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: Wed Aug 2 15:01:47 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger760064
======================================================================
Trigger: 00760064 Segment: 000
BAT Trigger Time: 520915566.4 [s; MET]
Trigger Stop: 520915567.424 [s; MET]
UTC: 2017-07-05T02:45:47.080260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 191.705000976796 Dec: 18.29305165087 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.55
Image Trigger?: NO
Rate S/N Ratio: 15.2315462117278 [ if not an image trigger ]
Image S/N Ratio: 8.55
Analysis Position: [ source = BAT ]
RA: 191.705000976796 Dec: 18.29305165087 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 191.708449416614 Dec: 18.2971908310857 [deg; J2000]
{ 12h 46m 50.0s , +18d 17' 49.9" }
+/- 0.659520317019392 [arcmin] (estimated 90% radius based on SNR)
+/- 0.23724287812918 [arcmin] (formal 1-sigma fit error)
SNR: 55.1269339758875
Angular difference between the analysis and refined position is 0.316654 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 223.203999936581 +/- 15.5520109197925
Measured from: 4.37200003862381
to: 227.575999975204 [s; relative to TRIGTIME]
T50: 90.5199999213219 +/- 55.6082785008254
Measured from: 12.2800000309944
to: 102.799999952316 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.4120000004768
to: 14.4120000004768 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.387999951839447
to: 310.464000046253 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.696455 5.691067 4.073681 1.036151
0.112395 0.118211 0.104684 0.092327 [error]
Peak 0.362903 0.615514 0.556924 0.132558
0.012749 0.015500 0.015156 0.010266 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 310.852 -0.388 310.464
T90 223.204 4.372 227.576
T50 90.520 12.280 102.800
Peak 1.000 13.412 14.412
====== 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 -1.629 -0.054 0.054 - - - 3.19e-03 -8.63e-05 8.62e-05 60.340 57
CPL -1.608 -0.072 0.130 996.671 -996.661 -996.671 3.26e-03 -1.53e-04 4.31e-04 60.620 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.292 -0.053 0.053 - - - 1.16e-01 -3.46e-03 3.46e-03 47.200 57
CPL -0.917 -0.216 0.227 161.283 -40.411 135.388 1.72e-01 -3.42e-02 4.50e-02 38.170 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 1.42e-06 2.42e-06 3.13e-06 8.17e-06 9.22e-06 1.52e-05 erg/cm2
90%_error_low -7.63e-08 -7.34e-08 -1.11e-07 -6.52e-07 -2.62e-07 -7.15e-07 erg/cm2
90%_error_hi 7.80e-08 7.32e-08 1.11e-07 6.92e-07 2.63e-07 7.46e-07 erg/cm2
Peak flux PL 8.02e-04 9.49e-03 1.54e-01 1.35e+01 4.39e-01 1.35e+01 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 1.43e-06 2.41e-06 3.12e-06 8.15e-06 9.28e-06 1.59e-05 erg/cm2
90%_error_low N/A N/A -9.79e-08 N/A -1.93e-07 -2.41e-06 erg/cm2
90%_error_hi N/A N/A 1.24e-07 N/A 1.99e-07 -4.04e-07 erg/cm2
Peak flux CPL 3.56e+00 4.55e+00 3.79e+00 3.45e+00 1.36e+01 1.54e+01 ph/cm2/s
90%_error_low -2.93e-01 -1.71e-01 -1.53e-01 -6.26e-01 -4.58e-01 -8.05e-01 ph/cm2/s
90%_error_hi 3.00e-01 1.72e-01 1.55e-01 7.98e-01 4.59e-01 9.29e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 191.7084 18.2972 0.0035 27.6461 -153.2645 3.5017277 55.127 TRIG_00760064 Foreground time interval of the image: -0.388 2.729 (delta_t = 3.117 [sec]) 3.600 11.901 (delta_t = 8.301 [sec]) Background time interval of the image: -573.299 -558.717 (delta_t = 14.582 [sec]) -239.400 -0.388 (delta_t = 239.012 [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
