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: Wed Jun 10 16:47:33 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger557976
======================================================================
Trigger: 00557976 Segment: 000
BAT Trigger Time: 392700152.832 [s; MET]
Trigger Stop: 392700153.856 [s; MET]
UTC: 2013-06-12T03:22:22.167880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 259.804329470416 Dec: 16.7058164669719 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.62
Image Trigger?: NO
Rate S/N Ratio: 14.6287388383278 [ if not an image trigger ]
Image S/N Ratio: 7.62
Analysis Position: [ source = BAT ]
RA: 259.804329470416 Dec: 16.7058164669719 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 259.772856817059 Dec: 16.7248262826293 [deg; J2000]
{ 17h 19m 05.5s , +16d 43' 29.4" }
+/- 1.94332020300138 [arcmin] (estimated 90% radius based on SNR)
+/- 1.19225329512967 [arcmin] (formal 1-sigma fit error)
SNR: 11.7736777086418
Angular difference between the analysis and refined position is 2.138191 arcmin
Partial Coding Fraction: 0.3476562 [ including projection effects ]
Duration
T90: 4 +/- 1.4142135623731
Measured from: -0.832000017166138
to: 3.16799998283386 [s; relative to TRIGTIME]
T50: 1 +/- 1.4142135623731
Measured from: 0.167999982833862
to: 1.16799998283386 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.167999982833862
to: 1.16799998283386 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.832000017166138
to: 3.16799998283386 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.175679 0.237130 0.084053 0.037119
0.024674 0.026236 0.023292 0.021570 [error]
Peak 0.065750 0.095589 0.029215 0.010769
0.013085 0.013613 0.011942 0.010596 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 4.000 -0.832 3.168
T90 4.000 -0.832 3.168
T50 1.000 0.168 1.168
Peak 1.000 0.168 1.168
====== 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: 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 -1.995 -0.254 0.236 - - - 7.62e-03 -1.41e-03 1.39e-03 71.920 57
CPL 0.836 -1.502 2.217 37.262 -5.255 6.789 4.19e-01 -4.19e-01 1.04e+01 59.320 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 -2.077 -0.353 0.326 - - - 1.04e-02 -2.79e-03 2.79e-03 76.910 57
CPL 2.917 -2.714 -2.917 32.355 -4.511 5.923 2.08e+01 -2.08e+01 1.65e+06 64.300 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 6.20e-08 8.44e-08 8.47e-08 1.54e-07 2.81e-07 3.85e-07 erg/cm2
90%_error_low -1.14e-08 -1.25e-08 -2.02e-08 -6.03e-08 -4.87e-08 -8.86e-08 erg/cm2
90%_error_hi 1.16e-08 1.24e-08 2.11e-08 8.16e-08 5.02e-08 1.05e-07 erg/cm2
Peak flux PL 7.48e-01 5.37e-01 2.55e-01 1.71e-01 1.62e+00 1.71e+00 ph/cm2/s
90%_error_low -1.91e-01 -1.14e-01 -8.35e-02 -8.41e-02 -3.38e-01 -3.61e-01 ph/cm2/s
90%_error_hi 1.97e-01 1.14e-01 8.89e-02 1.23e-01 3.38e-01 3.63e-01 ph/cm2/s
Fluence CPL 5.40e-08 1.14e-07 5.81e-08 3.71e-09 2.30e-07 2.30e-07 erg/cm2
90%_error_low -1.32e-08 -1.91e-08 -2.73e-08 -3.43e-09 -3.97e-08 -3.99e-08 erg/cm2
90%_error_hi 1.32e-08 1.96e-08 2.99e-08 1.88e-08 4.55e-08 4.73e-08 erg/cm2
Peak flux CPL 6.55e-01 8.24e-01 8.17e-02 1.05e-04 1.56e+00 1.56e+00 ph/cm2/s
90%_error_low -2.20e-01 -1.80e-01 -8.17e-02 -1.05e-04 -3.20e-01 -3.20e-01 ph/cm2/s
