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 02:48:09 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger556930
======================================================================
Trigger: 00556930 Segment: 000
BAT Trigger Time: 391518936 [s; MET]
Trigger Stop: 391519000 [s; MET]
UTC: 2013-05-29T11:15:25.388620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 24.2588443927767 Dec: -64.1383871612738 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.22
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.22
Analysis Position: [ source = BAT ]
RA: 24.2588443927767 Dec: -64.1383871612738 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 24.3081515004987 Dec: -64.1305370416994 [deg; J2000]
{ 01h 37m 14.0s , -64d 07' 49.9" }
+/- 1.5502380195838 [arcmin] (estimated 90% radius based on SNR)
+/- 0.616314714947689 [arcmin] (formal 1-sigma fit error)
SNR: 16.2600055280406
Angular difference between the analysis and refined position is 1.373904 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 87.5919999480247 +/- 11.0791425584706
Measured from: 42.4079999923706
to: 129.999999940395 [s; relative to TRIGTIME]
T50: 41.2159999608994 +/- 18.7858504970482
Measured from: 59.1480000019073
to: 100.363999962807 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 59.1320000290871
to: 60.1320000290871 [s; relative to TRIGTIME]
Total Fluence
Measured from: 36.1280000209808
to: 146.459999978542 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.694293 0.843487 0.592798 0.119075
0.059199 0.061343 0.054634 0.047801 [error]
Peak 0.014150 0.027085 0.016748 0.004640
0.005886 0.006047 0.005362 0.004498 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 110.332 36.128 146.460
T90 87.592 42.408 130.000
T50 41.216 59.148 100.364
Peak 1.000 59.132 60.132
====== 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 -1.609 -0.146 0.144 - - - 1.22e-03 -1.10e-04 1.08e-04 58.060 57
CPL -1.205 -0.484 0.615 88.931 -30.833 -88.931 2.03e-03 -8.79e-04 2.32e-03 56.450 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 -1.592 -0.504 0.464 - - - 3.75e-03 -1.17e-03 1.13e-03 56.610 57
CPL 0.155 -2.352 5.144 55.794 -29.131 -55.794 3.29e-02 -3.29e-02 1.13e+01 55.310 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 1.90e-07 3.27e-07 4.29e-07 1.14e-06 1.26e-06 2.09e-06 erg/cm2
90%_error_low -2.40e-08 -2.68e-08 -5.17e-08 -2.61e-07 -1.22e-07 -3.13e-07 erg/cm2
90%_error_hi 2.47e-08 2.68e-08 5.19e-08 3.10e-07 1.24e-07 3.53e-07 erg/cm2
Peak flux PL 1.69e-01 1.61e-01 1.07e-01 1.10e-01 4.81e-01 5.46e-01 ph/cm2/s
90%_error_low -6.71e-02 -4.49e-02 -4.15e-02 -6.57e-02 -1.32e-01 -1.55e-01 ph/cm2/s
90%_error_hi 7.35e-02 4.47e-02 4.17e-02 1.05e-01 1.33e-01 1.60e-01 ph/cm2/s
Fluence CPL 1.82e-07 3.44e-07 4.30e-07 5.71e-07 1.20e-06 1.53e-06 erg/cm2
90%_error_low -2.71e-08 -3.44e-08 -5.57e-08 -3.27e-07 -1.40e-07 -3.60e-07 erg/cm2
90%_error_hi 2.72e-08 3.54e-08 5.53e-08 6.66e-07 1.43e-07 6.92e-07 erg/cm2
Peak flux CPL 1.31e-01 1.91e-01 1.11e-01 2.00e-02 4.50e-01 4.53e-01 ph/cm2/s
90%_error_low -1.31e-01 -6.29e-02 -5.13e-02 -2.00e-02 -1.44e-01 -1.46e-01 ph/cm2/s
90%_error_hi 9.20e-02 6.68e-02 5.09e-02 9.26e-02 1.41e-01 1.85e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 24.3082 -64.1305 0.0118 9.4972 -126.9359 1.1279834 16.260 TRIG_00556930 Foreground time interval of the image: 36.128 72.501 (delta_t = 36.373 [sec]) Background time interval of the image: -465.699 -449.564 (delta_t = 16.135 [sec]) -239.000 36.128 (delta_t = 275.128 [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 36.128 sec. to 146.460 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.60872 ( -0.146453 0.144099 ) Norm@50keV : 1.22007E-03 ( -0.000109576 0.00010837 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.06 