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 Nov 1 19:23:59 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger615399
======================================================================
Trigger: 00615399 Segment: 000
BAT Trigger Time: 435057192 [s; MET]
Trigger Stop: 435057194.048 [s; MET]
UTC: 2014-10-15T09:12:59.342640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 87.5070360636474 Dec: 18.3158336047902 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.99
Image Trigger?: NO
Rate S/N Ratio: 9.79795897113271 [ if not an image trigger ]
Image S/N Ratio: 7.99
Analysis Position: [ source = BAT ]
RA: 87.5070360636474 Dec: 18.3158336047902 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 87.5328900728971 Dec: 18.3710803332857 [deg; J2000]
{ 05h 50m 07.9s , +18d 22' 15.9" }
+/- 2.27606275593112 [arcmin] (estimated 90% radius based on SNR)
+/- 0.887245980517269 [arcmin] (formal 1-sigma fit error)
SNR: 9.39410026028003
Angular difference between the analysis and refined position is 3.627111 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 11 +/- 4.12310562561766
Measured from: 0
to: 11 [s; relative to TRIGTIME]
T50: 5 +/- 2.23606797749979
Measured from: 1
to: 6 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1
to: 2 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 13 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.112831 0.108806 0.066054 0.028502
0.021240 0.021524 0.018270 0.015567 [error]
Peak 0.027789 0.032608 0.007698 -0.003633
0.006063 0.006216 0.005165 0.004209 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 13.000 0.000 13.000
T90 11.000 0.000 11.000
T50 5.000 1.000 6.000
Peak 1.000 1.000 2.000
====== 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 -1.849 -0.378 0.352 - - - 1.33e-03 -3.34e-04 3.22e-04 63.780 57
CPL -1.635 -0.608 2.094 66.862 -66.834 -66.862 1.80e-03 -1.80e-03 4.16e-02 63.710 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 -2.095 -0.447 0.397 - - - 3.46e-03 -1.15e-03 1.15e-03 55.840 57
CPL 2.643 -3.000 -2.643 31.843 -5.346 6.980 4.96e+00 -4.96e+00 8.34e+05 47.430 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 3.07e-08 4.56e-08 5.07e-08 1.06e-07 1.59e-07 2.33e-07 erg/cm2
90%_error_low -8.32e-09 -9.11e-09 -1.65e-08 -5.54e-08 -3.86e-08 -7.69e-08 erg/cm2
90%_error_hi 8.55e-09 9.08e-09 1.73e-08 8.70e-08 4.04e-08 1.02e-07 erg/cm2
Peak flux PL 2.52e-01 1.79e-01 8.41e-02 5.54e-02 5.42e-01 5.71e-01 ph/cm2/s
90%_error_low -7.59e-02 -4.65e-02 -3.40e-02 -3.23e-02 -1.36e-01 -1.46e-01 ph/cm2/s
90%_error_hi 7.85e-02 4.61e-02 3.71e-02 5.22e-02 1.36e-01 1.48e-01 ph/cm2/s
Fluence CPL 3.05e-08 4.71e-08 4.97e-08 6.60e-08 1.54e-07 1.93e-07 erg/cm2
90%_error_low -8.65e-09 -1.04e-08 -2.56e-08 N/A -5.05e-08 -8.82e-08 erg/cm2
90%_error_hi 8.66e-09 1.34e-08 1.81e-08 N/A 4.11e-08 7.64e-08 erg/cm2
Peak flux CPL N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_low -7.59e-02 -4.65e-02 -3.40e-02 -3.23e-02 -1.36e-01 -1.46e-01 ph/cm2/s
90%_error_hi 7.85e-02 4.61e-02 3.71e-02 5.22e-02 1.36e-01 1.48e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 87.5329 18.3711 0.0206 9.9948 -85.4842 0.3580594 9.394 TRIG_00615399 Foreground time interval of the image: 0.000 13.000 (delta_t = 13.000 [sec]) Background time interval of the image: -239.000 0.000 (delta_t = 239.000 [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 0.000 sec. to 13.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.84908 ( -0.377763 0.351784 ) Norm@50keV : 1.33196E-03 ( -0.00033417 0.000321916 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.78 using 59 PHA bins. # Reduced chi-squared = 1.119 for 57 degrees of freedom # Null hypothesis probability = 2.502835e-01 Photon flux (15-150 keV) in 13 sec: 0.187162 ( -0.037009 0.037009 ) ph/cm2/s Energy fluence (15-150 keV) : 1.59244e-07 ( -3.86279e-08 4.03716e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 13.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.6347 ( -0.60779 2.09409 ) Epeak [keV] : 66.8624 ( -66.8323 -66.8605 ) Norm@50keV : 1.80095E-03 ( -0.00180084 0.0416356 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.71 using 59 PHA bins. # Reduced chi-squared = 1.138 for 56 degrees of freedom # Null hypothesis probability = 2.237137e-01 Photon flux (15-150 keV) in 13 sec: 0.185812 ( -0.037964 0.037798 ) ph/cm2/s Energy fluence (15-150 keV) : 1.54164e-07 ( -5.0542e-08 4.10956e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.000 sec. to 2.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.09451 ( -0.449944 0.394472 ) Norm@50keV : 3.45512E-03 ( -0.00115535 0.00115051 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.84 using 59 PHA bins. # Reduced chi-squared = 0.9797 for 57 degrees of freedom # Null hypothesis probability = 5.185144e-01 Photon flux (15-150 keV) in 1 sec: 0.542203 ( -0.136087 0.136337 ) ph/cm2/s Energy fluence (15-150 keV) : 3.21166e-08 ( -9.61725e-09 1.02623e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.000 sec. to 2.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 3.81451 ( -3.0408 -2.68386 ) Epeak [keV] : 31.0955 ( -5.29431 7.03149 ) Norm@50keV : 32.8041 ( -30.5073 833543 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.34 using 59 PHA bins. # Reduced chi-squared = 0.8454 for 56 degrees of freedom # Null hypothesis probability = 7.883289e-01 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 2.43933e-08 ( -7.06604e-09 7.86935e-09 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 11.0 sec. Hardness ratio (energy fluence ratio) = 1.11032472237
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.636056e-08 S(50-150 keV) = 8.288252e-08
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 = 1.387558749205185E-02, IMY = 1.756858894476089E-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: -239.000000 0.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6295 22.0130 0.2 7.7 -116.2 10.0618 47.7 0.2 Crab 67.7510 -35.9292 2.7 54.0 21.4 5.8022 4.2 ------ UNKNOWN 67.7477 -10.9054 2.0 29.7 30.8 1.5814 5.6 ------ UNKNOWN 55.7108 54.3462 2.7 40.5 172.9 1.4863 4.2 ------ UNKNOWN 121.4674 60.1086 3.1 53.2 -142.2 4.5747 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.000000 13.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7779 21.9499 17.7 7.8 -115.2 -0.0248 -0.7 8.9 Crab 37.8314 43.4917 2.5 42.2 148.9 0.4267 4.6 ------ UNKNOWN 52.4001 25.2777 3.0 24.3 125.3 0.1923 3.9 ------ UNKNOWN 87.5329 18.3711 1.2 10.0 -85.5 0.3581 9.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 356.100590 708.400600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 229.6566 50.0877 4.4 58.7 -159.2 5.1830 2.6 ------ UNKNOWN 175.5837 -31.3116 2.4 54.3 -36.0 7.0517 4.7 ------ UNKNOWN