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 Sep 10 18:52:12 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger557845
======================================================================
Trigger: 00557845 Segment: 000
BAT Trigger Time: 392526744 [s; MET]
Trigger Stop: 392526808 [s; MET]
UTC: 2013-06-10T03:12:13.343620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 224.415905357673 Dec: 28.1911682712337 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.34
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 19.34
Analysis Position: [ source = BAT ]
RA: 224.415905357673 Dec: 28.1911682712337 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 224.408062834987 Dec: 28.190439711407 [deg; J2000]
{ 14h 57m 37.9s , +28d 11' 25.6" }
+/- 2.5037821965006 [arcmin] (estimated 90% radius based on SNR)
+/- 1.4812221833555 [arcmin] (formal 1-sigma fit error)
SNR: 8.1977513507944
Angular difference between the analysis and refined position is 0.417032 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 47.7239999175072 +/- 10.7398658831923
Measured from: -3.96399998664856
to: 43.7599999308586 [s; relative to TRIGTIME]
T50: 13.4799999594688 +/- 2.21979819147243
Measured from: 1.53200000524521
to: 15.0119999647141 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.53200000524521
to: 5.53200000524521 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.04000002145767
to: 62.4399999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.860801 1.382702 1.181716 0.301173
0.050651 0.053172 0.048566 0.042188 [error]
Peak 0.039184 0.085940 0.075236 0.006305
0.006811 0.007331 0.007059 0.005734 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 69.480 -7.040 62.440
T90 47.724 -3.964 43.760
T50 13.480 1.532 15.012
Peak 1.000 4.532 5.532
====== 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 -1.272 -0.077 0.077 - - - 3.67e-03 -1.56e-04 1.56e-04 59.610 57
CPL -1.010 -0.283 0.305 201.993 -80.629 -201.993 4.88e-03 -1.13e-03 1.86e-03 57.120 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 -1.192 -0.161 0.162 - - - 1.47e-02 -1.44e-03 1.44e-03 75.220 57
CPL -0.206 -0.718 0.877 93.784 -23.286 108.394 4.49e-02 -2.46e-02 7.29e-02 69.390 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 2.63e-07 5.55e-07 9.19e-07 3.45e-06 2.53e-06 5.19e-06 erg/cm2
90%_error_low -2.14e-08 -2.71e-08 -4.75e-08 -3.88e-07 -1.19e-07 -4.18e-07 erg/cm2
90%_error_hi 2.20e-08 2.69e-08 4.74e-08 4.22e-07 1.19e-07 4.47e-07 erg/cm2
Peak flux PL 4.51e-01 5.45e-01 4.77e-01 7.16e-01 1.72e+00 2.19e+00 ph/cm2/s
90%_error_low -7.77e-02 -6.05e-02 -5.49e-02 -1.56e-01 -1.71e-01 -2.29e-01 ph/cm2/s
90%_error_hi 8.18e-02 5.99e-02 5.45e-02 1.82e-01 1.71e-01 2.34e-01 ph/cm2/s
Fluence CPL 2.49e-07 5.67e-07 9.39e-07 2.37e-06 2.49e-06 4.12e-06 erg/cm2
90%_error_low -2.60e-08 -3.02e-08 -5.25e-08 -7.63e-07 -1.31e-07 -7.66e-07 erg/cm2
90%_error_hi 2.65e-08 3.06e-08 5.31e-08 1.19e-06 1.30e-07 1.04e-06 erg/cm2
Peak flux CPL 3.72e-01 5.92e-01 5.18e-01 2.76e-01 1.66e+00 1.76e+00 ph/cm2/s
90%_error_low -9.35e-02 -7.24e-02 -6.49e-02 -1.34e-01 -1.78e-01 -2.27e-01 ph/cm2/s
90%_error_hi 9.79e-02 7.48e-02 6.64e-02 2.61e-01 1.78e-01 2.95e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 224.4081 28.1904 0.0235 21.8715 -167.1336 2.8993747 8.198 TRIG_00557845 Foreground time interval of the image: -7.040 62.440 (delta_t = 69.480 [sec]) Background time interval of the image: -12.099 -7.040 (delta_t = 5.059 [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 -7.040 sec. to 62.440 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27243 ( -0.076613 0.0770147 ) Norm@50keV : 3.66508E-03 ( -0.000155595 0.000155594 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.61 using 59 PHA bins. # Reduced chi-squared = 1.046 for 57 degrees of freedom # Null hypothesis probability = 