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: Sun Jul 31 21:16:34 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger704155
======================================================================
Trigger: 00704155 Segment: 000
BAT Trigger Time: 490046032.576 [s; MET]
Trigger Stop: 490046033.6 [s; MET]
UTC: 2016-07-12T19:53:36.025560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 304.149318030523 Dec: -26.9813085140697 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.67
Image Trigger?: NO
Rate S/N Ratio: 39.560080889705 [ if not an image trigger ]
Image S/N Ratio: 7.67
Analysis Position: [ source = BAT ]
RA: 304.149318030523 Dec: -26.9813085140697 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 304.164465787245 Dec: -26.9646060650258 [deg; J2000]
{ 20h 16m 39.5s , -26d 57' 52.6" }
+/- 1.31120927829803 [arcmin] (estimated 90% radius based on SNR)
+/- 0.578223719095616 [arcmin] (formal 1-sigma fit error)
SNR: 20.654538862418
Angular difference between the analysis and refined position is 1.288564 arcmin
Partial Coding Fraction: 0.2402344 [ including projection effects ]
Duration
T90: 44.527999997139 +/- 6.37316378425992
Measured from: -3.30399996042252
to: 41.2240000367165 [s; relative to TRIGTIME]
T50: 21.1200000047684 +/- 2.48082567258281
Measured from: 3.67200005054474
to: 24.7920000553131 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0600000023841858
to: 1.06000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.59999996423721
to: 45.4640000462532 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.819694 1.252365 1.192259 0.502909
0.084043 0.088490 0.079544 0.066521 [error]
Peak 0.043115 0.089871 0.134019 0.063842
0.012824 0.014836 0.015719 0.013224 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 54.064 -8.600 45.464
T90 44.528 -3.304 41.224
T50 21.120 3.672 24.792
Peak 1.000 0.060 1.060
====== 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 -1.172 -0.127 0.129 - - - 4.72e-03 -3.29e-04 3.28e-04 62.960 57
CPL -1.121 -0.184 0.261 971.969 -971.969 -971.969 4.98e-03 -5.63e-04 1.24e-03 63.380 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 -0.766 -0.262 0.279 - - - 2.02e-02 -3.19e-03 3.12e-03 46.730 57
CPL -0.739 -0.285 1.162 9723.560 -9723.560 -9723.560 2.05e-02 -3.36e-03 2.78e-03 46.760 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 2.40e-07 5.39e-07 9.56e-07 3.99e-06 2.61e-06 5.72e-06 erg/cm2
90%_error_low -3.42e-08 -4.63e-08 -7.56e-08 -6.92e-07 -1.93e-07 -7.34e-07 erg/cm2
90%_error_hi 3.59e-08 4.56e-08 7.51e-08 7.92e-07 1.93e-07 8.17e-07 erg/cm2
Peak flux PL 4.13e-01 6.46e-01 7.60e-01 1.73e+00 2.32e+00 3.55e+00 ph/cm2/s
90%_error_low -1.32e-01 -1.35e-01 -1.14e-01 -5.19e-01 -3.51e-01 -5.87e-01 ph/cm2/s
90%_error_hi 1.50e-01 1.32e-01 1.13e-01 6.55e-01 3.52e-01 6.38e-01 ph/cm2/s
Fluence CPL 2.39e-07 5.36e-07 9.46e-07 4.01e-06 2.62e-06 5.44e-06 erg/cm2
90%_error_low N/A -4.34e-08 -9.41e-08 -1.37e-06 -2.69e-07 -1.09e-06 erg/cm2
90%_error_hi N/A 4.85e-08 1.15e-07 3.28e-07 2.56e-07 1.08e-06 erg/cm2
Peak flux CPL 4.11e-01 6.46e-01 7.61e-01 1.70e+00 2.32e+00 3.53e+00 ph/cm2/s
90%_error_low -1.82e-01 -1.35e-01 -1.15e-01 -9.90e-01 -3.58e-01 -1.09e+00 ph/cm2/s
90%_error_hi 1.03e-01 1.34e-01 1.10e-01 3.84e-01 3.53e-01 6.04e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 304.1645 -26.9646 0.0093 34.1028 83.0413 4.0745148 20.655 TRIG_00704155 Foreground time interval of the image: -8.600 45.464 (delta_t = 54.064 [sec]) Background time interval of the image: -239.576 -8.600 (delta_t = 230.976 [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 -8.600 sec. to 45.464 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17207 ( -0.127129 0.129368 ) Norm@50keV : 4.71694E-03 ( -0.000329096 0.000328006 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.96 using 59 PHA bins. # Reduced chi-squared = 1.105 for 57 degrees of freedom # Null