 0.00117432 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.24 using 59 PHA bins. # Reduced chi-squared = 0.9164 for 57 degrees of freedom # Null hypothesis probability = 6.540353e-01 Photon flux (15-150 keV) in 1 sec: 0.985985 ( -0.140313 0.140395 ) ph/cm2/s Energy fluence (15-150 keV) : 7.4254e-08 ( -1.23042e-08 1.25161e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.800 sec. to 1.800 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.812526 ( -0.886143 1.36643 ) Epeak [keV] : 83.2136 ( -27.9261 -83.1649 ) Norm@50keV : 1.80085E-02 ( -0.0110458 0.0660071 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.00 using 59 PHA bins. # Reduced chi-squared = 0.9107 for 56 degrees of freedom # Null hypothesis probability = 6.641112e-01 Photon flux (15-150 keV) in 1 sec: 0.958220 ( -0.148557 0.14708 ) ph/cm2/s Energy fluence (15-150 keV) : 7.06822e-08 ( -1.31753e-08 1.36241e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 11.56 sec. Hardness ratio (energy fluence ratio) = 0.982811077096
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.8467822e-07 S(50-150 keV) = 1.6372096e-07
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
IMX = 2.840744469097226E-01, IMY = 1.931394477765271E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -110.043410 -7.624000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 108.6720 43.7855 2.4 40.4 95.4 2.2722 4.8 ------ UNKNOWN 178.9957 21.4178 2.5 55.9 11.0 2.8836 4.5 ------ UNKNOWN 40.9138 61.4276 0.4 37.5 165.5 5.4119 31.8 ------ UNKNOWN 22.1058 60.2250 2.6 41.0 179.1 0.8581 4.4 ------ UNKNOWN 188.7344 50.7580 2.9 27.6 -6.2 0.4859 4.0 ------ UNKNOWN 303.4946 54.9941 2.9 45.4 -121.4 2.1298 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -7.624000 6.300000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 203.0727 62.1650 0.6 19.0 -34.2 0.7200 18.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 53.756590 962.518300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 141.9733 53.7327 2.6 32.2 84.2 4.3054 4.5 ------ UNKNOWN 180.1553 25.3807 3.3 39.8 14.1 2.7561 3.5 ------ UNKNOWN 352.5341 58.6482 3.1 56.9 179.1 14.8431 3.7 ------ UNKNOWN