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 May 23 21:50:33 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger345551
======================================================================
Trigger: 00345551 Segment: 000
BAT Trigger Time: 258090402.432 [s; MET]
Trigger Stop: 258090414.592 [s; MET]
UTC: 2009-03-07T03:46:37.877980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.979295086239 Dec: -28.6441582093691 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.73
Image Trigger?: NO
Rate S/N Ratio: 10.3923048454133 [ if not an image trigger ]
Image S/N Ratio: 5.73
Analysis Position: [ source = BAT ]
RA: 244.979295086239 Dec: -28.6441582093691 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 244.969142654586 Dec: -28.6657018334008 [deg; J2000]
{ 16h 19m 52.6s , -28d 39' 56.5" }
+/- 3.06080309952171 [arcmin] (estimated 90% radius based on SNR)
+/- 1.69815987424359 [arcmin] (formal 1-sigma fit error)
SNR: 6.15272946070803
Angular difference between the analysis and refined position is 1.398783 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 22 +/- 6.40312423743285
Measured from: -7.43200001120567
to: 14.5679999887943 [s; relative to TRIGTIME]
T50: 12 +/- 8.60232526704263
Measured from: -2.43200001120567
to: 9.56799998879433 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.56799998879433
to: 6.56799998879433 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.43200001120567
to: 16.5679999887943 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.066525 0.122082 0.111408 0.047047
0.030098 0.028331 0.024587 0.022300 [error]
Peak 0.007867 0.016457 0.004152 -0.001405
0.006193 0.005892 0.004971 0.004618 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 24.000 -7.432 16.568
T90 22.000 -7.432 14.568
T50 12.000 -2.432 9.568
Peak 1.000 5.568 6.568
====== 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 -0.985 -0.390 0.430 - - - 1.02e-03 -2.33e-04 2.28e-04 60.320 57
CPL -0.528 0.528 6.220 175.781 -175.781 -175.781 1.67e-03 -8.54e-04 1.16e+00 60.230 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 -1.549 -1.005 1.078 - - - 2.13e-03 -2.13e-03 1.11e-03 50.790 57
CPL -1.245 N/A N/A 97.476 N/A N/A 3.27e-03 N/A N/A 50.860 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 1.94e-08 4.89e-08 9.88e-08 5.02e-07 2.67e-07 6.69e-07 erg/cm2
90%_error_low -8.53e-09 -1.42e-08 -2.32e-08 -2.27e-07 -6.05e-08 -2.42e-07 erg/cm2
90%_error_hi 1.02e-08 1.37e-08 2.28e-08 3.54e-07 6.12e-08 3.54e-07 erg/cm2
Peak flux PL 9.18e-02 8.97e-02 6.13e-02 6.58e-02 2.69e-01 3.09e-01 ph/cm2/s
90%_error_low -6.94e-02 -8.97e-02 -3.98e-02 -6.58e-02 -1.38e-01 -1.57e-01 ph/cm2/s
90%_error_hi 8.46e-02 4.73e-02 4.08e-02 1.59e-01 1.39e-01 1.61e-01 ph/cm2/s
Fluence CPL 1.76e-08 5.05e-08 1.02e-07 2.78e-07 2.58e-07 4.36e-07 erg/cm2
90%_error_low -1.41e-08 -1.50e-08 -2.63e-08 N/A -1.04e-07 -2.82e-07 erg/cm2
90%_error_hi 1.17e-08 1.88e-08 2.99e-08 N/A 6.83e-08 3.13e-07 erg/cm2
Peak flux CPL 9.22e-02 8.96e-02 6.12e-02 6.62e-02 2.70e-01 3.15e-01 ph/cm2/s
90%_error_low -9.22e-02 -5.01e-02 -3.97e-02 -6.62e-02 -1.38e-01 -3.15e-01 ph/cm2/s
