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: Fri Oct 20 14:31:52 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger775553
======================================================================
Trigger: 00775553 Segment: 000
BAT Trigger Time: 528575160 [s; MET]
Trigger Stop: 528575248 [s; MET]
UTC: 2017-10-01T18:25:40.226640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 22.0881651678874 Dec: -11.8933202859369 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.92
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.92
Analysis Position: [ source = BAT ]
RA: 22.0881651678874 Dec: -11.8933202859369 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 22.0856134443431 Dec: -11.9254421918445 [deg; J2000]
{ 01h 28m 20.5s , -11d 55' 31.6" }
+/- 2.21229698656252 [arcmin] (estimated 90% radius based on SNR)
+/- 1.0381728184087 [arcmin] (formal 1-sigma fit error)
SNR: 9.78328965089821
Angular difference between the analysis and refined position is 1.933128 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 20.9159999489784 +/- 1.35107659821179
Measured from: 12.783999979496
to: 33.6999999284744 [s; relative to TRIGTIME]
T50: 14.8439999222755 +/- 2.28122767053415
Measured from: 16.6800000071526
to: 31.5239999294281 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 31.4160000085831
to: 32.4160000085831 [s; relative to TRIGTIME]
Total Fluence
Measured from: 12.027999997139
to: 34.1959999799728 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.249561 0.292991 0.284680 0.098345
0.032751 0.034290 0.030186 0.027001 [error]
Peak 0.036464 0.041516 0.032255 0.002187
0.007264 0.007875 0.006869 0.005892 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 22.168 12.028 34.196
T90 20.916 12.784 33.700
T50 14.844 16.680 31.524
Peak 1.000 31.416 32.416
====== 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 -1.444 -0.203 0.201 - - - 2.69e-03 -3.06e-04 3.03e-04 69.420 57
CPL -1.303 N/A N/A 253.945 N/A N/A 3.16e-03 N/A N/A 69.330 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 -1.660 -0.353 0.331 - - - 7.23e-03 -1.59e-03 1.54e-03 54.570 57
CPL -1.169 -1.113 1.517 77.620 -37.026 -77.620 1.34e-02 -1.34e-02 7.48e-02 54.100 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 7.22e-08 1.37e-07 2.02e-07 6.36e-07 5.71e-07 1.05e-06 erg/cm2
90%_error_low -1.36e-08 -1.60e-08 -3.03e-08 -1.85e-07 -7.24e-08 -2.12e-07 erg/cm2
90%_error_hi 1.44e-08 1.58e-08 3.01e-08 2.32e-07 7.33e-08 2.50e-07 erg/cm2
Peak flux PL 3.47e-01 3.18e-01 2.01e-01 1.95e-01 9.47e-01 1.06e+00 ph/cm2/s
90%_error_low -9.71e-02 -6.05e-02 -5.67e-02 -9.02e-02 -1.79e-01 -2.08e-01 ph/cm2/s
90%_error_hi 1.03e-01 6.04e-02 5.68e-02 1.27e-01 1.79e-01 2.11e-01 ph/cm2/s
Fluence CPL 7.04e-08 1.39e-07 2.04e-07 5.11e-07 5.65e-07 9.25e-07 erg/cm2
90%_error_low -1.71e-08 -1.75e-08 -2.88e-08 -3.45e-07 -8.08e-08 -3.56e-07 erg/cm2
90%_error_hi 1.37e-08 1.96e-08 3.30e-08 1.68e-07 7.79e-08 1.87e-07 erg/cm2
Peak flux CPL 3.26e-01 3.36e-01 2.05e-01 1.06e-01 9.30e-01 9.73e-01 ph/cm2/s
90%_error_low -1.13e-01 -6.96e-02 -6.15e-02 -1.06e-01 -1.84e-01 -2.13e-01 ph/cm2/s
