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 18:37:21 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger345127
======================================================================
Trigger: 00345127 Segment: 000
BAT Trigger Time: 257923195.584 [s; MET]
Trigger Stop: 257923195.968 [s; MET]
UTC: 2009-03-05T05:19:51.035240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 241.756459293576 Dec: -31.5669267307704 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.11
Image Trigger?: NO
Rate S/N Ratio: 16.2172747402269 [ if not an image trigger ]
Image S/N Ratio: 9.11
Analysis Position: [ source = BAT ]
RA: 241.756459293576 Dec: -31.5669267307704 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 241.756102949644 Dec: -31.5685682094193 [deg; J2000]
{ 16h 07m 01.5s , -31d 34' 06.8" }
+/- 2.29581521493969 [arcmin] (estimated 90% radius based on SNR)
+/- 1.3549290711594 [arcmin] (formal 1-sigma fit error)
SNR: 9.27885086714485
Angular difference between the analysis and refined position is 0.100159 arcmin
Partial Coding Fraction: 0.5 [ including projection effects ]
Duration
T90: 0.540000021457672 +/- 0.161046592592981
Measured from: 0.0439999997615814
to: 0.584000021219254 [s; relative to TRIGTIME]
T50: 0.256000012159348 +/- 0.13023057604617
Measured from: 0.104000002145767
to: 0.360000014305115 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.179999977350235
to: 0.820000022649765 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00800001621246338
to: 0.631999999284744 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.018075 0.035602 0.045664 0.026835
0.007157 0.006812 0.006815 0.005772 [error]
Peak 0.016520 0.035621 0.043961 0.020835
0.008960 0.008407 0.008061 0.007016 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.624 0.008 0.632
T90 0.540 0.044 0.584
T50 0.256 0.104 0.360
Peak 1.000 -0.180 0.820
====== 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 -0.915 -0.310 0.331 - - - 1.30e-02 -2.48e-03 2.41e-03 46.630 57
CPL -0.549 -0.643 1.547 255.789 -255.789 -255.789 1.81e-02 -7.23e-03 4.64e-02 46.370 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 -1.008 -0.383 0.413 - - - 7.87e-03 -1.85e-03 1.80e-03 62.120 57
CPL -0.256 0.256 2.365 145.625 -145.625 -145.625 1.57e-02 -9.34e-03 9.16e-02 61.470 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 6.03e-09 1.59e-08 3.37e-08 1.84e-07 9.08e-08 2.40e-07 erg/cm2
90%_error_low -2.23e-09 -3.87e-09 -6.01e-09 -6.68e-08 -1.60e-08 -6.98e-08 erg/cm2
90%_error_hi 2.64e-09 3.81e-09 5.95e-09 9.10e-08 1.61e-08 9.07e-08 erg/cm2
Peak flux PL 2.02e-01 2.73e-01 2.72e-01 4.88e-01 9.06e-01 1.24e+00 ph/cm2/s
90%_error_low -8.96e-02 -8.34e-02 -6.16e-02 -2.03e-01 -2.15e-01 -2.77e-01 ph/cm2/s
90%_error_hi 1.10e-01 8.25e-02 6.10e-02 2.81e-01 2.19e-01 2.86e-01 ph/cm2/s
Fluence CPL 5.33e-09 1.60e-08 3.52e-08 1.25e-07 9.01e-08 1.99e-07 erg/cm2
90%_error_low -2.89e-09 -4.10e-09 -7.20e-09 -8.50e-08 -1.65e-08 -1.04e-07 erg/cm2
90%_error_hi 3.18e-09 4.02e-09 8.07e-09 8.00e-08 1.63e-08 6.63e-08 erg/cm2
Peak flux CPL 1.57e-01 2.74e-01 2.97e-01 2.80e-01 8.71e-01 1.01e+00 ph/cm2/s
