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 02:33:24 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger557274
======================================================================
Trigger: 00557274 Segment: 000
BAT Trigger Time: 391931983.296 [s; MET]
Trigger Stop: 391931991.488 [s; MET]
UTC: 2013-06-03T05:59:32.666180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 86.9541212664379 Dec: 82.9339151120058 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.2
Image Trigger?: NO
Rate S/N Ratio: 9 [ if not an image trigger ]
Image S/N Ratio: 11.2
Analysis Position: [ source = BAT ]
RA: 86.9541212664379 Dec: 82.9339151120058 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 86.9304984442012 Dec: 82.9109451215811 [deg; J2000]
{ 05h 47m 43.3s , +82d 54' 39.4" }
+/- 1.25997412600766 [arcmin] (estimated 90% radius based on SNR)
+/- 0.382512649525744 [arcmin] (formal 1-sigma fit error)
SNR: 21.8647556065317
Angular difference between the analysis and refined position is 1.389220 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 69.1279999613762 +/- 23.4262938267232
Measured from: -8.92800003290176
to: 60.1999999284744 [s; relative to TRIGTIME]
T50: 32.4239999055862 +/- 4.02004972002492
Measured from: 5.68400001525879
to: 38.107999920845 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.2680000066757
to: 12.2680000066757 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.811999976635
to: 104.980000019073 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.271948 1.296522 0.817463 0.102862
0.063729 0.066677 0.059953 0.054494 [error]
Peak 0.029284 0.030868 0.026124 0.011178
0.005958 0.006277 0.005551 0.004993 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 125.792 -20.812 104.980
T90 69.128 -8.928 60.200
T50 32.424 5.684 38.108
Peak 1.000 11.268 12.268
====== 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 -1.835 -0.122 0.119 - - - 1.64e-03 -1.15e-04 1.14e-04 40.940 57
CPL -1.705 -0.246 0.469 104.195 N/A N/A 1.93e-03 N/A N/A 40.680 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 -1.461 -0.341 0.335 - - - 6.06e-03 -1.23e-03 1.20e-03 55.400 57
CPL -1.255 -1.397 1.432 171.420 -171.420 -171.420 7.80e-03 -7.80e-03 3.65e-02 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 3.62e-07 5.43e-07 6.09e-07 1.29e-06 1.90e-06 2.81e-06 erg/cm2
90%_error_low -3.51e-08 -3.25e-08 -5.96e-08 -2.48e-07 -1.34e-07 -3.04e-07 erg/cm2
90%_error_hi 3.62e-08 3.25e-08 6.00e-08 2.86e-07 1.36e-07 3.35e-07 erg/cm2
Peak flux PL 2.40e-01 2.47e-01 1.80e-01 2.10e-01 7.49e-01 8.77e-01 ph/cm2/s
90%_error_low -7.30e-02 -4.93e-02 -4.63e-02 -9.18e-02 -1.42e-01 -1.74e-01 ph/cm2/s
90%_error_hi 7.82e-02 4.86e-02 4.59e-02 1.29e-01 1.42e-01 1.78e-01 ph/cm2/s
Fluence CPL 3.68e-07 5.11e-07 6.09e-07 1.27e-06 1.76e-06 2.69e-06 erg/cm2
90%_error_low -4.04e-08 -5.45e-08 -6.10e-08 -7.72e-07 -1.78e-07 -7.90e-07 erg/cm2
90%_error_hi 2.44e-08 4.38e-08 6.13e-08 4.03e-07 1.37e-07 2.09e-07 erg/cm2
Peak flux CPL 2.33e-01 2.53e-01 1.82e-01 1.59e-01 7.43e-01 8.28e-01 ph/cm2/s
90%_error_low -8.36e-02 -5.43e-02 -4.80e-02 -1.59e-01 -1.47e-01 -2.08e-01 ph/cm2/s
