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 20 02:46:00 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger309096
======================================================================
Trigger: 00309096 Segment: 000
BAT Trigger Time: 229748062.016 [s; MET]
Trigger Stop: 229748062.528 [s; MET]
UTC: 2008-04-13T02:54:19.302440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 287.289929388104 Dec: -27.679225960068 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.06
Image Trigger?: NO
Rate S/N Ratio: 15.6524758424985 [ if not an image trigger ]
Image S/N Ratio: 9.06
Analysis Position: [ source = BAT ]
RA: 287.289929388104 Dec: -27.679225960068 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 287.299178959777 Dec: -27.67775699745 [deg; J2000]
{ 19h 09m 11.8s , -27d 40' 39.9" }
+/- 0.64947967629121 [arcmin] (estimated 90% radius based on SNR)
+/- 0.170347385175325 [arcmin] (formal 1-sigma fit error)
SNR: 56.3484348898179
Angular difference between the analysis and refined position is 0.499308 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 46.3600000143051 +/- 0.481215117373871
Measured from: 1.11599999666214
to: 47.4760000109673 [s; relative to TRIGTIME]
T50: 15.4759999811649 +/- 0.798979370890493
Measured from: 2.84400001168251
to: 18.3199999928474 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.64399999380112
to: 2.64399999380112 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0800000131130219
to: 50.33599999547 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.538148 2.201969 1.573177 0.387463
0.046508 0.044330 0.039610 0.037403 [error]
Peak 0.134871 0.251607 0.242727 0.069710
0.008356 0.009030 0.008725 0.006521 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 50.416 -0.080 50.336
T90 46.360 1.116 47.476
T50 15.476 2.844 18.320
Peak 1.000 1.644 2.644
====== 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 -1.530 -0.052 0.052 - - - 7.40e-03 -1.96e-04 1.96e-04 75.380 57
CPL -1.426 -0.150 0.211 291.092 -291.092 -291.092 8.28e-03 -1.03e-03 2.08e-03 74.630 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 -1.130 -0.069 0.070 - - - 4.74e-02 -1.87e-03 1.87e-03 52.670 57
CPL -0.744 -0.274 0.292 182.090 -54.917 276.598 7.11e-02 -1.73e-02 2.45e-02 46.720 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 4.90e-07 8.84e-07 1.22e-06 3.53e-06 3.52e-06 6.13e-06 erg/cm2
90%_error_low -2.60e-08 -2.67e-08 -4.18e-08 -2.72e-07 -9.97e-08 -2.95e-07 erg/cm2
90%_error_hi 2.65e-08 2.66e-08 4.17e-08 2.88e-07 1.00e-07 3.08e-07 erg/cm2
Peak flux PL 1.37e+00 1.72e+00 1.57e+00 2.50e+00 5.52e+00 7.17e+00 ph/cm2/s
90%_error_low -1.08e-01 -8.30e-02 -6.97e-02 -2.32e-01 -2.25e-01 -3.00e-01 ph/cm2/s
90%_error_hi 1.11e-01 8.25e-02 6.94e-02 2.47e-01 2.25e-01 3.03e-01 ph/cm2/s
Fluence CPL 4.78e-07 8.90e-07 1.23e-06 3.02e-06 3.49e-06 5.62e-06 erg/cm2
90%_error_low -3.35e-08 -2.89e-08 -4.43e-08 -7.71e-07 -1.18e-07 -7.79e-07 erg/cm2
90%_error_hi 3.19e-08 2.91e-08 4.46e-08 5.77e-07 1.17e-07 6.16e-07 erg/cm2
Peak flux CPL 1.24e+00 1.76e+00 1.64e+00 1.70e+00 5.42e+00 6.34e+00 ph/cm2/s
