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 18:27:20 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger345777
======================================================================
Trigger: 00345777 Segment: 000
BAT Trigger Time: 258228088 [s; MET]
Trigger Stop: 258228152 [s; MET]
UTC: 2009-03-08T18:01:23.441660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 183.526014699304 Dec: -48.8329591097236 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.92
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.92
Analysis Position: [ source = BAT ]
RA: 183.526014699304 Dec: -48.8329591097236 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 183.504494783963 Dec: -48.7285990877751 [deg; J2000]
{ 12h 14m 01.1s , -48d 43' 43.0" }
+/- 2.39511017607746 [arcmin] (estimated 90% radius based on SNR)
+/- 1.48454993146122 [arcmin] (formal 1-sigma fit error)
SNR: 8.73423382659895
Angular difference between the analysis and refined position is 6.319141 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 25.0959999859333 +/- 5.86202596421854
Measured from: 17.1240000128746
to: 42.2199999988079 [s; relative to TRIGTIME]
T50: 12.5160000026226 +/- 6.54216722789276
Measured from: 25.2680000066757
to: 37.7840000092983 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.5920000076294
to: 17.5920000076294 [s; relative to TRIGTIME]
Total Fluence
Measured from: 16.5959999859333
to: 45.3560000061989 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.257635 0.163587 0.057186 0.004593
0.029542 0.029078 0.024654 0.021992 [error]
Peak 0.021188 0.016567 0.005745 0.001051
0.005395 0.005457 0.004561 0.003942 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 28.760 16.596 45.356
T90 25.096 17.124 42.220
T50 12.516 25.268 37.784
Peak 1.000 16.592 17.592
====== 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 -2.335 -0.363 0.318 - - - 7.97e-04 -2.10e-04 2.08e-04 58.460 57
CPL -1.089 -0.914 1.878 26.671 N/A N/A 4.84e-03 N/A N/A 56.010 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 -2.186 -0.807 0.612 - - - 2.03e-03 -1.11e-03 1.04e-03 38.870 57
CPL -0.114 -2.029 5.691 35.515 N/A N/A 3.64e-02 N/A N/A 37.300 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 6.45e-08 7.16e-08 5.68e-08 7.44e-08 2.21e-07 2.67e-07 erg/cm2
90%_error_low -1.28e-08 -1.34e-08 -1.92e-08 -3.87e-08 -4.60e-08 -6.97e-08 erg/cm2
90%_error_hi 1.30e-08 1.31e-08 2.11e-08 6.05e-08 4.86e-08 8.66e-08 erg/cm2
Peak flux PL 1.63e-01 1.09e-01 4.81e-02 2.92e-02 3.34e-01 3.49e-01 ph/cm2/s
90%_error_low -6.98e-02 -4.25e-02 -2.96e-02 -2.92e-02 -1.21e-01 -1.28e-01 ph/cm2/s
90%_error_hi 7.35e-02 4.12e-02 3.40e-02 4.99e-02 1.21e-01 1.31e-01 ph/cm2/s
Fluence CPL 6.16e-08 8.24e-08 4.72e-08 9.89e-09 1.99e-07 2.01e-07 erg/cm2
90%_error_low -1.42e-08 N/A -2.43e-08 N/A -4.23e-08 -4.38e-08 erg/cm2
90%_error_hi 1.39e-08 N/A 2.54e-08 N/A 5.05e-08 4.90e-08 erg/cm2
Peak flux CPL 1.40e-01 1.41e-01 4.27e-02 2.68e-03 3.27e-01 3.28e-01 ph/cm2/s
90%_error_low -1.40e-01 -5.91e-02 -4.27e-02 -2.68e-03 -1.17e-01 -1.19e-01 ph/cm2/s
90%_error_hi 8.35e-02 6.31e-02 4.11e-02 2.71e-02 1.19e-01 1.19e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 183.5045 -48.7286 0.0222 15.1478 133.3729 0.4699268 8.734 TRIG_00345777 Foreground time interval of the image: 16.596 45.356 (delta_t = 28.760 [sec]) Background time interval of the image: -239.000 16.596 (delta_t = 255.596 [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 16.596 sec. to 45.356 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.33531 ( -0.362588 0.317951 ) Norm@50keV : 7.96745E-04 ( -0.000210218 0.000207722 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.46 using 59 PHA bins. # Reduced chi-squared = 1.026 for 57 degrees of freedom # Null hypothesis probability = 4.216588e-01 Photon flux (15-150 keV) in 28.76 sec: 0.142047 ( -0.023419 0.023423 ) ph/cm2/s Energy fluence (15-150 keV) : 2.20505e-07 ( -4.60439e-08 4.85917e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.596 sec. to 45.356 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.08905 ( -0.913749 1.87865 ) Epeak [keV] : 26.6712 ( ) Norm@50keV : 