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: Fri Jan 17 18:45:39 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger420398
======================================================================
Trigger: 00420398 Segment: 000
BAT Trigger Time: 293856650.816 [s; MET]
Trigger Stop: 293856651.84 [s; MET]
UTC: 2010-04-25T02:50:45.077880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.186579434482 Dec: -26.4412771886309 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.39
Image Trigger?: NO
Rate S/N Ratio: 14.247806848775 [ if not an image trigger ]
Image S/N Ratio: 9.39
Analysis Position: [ source = BAT ]
RA: 299.186579434482 Dec: -26.4412771886309 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 299.172444443249 Dec: -26.4689278105844 [deg; J2000]
{ 19h 56m 41.4s , -26d 28' 08.1" }
+/- 2.27646847793376 [arcmin] (estimated 90% radius based on SNR)
+/- 1.27429295247065 [arcmin] (formal 1-sigma fit error)
SNR: 9.39170855598518
Angular difference between the analysis and refined position is 1.824534 arcmin
Partial Coding Fraction: 0.484375 [ including projection effects ]
Duration
T90: 38.9679999351501 +/- 2.31389718317248
Measured from: -1.37199997901917
to: 37.595999956131 [s; relative to TRIGTIME]
T50: 21.0519999265671 +/- 17.4017645209196
Measured from: 0.364000022411346
to: 21.4159999489784 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.23199999332428
to: 1.23199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.06400001049042
to: 39.4280000329018 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.387527 0.459657 0.090753 0.068352
0.055455 0.052808 0.045670 0.040966 [error]
Peak 0.063878 0.069415 0.016813 0.019438
0.009984 0.009350 0.007540 0.006345 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 41.492 -2.064 39.428
T90 38.968 -1.372 37.596
T50 21.052 0.364 21.416
Peak 1.000 0.232 1.232
====== 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 -2.437 -0.346 0.306 - - - 1.14e-03 -2.81e-04 2.78e-04 59.300 57
CPL -0.885 -1.330 2.455 25.353 -24.615 9.316 1.10e-02 -1.10e-02 4.38e-01 56.650 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 -2.357 -0.345 0.309 - - - 7.60e-03 -1.91e-03 1.88e-03 50.600 57
CPL 0.029 -1.877 3.006 29.376 N/A N/A 2.57e-01 N/A N/A 45.750 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-07 1.53e-07 1.13e-07 1.35e-07 4.64e-07 5.46e-07 erg/cm2
90%_error_low -2.72e-08 -2.63e-08 -3.60e-08 -6.70e-08 -8.63e-08 -1.26e-07 erg/cm2
90%_error_hi 2.77e-08 2.57e-08 3.95e-08 1.03e-07 9.05e-08 1.52e-07 erg/cm2
Peak flux PL 7.17e-01 4.37e-01 1.71e-01 8.94e-02 1.37e+00 1.41e+00 ph/cm2/s
90%_error_low -1.52e-01 -7.87e-02 -5.34e-02 -4.27e-02 -2.33e-01 -2.42e-01 ph/cm2/s
90%_error_hi 1.56e-01 7.78e-02 5.72e-02 6.22e-02 2.33e-01 2.42e-01 ph/cm2/s
Fluence CPL 1.37e-07 1.77e-07 1.08e-07 1.51e-07 4.61e-07 5.53e-07 erg/cm2
90%_error_low -3.12e-08 -3.64e-08 -3.15e-08 -6.79e-08 -8.49e-08 -1.26e-07 erg/cm2
90%_error_hi 3.04e-08 3.78e-08 4.40e-08 1.21e-07 9.42e-08 1.73e-07 erg/cm2