90%_error_low -1.35e-01 -8.94e-02 -8.42e-02 -3.90e-01 -2.35e-01 -4.64e-01 ph/cm2/s
90%_error_hi 1.39e-01 9.00e-02 8.51e-02 5.35e-01 2.35e-01 5.79e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 287.2992 -27.6778 0.0034 16.7003 -90.6024 2.8883762 56.348 TRIG_00309096 Foreground time interval of the image: -0.080 10.685 (delta_t = 10.765 [sec]) Background time interval of the image: -239.016 -0.080 (delta_t = 238.936 [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 -0.080 sec. to 50.336 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52958 ( -0.0523954 0.0523745 ) Norm@50keV : 7.39868E-03 ( -0.000196032 0.000195954 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 75.38 using 59 PHA bins. # Reduced chi-squared = 1.322 for 57 degrees of freedom # Null hypothesis probability = 5.198109e-02 Photon flux (15-150 keV) in 50.42 sec: 0.931214 ( -0.027027 0.027115 ) ph/cm2/s Energy fluence (15-150 keV) : 3.52284e-06 ( -9.97146e-08 1.0003e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.080 sec. to 50.336 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.42563 ( -0.149594 0.211438 ) Epeak [keV] : 291.092 ( -291.23 -291.23 ) Norm@50keV : 8.28496E-03 ( -0.00103163 0.00208143 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.63 using 59 PHA bins. # Reduced chi-squared = 1.333 for 56 degrees of freedom # Null hypothesis probability = 4.873905e-02 Photon flux (15-150 keV) in 50.42 sec: 0.923466 ( -0.030733 0.029927 ) ph/cm2/s Energy fluence (15-150 keV) : 3.49046e-06 ( -1.18031e-07 1.17342e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.644 sec. to 2.644 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.13034 ( -0.0694003 0.0698127 ) Norm@50keV : 4.74207E-02 ( -0.00186898 0.00186845 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.67 using 59 PHA bins. # Reduced chi-squared = 0.9241 for 57 degrees of freedom # Null hypothesis probability = 6.380408e-01 Photon flux (15-150 keV) in 1 sec: 5.51779 ( -0.22484 0.22511 ) ph/cm2/s Energy fluence (15-150 keV) : 4.91157e-07 ( -2.12088e-08 2.12558e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.644 sec. to 2.644 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.743651 ( -0.274113 0.292455 ) Epeak [keV] : 182.090 ( -54.9172 276.598 ) Norm@50keV : 7.10963E-02 ( -0.0173063 0.0244968 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.72 using 59 PHA bins. # Reduced chi-squared = 0.8342 for 56 degrees of freedom # Null hypothesis probability = 8.070488e-01 Photon flux (15-150 keV) in 1 sec: 5.41719 ( -0.23525 0.23536 ) ph/cm2/s Energy fluence (15-150 keV) : 4.80485e-07 ( -2.28703e-08 2.2749e-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 = -3.154197460994845E-03, IMY = 3.000031334939362E-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: -239.016000 -0.080000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9793 -15.6510 0.2 24.4 101.7 29.0852 73.8 0.6 Sco X-1 255.9920 -37.8634 0.8 15.7 30.1 3.8463 14.1 1.2 4U 1700-377 256.4768 -36.4483 2.2 14.4 33.2 1.4106 5.1 2.5 GX 349+2 