4.84130E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.01 using 59 PHA bins. # Reduced chi-squared = 1.000 for 56 degrees of freedom # Null hypothesis probability = 4.746051e-01 Photon flux (15-150 keV) in 28.76 sec: 0.138746 ( -0.023156 0.02335 ) ph/cm2/s Energy fluence (15-150 keV) : 1.99369e-07 ( -4.23155e-08 5.04859e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 16.592 sec. to 17.592 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.18589 ( -0.806212 0.612254 ) Norm@50keV : 2.03427E-03 ( -0.00110723 0.001044 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.87 using 59 PHA bins. # Reduced chi-squared = 0.6819 for 57 degrees of freedom # Null hypothesis probability = 9.683385e-01 Photon flux (15-150 keV) in 1 sec: 0.334328 ( -0.120869 0.121091 ) ph/cm2/s Energy fluence (15-150 keV) : 1.90902e-08 ( -8.32505e-09 9.2159e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.592 sec. to 17.592 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.114238 ( -2.0602 5.65999 ) Epeak [keV] : 35.5147 ( ) Norm@50keV : 3.63737E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.30 using 59 PHA bins. # Reduced chi-squared = 0.6661 for 56 degrees of freedom # Null hypothesis probability = 9.743356e-01 Photon flux (15-150 keV) in 1 sec: 0.326560 ( -0.117062 0.119376 ) ph/cm2/s Energy fluence (15-150 keV) : 1.71803e-08 ( -6.83507e-09 8.67443e-09 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 25.096 sec. Hardness ratio (energy fluence ratio) = 0.792665452456
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.361566e-07 S(50-150 keV) = 8.435674e-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 = -1.859131598750296E-01, IMY = -1.967837481636095E-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: -239.000000 16.596000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5197 -40.5701 1.1 29.8 37.4 2.8002 10.9 1.0 Vela X-1 170.3605 -60.6176 1.3 1.3 101.0 1.6112 9.1 1.4 Cen X-3 186.6272 -62.7696 0.5 7.6 -158.6 4.4806 21.9 0.8 GX 301-2 255.9050 -37.7924 3.7 55.3 -155.4 2.2036 3.1 5.0 4U 1700-377 256.5776 -36.6159 0.0 56.6 -155.7 0.8626 0.9 13.4 GX 349+2 264.5853 -44.4697 27.5 53.7 -144.1 0.5616 0.4 6.9 4U 1735-44 54.4749 -55.7975 3.9 52.1 -42.1 3.4913 3.0 ------ UNKNOWN 346.3524 -77.0459 3.7 41.0 -83.4 2.6201 3.1 ------ UNKNOWN 299.2591 -72.0516 4.0 41.6 -103.2 2.6089 2.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 16.596000 45.356000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4966 -40.4914 3.2 29.9 37.5 -0.2918 -3.6 4.1 Vela X-1 170.0103 -60.6340 4.1 1.3 93.5 -0.1468 -2.8 9.0 Cen X-3 186.4065 -62.6872 4.6 7.5 -159.2 0.1243 2.5 8.5 GX 301-2 256.0025 -37.8259 4.4 55.4 -155.3 0.5478 2.6 1.3 4U 1700-377 256.3326 -36.4883 6.8 56.6 -156.0 0.4039 1.7 6.3 GX 349+2 264.7404 -44.4489 39.6 53.7 -144.0 -0.0770 -0.3 0.1 4U 1735-44 183.5044 -48.7287 1.3 15.1 133.4 0.4693 8.7 ------ UNKNOWN 129.8112 -48.8497 2.4 25.8 19.5 0.3043 4.9 ------ UNKNOWN 251.2813 -43.3674 2.9 48.8 -154.8 0.4789 3.9 ------ UNKNOWN 259.2209 -35.1773 2.1 59.0 -154.5 1.9919 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 110.900600 673.000610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5532 -40.5407 1.0 34.5 13.2 4.8082 11.2 1.4 Vela X-1 170.3621 -60.6217 1.1 14.0 -44.8 3.4424 10.9 1.4 Cen X-3 186.6437 -62.7663 0.4 14.0 -78.2 9.9555 30.6 0.4 GX 301-2 255.9606 -37.8494 1.4 51.8 -145.7 8.2832 8.5 1.3 4U 1700-377 256.5325 -36.4322 8.0 53.0 -146.8 1.6898 1.4 4.7 GX 349+2 132.6568 -32.2269 3.5 41.2 22.1 1.9105 3.3 ------ UNKNOWN 126.7688 -42.5779 3.0 39.2 4.8 1.9368 3.9 ------ UNKNOWN 149.3371 -53.5896 3.6 21.7 -7.9 0.9935 3.2 ------ UNKNOWN 242.8682 -17.2189 3.2 57.1 -174.1 5.0713 3.6 ------ UNKNOWN 170.0914 -61.9205 2.0 15.1 -47.5 1.7968 5.7 ------ UNKNOWN 239.4215 -25.4241 2.2 49.0 -169.8 3.2107 5.2 ------ UNKNOWN 242.7998 -30.5108 2.8 47.8 -162.1 2.7449 4.1 ------ UNKNOWN 94.6153 -59.0313 3.3 49.3 -29.6 2.4970 3.5 ------ UNKNOWN 84.1172 -51.2082 3.7 58.7 -26.0 7.2855 3.1 ------ UNKNOWN 78.3012 -65.7411 4.8 52.0 -42.1 4.9210 2.4 ------ UNKNOWN 261.7299 -57.9087 3.0 44.8 -119.9 5.3653 3.9 ------ UNKNOWN 268.6422 -82.6462 3.9 41.1 -83.5 4.5555 3.0 ------ UNKNOWN