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: Mon Nov 16 01:12:19 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger661775
======================================================================
Trigger: 00661775 Segment: 000
BAT Trigger Time: 467611119.488 [s; MET]
Trigger Stop: 467611120 [s; MET]
UTC: 2015-10-27T03:58:24.159080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.491599210451 Dec: 61.3808915516615 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.26
Image Trigger?: NO
Rate S/N Ratio: 29.1547594742265 [ if not an image trigger ]
Image S/N Ratio: 9.26
Analysis Position: [ source = BAT ]
RA: 272.491599210451 Dec: 61.3808915516615 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 272.497099805801 Dec: 61.361485467605 [deg; J2000]
{ 18h 09m 59.3s , +61d 21' 41.3" }
+/- 1.11530241647316 [arcmin] (estimated 90% radius based on SNR)
+/- 0.387175104164844 [arcmin] (formal 1-sigma fit error)
SNR: 26.026430195124
Angular difference between the analysis and refined position is 1.175054 arcmin
Partial Coding Fraction: 0.1894531 [ including projection effects ]
Duration
T90: 129.579999983311 +/- 5.46544933158177
Measured from: 0.65200001001358
to: 130.231999993324 [s; relative to TRIGTIME]
T50: 94.7759999036789 +/- 6.78514874748248
Measured from: 18.7880000472069
to: 113.563999950886 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.203999996185303
to: 1.2039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.739999949932098
to: 164.703999996185 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.220600 4.316379 3.316776 0.961016
0.099364 0.103021 0.090164 0.076072 [error]
Peak 0.161582 0.261932 0.284104 0.118131
0.017708 0.020564 0.020381 0.015645 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 165.444 -0.740 164.704
T90 129.580 0.652 130.232
T50 94.776 18.788 113.564
Peak 1.000 0.204 1.204
====== 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 -1.542 -0.056 0.056 - - - 4.71e-03 -1.36e-04 1.36e-04 45.940 57
CPL -1.550 -0.050 0.070 9999.360 -9999.360 -9999.360 4.68e-03 -8.76e-05 8.33e-04 46.380 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 -1.240 -0.134 0.136 - - - 5.80e-02 -4.53e-03 4.52e-03 49.730 57
CPL -1.235 -0.135 0.520 9984.670 -9984.670 -9984.670 5.83e-02 -4.50e-03 3.90e-02 49.730 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 1.03e-06 1.84e-06 2.53e-06 7.20e-06 7.29e-06 1.26e-05 erg/cm2
90%_error_low -5.94e-08 -6.16e-08 -9.18e-08 -5.85e-07 -2.22e-07 -6.36e-07 erg/cm2
90%_error_hi 6.07e-08 6.13e-08 9.16e-08 6.20e-07 2.22e-07 6.64e-07 erg/cm2
Peak flux PL 1.86e+00 2.19e+00 1.85e+00 2.66e+00 6.85e+00 8.56e+00 ph/cm2/s
90%_error_low -2.86e-01 -2.12e-01 -1.58e-01 -4.55e-01 -5.69e-01 -6.71e-01 ph/cm2/s
90%_error_hi 3.02e-01 2.10e-01 1.57e-01 5.08e-01 5.72e-01 6.74e-01 ph/cm2/s
Fluence CPL 9.51e-07 1.25e-06 1.25e-06 2.80e-06 4.23e-06 6.23e-06 erg/cm2
90%_error_low -7.76e-08 -9.57e-08 -1.00e-07 -3.22e-07 -3.47e-07 -4.59e-07 erg/cm2
90%_error_hi 5.78e-08 6.10e-08 1.19e-07 2.81e-07 3.36e-07 5.68e-07 erg/cm2