using 59 PHA bins. # Reduced chi-squared = 1.019 for 57 degrees of freedom # Null hypothesis probability = 4.360963e-01 Photon flux (15-150 keV) in 110.3 sec: 0.157217 ( -0.012831 0.012835 ) ph/cm2/s Energy fluence (15-150 keV) : 1.25741e-06 ( -1.21626e-07 1.23534e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 36.128 sec. to 146.460 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.20464 ( -0.483611 0.615031 ) Epeak [keV] : 88.9309 ( -30.8334 -88.9309 ) Norm@50keV : 2.03219E-03 ( -0.000879442 0.00231838 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.45 using 59 PHA bins. # Reduced chi-squared = 1.008 for 56 degrees of freedom # Null hypothesis probability = 4.580259e-01 Photon flux (15-150 keV) in 110.3 sec: 0.154466 ( -0.013354 0.013341 ) ph/cm2/s Energy fluence (15-150 keV) : 1.2023e-06 ( -1.40399e-07 1.42893e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 59.132 sec. to 60.132 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.59196 ( -0.503924 0.463889 ) Norm@50keV : 3.75045E-03 ( -0.00116906 0.00112704 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.61 using 59 PHA bins. # Reduced chi-squared = 0.9932 for 57 degrees of freedom # Null hypothesis probability = 4.896599e-01 Photon flux (15-150 keV) in 1 sec: 0.480774 ( -0.132492 0.132528 ) ph/cm2/s Energy fluence (15-150 keV) : 3.5114e-08 ( -1.13981e-08 1.19274e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.132 sec. to 60.132 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.155263 ( -2.38282 5.11294 ) Epeak [keV] : 55.7945 ( -28.9151 -55.579 ) Norm@50keV : 3.29253E-02 ( -0.0350527 11.3394 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.31 using 59 PHA bins. # Reduced chi-squared = 0.9877 for 56 degrees of freedom # Null hypothesis probability = 5.008038e-01 Photon flux (15-150 keV) in 1 sec: 0.450181 ( -0.143527 0.141041 ) ph/cm2/s Energy fluence (15-150 keV) : 3.0334e-08 ( -1.04108e-08 1.36627e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 87.592 sec. Hardness ratio (energy fluence ratio) = 1.31159561787
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.175542e-07 S(50-150 keV) = 7.398614e-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 = -1.005298123265684E-01, IMY = 1.337184207226820E-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: -465.699400 -449.564300 -239.000000 36.128000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5134 -40.6786 11.8 57.4 -8.9 1.3195 1.0 7.5 Vela X-1 169.9734 -60.5052 36.3 44.2 24.8 0.1617 0.3 12.3 Cen X-3 186.7563 -62.7379 216.9 43.3 36.6 0.0311 0.1 3.4 GX 301-2 296.2606 -49.5125 2.2 42.0 122.2 4.9608 5.2 ------ UNKNOWN 152.4087 -54.4010 3.1 47.7 9.9 1.8592 3.7 ------ UNKNOWN 151.9749 -48.5695 2.3 53.2 7.5 4.5405 5.1 ------ UNKNOWN 358.9529 -16.2769 4.8 58.8 -159.3 4.0432 2.4 ------ UNKNOWN 97.7328 -37.0831 5.5 50.7 -44.6 2.8720 2.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 36.128000 72.500600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.3516 -40.6039 5.0 57.4 -9.1 0.8460 2.3 8.6 Vela X-1 170.2517 -60.7239 18.0 44.0 25.0 0.1056 0.6 6.3 Cen X-3 186.8659 -62.6897 14.5 43.4 36.7 0.1625 0.8 7.5 GX 301-2 134.8614 -52.0192 2.6 46.5 -4.7 0.5689 4.5 ------ UNKNOWN 24.3082 -64.1305 0.7 9.5 -126.9 1.1281 16.3 ------ UNKNOWN 104.2562 -38.9233 1.9 50.8 -37.5 1.4366 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 101.500600 963.057000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 38.8885 -77.0609 3.5 13.7 37.7 1.8414 3.3 ------ UNKNOWN 2.8810 -45.5846 3.5 22.0 -171.3 1.7992 3.3 ------ UNKNOWN 113.0122 -38.4226 3.6 55.5 -20.4 6.9540 3.2 ------ UNKNOWN 89.7573 -32.4201 5.2 50.6 -44.5 8.7301 2.3 ------ UNKNOWN 89.9619 -32.2667 4.9 50.8 -44.5 10.9870 2.8 ------ UNKNOWN