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: Sun Jan 19 16:55:25 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger351525
======================================================================
Trigger: 00351525 Segment: 000
BAT Trigger Time: 263538608.32 [s; MET]
Trigger Stop: 263538616.512 [s; MET]
UTC: 2009-05-09T05:10:03.594140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 241.403522652029 Dec: -28.4037305477642 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.05
Image Trigger?: NO
Rate S/N Ratio: 16.0312195418814 [ if not an image trigger ]
Image S/N Ratio: 7.05
Analysis Position: [ source = BAT ]
RA: 241.403522652029 Dec: -28.4037305477642 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 241.420894933467 Dec: -28.3841180914589 [deg; J2000]
{ 16h 05m 41.0s , -28d 23' 02.8" }
+/- 2.13333022546237 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10441212014666 [arcmin] (formal 1-sigma fit error)
SNR: 10.3047011020728
Angular difference between the analysis and refined position is 1.491817 arcmin
Partial Coding Fraction: 0.2929688 [ including projection effects ]
Duration
T90: 336.375999987125 +/- 33.264639032504
Measured from: -47.4639999866486
to: 288.912000000477 [s; relative to TRIGTIME]
T50: 245.888000011444 +/- 12.1362869088005
Measured from: 5.34400001168251
to: 251.232000023127 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 20.7319999933243
to: 21.7319999933243 [s; relative to TRIGTIME]
Total Fluence
Measured from: -62.3959999978542
to: 298.696000009775 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.599786 2.067371 1.339474 0.429650
0.252699 0.210318 0.169595 0.147888 [error]
Peak 0.032488 0.082620 0.051915 0.020225
0.013423 0.012455 0.010920 0.008600 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 361.092 -62.396 298.696
T90 336.376 -47.464 288.912
T50 245.888 5.344 251.232
Peak 1.000 20.732 21.732
====== 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 -1.695 -0.208 0.206 - - - 9.89e-04 -1.17e-04 1.16e-04 61.570 57
CPL -1.332 -0.796 0.886 88.490 -58.595 -88.490 1.53e-03 -6.26e-04 2.77e-03 60.890 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 -1.369 -0.333 0.340 - - - 1.25e-02 -2.42e-03 2.42e-03 48.430 57
CPL -0.976 -1.534 1.623 138.607 -138.607 -138.607 1.93e-02 -9.02e-03 9.50e-02 48.140 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 5.48e-07 8.94e-07 1.10e-06 2.70e-06 3.31e-06 5.24e-06 erg/cm2
90%_error_low -1.05e-07 -1.07e-07 -1.71e-07 -7.94e-07 -4.05e-07 -9.48e-07 erg/cm2
90%_error_hi 1.11e-07 1.06e-07 1.70e-07 1.00e-06 4.09e-07 1.11e-06 erg/cm2
Peak flux PL 4.53e-01 4.93e-01 3.81e-01 4.84e-01 1.51e+00 1.81e+00 ph/cm2/s
90%_error_low -1.57e-01 -1.14e-01 -8.57e-02 -1.93e-01 -3.10e-01 -3.53e-01 ph/cm2/s
90%_error_hi 1.77e-01 1.11e-01 8.41e-02 2.59e-01 3.13e-01 3.54e-01 ph/cm2/s
Fluence CPL 5.17e-07 9.27e-07 1.12e-06 1.54e-06 3.20e-06 4.11e-06 erg/cm2
90%_error_low -1.23e-07 -1.25e-07 -1.78e-07 -1.01e-06 -4.60e-07 -1.14e-06 erg/cm2
90%_error_hi 1.27e-07 1.31e-07 1.83e-07 2.09e-06 4.60e-07 1.57e-06 erg/cm2
Peak flux CPL 4.17e-01 5.08e-01 3.97e-01 3.22e-01 1.48e+00 1.64e+00 ph/cm2/s
90%_error_low -1.87e-01 -1.23e-01 -9.63e-02 -3.22e-01 -3.19e-01 -4.26e-01 ph/cm2/s
90%_error_hi 2.02e-01 1.30e-01 1.02e-01 2.32e-01 3.22e-01 4.20e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 241.4209 -28.3841 0.0186 32.5726 60.5478 7.0557285 10.305 TRIG_00351525 Foreground time interval of the image: -62.396 293.581 (delta_t = 355.977 [sec]) Background time interval of the image: -239.320 -62.396 (delta_t = 176.924 [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 -62.396 sec. to 298.696 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.69519 ( -0.207688 0.206287 ) Norm@50keV : 9.89493E-04 ( -0.0001167 0.000115851 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.57 using 59 PHA bins. # Reduced chi-squared = 1.080 for 57 degrees of freedom # Null hypothesis probability = 3.159904e-01 Photon flux (15-150 keV) in 361.1 sec: 0.131201 ( -0.015707 0.015795 ) ph/cm2/s Energy fluence (15-150 keV) : 3.31e-06 ( -4.04789e-07 4.08585e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -62.396 sec. to 298.696 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33154 ( -0.796066 0.886305 ) Epeak [keV] : 88.4904 ( -58.6126 -88.5083 ) Norm@50keV : 1.52583E-03 ( -0.000626117 0.00277493 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.89 using 59 PHA bins. # Reduced chi-squared = 1.087 for 56 degrees of freedom # Null hypothesis probability = 3.043496e-01 Photon flux (15-150 keV) in 361.1 sec: 0.128555 ( -0.016635 0.016671 ) ph/cm2/s Energy fluence (15-150 keV) : 3.20485e-06 ( -4.59818e-07 4.5959e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 20.732 sec. to 21.732 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.36923 ( -0.33288 0.339944 ) Norm@50keV : 1.24738E-02 ( -0.00241724 0.00241724 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.43 using 59 PHA bins. # Reduced chi-squared = 0.8496 for 57 degrees of freedom # Null hypothesis probability = 7.833617e-01 Photon flux (15-150 keV) in 1 sec: 1.50883 ( -0.3099 0.31253 ) ph/cm2/s Energy fluence (15-150 keV) : 1.21328e-07 ( -2.49229e-08 2.51087e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.732 sec. to 21.732 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.9762 ( -1.53449 1.62255 ) Epeak [keV] : 138.607 ( -138.61 -138.61 ) Norm@50keV : 1.92816E-02 ( -0.00901616 0.0950397 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.14 using 59 PHA bins. # Reduced chi-squared = 0.8596 for 56 degrees of freedom # Null hypothesis probability = 7.632934e-01 Photon flux (15-150 keV) in 1 sec: 1.48397 ( -0.31919 0.32162 ) ph/cm2/s Energy fluence (15-150 keV) : 1.18667e-07 ( -2.73419e-08 2.64272e-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 = 3.141223061373798E-01, IMY = -5.562907242225242E-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: -239.320000 -62.396000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9891 -15.6550 0.4 28.5 85.4 9.1928 29.2 1.0 Sco X-1 255.9882 -37.8068 1.5 26.5 31.5 1.6973 7.7 2.2 4U 1700-377 256.4146 -36.3501 4.1 25.2 33.3 0.6176 2.8 4.5 GX 349+2 263.1684 -24.7850 4.9 13.2 49.2 0.4199 2.4 9.0 GX 1+4 264.9125 -44.5043 13.9 28.7 11.5 -0.1802 -0.8 8.0 4U 1735-44 268.3451 -1.4567 3.7 16.8 154.4 0.5345 3.1 1.4 SW J1753.5-0127 270.3036 -25.0703 2.4 9.0 23.1 0.8850 4.9 1.2 GX 5-1 270.4154 -25.6749 4.5 9.5 20.9 0.5094 2.8 7.3 GRS 1758-258 274.0798 -14.0560 4.6 3.1 165.8 0.4562 2.5 4.5 GX 17+2 275.9456 -30.4356 2.2 13.4 -7.8 0.8817 5.3 4.2 H1820-303 285.2000 -24.9348 20.0 12.6 -52.6 -0.1031 -0.6 9.0 HT1900.1-2455 288.7959 10.9289 1.7 31.3 -155.7 1.3513 6.9 1.0 GRS 1915+105 299.5981 35.1986 2.5 57.4 -159.0 4.7075 4.6 0.4 Cyg X-1 262.8073 -33.8931 9.8 19.9 27.0 0.2057 1.2 9.7 GX 354-0 242.6342 7.8674 3.2 40.3 122.5 1.9993 3.6 ------ UNKNOWN 277.3703 -23.8191 2.1 7.2 -23.1 0.9049 5.5 ------ UNKNOWN 293.2415 -5.9118 2.6 21.3 -122.5 0.8124 4.5 ------ UNKNOWN 320.0869 -32.2195 3.5 43.6 -64.0 3.2218 3.3 ------ UNKNOWN 324.2266 -47.0252 3.2 50.4 -45.5 4.0068 3.6 ------ UNKNOWN 314.0932 4.6468 3.7 44.6 -118.8 2.5989 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -62.396000 293.580600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9696 -15.7732 4.0 28.5 85.1 -1.7772 -2.9 8.0 Sco X-1 256.0092 -37.8787 1.4 26.5 31.4 3.5458 8.3 2.3 4U 1700-377 256.2377 -36.5333 0.0 25.4 33.2 -0.0540 -0.1 11.6 GX 349+2 263.1892 -24.6196 0.0 13.1 49.8 -0.7462 -2.2 12.4 GX 1+4 264.8219 -44.4040 18.1 28.6 11.7 -0.2639 -0.6 4.4 4U 1735-44 268.4514 -1.4583 8.1 16.8 154.8 0.5012 1.4 5.0 SW J1753.5-0127 270.3549 -25.1561 11.3 9.0 22.6 -0.3489 -1.1 6.0 GX 5-1 270.1517 -25.5808 0.0 9.5 22.4 0.3251 1.0 12.7 GRS 1758-258 274.0605 -14.0687 3.9 3.0 165.4 -0.9915 -3.0 3.7 GX 17+2 276.0520 -30.2216 45.7 13.2 -8.3 -0.0831 -0.3 10.9 H1820-303 284.8721 -24.9101 4.9 12.3 -51.9 -0.8422 -2.3 8.9 HT1900.1-2455 288.6624 11.0084 6.5 31.3 -156.0 0.6472 1.8 8.8 GRS 1915+105 299.5361 35.2125 10.6 57.3 -159.1 1.8018 1.1 2.7 Cyg X-1 263.1555 -33.8831 4.3 19.7 26.3 0.9515 2.7 8.8 GX 354-0 241.4209 -28.3842 1.1 32.6 60.5 7.0591 10.3 ------ UNKNOWN 275.6430 16.7981 2.9 33.9 178.5 1.6714 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 415.180600 832.280590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5743 35.1841 1.1 47.6 139.5 13.6099 10.8 1.3 Cyg X-1 308.0821 40.9438 3.4 42.4 149.6 2.3063 3.3 1.4 Cyg X-3 326.3053 38.3291 4.7 28.8 157.0 0.8313 2.4 6.3 Cyg X-2 314.8421 57.9226 2.6 47.2 173.6 2.4959 4.4 ------ UNKNOWN 1.6016 -26.9725 2.5 46.8 4.4 2.6509 4.7 ------ UNKNOWN 345.3486 40.2258 3.1 22.1 -171.6 0.9888 3.8 ------ UNKNOWN