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: Sat Oct 4 22:05:42 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger602278
======================================================================
Trigger: 00602278 Segment: 000
BAT Trigger Time: 425122576.888 [s; MET]
Trigger Stop: 425122576.952 [s; MET]
UTC: 2014-06-22T09:36:04.716920 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 317.1522269814 Dec: -14.4303092061331 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.79
Image Trigger?: NO
Rate S/N Ratio: 12.4498995979887 [ if not an image trigger ]
Image S/N Ratio: 6.79
Analysis Position: [ source = BAT ]
RA: 317.1522269814 Dec: -14.4303092061331 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 317.152806979276 Dec: -14.4123201830962 [deg; J2000]
{ 21h 08m 36.7s , -14d 24' 44.4" }
+/- 2.48405196385572 [arcmin] (estimated 90% radius based on SNR)
+/- 1.30787501222567 [arcmin] (formal 1-sigma fit error)
SNR: 8.29092769520345
Angular difference between the analysis and refined position is 1.079867 arcmin
Partial Coding Fraction: 0.5703125 [ including projection effects ]
Duration
T90: 0.131999969482422 +/- 0.035777106832332
Measured from: -0.0120000243186951
to: 0.119999945163727 [s; relative to TRIGTIME]
T50: 0.0519999861717224 +/- 0.0341760075028058
Measured from: 0.0119999647140503
to: 0.0639999508857727 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.446000039577484
to: 0.553999960422516 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0239999890327454
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 0.011552 0.029349 0.016302 0.002177
0.004132 0.004481 0.003791 0.002694 [error]
Peak 0.016318 0.039550 0.010203 0.007173
0.008937 0.008979 0.007791 0.006137 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.152 -0.024 0.128
T90 0.132 -0.012 0.120
T50 0.052 0.012 0.064
Peak 1.000 -0.446 0.554
====== 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 -3.080 -0.326 0.262 - - - 6.97e-03 -2.23e-03 2.17e-03 64.670 57
CPL 1.230 -1.308 2.344 44.238 -7.709 6.841 1.25e+00 -1.25e+00 2.47e+01 35.950 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 -1.915 -0.729 0.627 - - - 4.38e-03 -1.94e-03 1.81e-03 37.190 57
CPL -1.618 -0.737 1.618 52.240 N/A N/A 6.58e-03 N/A N/A 37.160 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 6.11e-09 4.38e-09 2.07e-09 1.38e-09 1.32e-08 1.39e-08 erg/cm2
90%_error_low -1.90e-09 -1.24e-09 -7.56e-10 -6.96e-10 -3.74e-09 -3.96e-09 erg/cm2
90%_error_hi 1.92e-09 1.24e-09 7.34e-10 7.92e-10 3.73e-09 3.96e-09 erg/cm2
Peak flux PL 2.69e-01 2.12e-01 1.12e-01 8.66e-02 6.32e-01 6.79e-01 ph/cm2/s
90%_error_low -1.31e-01 -7.49e-02 -6.04e-02 -8.66e-02 -2.24e-01 -2.41e-01 ph/cm2/s
90%_error_hi 1.43e-01 7.48e-02 6.26e-02 1.26e-01 2.24e-01 2.43e-01 ph/cm2/s
Fluence CPL 4.52e-09 1.25e-08 9.03e-09 8.99e-10 2.69e-08 2.70e-08 erg/cm2
90%_error_low -1.92e-09 -2.80e-09 -3.40e-09 -7.81e-10 -5.78e-09 -5.80e-09 erg/cm2
90%_error_hi 2.09e-09 2.93e-09 3.32e-09 8.01e-10 5.75e-09 5.78e-09 erg/cm2
Peak flux CPL 2.63e-01 2.21e-01 1.11e-01 5.36e-02 6.27e-01 6.50e-01 ph/cm2/s
90%_error_low N/A -1.62e-01 -6.53e-02 -5.36e-02 -2.98e-01 -3.21e-01 ph/cm2/s
90%_error_hi N/A 1.95e-01 6.66e-02 8.37e-02 2.28e-01 2.80e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 317.1528 -14.4123 0.0232 37.8436 4.4243 0.0616791 8.291 TRIG_00602278 Foreground time interval of the image: -0.024 0.128 (delta_t = 0.152 [sec]) Background time interval of the image: -60.888 -0.024 (delta_t = 60.864 [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 -0.024 sec. to 0.128 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.08003 ( -0.328724 0.259657 ) Norm@50keV : 6.96933E-03 ( -0.00222968 0.00216681 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.67 using 59 PHA bins. # Reduced chi-squared = 1.135 for 57 degrees of freedom # Null hypothesis probability = 2.265469e-01 Photon flux (15-150 keV) in 0.152 sec: 2.03230 ( -0.59089 0.59145 ) ph/cm2/s Energy fluence (15-150 keV) : 1.3224e-08 ( -3.73538e-09 3.73473e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.128 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.23012 ( -1.30788 2.34359 ) Epeak [keV] : 44.2382 ( -7.70854 6.84055 ) Norm@50keV : 1.25379 ( -1.25379 24.7177 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 35.95 using 59 PHA bins. # Reduced chi-squared = 0.6419 for 56 degrees of freedom # Null hypothesis probability = 9.829626e-01 Photon flux (15-150 keV) in 0.152 sec: 2.98053 ( -0.65674 0.66231 ) ph/cm2/s Energy fluence (15-150 keV) : 2.68982e-08 ( -5.7758e-09 5.75481e-09 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.446 sec. to 0.554 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.91468 ( -0.728611 0.626963 ) Norm@50keV : 4.37652E-03 ( -0.00193998 0.00181035 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.19 using 59 PHA bins. # Reduced chi-squared = 0.6524 for 57 degrees of freedom # Null hypothesis probability = 9.804825e-01 Photon flux (15-150 keV) in 1 sec: 0.632068 ( -0.224301 0.224494 ) ph/cm2/s Energy fluence (15-150 keV) : 4.02504e-08 ( -1.63404e-08 1.72393e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.446 sec. to 0.554 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.61836 ( -0.742738 1.61213 ) Epeak [keV] : 52.2399 ( ) Norm@50keV : 6.57616E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.16 using 59 PHA bins. # Reduced chi-squared = 0.6636 for 56 degrees of freedom # Null hypothesis probability = 9.753629e-01 Photon flux (15-150 keV) in 1 sec: 0.626580 ( -0.298187 0.228013 ) ph/cm2/s Energy fluence (15-150 keV) : 3.87552e-08 ( -2.24149e-08 1.86155e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.132 sec. Hardness ratio (energy fluence ratio) = 0.473630861062
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0490143e-08 S(50-150 keV) = 2.734464e-09
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 = 7.745847109252262E-01, IMY = -5.993151477292280E-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: -60.888000 -0.024000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4904 35.4566 11.6 39.6 -173.1 0.1378 1.0 7.0 Her X-1 268.4160 -1.4964 4.7 23.8 112.7 0.3031 2.5 3.9 SW J1753.5-0127 274.0066 -14.0382 887.3 29.0 83.8 0.0020 0.0 0.1 GX 17+2 285.0473 -24.8986 156.3 36.0 58.8 -0.0151 -0.1 1.5 HT1900.1-2455 288.7712 10.9466 0.7 0.0 -179.5 1.4041 17.1 1.6 GRS 1915+105 299.6115 35.2021 1.1 26.2 -106.7 1.2412 10.6 1.0 Cyg X-1 308.2024 40.9373 7.8 34.5 -100.7 0.2682 1.5 4.3 Cyg X-3 236.3446 12.0546 2.4 51.3 149.8 2.6231 4.9 ------ UNKNOWN 233.4307 41.9310 3.6 57.2 -173.7 1.5435 3.2 ------ UNKNOWN 332.0060 5.7111 2.4 43.0 -33.7 0.7815 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.024000 0.128000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6235 35.2940 6.3 39.4 -173.2 -0.0126 -1.8 8.6 Her X-1 268.2098 -1.4397 5.8 23.9 113.1 -0.0130 -2.0 9.5 SW J1753.5-0127 274.0944 -14.1396 5.8 29.0 83.5 0.0175 2.0 8.1 GX 17+2 285.0568 -24.9145 6.7 36.0 58.8 -0.0208 -1.7 1.2 HT1900.1-2455 288.8495 10.8305 9.4 0.1 25.0 -0.0059 -1.2 7.5 GRS 1915+105 299.7647 35.2685 61.4 26.3 -106.5 -0.0012 -0.2 9.4 Cyg X-1 308.2895 41.0293 14.3 34.6 -100.7 -0.0080 -0.8 9.3 Cyg X-3 317.1529 -14.4123 1.4 37.8 4.4 0.0617 8.3 ------ UNKNOWN 262.5487 24.1879 3.0 28.2 174.5 0.0218 3.8 ------ UNKNOWN 303.7407 -0.6863 2.7 18.9 0.1 0.0203 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 76.412590 302.192000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 285.1743 -24.7762 6.4 31.7 85.1 -0.7339 -1.8 11.5 HT1900.1-2455 288.8039 10.9506 1.0 37.9 149.7 4.6867 11.3 0.4 GRS 1915+105 299.5707 35.1951 1.4 52.4 -179.1 5.4394 8.0 1.0 Cyg X-1 308.1986 41.0115 3.8 56.1 -169.0 2.5994 3.1 5.3 Cyg X-3 326.2606 38.2063 8.0 53.3 -152.0 -1.1460 -1.5 8.1 Cyg X-2 312.2509 -27.3273 2.3 13.7 37.8 0.9908 5.0 ------ UNKNOWN 345.8748 -59.3524 2.6 49.6 0.3 1.9567 4.5 ------ UNKNOWN 5.7405 -40.2812 2.8 49.5 -29.8 1.9192 4.1 ------ UNKNOWN 319.2864 44.1995 3.6 58.7 -159.1 4.8840 3.2 ------ UNKNOWN