90%_error_low -1.10e-01 -9.60e-02 -7.51e-02 -2.80e-01 -2.25e-01 -3.20e-01 ph/cm2/s
90%_error_hi 1.40e-01 9.03e-02 8.52e-02 2.95e-01 2.30e-01 3.85e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 241.7561 -31.5686 0.0207 42.8525 -13.7543 0.1260840 9.279 TRIG_00345127 Foreground time interval of the image: 0.008 0.632 (delta_t = 0.624 [sec]) Background time interval of the image: -707.483 -702.516 (delta_t = 4.968 [sec]) -239.584 0.008 (delta_t = 239.592 [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 0.008 sec. to 0.632 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.915351 ( -0.309617 0.331196 ) Norm@50keV : 1.30437E-02 ( -0.00247986 0.00241399 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.63 using 59 PHA bins. # Reduced chi-squared = 0.8181 for 57 degrees of freedom # Null hypothesis probability = 8.348331e-01 Photon flux (15-150 keV) in 0.624 sec: 1.49738 ( -0.28078 0.28478 ) ph/cm2/s Energy fluence (15-150 keV) : 9.08145e-08 ( -1.60346e-08 1.607e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.632 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.548673 ( -0.642614 1.54749 ) Epeak [keV] : 255.789 ( -255.789 -255.789 ) Norm@50keV : 1.81246E-02 ( -0.00722607 0.0464369 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.37 using 59 PHA bins. # Reduced chi-squared = 0.8280 for 56 degrees of freedom # Null hypothesis probability = 8.170414e-01 Photon flux (15-150 keV) in 0.624 sec: 1.47002 ( -0.29176 0.2977 ) ph/cm2/s Energy fluence (15-150 keV) : 9.01412e-08 ( -1.64603e-08 1.62963e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.180 sec. to 0.820 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00761 ( -0.383289 0.412821 ) Norm@50keV : 7.86898E-03 ( -0.00184621 0.00180482 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.12 using 59 PHA bins. # Reduced chi-squared = 1.090 for 57 degrees of freedom # Null hypothesis probability = 2.987764e-01 Photon flux (15-150 keV) in 1 sec: 0.906323 ( -0.214637 0.218727 ) ph/cm2/s Energy fluence (15-150 keV) : 8.48711e-08 ( -1.90856e-08 1.91568e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.180 sec. to 0.820 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.255844 ( 0.255842 2.3652 ) Epeak [keV] : 145.625 ( -145.624 -145.624 ) Norm@50keV : 1.57215E-02 ( -0.00934313 0.0916144 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.47 using 59 PHA bins. # Reduced chi-squared = 1.098 for 56 degrees of freedom # Null hypothesis probability = 2.865506e-01 Photon flux (15-150 keV) in 1 sec: 0.870674 ( -0.224832 0.230356 ) ph/cm2/s Energy fluence (15-150 keV) : 8.30348e-08 ( -1.99826e-08 1.97503e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.54 sec. Hardness ratio (energy fluence ratio) = 2.12084928401
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.1913762e-08 S(50-150 keV) = 6.8901e-08
