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 Jan 12 02:54:36 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger556870
======================================================================
Trigger: 00556870 Segment: 000
BAT Trigger Time: 391452094.528 [s; MET]
Trigger Stop: 391452095.04 [s; MET]
UTC: 2013-05-28T16:41:23.919600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 138.910917852021 Dec: 87.2757530719287 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.71
Image Trigger?: NO
Rate S/N Ratio: 20.8326666559997 [ if not an image trigger ]
Image S/N Ratio: 9.71
Analysis Position: [ source = BAT ]
RA: 138.910917852021 Dec: 87.2757530719287 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 139.417797129814 Dec: 87.2971203932434 [deg; J2000]
{ 09h 17m 40.3s , +87d 17' 49.6" }
+/- 0.697500366893827 [arcmin] (estimated 90% radius based on SNR)
+/- 0.219460981931097 [arcmin] (formal 1-sigma fit error)
SNR: 50.8892818661436
Angular difference between the analysis and refined position is 1.927871 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 640 +/- 560
Measured from: -9.52799999713898
to: 630.472000002861 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 6.47200000286102
to: 38.472000002861 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.972000002861
to: 14.972000002861 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.52799999713898
to: 710.472000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.650105 3.551960 2.595964 0.562222
0.151122 0.155993 0.136908 0.120616 [error]
Peak 0.014660 0.004868 0.011490 -0.003696
0.005964 0.006025 0.005415 0.004635 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 720.000 -9.528 710.472
T90 640.000 -9.528 630.472
T50 32.000 6.472 38.472
Peak 1.000 13.972 14.972
====== 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 -1.552 -0.093 0.093 - - - 8.38e-04 -4.34e-05 4.33e-05 37.410 57
CPL -1.462 -0.174 0.352 295.263 -295.263 -295.263 9.31e-04 -1.33e-04 4.60e-04 37.200 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -1.896 -2.032 1.266 - - - 1.74e-03 -1.74e-03 1.24e-03 57.270 57
CPL -2.062 -0.026 2.062 26.483 N/A N/A 1.37e-03 N/A N/A 57.200 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 8.09e-07 1.44e-06 1.96e-06 5.54e-06 5.68e-06 9.75e-06 erg/cm2
90%_error_low -7.07e-08 -7.57e-08 -1.36e-07 -7.91e-07 -3.21e-07 -8.99e-07 erg/cm2
90%_error_hi 7.25e-08 7.54e-08 1.36e-07 8.79e-07 3.23e-07 9.71e-07 erg/cm2
Peak flux PL 1.05e-01 8.38e-02 4.50e-02 3.52e-02 2.50e-01 2.69e-01 ph/cm2/s
90%_error_low -8.06e-02 -8.38e-02 -4.11e-02 -3.52e-02 -2.50e-01 -1.55e-01 ph/cm2/s
90%_error_hi 9.07e-02 4.69e-02 4.68e-02 1.42e-01 1.39e-01 1.56e-01 ph/cm2/s
Fluence CPL 7.97e-07 1.45e-06 1.97e-06 4.77e-06 5.63e-06 8.99e-06 erg/cm2
90%_error_low -8.31e-08 -8.51e-08 -1.39e-07 -1.97e-06 -3.66e-07 -2.00e-06 erg/cm2
90%_error_hi 6.53e-08 8.97e-08 1.41e-07 9.61e-07 3.36e-07 1.07e-06 erg/cm2
Peak flux CPL 1.01e-01 6.79e-02 3.50e-02 3.01e-02 2.55e-01 2.75e-01 ph/cm2/s
90%_error_low N/A -6.79e-02 -3.50e-02 -3.01e-02 -2.55e-01 -1.23e-01 ph/cm2/s
90%_error_hi N/A 6.57e-02 2.78e-02 2.91e-02 1.33e-01 1.56e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 139.4178 87.2971 0.0038 18.2537 -9.3901 3.0606977 50.889 TRIG_00556870 Foreground time interval of the image: -9.528 10.173 (delta_t = 19.701 [sec]) Background time interval of the image: -229.627 -9.528 (delta_t = 220.099 [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 -9.528 sec. to 710.472 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.55196 ( -0.0932975 0.0928506 ) Norm@50keV : 8.37706E-04 ( -4.34203e-05 4.32627e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.41 using 