Peak flux CPL 1.86e+00 2.19e+00 1.85e+00 2.65e+00 6.85e+00 8.55e+00 ph/cm2/s
90%_error_low -2.91e-01 -1.99e-01 -1.44e-01 -1.01e+00 -5.69e-01 -1.20e+00 ph/cm2/s
90%_error_hi 3.24e-01 2.21e-01 2.02e-01 5.04e-01 5.71e-01 6.62e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 272.4971 61.3615 0.0074 51.7573 1.1621 3.1805032 26.026 TRIG_00661775 Foreground time interval of the image: -0.740 9.613 (delta_t = 10.353 [sec]) Background time interval of the image: -49.187 -0.740 (delta_t = 48.447 [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 -0.740000 38.175800 39.512000 164.704000 Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54232 ( -0.0559775 0.055888 ) Norm@50keV : 4.71213E-03 ( -0.000136436 0.000136414 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.94 using 59 PHA bins. # Reduced chi-squared = 0.8060 for 57 degrees of freedom # Null hypothesis probability = 8.526935e-01 Photon flux (15-150 keV) in 164.1 sec: 0.595227 ( -0.019189 0.019285 ) ph/cm2/s Energy fluence (15-150 keV) : 7.28868e-06 ( -2.22113e-07 2.22333e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum tstart tstop -0.740000 38.175800 39.512000 164.704000 Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54973 ( -0.0579607 0.0627077 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 4.67574E-03 ( -0.000134581 0.000785757 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.38 using 59 PHA bins. # Reduced chi-squared = 0.8281 for 56 degrees of freedom # Null hypothesis probability = 8.168565e-01 Photon flux (15-150 keV) in 164.1 sec: 0.598145 ( -0.013017 0.016252 ) ph/cm2/s Energy fluence (15-150 keV) : 4.22599e-06 ( -3.4655e-07 3.35524e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.204 sec. to 1.204 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23969 ( -0.134268 0.135699 ) Norm@50keV : 5.79965E-02 ( -0.0045266 0.00451536 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.73 using 59 PHA bins. # Reduced chi-squared = 0.8725 for 57 degrees of freedom # Null hypothesis probability = 7.418092e-01 Photon flux (15-150 keV) in 1 sec: 6.84818 ( -0.56932 0.57173 ) ph/cm2/s Energy fluence (15-150 keV) : 5.82076e-07 ( -4.74132e-08 4.75462e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.204 sec. to 1.204 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2353 ( -0.135116 0.520168 ) Epeak [keV] : 9984.67 ( -9986.85 -9986.85 ) Norm@50keV : 5.82622E-02 ( -0.00449964 0.0389517 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.73 using 59 PHA bins. # Reduced chi-squared = 0.8880 for 56 degrees of freedom # Null hypothesis probability = 7.096673e-01 Photon flux (15-150 keV) in 1 sec: 6.84698 ( -0.56925 0.57069 ) ph/cm2/s Energy fluence (15-150 keV) : 5.82023e-07 ( -4.8e-08 4.64983e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 129.58 sec. Hardness ratio (energy fluence ratio) = 1.3733458936
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.867038e-06 S(50-150 keV) = 4.421579e-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 = 1.268564196859785E+00, IMY = -2.573418711652416E-02