90%_error_hi 1.15e-01 7.88e-02 6.27e-02 1.22e-01 1.84e-01 2.40e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 22.0856 -11.9254 0.0197 20.8363 53.0294 0.8679399 9.783 TRIG_00775553 Foreground time interval of the image: 12.028 34.196 (delta_t = 22.168 [sec]) Background time interval of the image: -13.099 12.028 (delta_t = 25.127 [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 12.028 sec. to 34.196 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.44356 ( -0.20292 0.200632 ) Norm@50keV : 2.68908E-03 ( -0.000305544 0.000303363 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.42 using 59 PHA bins. # Reduced chi-squared = 1.218 for 57 degrees of freedom # Null hypothesis probability = 1.251110e-01 Photon flux (15-150 keV) in 22.17 sec: 0.330873 ( -0.03696 0.03703 ) ph/cm2/s Energy fluence (15-150 keV) : 5.7125e-07 ( -7.23704e-08 7.32987e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.028 sec. to 34.196 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.30323 ( ) Epeak [keV] : 253.945 ( ) Norm@50keV : 3.15706E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.33 using 59 PHA bins. # Reduced chi-squared = 1.238 for 56 degrees of freedom # Null hypothesis probability = 1.086373e-01 Photon flux (15-150 keV) in 22.17 sec: 0.328567 ( -0.039362 0.038652 ) ph/cm2/s Energy fluence (15-150 keV) : 5.65062e-07 ( -8.07833e-08 7.78706e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 31.416 sec. to 32.416 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65999 ( -0.353295 0.330967 ) Norm@50keV : 7.22888E-03 ( -0.00158985 0.00153741 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.57 using 59 PHA bins. # Reduced chi-squared = 0.9574 for 57 degrees of freedom # Null hypothesis probability = 5.667224e-01 Photon flux (15-150 keV) in 1 sec: 0.947083 ( -0.179113 0.179137 ) ph/cm2/s Energy fluence (15-150 keV) : 6.71754e-08 ( -1.5342e-08 1.58536e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.416 sec. to 32.416 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16929 ( -1.11304 1.51679 ) Epeak [keV] : 77.6203 ( -37.0242 -77.6184 ) Norm@50keV : 1.33710E-02 ( -0.0133713 0.0748494 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.10 using 59 PHA bins. # Reduced chi-squared = 0.9661 for 56 degrees of freedom # Null hypothesis probability = 5.471054e-01 Photon flux (15-150 keV) in 1 sec: 0.930393 ( -0.183583 0.183637 ) ph/cm2/s Energy fluence (15-150 keV) : 6.42407e-08 ( -1.63887e-08 1.72992e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 20.916 sec. Hardness ratio (energy fluence ratio) = 1.47065235436
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.0953948e-07 S(50-150 keV) = 3.617038e-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 = 2.288884879572669E-01, IMY = -3.040696127955854E-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: -13.099400 12.028000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] [']
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 12.028000 34.196000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 22.0856 -11.9254 1.2 20.8 53.0 0.8678 9.8 ------ UNKNOWN 351.9142 52.8389 2.2 56.9 176.6 2.5095 5.3 ------ UNKNOWN 50.1920 40.4765 2.5 37.8 -133.0 0.5349 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 175.300590 963.090000 1503.000000 1503.200600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 2.1113 22.8774 2.3 39.9 103.9 10.8400 5.1 ------ UNKNOWN 23.2210 15.4319 2.1 27.3 135.7 4.0826 5.6 ------ UNKNOWN 334.7687 -33.0711 3.5 48.0 9.2 3.4101 3.3 ------ UNKNOWN 326.9806 -44.0337 4.2 56.9 -2.0 6.9574 2.8 ------ UNKNOWN 339.2112 -44.8871 2.6 49.2 -7.2 4.9064 4.5 ------ UNKNOWN 64.7543 5.1296 2.5 45.7 -156.1 4.6662 4.6 ------ UNKNOWN 70.6902 4.2278 2.7 51.0 -152.2 6.4170 4.3 ------ UNKNOWN