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: Mon Mar 3 23:55:21 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger585834
======================================================================
Trigger: 00585834 Segment: 000
BAT Trigger Time: 413363851.776 [s; MET]
Trigger Stop: 413363852.8 [s; MET]
UTC: 2014-02-06T07:17:20.165420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 145.350247125002 Dec: 66.7503930303182 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.35
Image Trigger?: NO
Rate S/N Ratio: 52.820450584977 [ if not an image trigger ]
Image S/N Ratio: 18.35
Analysis Position: [ source = BAT ]
RA: 145.350247125002 Dec: 66.7503930303182 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 145.321432651379 Dec: 66.7609958708438 [deg; J2000]
{ 09h 41m 17.1s , +66d 45' 39.6" }
+/- 0.690661747345658 [arcmin] (estimated 90% radius based on SNR)
+/- 0.198550636252018 [arcmin] (formal 1-sigma fit error)
SNR: 51.6106385954751
Angular difference between the analysis and refined position is 0.932871 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 94.1879999041557 +/- 18.3610798297631
Measured from: 1.87999999523163
to: 96.0679998993874 [s; relative to TRIGTIME]
T50: 11.3839999437332 +/- 19.6462154393177
Measured from: 51.6839999556541
to: 63.0679998993874 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 60.8039999604225
to: 61.8039999604225 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.3040000200272
to: 256.060000002384 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.484973 10.443103 7.999963 1.693059
0.108077 0.114834 0.103035 0.087529 [error]
Peak 0.569354 0.969866 0.902770 0.196029
0.013324 0.017050 0.016707 0.009710 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 294.364 -38.304 256.060
T90 94.188 1.880 96.068
T50 11.384 51.684 63.068
Peak 1.000 60.804 61.804
====== 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: CPL)
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 -1.510 -0.033 0.033 - - - 6.02e-03 -1.04e-04 1.04e-04 64.040 57
CPL -1.142 -0.141 0.145 133.610 -22.100 46.299 8.71e-03 -1.12e-03 1.33e-03 43.470 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.271 -0.038 0.038 - - - 1.74e-01 -3.90e-03 3.90e-03 100.760 57
CPL -0.536 -0.174 0.181 115.633 -12.020 18.234 3.67e-01 -5.77e-02 7.12e-02 43.200 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 2.29e-06 4.17e-06 5.86e-06 1.73e-05 1.68e-05 2.96e-05 erg/cm2
90%_error_low -8.39e-08 -8.87e-08 -1.18e-07 -8.06e-07 -2.95e-07 -8.53e-07 erg/cm2
90%_error_hi 8.52e-08 8.87e-08 1.18e-07 8.32e-07 2.95e-07 8.74e-07 erg/cm2
Peak flux PL 1.73e-03 2.23e-02 2.39e-01 2.20e+01 5.39e-01 2.21e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 2.06e-06 4.23e-06 6.05e-06 1.12e-05 1.64e-05 2.35e-05 erg/cm2
90%_error_low -1.13e-07 -9.32e-08 -1.38e-07 -1.59e-06 -3.30e-07 -1.62e-06 erg/cm2
90%_error_hi 1.15e-07 9.35e-08 1.39e-07 1.92e-06 3.30e-07 1.94e-06 erg/cm2
Peak flux CPL 4.71e+00 6.85e+00 6.01e+00 4.26e+00 1.99e+01 2.18e+01 ph/cm2/s
90%_error_low -3.24e-01 -1.97e-01 -1.79e-01 -5.07e-01 -5.14e-01 -7.50e-01 ph/cm2/s
90%_error_hi 3.32e-01 1.97e-01 1.80e-01 5.87e-01 5.16e-01 7.98e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 145.3214 66.7610 0.0037 4.2264 40.2147 5.4223765 51.611 TRIG_00585834 Foreground time interval of the image: -38.304 11.925 (delta_t = 50.229 [sec]) Background time interval of the image: -239.776 -38.304 (delta_t = 201.472 [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 -38.304 sec. to 256.060 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.50991 ( -0.0331718 0.0331952 ) Norm@50keV : 6.02260E-03 ( -0.000103991 0.000103975 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.04 using 59 PHA bins. # Reduced chi-squared = 1.123 for 57 degrees of freedom # Null hypothesis probability = 2.432861e-01 Photon flux (15-150 keV) in 294.4 sec: 0.753898 ( -0.01524 0.015294 ) ph/cm2/s Energy fluence (15-150 keV) : 1.67953e-05 ( -2.94789e-07 2.94912e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.304 sec. to 256.060 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.14172 ( -0.14124 0.145486 ) Epeak [keV] : 133.610 ( -22.1002 46.2994 ) Norm@50keV : 8.70879E-03 ( -0.00112313 0.00132938 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.47 using 59 PHA bins. # Reduced chi-squared = 0.7762 for 56 degrees of freedom # Null hypothesis probability = 8.890975e-01 Photon flux (15-150 keV) in 294.4 sec: 0.729611 ( -0.017378 0.017495 ) ph/cm2/s Energy fluence (15-150 keV) : 1.64047e-05 ( -3.30164e-07 3.29637e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 60.804 sec. to 61.804 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27101 ( -0.0381467 0.0381589 ) Norm@50keV : 0.174450 ( -0.0038987 0.00389813 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 100.76 using 59 PHA bins. # Reduced chi-squared = 1.7677 for 57 degrees of freedom # Null hypothesis probability = 3.143668e-04 Photon flux (15-150 keV) in 1 sec: 0.539076 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.7366e-06 ( -4.09743e-08 4.10244e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 60.804 sec. to 61.804 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.535721 ( -0.174347 0.180859 ) Epeak [keV] : 115.633 ( -12.0208 18.234 ) Norm@50keV : 0.366541 ( -0.0577349 0.0711554 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.20 using 59 PHA bins. # Reduced chi-squared = 0.7715 for 56 degrees of freedom # Null hypothesis probability = 8.946276e-01 Photon flux (15-150 keV) in 1 sec: 19.9472 ( -0.5142 0.5164 ) ph/cm2/s Energy fluence (15-150 keV) : 1.69029e-06 ( -4.32278e-08 4.31547e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 94.188 sec. Hardness ratio (energy fluence ratio) = 1.43126420724
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.287703e-06 S(50-150 keV) = 1.0116982e-05
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 = 5.643112671702254E-02, IMY = -4.771279825754147E-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: -239.776000 -38.304000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 139.9566 78.6544 3.2 9.2 -82.0 0.6840 3.6 ------ UNKNOWN 31.5708 64.5379 2.3 36.2 -130.6 1.4812 5.0 ------ UNKNOWN 252.4609 51.3447 3.5 50.5 -39.2 2.6299 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -38.304000 11.924600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 88.3776 32.9145 3.2 45.2 156.0 0.9394 3.6 ------ UNKNOWN 145.3215 66.7610 0.2 4.2 40.2 5.4218 51.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 32.524600 782.267900 840.224000 962.356400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.9787 35.0961 2.5 35.0 45.3 5.5405 4.6 ------ UNKNOWN 145.3300 66.7543 0.4 0.0 -170.0 21.5634 32.5 ------ UNKNOWN 44.5102 71.5639 2.9 32.0 -132.5 3.8499 4.0 ------ UNKNOWN 246.7766 48.5016 4.2 50.5 -39.2 7.5819 2.7 ------ UNKNOWN