hypothesis probability = 2.735888e-01 Photon flux (15-150 keV) in 54.06 sec: 0.551597 ( -0.040579 0.040811 ) ph/cm2/s Energy fluence (15-150 keV) : 2.60817e-06 ( -1.92679e-07 1.9349e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.600 sec. to 45.464 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16741 ( -0.183282 0.261347 ) Epeak [keV] : 9999.28 ( -9999.3 -9999.3 ) Norm@50keV : 4.74032E-03 ( -0.000326708 0.00147269 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.00 using 59 PHA bins. # Reduced chi-squared = 1.125 for 56 degrees of freedom # Null hypothesis probability = 2.426089e-01 Photon flux (15-150 keV) in 54.06 sec: 0.551486 ( -0.040656 0.04075 ) ph/cm2/s Energy fluence (15-150 keV) : 2.61762e-06 ( -2.6925e-07 2.56179e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.060 sec. to 1.060 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.765962 ( -0.262469 0.278545 ) Norm@50keV : 2.01904E-02 ( -0.00318586 0.00311517 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.73 using 59 PHA bins. # Reduced chi-squared = 0.8198 for 57 degrees of freedom # Null hypothesis probability = 8.322653e-01 Photon flux (15-150 keV) in 1 sec: 2.32388 ( -0.35068 0.35224 ) ph/cm2/s Energy fluence (15-150 keV) : 2.39409e-07 ( -3.71863e-08 3.73107e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.060 sec. to 1.060 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.758009 ( -0.285331 1.16153 ) Epeak [keV] : 10000.00 ( -10000 -10000 ) Norm@50keV : 2.03393E-02 ( -0.00319978 0.00294086 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.73 using 59 PHA bins. # Reduced chi-squared = 0.8344 for 56 degrees of freedom # Null hypothesis probability = 8.066777e-01 Photon flux (15-150 keV) in 1 sec: 2.32233 ( -0.35847 0.35287 ) ph/cm2/s Energy fluence (15-150 keV) : 2.39343e-07 ( -3.75575e-08 3.563e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 44.528 sec. Hardness ratio (energy fluence ratio) = 1.77517067444
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.783743e-07 S(50-150 keV) = 1.8298272e-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 = 8.203585768876454E-02, IMY = -6.721345265118608E-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: -239.576000 -8.600000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 268.2916 -1.2999 13.7 41.1 155.9 -0.3337 -0.8 10.2 SW J1753.5-0127 273.9879 -14.0329 5.0 40.3 134.5 1.1343 2.3 1.1 GX 17+2 285.1404 -24.8769 5.8 39.1 110.9 1.3936 2.0 6.3 HT1900.1-2455 288.8478 10.8709 4.4 20.0 178.9 0.5147 2.6 5.3 GRS 1915+105 299.5797 35.1913 0.3 29.5 -119.3 10.6245 37.6 0.8 Cyg X-1 308.1080 40.9990 2.1 34.1 -104.9 2.1762 5.5 2.8 Cyg X-3 325.9882 38.2205 58.8 35.1 -80.1 -0.0891 -0.2 10.6 Cyg X-2 319.0299 -33.2271 3.0 41.3 62.7 2.8099 3.8 ------ UNKNOWN 347.8492 29.0375 2.6 43.0 -50.1 2.1657 4.4 ------ UNKNOWN 359.5853 26.2438 2.4 52.1 -42.2 4.5633 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -8.600000 45.464000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 268.4937 -1.6225 0.0 41.0 155.4 -0.1948 -1.1 12.7 SW J1753.5-0127 274.1101 -14.2281 4.1 40.3 134.2 -0.6060 -2.8 13.0 GX 17+2 285.1532 -24.9993 4.0 39.2 110.7 -0.9570 -2.9 7.9 HT1900.1-2455 288.9608 10.9799 4.4 19.9 179.2 -0.2248 -2.6 9.8 GRS 1915+105 299.6267 35.1706 57.9 29.5 -119.3 0.0250 0.2 2.6 Cyg X-1 308.0145 40.8158 60.7 34.0 -105.0 0.0315 0.2 9.3 Cyg X-3 326.1948 38.4761 4.8 35.4 -80.1 -0.4386 -2.4 9.3 Cyg X-2 304.1645 -26.9646 0.6 34.1 83.0 4.0746 20.6 ------ UNKNOWN 277.8485 5.7624 2.4 30.7 165.6 0.5187 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 225.724610 357.148400 420.424000 847.724600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6312 22.0143 0.2 21.3 -99.1 22.6884 49.3 0.1 Crab 36.2303 -18.8778 3.4 44.4 40.8 3.9931 3.4 ------ UNKNOWN 21.4966 56.6938 2.6 48.8 157.8 5.9311 4.4 ------ UNKNOWN 60.8090 60.3120 2.5 42.4 -174.8 3.1200 4.6 ------ UNKNOWN