90%_error_hi 7.98e-02 6.17e-02 5.01e-02 7.67e-02 1.46e-01 2.22e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 86.9305 82.9109 0.0088 18.6644 -22.1108 3.4578330 21.865 TRIG_00557274 Foreground time interval of the image: -20.812 104.980 (delta_t = 125.792 [sec]) Background time interval of the image: -590.195 -572.306 (delta_t = 17.890 [sec]) -239.296 -20.812 (delta_t = 218.484 [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 -20.812 sec. to 104.980 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.83538 ( -0.122132 0.119303 ) Norm@50keV : 1.64484E-03 ( -0.000115207 0.000113692 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.94 using 59 PHA bins. # Reduced chi-squared = 0.7182 for 57 degrees of freedom # Null hypothesis probability = 9.463526e-01 Photon flux (15-150 keV) in 125.8 sec: 0.229852 ( -0.014024 0.014051 ) ph/cm2/s Energy fluence (15-150 keV) : 1.9034e-06 ( -1.33864e-07 1.35518e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.812 sec. to 104.980 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.70508 ( -0.246069 0.469274 ) Epeak [keV] : 104.195 ( ) Norm@50keV : 1.93049E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.68 using 59 PHA bins. # Reduced chi-squared = 0.7264 for 56 degrees of freedom # Null hypothesis probability = 9.384025e-01 Photon flux (15-150 keV) in 125.8 sec: 0.227982 ( -0.01527 0.015181 ) ph/cm2/s Energy fluence (15-150 keV) : 1.76109e-06 ( -1.77796e-07 1.37501e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 11.268 sec. to 12.268 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.46054 ( -0.341095 0.335075 ) Norm@50keV : 6.06180E-03 ( -0.00122674 0.00120385 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.40 using 59 PHA bins. # Reduced chi-squared = 0.9719 for 57 degrees of freedom # Null hypothesis probability = 5.353561e-01 Photon flux (15-150 keV) in 1 sec: 0.749022 ( -0.142415 0.142488 ) ph/cm2/s Energy fluence (15-150 keV) : 5.79029e-08 ( -1.29032e-08 1.3261e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.268 sec. to 12.268 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25468 ( -1.39582 1.43315 ) Epeak [keV] : 171.420 ( -172.222 -172.222 ) Norm@50keV : 7.80297E-03 ( -0.00779484 0.0364659 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.31 using 59 PHA bins. # Reduced chi-squared = 0.9876 for 56 degrees of freedom # Null hypothesis probability = 5.010487e-01 Photon flux (15-150 keV) in 1 sec: 0.743026 ( -0.146573 0.146018 ) ph/cm2/s Energy fluence (15-150 keV) : 5.67336e-08 ( -1.45027e-08 1.41425e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 69.128 sec. Hardness ratio (energy fluence ratio) = 1.12090816916
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.052488e-07 S(50-150 keV) = 9.981229e-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 = 3.129479552960023E-01, IMY = 1.271434766404723E-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: -590.195400 -572.305500 -239.296000 -20.812000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 196.9250 37.2128 2.4 40.8 113.9 3.7648 4.8 ------ UNKNOWN 169.7399 61.6142 2.1 11.2 119.8 1.0585 5.7 ------ UNKNOWN 168.5712 61.8390 2.6 10.7 121.3 0.8967 4.7 ------ UNKNOWN 346.4959 83.0952 2.3 27.6 -6.5 1.0157 5.1 ------ UNKNOWN 111.7924 23.3483 2.6 51.0 -135.9 4.3694 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -20.812000 104.980000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 86.9305 82.9109 0.5 18.7 -22.1 3.4582 21.9 ------ UNKNOWN 121.8799 59.1287 2.2 15.4 -118.7 0.7968 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 344.804590 496.904600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.1432 -60.5149 173.0 43.8 -155.5 -0.0201 -0.1 8.2 Cen X-3 186.4523 -62.6909 5.8 40.8 -166.6 0.4822 2.0 7.4 GX 301-2 244.9570 -15.6270 1.2 38.6 86.1 7.6527 9.9 1.5 Sco X-1 235.8238 13.5614 2.0 48.1 43.0 4.8775 5.7 ------ UNKNOWN 227.9613 5.5757 2.4 37.1 41.2 1.5574 4.9 ------ UNKNOWN 223.5443 -62.8885 2.2 41.1 167.8 1.4637 5.2 ------ UNKNOWN 218.8327 -77.4069 3.1 54.1 176.9 2.4893 3.8 ------ UNKNOWN 141.9307 -70.7246 3.6 58.8 -159.3 3.2651 3.2 ------ UNKNOWN 159.5224 -24.0094 3.5 41.2 -99.2 2.8985 3.3 ------ UNKNOWN