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 21:29:32 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger603954
======================================================================
Trigger: 00603954 Segment: 000
BAT Trigger Time: 426680212.288 [s; MET]
Trigger Stop: 426680213.312 [s; MET]
UTC: 2014-07-10T10:16:40.041420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 41.0871768965041 Dec: 35.4932251244368 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.54
Image Trigger?: NO
Rate S/N Ratio: 20.2731349327133 [ if not an image trigger ]
Image S/N Ratio: 11.54
Analysis Position: [ source = BAT ]
RA: 41.0871768965041 Dec: 35.4932251244368 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 41.0865779780287 Dec: 35.4987180474495 [deg; J2000]
{ 02h 44m 20.8s , +35d 29' 55.4" }
+/- 1.83052885375025 [arcmin] (estimated 90% radius based on SNR)
+/- 0.913692354993513 [arcmin] (formal 1-sigma fit error)
SNR: 12.8235710277597
Angular difference between the analysis and refined position is 0.330871 arcmin
Partial Coding Fraction: 0.5859375 [ including projection effects ]
Duration
T90: 3 +/- 2.23606797749979
Measured from: -0.287999987602234
to: 2.71200001239777 [s; relative to TRIGTIME]
T50: 1 +/- 1
Measured from: -0.287999987602234
to: 0.712000012397766 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.287999987602234
to: 0.712000012397766 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.287999987602234
to: 3.71200001239777 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.160458 0.159069 0.075023 0.016506
0.017182 0.017892 0.015773 0.014037 [error]
Peak 0.057864 0.053592 0.045052 0.015592
0.008974 0.009690 0.008673 0.007297 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 4.000 -0.288 3.712
T90 3.000 -0.288 2.712
T50 1.000 -0.288 0.712
Peak 1.000 -0.288 0.712
====== 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 -2.037 -0.238 0.221 - - - 6.19e-03 -1.01e-03 9.80e-04 50.360 57
CPL -0.964 -1.010 1.279 39.555 N/A N/A 2.62e-02 N/A N/A 47.040 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 -1.658 -0.285 0.271 - - - 1.13e-02 -2.02e-03 1.98e-03 76.710 57
CPL -0.624 -1.143 1.858 64.314 -17.499 -64.314 3.90e-02 -3.90e-02 2.87e-01 74.970 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 5.25e-08 6.97e-08 6.79e-08 1.18e-07 2.29e-07 3.08e-07 erg/cm2
90%_error_low -8.72e-09 -8.78e-09 -1.46e-08 -4.32e-08 -3.41e-08 -6.23e-08 erg/cm2
90%_error_hi 8.93e-09 8.75e-09 1.50e-08 5.68e-08 3.49e-08 7.25e-08 erg/cm2
Peak flux PL 5.40e-01 4.95e-01 3.14e-01 3.05e-01 1.48e+00 1.65e+00 ph/cm2/s
90%_error_low -1.33e-01 -8.27e-02 -7.12e-02 -1.17e-01 -2.43e-01 -2.74e-01 ph/cm2/s
90%_error_hi 1.41e-01 8.23e-02 7.04e-02 1.52e-01 2.43e-01 2.75e-01 ph/cm2/s
Fluence CPL 4.83e-08 7.91e-08 6.40e-08 2.42e-08 2.09e-07 2.16e-07 erg/cm2
90%_error_low -1.01e-08 -1.24e-08 -1.86e-08 -1.88e-08 -3.49e-08 -4.04e-08 erg/cm2
90%_error_hi 9.98e-09 1.28e-08 1.76e-08 8.06e-08 3.84e-08 8.53e-08 erg/cm2
Peak flux CPL 4.58e-01 5.50e-01 3.37e-01 1.13e-01 1.43e+00 1.46e+00 ph/cm2/s
90%_error_low -1.80e-01 -1.08e-01 -8.22e-02 -1.13e-01 -2.58e-01 -2.80e-01 ph/cm2/s