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: -49.187400 -0.740000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3415 35.4479 3.7 39.6 -35.2 -0.3641 -3.1 8.5 Her X-1 262.9962 -24.6885 5.0 43.7 -134.1 0.4081 2.3 3.5 GX 1+4 268.2548 -1.3884 5.8 23.9 -109.0 0.1625 2.0 7.8 SW J1753.5-0127 270.2744 -25.0837 17.7 40.3 -142.6 -0.0812 -0.7 0.6 GX 5-1 270.4943 -25.8776 0.0 40.9 -143.5 -0.0049 -0.0 13.1 GRS 1758-258 273.9912 -14.0208 4.3 29.0 -138.3 0.2302 2.7 1.3 GX 17+2 275.9317 -30.3696 31.4 43.2 -152.7 0.0478 0.4 0.4 H1820-303 285.1789 -24.9275 4.2 36.1 -163.4 -0.2450 -2.7 7.8 HT1900.1-2455 288.7921 10.9315 2.4 0.1 -177.7 0.3338 4.9 0.9 GRS 1915+105 299.5719 35.2082 1.2 26.1 31.3 0.7731 9.6 1.0 Cyg X-1 308.1380 40.9786 3.6 34.5 37.2 0.3557 3.2 2.0 Cyg X-3 326.3307 38.1917 8.2 43.1 55.5 -0.3674 -1.4 10.8 Cyg X-2 263.1099 -33.7940 4.4 51.0 -141.4 0.7461 2.7 6.5 GX 354-0 301.9395 -4.8673 2.5 20.6 150.8 0.3452 4.7 ------ UNKNOWN 300.0694 -9.8181 2.8 23.6 162.3 0.3003 4.1 ------ UNKNOWN 245.1298 39.0879 2.4 47.8 -35.3 0.8841 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.740000 9.612600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2684 35.4106 5.0 39.7 -35.3 0.1435 2.3 10.1 Her X-1 263.0466 -24.6320 6.5 43.6 -134.1 -0.1518 -1.8 7.1 GX 1+4 268.5484 -1.5587 0.0 23.7 -109.7 -0.0366 -0.8 12.6 SW J1753.5-0127 270.2119 -25.1149 4.9 40.4 -142.6 0.1496 2.3 4.5 GX 5-1 270.3658 -25.6038 5.6 40.8 -143.1 -0.1316 -2.1 9.0 GRS 1758-258 273.9917 -13.9087 6.5 28.9 -138.1 -0.0791 -1.8 7.7 GX 17+2 276.0017 -30.4482 5.8 43.2 -152.8 -0.1331 -2.0 6.3 H1820-303 285.1775 -24.9228 3.5 36.1 -163.4 0.1626 3.3 7.7 HT1900.1-2455 288.6643 10.8368 21.7 0.2 -133.1 0.0196 0.5 10.2 GRS 1915+105 299.6601 35.3518 5.7 26.3 31.4 0.0925 2.0 9.6 Cyg X-1 307.9554 40.8174 0.0 34.3 37.2 0.1019 1.7 10.7 Cyg X-3 326.0270 38.4788 10.1 43.1 54.9 0.1958 1.1 11.6 Cyg X-2 262.9094 -33.8041 1558.7 51.1 -141.2 -0.0011 -0.0 4.4 GX 354-0 326.3328 1.9703 2.6 38.3 111.9 0.4982 4.3 ------ UNKNOWN 318.2551 -8.4058 2.3 35.2 133.3 0.3382 5.1 ------ UNKNOWN 302.8753 -16.2016 2.2 30.6 163.6 0.2340 5.2 ------ UNKNOWN 272.4971 61.3615 0.4 51.8 1.2 3.1805 26.1 ------ UNKNOWN 292.5585 -19.9288 1.7 31.1 -175.9 0.2788 6.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 76.212600 962.585000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.1993 35.3347 0.0 28.5 -116.4 0.0893 0.1 12.7 Her X-1 288.8119 10.9613 3.9 51.8 -169.3 4.5080 3.0 1.2 GRS 1915+105 299.6011 35.2022 0.6 31.3 165.4 14.4894 19.7 0.5 Cyg X-1 308.0916 40.9335 1.1 29.6 148.4 7.1429 10.4 1.4 Cyg X-3 326.0018 38.2877 214.3 39.9 131.4 0.0749 0.1 8.3 Cyg X-2 272.5023 61.3606 0.7 0.0 153.9 8.6708 16.3 ------ UNKNOWN 192.6322 40.2710 5.3 50.8 -44.4 6.9970 2.2 ------ UNKNOWN 203.0466 39.0136 4.2 46.9 -53.9 7.9663 2.7 ------ UNKNOWN 212.7996 37.0801 4.9 43.7 -64.1 6.6347 2.4 ------ UNKNOWN 257.5032 14.6083 3.7 48.0 -129.1 8.2606 3.2 ------ UNKNOWN