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: Mon Jan 13 06:09:51 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger516997
======================================================================
Trigger: 00516997 Segment: 000
BAT Trigger Time: 352669058.068 [s; MET]
Trigger Stop: 352669058.132 [s; MET]
UTC: 2012-03-05T19:37:30.107140 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 47.5464362623518 Dec: 28.4934691193433 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.18
Image Trigger?: NO
Rate S/N Ratio: 186.566342087741 [ if not an image trigger ]
Image S/N Ratio: 18.18
Analysis Position: [ source = BAT ]
RA: 47.5464362623518 Dec: 28.4934691193433 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 47.5489609882108 Dec: 28.494791756286 [deg; J2000]
{ 03h 10m 11.8s , +28d 29' 41.3" }
+/- 0.927685758260998 [arcmin] (estimated 90% radius based on SNR)
+/- 0.269958629434275 [arcmin] (formal 1-sigma fit error)
SNR: 33.8601235139361
Angular difference between the analysis and refined position is 0.154991 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 0.0999999046325684 +/- 0.0120000243186951
Measured from: 0.00400000810623169
to: 0.1039999127388 [s; relative to TRIGTIME]
T50: 0.0279999375343323 +/- 0.00565686571343518
Measured from: 0.0199999809265137
to: 0.0479999184608459 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.434000015258789
to: 0.565999984741211 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.12799996137619 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.052298 0.097002 0.099583 0.033456
0.003540 0.004716 0.005186 0.004097 [error]
Peak 0.054310 0.103196 0.103130 0.031328
0.005824 0.006688 0.006726 0.005624 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.128 0.000 0.128
T90 0.100 0.004 0.104
T50 0.028 0.020 0.048
Peak 1.000 -0.434 0.566
====== 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 -0.992 -0.089 0.090 - - - 1.43e-01 -7.49e-03 7.49e-03 64.320 57
CPL -0.675 -0.340 0.372 222.886 -92.581 -222.886 2.04e-01 -5.55e-02 1.01e-01 61.830 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 -1.039 -0.120 0.121 - - - 1.92e-02 -1.31e-03 1.31e-03 52.630 57
CPL -0.838 -0.259 0.490 313.166 -313.166 -313.166 2.39e-02 -5.74e-03 1.62e-02 52.050 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 1.46e-08 3.66e-08 7.36e-08 3.71e-07 1.99e-07 4.96e-07 erg/cm2
90%_error_low -1.38e-09 -2.13e-09 -4.69e-09 -4.99e-08 -1.23e-08 -5.34e-08 erg/cm2
90%_error_hi 1.42e-09 2.12e-09 4.67e-09 5.49e-08 1.24e-08 5.79e-08 erg/cm2
Peak flux PL 5.08e-01 6.73e-01 6.55e-01 1.14e+00 2.21e+00 2.98e+00 ph/cm2/s
90%_error_low -6.68e-02 -5.48e-02 -5.20e-02 -1.84e-01 -1.53e-01 -2.31e-01 ph/cm2/s
90%_error_hi 6.96e-02 5.43e-02 5.16e-02 2.06e-01 1.53e-01 2.38e-01 ph/cm2/s
Fluence CPL 1.37e-08 3.78e-08 7.58e-08 2.30e-07 1.94e-07 3.58e-07 erg/cm2
90%_error_low -1.65e-09 -2.52e-09 -5.31e-09 -8.85e-08 -1.35e-08 -8.82e-08 erg/cm2
90%_error_hi 1.67e-09 2.57e-09 5.40e-09 1.53e-07 1.34e-08 1.53e-07 erg/cm2
Peak flux CPL 4.86e-01 6.84e-01 6.69e-01 9.01e-01 2.19e+00 2.74e+00 ph/cm2/s
90%_error_low -8.15e-02 -5.94e-02 -6.03e-02 -3.57e-01 -1.58e-01 -3.90e-01 ph/cm2/s
90%_error_hi 7.85e-02 6.11e-02 6.16e-02 2.97e-01 1.57e-01 3.61e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 47.5490 28.4948 0.0057 11.3491 109.5526 0.2940537 33.860 TRIG_00516997 Foreground time interval of the image: 0.000 0.128 (delta_t = 0.128 [sec]) Background time interval of the image: -657.567 -640.191 (delta_t = 17.377 [sec]) -239.068 0.000 (delta_t = 239.068 [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 0.000 sec. to 0.128 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.992083 ( -0.0891914 0.089597 ) Norm@50keV : 0.143079 ( -0.00748925 