90%_error_hi 8.44e-02 1.28e-01 4.25e-02 1.56e-01 1.38e-01 1.51e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 244.9691 -28.6657 0.0311 22.3960 164.0388 0.3714940 6.153 TRIG_00345551 Foreground time interval of the image: -7.432 16.568 (delta_t = 24.000 [sec]) Background time interval of the image: -486.331 -447.371 (delta_t = 38.961 [sec]) -60.432 -7.432 (delta_t = 53.000 [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 -7.432 sec. to 16.568 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.985495 ( -0.390256 0.430372 ) Norm@50keV : 1.02220E-03 ( -0.00023269 0.000227739 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.32 using 59 PHA bins. # Reduced chi-squared = 1.058 for 57 degrees of freedom # Null hypothesis probability = 3.568124e-01 Photon flux (15-150 keV) in 24 sec: 0.117601 ( -0.0268789 0.027244 ) ph/cm2/s Energy fluence (15-150 keV) : 2.66686e-07 ( -6.0546e-08 6.1169e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.432 sec. to 16.568 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.528236 ( 0.539693 6.23104 ) Epeak [keV] : 175.781 ( -181.767 -181.767 ) Norm@50keV : 1.66579E-03 ( -0.00080765 1.1596 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.23 using 59 PHA bins. # Reduced chi-squared = 1.075 for 56 degrees of freedom # Null hypothesis probability = 3.254756e-01 Photon flux (15-150 keV) in 24 sec: 0.115202 ( -0.0373882 0.028633 ) ph/cm2/s Energy fluence (15-150 keV) : 2.58293e-07 ( -1.04065e-07 6.82584e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.568 sec. to 6.568 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54926 ( -1.00501 1.07766 ) Norm@50keV : 2.12660E-03 ( -0.0021266 0.00111089 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.79 using 59 PHA bins. # Reduced chi-squared = 0.8910 for 57 degrees of freedom # Null hypothesis probability = 7.058076e-01 Photon flux (15-150 keV) in 1 sec: 0.269164 ( -0.137816 0.138954 ) ph/cm2/s Energy fluence (15-150 keV) : 2.00249e-08 ( -1.1038e-08 1.19302e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.568 sec. to 6.568 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 8.21465 ( ) Epeak [keV] : 33.3942 ( ) Norm@50keV : 5829.91 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.98 using 59 PHA bins. # Reduced chi-squared = 0.8924 for 56 degrees of freedom # Null hypothesis probability = 7.010299e-01 Photon flux (15-150 keV) in 1 sec: 0.269700 ( -0.138376 0.138307 ) ph/cm2/s Energy fluence (15-150 keV) : 2.01363e-08 ( -1.46879e-08 5.92284e-09 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 22.0 sec. Hardness ratio (energy fluence ratio) = 2.02017994517
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.830684e-08 S(50-150 keV) = 1.9838294e-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 = -3.962020593369289E-01, IMY = -1.133190881750955E-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: -486.331400 -447.370700 -60.432000 -7.432000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4068 -60.5058 3.4 40.3 29.7 0.7795 3.4 7.5 Cen X-3 186.6660 -62.7857 2.0 32.3 29.1 0.9316 5.7 1.0 GX 301-2 244.9610 -15.6570 0.5 35.4 163.7 3.7822 23.6 1.5 Sco X-1 256.0107 -37.8797 1.0 15.5 -160.9 1.1634 11.5 