Multiple GTIs in the spectrum tstart tstop -0.388000 2.728800 3.600000 310.464000 Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62864 ( -0.0541709 0.0540294 ) Norm@50keV : 3.19001E-03 ( -8.62583e-05 8.61768e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.34 using 59 PHA bins. # Reduced chi-squared = 1.059 for 57 degrees of freedom # Null hypothesis probability = 3.558693e-01 Photon flux (15-150 keV) in 310 sec: 0.413666 ( -0.012391 0.012439 ) ph/cm2/s Energy fluence (15-150 keV) : 9.21915e-06 ( -2.6217e-07 2.62668e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum tstart tstop -0.388000 2.728800 3.600000 310.464000 Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.6267 ( -0.0719356 0.129511 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 3.19705E-03 ( -8.66233e-05 0.000496574 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.37 using 59 PHA bins. # Reduced chi-squared = 1.078 for 56 degrees of freedom # Null hypothesis probability = 3.209149e-01 Photon flux (15-150 keV) in 310 sec: 0.416287 ( -0.014745 0.00977 ) ph/cm2/s Energy fluence (15-150 keV) : 9.27622e-06 ( -1.93382e-07 1.98613e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 13.412 sec. to 14.412 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29248 ( -0.053072 0.0530887 ) Norm@50keV : 0.116061 ( -0.00346143 0.00346141 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.20 using 59 PHA bins. # Reduced chi-squared = 0.8281 for 57 degrees of freedom # Null hypothesis probability = 8.192800e-01 Photon flux (15-150 keV) in 1 sec: 0.439072 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.14916e-06 ( -3.72747e-08 3.73188e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.412 sec. to 14.412 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.917261 ( -0.216402 0.227248 ) Epeak [keV] : 161.283 ( -40.4108 135.387 ) Norm@50keV : 0.172109 ( -0.0341799 0.0449787 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.17 using 59 PHA bins. # Reduced chi-squared = 0.6815 for 56 degrees of freedom # Null hypothesis probability = 9.672778e-01 Photon flux (15-150 keV) in 1 sec: 13.5576 ( -0.4581 0.4589 ) ph/cm2/s Energy fluence (15-150 keV) : 1.12694e-06 ( -3.98888e-08 3.97622e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 223.204 sec. Hardness ratio (energy fluence ratio) = 1.29359971314
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.845595e-06 S(50-150 keV) = 5.373505e-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
IMX = -4.678128887453081E-01, IMY = 2.356490593944571E-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: -573.299410 -558.717300 -239.400000 -0.388000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3725 35.3059 4.0 29.9 31.7 0.8338 2.9 4.7 Her X-1 290.6135 46.8464 3.7 55.8 10.6 4.2911 3.2 ------ UNKNOWN 272.3863 51.0986 2.7 43.7 6.0 1.7228 4.2 ------ UNKNOWN 248.4076 50.7397 2.2 29.2 -1.1 1.3566 5.3 ------ UNKNOWN 227.6955 43.7738 2.2 14.2 -13.6 1.1573 5.2 ------ UNKNOWN 175.8572 -0.1286 2.5 51.3 -160.8 2.9263 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.388000 2.728800 3.600000 11.900590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6794 35.2966 0.0 30.2 31.7 -0.1467 -1.8 11.2 Her X-1 240.1637 19.5068 2.4 22.8 75.4 0.3330 4.7 ------ UNKNOWN 191.7084 18.2972 0.2 27.6 -153.3 3.5019 55.1 ------ UNKNOWN 185.5470 77.6668 2.3 48.5 -50.2 1.2935 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 61.300620 837.757800 840.600000 962.630900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 209.2576 -6.0998 2.5 29.9 122.3 5.0234 4.6 ------ UNKNOWN 242.0803 54.4402 3.3 52.6 13.5 8.8532 3.5 ------ UNKNOWN 245.9800 57.8175 3.4 55.9 10.7 12.8652 3.4 ------ UNKNOWN 191.7677 18.2917 1.7 0.1 95.2 4.4196 6.7 ------ UNKNOWN 163.7670 -2.2846 3.2 34.4 -144.8 3.2391 3.6 ------ UNKNOWN 180.5727 67.6817 3.1 49.9 -26.3 5.9703 3.7 ------ UNKNOWN 147.8775 21.7289 5.0 41.2 -98.5 7.7902 2.4 ------ UNKNOWN 147.0422 5.6049 3.2 45.4 -121.3 11.4455 3.7 ------ UNKNOWN 150.5345 52.6776 3.9 46.9 -54.0 10.6829 3.0 ------ UNKNOWN 150.4767 53.4697 2.9 47.4 -53.1 15.5017 4.0 ------ UNKNOWN