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 Oct 4 20:50:06 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger611599
======================================================================
Trigger: 00611599 Segment: 000
BAT Trigger Time: 431449242.7 [s; MET]
Trigger Stop: 431449242.764 [s; MET]
UTC: 2014-09-03T15:00:30.220440 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 238.036254941297 Dec: 27.5784667537245 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.57
Image Trigger?: NO
Rate S/N Ratio: 44.4747119158742 [ if not an image trigger ]
Image S/N Ratio: 12.57
Analysis Position: [ source = BAT ]
RA: 238.036254941297 Dec: 27.5784667537245 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 238.021220308435 Dec: 27.6075573095436 [deg; J2000]
{ 15h 52m 05.1s , +27d 36' 27.2" }
+/- 1.0344583871983 [arcmin] (estimated 90% radius based on SNR)
+/- 0.358108946156831 [arcmin] (formal 1-sigma fit error)
SNR: 28.980092854165
Angular difference between the analysis and refined position is 1.919817 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 0.295999944210052 +/- 0.0341760284313824
Measured from: 0.00400000810623169
to: 0.299999952316284 [s; relative to TRIGTIME]
T50: 0.13999992609024 +/- 0.0178885534162405
Measured from: 0.0480000376701355
to: 0.187999963760376 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.329999983310699
to: 0.670000016689301 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0119999647140503
to: 0.34799998998642 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.095249 0.108348 0.054913 0.006811
0.005642 0.005947 0.004675 0.003230 [error]
Peak 0.113920 0.116689 0.062991 0.003350
0.007267 0.007660 0.006110 0.004651 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.360 -0.012 0.348
T90 0.296 0.004 0.300
T50 0.140 0.048 0.188
Peak 1.000 -0.330 0.670
====== 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: 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 -1.987 -0.122 0.118 - - - 4.06e-02 -3.21e-03 3.17e-03 76.070 57
CPL -1.361 -0.483 0.550 44.169 -12.016 16.195 9.16e-02 -4.20e-02 9.52e-02 71.010 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 -2.029 -0.144 0.139 - - - 1.64e-02 -1.54e-03 1.51e-03 51.790 57
CPL -1.566 -0.527 0.602 40.250 N/A N/A 3.00e-02 N/A N/A 49.550 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 2.96e-08 4.04e-08 4.08e-08 7.47e-08 1.35e-07 1.85e-07 erg/cm2
90%_error_low -2.84e-09 -2.67e-09 -4.34e-09 -1.47e-08 -1.01e-08 -1.97e-08 erg/cm2
90%_error_hi 2.90e-09 2.67e-09 4.37e-09 1.69e-08 1.02e-08 2.12e-08 erg/cm2
Peak flux PL 1.12e+00 8.29e-01 4.07e-01 2.83e-01 2.49e+00 2.64e+00 ph/cm2/s
90%_error_low -1.23e-01 -6.19e-02 -4.99e-02 -6.18e-02 -1.88e-01 -1.98e-01 ph/cm2/s
90%_error_hi 1.26e-01 6.19e-02 5.03e-02 7.16e-02 1.88e-01 1.98e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -2.84e-09 -2.67e-09 -4.34e-09 -1.47e-08 -1.01e-08 -1.97e-08 erg/cm2
90%_error_hi 2.90e-09 2.67e-09 4.37e-09 1.69e-08 1.02e-08 2.12e-08 erg/cm2
Peak flux CPL 1.07e+00 8.74e-01 4.07e-01 1.54e-01 2.45e+00 2.50e+00 ph/cm2/s
90%_error_low -1.39e-01 -7.92e-02 -5.43e-02 -7.83e-02 -1.95e-01 -2.16e-01 ph/cm2/s