2.4 4U 1700-377 256.4215 -36.2916 4.4 17.1 -162.4 0.2857 2.6 7.9 GX 349+2 262.8921 -24.8727 4.6 29.8 -161.9 0.3093 2.5 9.9 GX 1+4 264.8462 -44.6006 6.6 15.1 -124.6 0.1973 1.8 10.1 4U 1735-44 268.2687 -1.3251 8.8 53.7 -167.1 -0.3891 -1.3 9.7 SW J1753.5-0127 270.2953 -25.2051 4.8 32.6 -150.0 0.3156 2.4 7.6 GX 5-1 270.1506 -25.6931 7.2 32.1 -149.8 0.2151 1.7 8.7 GRS 1758-258 274.0346 -14.0327 3.1 44.1 -153.6 0.7554 3.7 1.7 GX 17+2 275.9299 -30.3708 27.1 31.2 -136.7 0.0616 0.4 0.3 H1820-303 285.0766 -24.7884 5.3 40.6 -131.9 -0.4672 -2.2 8.2 HT1900.1-2455 262.8166 -33.8629 16.0 21.8 -152.3 0.0843 0.7 8.8 GX 354-0 197.7887 -33.3421 2.5 38.0 82.2 1.7378 4.7 ------ UNKNOWN 162.5716 -75.4697 2.6 39.2 5.9 0.7461 4.4 ------ UNKNOWN 217.5123 -74.2267 3.6 25.7 -0.8 0.3563 3.2 ------ UNKNOWN 20.9700 -84.0593 3.4 43.4 -23.2 0.5900 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -7.432000 16.568000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.0191 -60.5350 0.0 40.5 29.6 -0.0659 -0.6 10.2 Cen X-3 186.8792 -62.6227 4.7 32.2 29.4 0.2014 2.4 10.8 GX 301-2 245.1304 -15.5500 6.2 35.5 163.9 0.1562 1.9 10.3 Sco X-1 255.9170 -37.7343 12.3 15.6 -161.4 0.0474 0.9 7.4 4U 1700-377 256.5342 -36.5879 5.1 16.9 -161.7 0.1171 2.3 11.0 GX 349+2 263.0070 -24.7462 9.6 29.9 -161.8 0.0704 1.2 0.1 GX 1+4 264.9511 -44.4320 7.7 15.2 -125.0 0.0862 1.5 9.0 4U 1735-44 268.3874 -1.4154 6.7 53.6 -166.9 -0.2572 -1.7 2.5 SW J1753.5-0127 270.2494 -25.0365 17.9 32.7 -150.2 -0.0426 -0.6 3.2 GX 5-1 270.1433 -25.5867 121.3 32.2 -149.9 -0.0064 -0.1 12.7 GRS 1758-258 274.1232 -14.0040 4.0 44.1 -153.5 -0.2778 -2.8 7.1 GX 17+2 275.9298 -30.3647 1453.1 31.2 -136.7 -0.0005 -0.0 0.3 H1820-303 284.9693 -25.0053 21.5 40.4 -131.8 -0.0546 -0.5 6.2 HT1900.1-2455 263.0674 -33.9903 5.7 21.8 -151.6 0.1120 2.0 10.1 GX 354-0 234.0167 -22.2664 2.6 29.9 143.2 0.3516 4.5 ------ UNKNOWN 244.9672 -28.6639 1.9 22.4 164.0 0.3673 6.1 ------ UNKNOWN 255.4341 5.2585 3.0 57.1 175.9 1.2995 3.8 ------ UNKNOWN 288.7881 -48.6808 2.4 28.3 -94.4 0.3801 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 111.068600 302.640400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.7720 -62.8269 4.6 50.4 19.6 1.5201 2.5 4.6 GX 301-2 244.9780 -15.6524 0.2 13.0 169.3 9.4495 58.6 0.7 Sco X-1 255.9845 -37.8325 0.9 13.0 -52.7 2.1885 12.8 0.7 4U 1700-377 256.3987 -36.4376 2.5 12.4 -58.6 0.7913 4.7 2.0 GX 349+2 263.1519 -24.7006 4.8 16.7 -110.1 0.4270 2.4 8.2 GX 1+4 264.8540 -44.3546 8.2 22.3 -50.5 0.2752 1.4 7.4 4U 1735-44 268.4094 -1.4358 2.5 35.2 -147.1 1.0955 4.7 2.7 SW J1753.5-0127 270.1694 -25.0709 4.0 22.7 -103.8 0.6198 2.9 6.3 GX 5-1 270.2889 -25.7151 5.5 22.6 -102.1 0.4549 2.1 1.8 GRS 1758-258 274.0226 -14.0510 1.9 30.6 -123.0 1.4505 6.0 1.3 GX 17+2 275.9024 -30.2926 5.5 26.9 -89.5 0.5109 2.1 4.6 H1820-303 285.0249 -25.0154 7.8 35.7 -96.9 0.6320 1.5 5.7 HT1900.1-2455 262.8379 -33.9419 3.6 16.1 -77.0 0.6009 3.2 9.9 GX 354-0 236.2977 18.0352 1.9 47.4 158.1 3.3628 6.3 ------ UNKNOWN 257.8501 28.2787 4.0 58.2 -177.3 3.5400 2.9 ------ UNKNOWN 255.7377 -48.8419 2.4 21.8 -29.9 0.8357 4.9 ------ UNKNOWN 312.6332 -69.5492 2.6 55.5 -33.7 4.5388 4.4 ------ UNKNOWN