263.0161 -24.8901 8.0 5.2 95.3 -0.4252 -1.4 8.7 GX 1+4 264.8956 -44.6255 0.0 18.5 -1.1 0.4298 1.5 12.4 4U 1735-44 268.4241 -1.4979 4.7 24.8 170.1 0.7234 2.5 4.3 SW J1753.5-0127 270.2547 -25.0364 2.7 2.0 -140.0 1.2664 4.3 3.0 GX 5-1 270.3625 -25.7779 10.6 1.7 -118.3 0.3226 1.1 3.9 GRS 1758-258 274.0066 -13.9546 3.0 13.4 -166.2 1.0893 3.8 4.9 GX 17+2 275.9642 -30.3283 4.7 7.6 -66.1 0.7091 2.5 3.1 H1820-303 284.9650 -25.0426 68.3 14.8 -100.9 -0.0540 -0.2 8.3 HT1900.1-2455 288.8035 10.9399 21.5 42.1 -159.1 0.2858 0.5 0.5 GRS 1915+105 262.8933 -33.7581 6.4 8.9 22.8 0.5218 1.8 6.6 GX 354-0 258.7705 -32.5657 2.4 10.6 42.1 1.3380 4.9 ------ UNKNOWN 266.7974 -27.3312 1.4 1.9 48.2 2.4231 8.2 ------ UNKNOWN 292.2447 -56.4132 2.4 34.5 -32.5 1.7288 4.9 ------ UNKNOWN 312.9417 -19.4465 4.5 41.2 -99.5 4.5716 2.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.080000 10.684600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9785 -15.6938 2.0 24.4 101.6 -0.3733 -5.9 3.2 Sco X-1 256.1557 -37.9089 4.0 15.6 29.7 0.1333 2.9 8.9 4U 1700-377 256.2850 -36.3083 7.6 14.5 34.0 0.0717 1.5 10.0 GX 349+2 262.8603 -24.6593 23.5 5.4 97.2 0.0218 0.5 9.6 GX 1+4 264.8390 -44.6173 7.3 18.5 -1.0 -0.0730 -1.6 10.8 4U 1735-44 268.3140 -1.2931 7.1 25.0 169.9 0.0858 1.6 10.1 SW J1753.5-0127 270.4292 -25.2129 5.0 2.0 -133.2 -0.1070 -2.3 11.2 GX 5-1 270.2268 -25.8843 4.8 1.5 -116.1 -0.1105 -2.4 9.4 GRS 1758-258 273.9221 -14.1763 9.1 13.1 -166.1 -0.0547 -1.3 9.7 GX 17+2 276.0314 -30.4209 108.9 7.7 -65.7 -0.0047 -0.1 6.4 H1820-303 285.1985 -24.9982 4.0 15.0 -100.9 0.1366 2.9 10.0 HT1900.1-2455 288.9177 11.0478 7.5 42.3 -159.0 -0.1182 -1.5 9.3 GRS 1915+105 262.8282 -33.7504 4.0 8.9 23.1 -0.1249 -2.9 9.5 GX 354-0 261.3894 23.4008 2.1 50.2 161.9 0.8482 5.4 ------ UNKNOWN 287.2992 -27.6778 0.2 16.7 -90.6 2.8883 56.3 ------ UNKNOWN 319.5195 -43.7127 3.3 44.4 -62.8 0.6981 3.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 50.084590 352.184600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9987 -37.8360 0.6 28.0 67.0 6.2099 18.2 0.8 4U 1700-377 256.5895 -36.5529 32.6 27.3 69.5 -0.1140 -0.4 10.8 GX 349+2 262.8827 -24.7630 6.0 22.0 98.3 -0.5990 -1.9 7.0 GX 1+4 264.7910 -44.6011 8.2 24.7 47.0 0.4060 1.4 9.3 4U 1735-44 268.4091 -1.4416 5.7 31.9 148.5 0.7968 2.0 2.6 SW J1753.5-0127 270.2838 -25.0762 2.2 15.4 102.1 1.3467 5.3 0.2 GX 5-1 270.2300 -25.7009 5.0 15.3 99.8 0.6211 2.4 4.7 GRS 1758-258 274.1075 -14.0762 2.0 18.3 141.6 1.4200 5.6 6.4 GX 17+2 275.8915 -30.3202 3.1 10.3 78.7 0.8808 3.8 3.3 H1820-303 285.0207 -24.8505 4.4 3.5 150.3 0.6019 2.6 4.3 HT1900.1-2455 288.8397 10.9619 9.9 38.7 -171.3 0.4138 1.2 2.6 GRS 1915+105 262.9023 -33.8327 8.9 21.8 73.8 0.3674 1.3 4.3 GX 354-0 257.1472 14.3043 2.6 51.2 147.6 5.9903 4.5 ------ UNKNOWN 266.8168 -27.3714 1.2 18.1 92.5 2.5919 9.6 ------ UNKNOWN 277.3268 -23.7997 2.1 9.8 117.5 1.3313 5.5 ------ UNKNOWN 348.2448 -46.7216 3.7 50.7 -44.5 5.2914 3.1 ------ UNKNOWN 333.1977 -24.1351 3.8 41.2 -77.9 3.8289 3.1 ------ UNKNOWN 320.9516 4.9619 2.8 46.1 -123.7 5.8598 4.1 ------ UNKNOWN