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 = 9.011113519456880E-01, IMY = 2.205721656682202E-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: -707.483400 -702.515600 -239.584000 0.008000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9754 -15.6399 0.2 27.5 -22.9 15.3557 70.4 0.2 Sco X-1 254.2558 35.2406 0.0 27.8 -162.6 0.2667 1.2 11.6 Her X-1 256.0367 -37.7610 4.6 51.5 -27.5 1.4290 2.5 5.5 4U 1700-377 256.3582 -36.5097 12.6 50.5 -28.4 0.4716 0.9 6.4 GX 349+2 262.9681 -24.8370 4.7 43.0 -43.0 0.9537 2.4 5.9 GX 1+4 268.3754 -1.3234 5.6 31.8 -78.9 0.6923 2.1 7.8 SW J1753.5-0127 270.2664 -25.0326 6.6 47.4 -50.0 -1.5161 -1.7 3.0 GX 5-1 270.1187 -25.8834 4.3 47.9 -49.1 2.4180 2.7 13.0 GRS 1758-258 273.8201 -14.1488 0.0 42.9 -64.8 -0.5277 -0.5 12.7 GX 17+2 262.8447 -33.8243 6.7 50.4 -36.1 1.1463 1.7 7.2 GX 354-0 200.4329 -15.1850 3.6 46.4 45.9 4.1539 3.3 ------ UNKNOWN 224.4864 0.8882 2.1 17.7 45.1 1.1106 5.3 ------ UNKNOWN 257.8279 28.9916 2.9 25.1 -148.2 0.8406 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.008000 0.632000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8760 -15.4779 7.4 27.3 -22.8 -0.0142 -1.6 11.4 Sco X-1 254.2676 35.2781 9.5 27.8 -162.7 0.0111 1.2 10.1 Her X-1 256.0733 -37.9798 0.0 51.7 -27.4 -0.0431 -1.8 9.1 4U 1700-377 256.5686 -36.4506 3.9 50.5 -28.6 0.0629 2.9 6.6 GX 349+2 263.1587 -24.7441 8.5 43.0 -43.3 0.0232 1.4 8.2 GX 1+4 268.4709 -1.3601 4.1 31.9 -78.9 0.0399 2.8 8.3 SW J1753.5-0127 270.4823 -24.9393 0.0 47.5 -50.3 -0.0298 -0.8 13.7 GX 5-1 270.4463 -25.7684 9.2 48.0 -49.5 0.0473 1.2 7.9 GRS 1758-258 274.1822 -13.9569 4.5 43.1 -65.3 0.0850 2.5 11.3 GX 17+2 262.9441 -33.7383 5.1 50.4 -36.3 0.0625 2.3 6.2 GX 354-0 208.9484 -33.5186 2.1 53.0 21.2 0.2769 5.6 ------ UNKNOWN 222.6614 -2.0968 2.4 20.9 41.3 0.0441 4.7 ------ UNKNOWN 241.7561 -31.5686 1.2 42.9 -13.8 0.1261 9.3 ------ UNKNOWN 274.5146 -1.7631 2.4 37.7 -82.3 0.1048 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 76.916600 198.116600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6529 -62.7647 115.0 46.5 18.7 -0.0373 -0.1 0.3 GX 301-2 244.9752 -15.6446 0.2 16.2 178.7 8.1255 63.2 0.4 Sco X-1 255.8330 -37.9741 81.9 13.2 -69.7 -0.0199 -0.1 10.7 4U 1700-377 256.3093 -36.2693 10.2 12.9 -77.3 0.1645 1.1 11.1 GX 349+2 262.9573 -24.7431 3.8 19.9 -117.3 0.4258 3.0 2.8 GX 1+4 264.8951 -44.3008 9.7 22.1 -60.8 -0.1907 -1.2 11.1 4U 1735-44 268.4969 -1.4928 4.2 39.3 -147.2 0.5544 2.8 8.1 SW J1753.5-0127 270.1241 -25.1461 6.6 25.7 -109.8 0.2801 1.7 9.6 GX 5-1 270.3021 -25.8343 5.0 25.6 -108.2 0.3816 2.3 5.5 GRS 1758-258 273.9909 -14.0359 4.1 34.3 -125.8 0.5756 2.8 0.9 GX 17+2 275.8535 -30.4989 9.2 29.1 -95.6 0.2326 1.3 8.7 H1820-303 285.0077 -25.0427 16.2 38.4 -101.1 0.3153 0.7 7.5 HT1900.1-2455 262.8899 -33.9650 10.8 17.9 -89.2 0.1604 1.1 9.3 GX 354-0 208.0275 -19.6885 3.2 32.5 90.7 1.0729 3.6 ------ UNKNOWN 240.1327 -4.8612 2.8 26.8 163.9 0.6320 4.1 ------ UNKNOWN 255.2242 -41.6543 1.9 14.7 -55.6 0.8417 6.3 ------ UNKNOWN 259.2468 4.2094 2.0 39.5 -164.4 1.0292 5.7 ------ UNKNOWN 255.8936 -46.0603 2.1 18.1 -45.5 0.7573 5.5 ------ UNKNOWN 276.6661 -77.8823 2.6 48.8 -21.7 1.1703 4.5 ------ UNKNOWN 279.2583 11.2376 2.3 55.9 -146.3 4.3295 4.9 ------ UNKNOWN 289.7418 -29.5864 2.2 41.0 -92.3 2.9395 5.1 ------ UNKNOWN