Peak flux CPL N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_low -1.52e-01 -7.87e-02 -5.34e-02 -4.27e-02 -2.33e-01 -2.42e-01 ph/cm2/s
90%_error_hi 1.56e-01 7.78e-02 5.72e-02 6.22e-02 2.33e-01 2.42e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 299.1724 -26.4689 0.0205 28.5240 -83.3437 0.7028538 9.392 TRIG_00420398 Foreground time interval of the image: -2.064 18.285 (delta_t = 20.349 [sec]) Background time interval of the image: -239.816 -2.064 (delta_t = 237.752 [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 -2.064 sec. to 39.428 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.43681 ( -0.346267 0.305951 ) Norm@50keV : 1.13551E-03 ( -0.000280728 0.000277733 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.30 using 59 PHA bins. # Reduced chi-squared = 1.040 for 57 degrees of freedom # Null hypothesis probability = 3.916241e-01 Photon flux (15-150 keV) in 41.49 sec: 0.214741 ( -0.032374 0.032375 ) ph/cm2/s Energy fluence (15-150 keV) : 4.63655e-07 ( -8.63316e-08 9.04901e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.064 sec. to 39.428 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.884688 ( -1.3345 2.45089 ) Epeak [keV] : 25.3526 ( -24.6552 9.27637 ) Norm@50keV : 1.09981E-02 ( -0.0111245 0.438117 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.65 using 59 PHA bins. # Reduced chi-squared = 1.012 for 56 degrees of freedom # Null hypothesis probability = 4.504647e-01 Photon flux (15-150 keV) in 41.49 sec: 0.206143 ( -0.032952 0.033237 ) ph/cm2/s Energy fluence (15-150 keV) : 4.61078e-07 ( -8.49176e-08 9.42035e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.232 sec. to 1.232 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.35659 ( -0.3452 0.309397 ) Norm@50keV : 7.59650E-03 ( -0.00191019 0.00188311 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.60 using 59 PHA bins. # Reduced chi-squared = 0.8878 for 57 degrees of freedom # Null hypothesis probability = 7.123023e-01 Photon flux (15-150 keV) in 1 sec: 1.37082 ( -0.23345 0.23344 ) ph/cm2/s Energy fluence (15-150 keV) : 7.34193e-08 ( -1.48257e-08 1.53862e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.232 sec. to 1.232 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.0289198 ( -1.94219 2.94046 ) Epeak [keV] : 29.3762 ( ) Norm@50keV : 0.257440 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.72 using 59 PHA bins. # Reduced chi-squared = 0.8164 for 56 degrees of freedom # Null hypothesis probability = 8.350901e-01 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 38.968 sec. Hardness ratio (energy fluence ratio) = 0.738822388149