90%_error_hi 1.76e-01 1.13e-01 8.55e-02 2.40e-01 2.53e-01 3.56e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 41.0866 35.4987 0.0150 36.6899 -152.2813 0.4147422 12.824 TRIG_00603954 Foreground time interval of the image: -0.288 3.712 (delta_t = 4.000 [sec]) Background time interval of the image: -617.787 -528.074 (delta_t = 89.713 [sec]) -239.288 -0.288 (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 -0.288 sec. to 3.712 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.03718 ( -0.237655 0.221124 ) Norm@50keV : 6.19134E-03 ( -0.00100561 0.000980248 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.36 using 59 PHA bins. # Reduced chi-squared = 0.8835 for 57 degrees of freedom # Null hypothesis probability = 7.206078e-01 Photon flux (15-150 keV) in 4 sec: 0.945013 ( -0.117083 0.117097 ) ph/cm2/s Energy fluence (15-150 keV) : 2.28944e-07 ( -3.40722e-08 3.4883e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.288 sec. to 3.712 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.963825 ( -1.00967 1.27918 ) Epeak [keV] : 39.5551 ( ) Norm@50keV : 2.62387E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.04 using 59 PHA bins. # Reduced chi-squared = 0.8401 for 56 degrees of freedom # Null hypothesis probability = 7.973538e-01 Photon flux (15-150 keV) in 4 sec: 0.915280 ( -0.119836 0.12012 ) ph/cm2/s Energy fluence (15-150 keV) : 2.08968e-07 ( -3.48595e-08 3.84492e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.288 sec. to 0.712 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.6576 ( -0.28488 0.27066 ) Norm@50keV : 1.12700E-02 ( -0.00202067 0.00197989 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 76.71 using 59 PHA bins. # Reduced chi-squared = 1.346 for 57 degrees of freedom # Null hypothesis probability = 4.194527e-02 Photon flux (15-150 keV) in 1 sec: 1.47535 ( -0.24313 0.24332 ) ph/cm2/s Energy fluence (15-150 keV) : 1.04751e-07 ( -1.96176e-08 1.99156e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.288 sec. to 0.712 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.623982 ( -1.14541 1.85622 ) Epeak [keV] : 64.3144 ( -17.4667 -64.2823 ) Norm@50keV : 3.89592E-02 ( -0.0390863 0.286441 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.97 using 59 PHA bins. # Reduced chi-squared = 1.339 for 56 degrees of freedom # Null hypothesis probability = 4.607899e-02 Photon flux (15-150 keV) in 1 sec: 1.42676 ( -0.25774 0.25343 ) ph/cm2/s Energy fluence (15-150 keV) : 9.85553e-08 ( -2.02953e-08 2.14057e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 3.0 sec. Hardness ratio (energy fluence ratio) = 0.97460786532
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.2215352e-07 S(50-150 keV) = 1.0679226e-07
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 = -6.595959057654972E-01, IMY = 3.465701845356184E-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: -617.787410 -528.074300 -239.288000 -0.288000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 34.9368 -36.5817 3.5 37.4 51.1 1.8086 3.3 ------ UNKNOWN 12.1687 12.9981 2.4 37.0 148.6 2.1714 4.7 ------ UNKNOWN 70.4000 -34.1562 2.5 40.0 4.4 1.6834 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.288000 3.712000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 20.4456 40.6399 2.7 47.9 -171.5 0.2094 4.3 ------ UNKNOWN 85.5386 -26.3960 2.2 45.2 -16.8 0.2222 5.2 ------ UNKNOWN 41.0866 35.4987 0.9 36.7 -152.3 0.4147 12.8 ------ UNKNOWN 15.0094 51.7186 2.7 59.0 -166.9 0.6259 4.2 ------ UNKNOWN 88.5484 0.9607 1.9 41.8 -56.9 0.4047 6.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 82.012590 653.112600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6306 22.0131 0.6 39.3 -74.2 23.2987 19.4 0.2 Crab 338.9420 52.4758 2.6 46.2 139.3 7.4422 4.4 ------ UNKNOWN 20.6628 10.3706 2.7 31.2 49.0 2.4809 4.3 ------ UNKNOWN 339.5967 62.9115 2.9 46.1 153.8 3.9823 3.9 ------ UNKNOWN 28.9823 62.0574 2.5 27.6 175.4 1.8919 4.5 ------ UNKNOWN 48.0960 1.0510 3.7 35.0 -4.8 1.5152 3.1 ------ UNKNOWN 169.7148 83.0760 3.3 59.0 -166.1 9.0209 3.5 ------ UNKNOWN