0.00748869 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.32 using 59 PHA bins. # Reduced chi-squared = 1.128 for 57 degrees of freedom # Null hypothesis probability = 2.358180e-01 Photon flux (15-150 keV) in 0.128 sec: 16.4658 ( -0.8623 0.8624 ) ph/cm2/s Energy fluence (15-150 keV) : 1.98619e-07 ( -1.23158e-08 1.23945e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.128 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.675106 ( -0.339679 0.372193 ) Epeak [keV] : 222.886 ( -92.5828 -222.887 ) Norm@50keV : 0.203659 ( -0.0554964 0.10073 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.83 using 59 PHA bins. # Reduced chi-squared = 1.104 for 56 degrees of freedom # Null hypothesis probability = 2.758933e-01 Photon flux (15-150 keV) in 0.128 sec: 16.2972 ( -0.8846 0.8823 ) ph/cm2/s Energy fluence (15-150 keV) : 1.94173e-07 ( -1.34852e-08 1.33896e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.434 sec. to 0.566 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03872 ( -0.119932 0.12135 ) Norm@50keV : 1.91597E-02 ( -0.00130952 0.00130942 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.63 using 59 PHA bins. # Reduced chi-squared = 0.9234 for 57 degrees of freedom # Null hypothesis probability = 6.395168e-01 Photon flux (15-150 keV) in 1 sec: 2.21107 ( -0.15266 0.15272 ) ph/cm2/s Energy fluence (15-150 keV) : 2.04433e-07 ( -1.60464e-08 1.61744e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.434 sec. to 0.566 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.838235 ( -0.259232 0.489827 ) Epeak [keV] : 313.166 ( -313.178 -313.178 ) Norm@50keV : 2.38624E-02 ( -0.00574322 0.0161506 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.05 using 59 PHA bins. # Reduced chi-squared = 0.9295 for 56 degrees of freedom # Null hypothesis probability = 6.250831e-01 Photon flux (15-150 keV) in 1 sec: 2.19372 ( -0.15766 0.15739 ) ph/cm2/s Energy fluence (15-150 keV) : 2.01572e-07 ( -1.75075e-08 1.73402e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.0999999 sec. Hardness ratio (energy fluence ratio) = 2.01099047663
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.11536e-08 S(50-150 keV) = 1.4746396e-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 = -6.717245590820499E-02, IMY = -1.891371247912358E-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: -657.567400 -640.190500 -239.068000 0.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.1660 38.2232 4.6 58.8 -20.7 3.0771 2.5 5.9 Cyg X-2 10.3249 66.6781 2.7 44.2 24.5 1.5516 4.3 ------ UNKNOWN 75.1851 -4.5296 2.9 48.9 160.4 2.9520 4.0 ------ UNKNOWN 10.5027 47.4878 2.4 29.6 3.4 0.9683 4.9 ------ UNKNOWN 338.3605 46.8582 2.5 49.5 -10.5 1.7101 4.6 ------ UNKNOWN 49.6163 -24.2463 2.9 51.5 -158.3 2.0616 4.0 ------ UNKNOWN 31.7743 -12.1515 3.1 37.6 -135.9 1.2198 3.7 ------ UNKNOWN 35.8994 -27.8760 3.3 53.2 -142.2 3.4967 3.5 ------ UNKNOWN 354.4565 7.8306 2.8 42.7 -68.5 3.9896 4.1 575.1 UNKNOWN 25.1472 -21.5895 3.0 48.0 -128.8 3.1938 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.000000 0.128000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.1591 38.3321 5.4 58.8 -20.5 0.1130 2.1 0.9 Cyg X-2 47.5490 28.4948 0.3 11.3 109.6 0.2941 33.9 ------ UNKNOWN 13.0763 -10.2408 2.1 41.7 -107.5 0.1732 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 51.832600 662.964900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6409 22.0128 0.5 33.2 113.3 24.7545 24.3 0.4 Crab 36.2541 72.7945 2.9 44.7 15.7 3.9846 4.0 ------ UNKNOWN 51.3681 -25.4206 3.0 54.0 -163.9 6.3668 3.8 ------ UNKNOWN 337.9465 54.9533 2.9 55.5 -20.4 7.2141 3.9 ------ UNKNOWN 24.5315 -14.0155 2.5 48.0 -128.9 10.8692 4.6 ------ UNKNOWN 349.5269 33.7644 3.4 49.3 -48.1 10.1321 3.4 ------ UNKNOWN