3.809974e-01 Photon flux (15-150 keV) in 69.48 sec: 0.435115 ( -0.01926 0.019287 ) ph/cm2/s Energy fluence (15-150 keV) : 2.53407e-06 ( -1.18782e-07 1.19185e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.040 sec. to 62.440 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00996 ( -0.283088 0.305325 ) Epeak [keV] : 201.993 ( -80.6298 -201.993 ) Norm@50keV : 4.88108E-03 ( -0.00113393 0.00185981 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.12 using 59 PHA bins. # Reduced chi-squared = 1.020 for 56 degrees of freedom # Null hypothesis probability = 4.331853e-01 Photon flux (15-150 keV) in 69.48 sec: 0.429088 ( -0.020305 0.02031 ) ph/cm2/s Energy fluence (15-150 keV) : 2.48656e-06 ( -1.3054e-07 1.2993e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.532 sec. to 5.532 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.19219 ( -0.160961 0.162329 ) Norm@50keV : 1.46995E-02 ( -0.00143963 0.00143909 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 75.22 using 59 PHA bins. # Reduced chi-squared = 1.320 for 57 degrees of freedom # Null hypothesis probability = 5.329731e-02 Photon flux (15-150 keV) in 1 sec: 1.72356 ( -0.17078 0.17094 ) ph/cm2/s Energy fluence (15-150 keV) : 1.49479e-07 ( -1.64366e-08 1.65829e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.532 sec. to 5.532 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.205586 ( -0.718091 0.876702 ) Epeak [keV] : 93.7836 ( -23.286 108.394 ) Norm@50keV : 4.48586E-02 ( -0.0245606 0.0729328 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.39 using 59 PHA bins. # Reduced chi-squared = 1.239 for 56 degrees of freedom # Null hypothesis probability = 1.078284e-01 Photon flux (15-150 keV) in 1 sec: 1.66013 ( -0.17814 0.17763 ) ph/cm2/s Energy fluence (15-150 keV) : 1.39107e-07 ( -1.84257e-08 1.84653e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 47.724 sec. Hardness ratio (energy fluence ratio) = 1.65588483612
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.180852e-07 S(50-150 keV) = 1.7159796e-06
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 = -3.913418130255893E-01, IMY = 8.938769030632743E-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: -12.099400 -7.040000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2499 35.4702 0.0 7.0 -45.2 -0.0449 -1.9 12.7 Her X-1 268.4542 -1.2895 5.8 36.0 66.9 0.1226 2.0 11.1 SW J1753.5-0127 288.7745 10.8340 5.3 41.2 29.5 0.1155 2.2 6.8 GRS 1915+105 299.7528 35.1221 11.1 42.4 -10.3 -0.0403 -1.0 9.3 Cyg X-1 307.9882 40.9332 5.9 48.2 -19.5 0.0956 1.9 5.7 Cyg X-3 202.6865 24.3084 2.1 41.7 -165.3 0.2005 5.6 ------ UNKNOWN 317.3350 30.8327 1.9 57.7 -9.1 0.7994 6.0 ------ UNKNOWN 193.3322 37.5615 2.7 46.6 -144.1 0.2317 4.3 ------ UNKNOWN 319.2811 46.9144 2.3 55.5 -28.3 0.5200 5.0 ------ UNKNOWN 195.6775 53.3195 2.1 45.2 -122.1 0.5540 5.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -7.040000 62.440000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6505 35.2972 1776.7 7.1 -42.2 -0.0021 -0.0 9.8 Her X-1 268.3024 -1.5007 32.6 36.1 67.3 0.3204 0.4 4.9 SW J1753.5-0127 288.7356 10.8183 11.1 41.2 29.6 -0.7991 -1.0 8.5 GRS 1915+105 299.7636 35.1549 14.2 42.4 -10.3 0.4426 0.8 8.9 Cyg X-1 308.0131 40.9610 4.6 48.2 -19.5 -1.7246 -2.5 4.4 Cyg X-3 209.8808 2.5001 2.3 46.3 162.2 4.8224 5.1 ------ UNKNOWN 314.8740 24.5758 2.6 57.7 -1.2 9.5361 4.5 ------ UNKNOWN 224.4081 28.1905 1.4 21.9 -167.1 2.8991 8.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 119.100590 603.050000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4511 35.3801 6.2 26.4 13.0 0.3531 1.9 2.3 Her X-1 209.2014 4.0736 2.4 28.1 160.1 1.0396 4.8 ------ UNKNOWN 183.7669 -4.9342 2.5 51.3 -177.3 2.1944 4.7 ------ UNKNOWN 167.1730 4.2496 3.8 59.3 -156.3 4.1489 3.3 ------ UNKNOWN 167.0527 4.1923 4.1 59.4 -156.3 4.5403 3.5 ------ UNKNOWN