59 PHA bins. # Reduced chi-squared = 0.6563 for 57 degrees of freedom # Null hypothesis probability = 9.791377e-01 Photon flux (15-150 keV) in 720 sec: 0.106112 ( -0.005457 0.005468 ) ph/cm2/s Energy fluence (15-150 keV) : 5.67731e-06 ( -3.20914e-07 3.22986e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.528 sec. to 710.472 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.46213 ( -0.173835 0.352162 ) Epeak [keV] : 295.263 ( -295.283 -295.283 ) Norm@50keV : 9.30777E-04 ( -0.000132659 0.000460003 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.20 using 59 PHA bins. # Reduced chi-squared = 0.6643 for 56 degrees of freedom # Null hypothesis probability = 9.750915e-01 Photon flux (15-150 keV) in 720 sec: 0.105570 ( -0.0058007 0.005756 ) ph/cm2/s Energy fluence (15-150 keV) : 5.6298e-06 ( -3.65836e-07 3.35508e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 13.972 sec. to 14.972 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.89595 ( -2.03167 1.26616 ) Norm@50keV : 1.74360E-03 ( -0.00174323 0.00123826 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.27 using 59 PHA bins. # Reduced chi-squared = 1.005 for 57 degrees of freedom # Null hypothesis probability = 4.649770e-01 Photon flux (15-150 keV) in 1 sec: 0.249808 ( -0.249808 0.139063 ) ph/cm2/s Energy fluence (15-150 keV) : 1.60288e-08 ( -1.11906e-08 1.28414e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.972 sec. to 14.972 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.06219 ( -0.025744 2.06219 ) Epeak [keV] : 26.4827 ( ) Norm@50keV : 1.36662E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.20 using 59 PHA bins. # Reduced chi-squared = 1.021 for 56 degrees of freedom # Null hypothesis probability = 4.304801e-01 Photon flux (15-150 keV) in 1 sec: 0.254978 ( -0.254978 0.133162 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 640.0 sec. Hardness ratio (energy fluence ratio) = 1.36420651031
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.2481369e-06 S(50-150 keV) = 3.429132e-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 = 3.254024623275810E-01, IMY = 5.381236035920320E-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: -229.627410 -9.528000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 191.4461 75.1741 3.2 13.8 37.8 0.6968 3.6 ------ UNKNOWN 305.6224 68.3389 2.1 41.6 5.1 1.6659 5.4 ------ UNKNOWN 357.9450 66.5128 3.2 43.0 -24.0 1.2188 3.7 ------ UNKNOWN 351.9042 50.6623 2.2 59.1 -24.2 7.1590 5.1 ------ UNKNOWN 117.9170 15.9242 2.9 56.7 -150.8 4.7543 4.0 ------ UNKNOWN 22.2235 54.4639 3.3 50.6 -44.6 3.9092 3.5 ------ UNKNOWN 82.8427 44.1993 2.7 41.2 -99.3 4.3737 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -9.528000 10.172620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 139.4183 87.2971 0.2 18.3 -9.4 3.0603 51.0 ------ UNKNOWN 121.6152 27.5568 2.5 44.6 -151.7 0.5563 4.7 ------ UNKNOWN 118.0749 17.5154 2.5 55.1 -150.6 1.2026 4.7 ------ UNKNOWN 10.7720 53.2815 2.4 54.0 -37.1 1.6156 4.9 ------ UNKNOWN 88.8364 41.4944 2.4 41.4 -107.1 1.1919 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 53.972590 962.653300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 307.8674 41.0079 6.7 51.7 26.5 -4.2946 -1.7 11.5 Cyg X-3 326.3347 38.1829 0.0 54.5 8.8 -4.4614 -1.6 11.3 Cyg X-2 292.4406 78.8632 2.7 13.6 37.4 2.3028 4.2 ------ UNKNOWN 137.5653 50.0602 2.7 37.2 -162.7 2.9247 4.3 ------ UNKNOWN 123.9072 42.4528 4.0 44.9 -148.4 3.0918 2.9 ------ UNKNOWN 134.2081 28.5336 4.4 58.8 -159.3 10.9053 2.6 ------ UNKNOWN 1.9483 33.2330 2.7 58.8 -26.0 15.1748 4.3 ------ UNKNOWN 21.4767 40.6867 4.1 50.6 -44.6 9.5172 2.8 ------ UNKNOWN 30.2350 43.8367 2.2 47.1 -53.0 13.8485 5.2 ------ UNKNOWN