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 02:18:33 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger557354
======================================================================
Trigger: 00557354 Segment: 000
BAT Trigger Time: 392021677.632 [s; MET]
Trigger Stop: 392021681.728 [s; MET]
UTC: 2013-06-04T06:54:26.998160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.080442177307 Dec: 68.2100394725204 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.99
Image Trigger?: NO
Rate S/N Ratio: 12.369316876853 [ if not an image trigger ]
Image S/N Ratio: 7.99
Analysis Position: [ source = BAT ]
RA: 250.080442177307 Dec: 68.2100394725204 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 250.166094294742 Dec: 68.224703294494 [deg; J2000]
{ 16h 40m 39.9s , +68d 13' 28.9" }
+/- 1.11626650385319 [arcmin] (estimated 90% radius based on SNR)
+/- 0.499931470338852 [arcmin] (formal 1-sigma fit error)
SNR: 25.9943243081518
Angular difference between the analysis and refined position is 2.100232 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 76.2839999198914 +/- 29.7594602090569
Measured from: 1.43999999761581
to: 77.7239999175072 [s; relative to TRIGTIME]
T50: 22.3879999518394 +/- 4.0223793880458
Measured from: 8.74399995803833
to: 31.1319999098778 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 14.3919999599457
to: 15.3919999599457 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.444000005722046
to: 95.7679999470711 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.797853 0.965488 0.605254 0.150162
0.063199 0.064999 0.057662 0.051240 [error]
Peak 0.018830 0.040178 0.022490 0.017232
0.007328 0.007340 0.006754 0.005644 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 96.212 -0.444 95.768
T90 76.284 1.440 77.724
T50 22.388 8.744 31.132
Peak 1.000 14.392 15.392
====== 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 -1.628 -0.145 0.143 - - - 1.72e-03 -1.39e-04 1.38e-04 56.410 57
CPL -1.635 -0.138 0.154 9999.360 -9999.350 -9999.360 1.71e-03 -8.98e-04 -5.91e-04 56.440 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 -1.318 -0.410 0.427 - - - 6.40e-03 -1.44e-03 1.43e-03 58.410 57
CPL -1.325 -0.402 0.440 9999.360 -9999.360 -9999.360 6.42e-03 N/A N/A 58.420 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 2.38e-07 4.05e-07 5.24e-07 1.37e-06 1.54e-06 2.53e-06 erg/cm2
90%_error_low -3.04e-08 -3.14e-08 -5.78e-08 -2.98e-07 -1.34e-07 -3.49e-07 erg/cm2
90%_error_hi 3.14e-08 3.13e-08 5.77e-08 3.52e-07 1.35e-07 3.92e-07 erg/cm2
Peak flux PL 2.21e-01 2.48e-01 1.99e-01 2.65e-01 7.66e-01 9.34e-01 ph/cm2/s
90%_error_low -8.94e-02 -6.52e-02 -5.50e-02 -1.27e-01 -1.76e-01 -2.15e-01 ph/cm2/s
90%_error_hi 9.97e-02 6.26e-02 5.35e-02 1.91e-01 1.77e-01 2.21e-01 ph/cm2/s
Fluence CPL 2.42e-07 3.99e-07 5.20e-07 1.49e-06 1.57e-06 2.52e-06 erg/cm2
90%_error_low -3.46e-08 -2.50e-08 -5.45e-08 -6.46e-07 -1.63e-07 -5.01e-07 erg/cm2
90%_error_hi 2.73e-08 3.81e-08 6.10e-08 1.01e-07 1.06e-07 3.84e-07 erg/cm2
Peak flux CPL 2.22e-01 2.45e-01 1.97e-01 3.20e-01 7.68e-01 9.40e-01 ph/cm2/s
90%_error_low N/A -7.06e-02 -5.37e-02 N/A -1.71e-01 -2.79e-01 ph/cm2/s
90%_error_hi N/A 7.57e-02 5.57e-02 N/A 1.76e-01 2.14e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 250.1661 68.2247 0.0074 30.8365 -168.0504 2.2375506 25.994 TRIG_00557354 Foreground time interval of the image: -0.444 36.469 (delta_t = 36.913 [sec]) Background time interval of the image: -330.931 -315.946 (delta_t = 14.986 [sec]) -239.632 -0.444 (delta_t = 239.188 [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 -0.444 sec. to 95.768 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62848 ( -0.144571 0.142904 ) Norm@50keV : 1.71904E-03 ( -0.000139227 0.000137782 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.41 using 59 PHA