90%_error_hi 2.26e-01 1.82e-01 1.43e-01 9.83e-03 3.23e-01 3.23e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 259.7729 16.7248 0.0164 34.4953 40.9573 0.5544059 11.774 TRIG_00557976 Foreground time interval of the image: -0.832 3.168 (delta_t = 4.000 [sec]) Background time interval of the image: -179.832 -0.832 (delta_t = 179.000 [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 -0.832 sec. to 3.168 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.99473 ( -0.253273 0.236965 ) Norm@50keV : 7.61559E-03 ( -0.00140924 0.00138772 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.92 using 59 PHA bins. # Reduced chi-squared = 1.262 for 57 degrees of freedom # Null hypothesis probability = 8.805556e-02 Photon flux (15-150 keV) in 4 sec: 1.13966 ( -0.164678 0.16467 ) ph/cm2/s Energy fluence (15-150 keV) : 2.80834e-07 ( -4.86728e-08 5.02284e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.832 sec. to 3.168 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.83623 ( -1.54271 2.17585 ) Epeak [keV] : 37.2620 ( -5.17842 6.86578 ) Norm@50keV : 0.419434 ( -0.465653 10.3808 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.32 using 59 PHA bins. # Reduced chi-squared = 1.059 for 56 degrees of freedom # Null hypothesis probability = 3.554148e-01 Photon flux (15-150 keV) in 4 sec: 1.08514 ( -0.160208 0.16161 ) ph/cm2/s Energy fluence (15-150 keV) : 2.29557e-07 ( -3.9742e-08 4.54668e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.168 sec. to 1.168 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.07696 ( -0.356096 0.322966 ) Norm@50keV : 1.04214E-02 ( -0.00279591 0.00277846 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 76.91 using 59 PHA bins. # Reduced chi-squared = 1.349 for 57 degrees of freedom # Null hypothesis probability = 4.058079e-02 Photon flux (15-150 keV) in 1 sec: 1.62135 ( -0.33765 0.33771 ) ph/cm2/s Energy fluence (15-150 keV) : 9.67186e-08 ( -2.36367e-08 2.47517e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.168 sec. to 1.168 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 3.75511 ( -2.74786 -2.95115 ) Epeak [keV] : 31.8437 ( -4.46753 5.96667 ) Norm@50keV : 78.9599 ( -78.8351 1.64615e+06 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.20 using 59 PHA bins. # Reduced chi-squared = 1.146 for 56 degrees of freedom # Null hypothesis probability = 2.112340e-01 Photon flux (15-150 keV) in 1 sec: 1.56104 ( -0.32008 0.32347 ) ph/cm2/s Energy fluence (15-150 keV) : 7.3399e-08 ( -1.6749e-08 1.94848e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 5.189412508516038E-01, IMY = -4.504306793227182E-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: -179.832000 -0.832000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4720 35.2940 8.5 26.4 6.0 -0.2821 -1.4 3.0 Her X-1 218.3437 -2.1840 3.1 30.9 131.0 1.0638 3.7 ------ UNKNOWN 180.0453 -0.6174 2.7 51.3 -177.2 2.1313 4.3 ------ UNKNOWN 169.3428 36.1579 2.4 46.7 -126.3 4.0612 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.832000 3.168000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5480 35.4024 3.0 26.5 5.8 0.1172 3.9 5.7 Her X-1 259.7729 16.7247 1.0 34.5 41.0 0.5548 11.7 ------ UNKNOWN 248.3897 23.2731 2.2 22.1 36.6 0.1603 5.3 ------ UNKNOWN 288.2433 35.3646 2.0 53.8 4.3 0.6206 5.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 73.468590 662.268000 840.168000 902.318400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9039 -15.6125 3.7 35.5 116.5 0.7780 3.2 4.7 Sco X-1 254.3262 35.4844 23.1 19.4 -102.3 0.0548 0.5 10.7 Her X-1 268.4811 -1.5134 4.3 20.1 65.3 0.3182 2.7 7.7 SW J1753.5-0127 273.9976 -14.0914 5.4 33.8 66.0 0.4781 2.1 3.3 GX 17+2 288.7487 10.9449 4.6 28.7 9.1 0.2800 2.5 2.9 GRS 1915+105 299.6669 35.3128 4.4 40.0 -34.3 0.4073 2.6 7.7 Cyg X-1 308.2251 40.7416 0.0 48.0 -39.0 -0.4817 -1.7 13.7 Cyg X-3 316.2997 10.2797 2.3 55.1 0.3 2.1394 5.1 ------ UNKNOWN 248.6613 19.6394 2.3 11.0 -161.6 0.4501 5.0 ------ UNKNOWN 197.0547 25.0508 3.9 58.7 -159.2 1.8643 3.0 ------ UNKNOWN 271.1049 47.8037 3.0 32.4 -74.5 0.6352 3.8 ------ UNKNOWN 306.9921 47.5149 2.1 49.3 -47.9 2.7193 5.5 ------ UNKNOWN