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.989874e-07 S(50-150 keV) = 1.6468007e-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 = 6.299890713493866E-02, IMY = 5.398339803588269E-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: -239.816000 -2.064000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9856 -15.6525 0.4 22.8 95.1 7.7928 29.0 0.8 Sco X-1 255.9056 -37.9809 17.2 18.8 23.2 0.1425 0.7 9.1 4U 1700-377 256.4371 -36.3866 6.7 17.3 25.3 0.3593 1.7 2.2 GX 349+2 262.9337 -24.6543 10.8 5.2 55.4 0.2032 1.1 6.8 GX 1+4 264.7513 -44.4520 4.0 22.2 -1.6 0.6687 2.9 0.4 4U 1735-44 268.4914 -1.5785 10.2 20.8 173.2 0.2445 1.1 10.6 SW J1753.5-0127 270.3153 -25.1001 6.4 3.4 -44.3 0.4010 1.9 2.1 GX 5-1 270.3688 -25.6719 3.3 3.9 -39.7 0.8417 4.0 5.6 GRS 1758-258 273.9540 -13.9633 3.9 10.1 -153.5 0.6414 3.0 5.3 GX 17+2 276.0165 -30.3653 8.4 10.7 -47.9 0.2963 1.4 4.7 H1820-303 284.8744 -24.7735 0.0 15.6 -85.8 0.0354 0.2 12.5 HT1900.1-2455 288.7733 10.9523 1.3 39.0 -154.5 3.0662 8.7 1.5 GRS 1915+105 263.0754 -33.7740 6.1 12.2 12.2 0.4242 1.9 5.6 GX 354-0 225.5993 -22.4098 2.8 39.2 73.6 3.1851 4.1 ------ UNKNOWN 320.9796 -54.7577 2.9 50.7 -44.4 5.0600 3.9 ------ UNKNOWN 313.8062 -29.9935 3.1 41.5 -77.4 3.5311 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.064000 18.284600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.7896 -15.7339 0.0 23.0 94.8 0.1933 2.9 12.3 Sco X-1 255.9850 -37.8710 147.2 18.7 23.2 0.0039 0.1 1.6 4U 1700-377 256.4380 -36.4168 40.1 17.3 25.2 -0.0146 -0.3 0.4 GX 349+2 262.9548 -24.6209 6.5 5.2 55.6 0.0878 1.8 8.0 GX 1+4 264.9706 -44.3255 0.0 22.1 -2.0 -0.1452 -2.7 12.3 4U 1735-44 268.2883 -1.5292 9.3 20.9 172.6 0.0655 1.2 6.6 SW J1753.5-0127 270.0993 -25.2095 0.0 3.4 -40.5 0.0821 1.6 12.7 GX 5-1 270.3878 -25.9033 11.0 4.1 -38.2 0.0536 1.1 10.7 GRS 1758-258 273.8465 -14.0917 71.3 9.9 -153.6 -0.0077 -0.2 9.8 GX 17+2 276.0417 -30.3359 4.8 10.7 -48.1 0.1153 2.4 6.3 H1820-303 285.1679 -25.0667 12.7 15.9 -84.8 0.0515 0.9 11.3 HT1900.1-2455 288.6771 10.9874 5.4 39.0 -154.7 -0.1503 -2.1 7.6 GRS 1915+105 262.9937 -33.8225 13.0 12.3 12.4 0.0420 0.9 0.8 GX 354-0 292.6154 -17.9259 2.0 23.4 -104.4 0.3500 5.8 ------ UNKNOWN 299.1721 -26.4660 1.2 28.5 -83.3 0.7049 9.4 ------ UNKNOWN 311.8331 -43.9606 2.4 41.8 -56.2 0.6369 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 68.084600 962.250600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.1020 -37.9354 6.0 37.8 72.0 -2.7721 -1.9 7.7 4U 1700-377 256.4871 -36.5098 11.2 37.4 74.3 1.5515 1.0 5.8 GX 349+2 262.9410 -24.7495 4.4 32.6 95.4 2.8299 2.6 3.7 GX 1+4 264.8377 -44.6052 771.5 32.9 58.2 0.0134 0.0 10.2 4U 1735-44 268.4990 -1.5007 6.0 38.6 135.7 2.4301 1.9 8.4 SW J1753.5-0127 270.4549 -24.9848 9.6 25.9 97.4 -0.9476 -1.2 10.9 GX 5-1 270.2589 -25.6068 11.4 25.9 95.9 0.7938 1.0 8.5 GRS 1758-258 274.0393 -14.0776 1.7 26.6 123.4 4.5570 6.7 3.1 GX 17+2 275.8849 -30.3850 3.5 20.8 84.2 1.9414 3.3 2.3 H1820-303 285.0201 -24.9903 6.3 12.8 104.0 0.8751 1.8 4.3 HT1900.1-2455 288.7848 10.9248 0.7 38.7 174.1 11.7734 15.9 1.5 GRS 1915+105 262.8672 -33.9294 5.7 32.1 78.2 -2.0517 -2.0 8.3 GX 354-0 265.5826 -76.9422 2.6 53.0 19.6 9.6527 4.4 ------ UNKNOWN 283.5526 23.0813 2.4 51.8 172.2 7.6044 4.8 ------ UNKNOWN 325.9297 12.7874 4.7 47.1 -132.6 5.2519 2.5 ------ UNKNOWN 358.9421 -42.8038 3.7 50.7 -44.4 12.7373 3.1 ------ UNKNOWN