bins. # Reduced chi-squared = 0.9896 for 57 degrees of freedom # Null hypothesis probability = 4.973221e-01 Photon flux (15-150 keV) in 96.21 sec: 0.222905 ( -0.017152 0.017191 ) ph/cm2/s Energy fluence (15-150 keV) : 1.54188e-06 ( -1.33921e-07 1.3534e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.444 sec. to 95.768 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.12844 ( -0.138374 0.153514 ) Epeak [keV] : 50.0426 ( -9999.35 -9999.36 ) Norm@50keV : 9.25714E-04 ( -0.000110235 0.000197258 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.86 using 59 PHA bins. # Reduced chi-squared = 0.9619 for 56 degrees of freedom # Null hypothesis probability = 5.561166e-01 Photon flux (15-150 keV) in 96.21 sec: 0.222899 ( -0.017174 0.017173 ) ph/cm2/s Energy fluence (15-150 keV) : 1.57072e-06 ( -1.63218e-07 1.05995e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 14.392 sec. to 15.392 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.31784 ( -0.409536 0.427064 ) Norm@50keV : 6.40191E-03 ( -0.00143698 0.00143343 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.41 using 59 PHA bins. # Reduced chi-squared = 1.025 for 57 degrees of freedom # Null hypothesis probability = 4.233681e-01 Photon flux (15-150 keV) in 1 sec: 0.766341 ( -0.176313 0.176994 ) ph/cm2/s Energy fluence (15-150 keV) : 6.29985e-08 ( -1.56877e-08 1.59602e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 14.392 sec. to 15.392 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32496 ( -0.402516 0.439052 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 6.42261E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.42 using 59 PHA bins. # Reduced chi-squared = 1.043 for 56 degrees of freedom # Null hypothesis probability = 3.866569e-01 Photon flux (15-150 keV) in 1 sec: 0.768335 ( -0.17073 0.176037 ) ph/cm2/s Energy fluence (15-150 keV) : 6.29492e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 76.284 sec. Hardness ratio (energy fluence ratio) = 1.2937192786
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.430982e-07 S(50-150 keV) = 8.98767e-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 = -5.840468575128441E-01, IMY = 1.236059627389259E-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: -330.931340 -315.945500 -239.632000 -0.444000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6033 35.4564 4.8 40.7 136.4 1.4890 2.4 9.9 Her X-1 299.6290 35.2064 1.7 18.3 70.9 1.7270 6.7 1.9 Cyg X-1 308.0904 40.9532 1.0 11.6 48.0 2.7311 11.7 0.9 Cyg X-3 326.1694 38.3489 7.3 19.1 0.2 0.3194 1.6 1.6 Cyg X-2 278.1197 48.4392 2.2 19.1 138.9 1.1697 5.3 ------ UNKNOWN 351.1074 42.2062 2.9 30.6 -38.3 1.0776 3.9 ------ UNKNOWN 179.5616 74.9184 2.4 48.0 -146.4 2.5340 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.444000 36.468590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3079 35.2292 0.0 41.0 136.4 0.5892 2.5 10.0 Her X-1 299.6766 35.3340 3.3 18.2 70.9 -0.3213 -3.5 9.0 Cyg X-1 308.0717 41.0419 5.8 11.5 48.0 -0.1586 -2.0 5.6 Cyg X-3 325.9866 38.4012 21.5 19.0 0.5 -0.0427 -0.5 9.9 Cyg X-2 219.7454 60.3890 2.2 45.5 -174.3 0.7381 5.2 ------ UNKNOWN 250.1662 68.2247 0.4 30.8 -168.1 2.2372 26.0 ------ UNKNOWN 352.7754 26.7998 2.5 42.2 -20.7 0.5280 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 88.468600 238.460700 239.368000 450.568620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6122 35.3444 5.9 33.0 85.6 1.1820 1.9 7.6 Her X-1 299.6877 35.1268 6.6 43.0 26.5 0.9544 1.8 6.6 Cyg X-1 308.1110 40.9460 1.4 40.8 13.7 3.6155 8.2 0.4 Cyg X-3 326.0442 38.3572 7.4 49.7 -1.6 0.8394 1.6 6.4 Cyg X-2 176.4744 32.3259 4.5 54.2 -179.2 2.7179 2.6 ------ UNKNOWN 140.5822 50.7846 2.9 50.1 -138.5 4.8375 4.0 ------ UNKNOWN 23.8928 62.8774 3.1 44.8 -59.8 4.9401 3.8 ------ UNKNOWN 71.4606 70.9739 3.8 40.8 -88.3 4.2438 3.1 ------ UNKNOWN