90%_error_hi 1.41e-01 8.15e-02 5.39e-02 1.54e-01 1.95e-01 2.39e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 238.0212 27.6076 0.0066 16.8108 122.4311 0.2810077 28.980 TRIG_00611599 Foreground time interval of the image: -0.012 0.348 (delta_t = 0.360 [sec]) Background time interval of the image: -153.999 -0.012 (delta_t = 153.987 [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 -0.012 sec. to 0.348 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.98685 ( -0.121846 0.118378 ) Norm@50keV : 4.06275E-02 ( -0.00321186 0.0031712 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 76.07 using 59 PHA bins. # Reduced chi-squared = 1.335 for 57 degrees of freedom # Null hypothesis probability = 4.651458e-02 Photon flux (15-150 keV) in 0.36 sec: 6.05803 ( -0.4074 0.40769 ) ph/cm2/s Energy fluence (15-150 keV) : 1.34813e-07 ( -1.0143e-08 1.02384e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.012 sec. to 0.348 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.36142 ( -0.483178 0.550409 ) Epeak [keV] : 44.1689 ( -12.0154 16.1955 ) Norm@50keV : 9.15820E-02 ( -0.0419683 0.0952287 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.01 using 59 PHA bins. # Reduced chi-squared = 1.268 for 56 degrees of freedom # Null hypothesis probability = 8.538761e-02 Photon flux (15-150 keV) in 0.36 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.330 sec. to 0.670 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.02877 ( -0.144344 0.13888 ) Norm@50keV : 1.64052E-02 ( -0.00153568 0.00150967 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.79 using 59 PHA bins. # Reduced chi-squared = 0.9085 for 57 degrees of freedom # Null hypothesis probability = 6.704179e-01 Photon flux (15-150 keV) in 1 sec: 2.49411 ( -0.18807 0.18817 ) ph/cm2/s Energy fluence (15-150 keV) : 1.51572e-07 ( -1.31771e-08 1.33505e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.330 sec. to 0.670 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.56553 ( -0.526931 0.602414 ) Epeak [keV] : 40.2502 ( ) Norm@50keV : 3.00434E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.55 using 59 PHA bins. # Reduced chi-squared = 0.8847 for 56 degrees of freedom # Null hypothesis probability = 7.161151e-01 Photon flux (15-150 keV) in 1 sec: 2.44914 ( -0.19454 0.19464 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = -1.620241102932698E-01, IMY = -2.550032619289736E-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: -153.999400 -0.012000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6661 35.4357 5.2 27.7 89.4 -0.4314 -2.2 11.6 Her X-1 272.9514 43.5229 2.8 40.6 71.6 2.3390 4.1 ------ UNKNOWN 228.3819 19.1458 2.6 17.7 164.4 0.5497 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.012000 0.348000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5994 35.1856 6.8 27.7 90.0 -0.0265 -1.7 11.7 Her X-1 238.0212 27.6076 0.4 16.8 122.4 0.2810 29.0 ------ UNKNOWN 204.6608 19.0780 3.0 21.6 -125.8 0.0370 3.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 47.800600 962.368400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9742 -15.6414 0.4 43.8 170.5 28.4158 25.9 0.3 Sco X-1 254.3876 35.4999 32.8 16.0 56.5 0.1807 0.4 10.0 Her X-1 268.4907 -1.4930 789.9 41.3 130.0 0.0270 0.0 7.7 SW J1753.5-0127 244.0637 -28.9237 2.5 56.8 173.9 13.5415 4.5 ------ UNKNOWN 248.5759 38.1075 3.4 13.7 37.6 1.9017 3.4 ------ UNKNOWN 184.8288 65.4243 3.6 50.1 -25.5 3.7609 3.2 ------ UNKNOWN 205.5212 19.6617 3.9 30.7 -97.6 2.4357 3.0 ------ UNKNOWN 208.4495 1.6468 3.3 38.4 -127.2 3.3519 3.5 ------ UNKNOWN 202.6122 -6.0754 3.5 48.0 -129.0 9.4978 3.3 ------ UNKNOWN