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: Mon Jan 20 07:57:25 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger287088
======================================================================
Trigger: 00287088 Segment: 000
BAT Trigger Time: 208036547.584 [s; MET]
Trigger Stop: 208036551.68 [s; MET]
UTC: 2007-08-05T19:55:45.448360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.043192352659 Dec: -59.9448796085781 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.19
Image Trigger?: NO
Rate S/N Ratio: 11.3137084989848 [ if not an image trigger ]
Image S/N Ratio: 9.19
Analysis Position: [ source = BAT ]
RA: 245.043192352659 Dec: -59.9448796085781 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 245.042046748349 Dec: -59.9590092901461 [deg; J2000]
{ 16h 20m 10.1s , -59d 57' 32.4" }
+/- 1.39634729023887 [arcmin] (estimated 90% radius based on SNR)
+/- 0.485727300988602 [arcmin] (formal 1-sigma fit error)
SNR: 18.8792564092908
Angular difference between the analysis and refined position is 0.848479 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 26.4320000112057 +/- 3.11137784326295
Measured from: 0.596000015735626
to: 27.0280000269413 [s; relative to TRIGTIME]
T50: 16.0920000076294 +/- 1.83535499321479
Measured from: 4.07600000500679
to: 20.1680000126362 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.2320000231266
to: 4.2320000231266 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.843999981880188
to: 28.6680000126362 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.394579 0.396959 0.288202 0.134219
0.033590 0.035124 0.031078 0.026836 [error]
Peak 0.017039 0.028852 0.023277 0.012792
0.006230 0.006632 0.006046 0.004995 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 29.512 -0.844 28.668
T90 26.432 0.596 27.028
T50 16.092 4.076 20.168
Peak 1.000 3.232 4.232
====== 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 -1.732 -0.184 0.180 - - - 2.60e-03 -2.61e-04 2.56e-04 55.650 57
CPL -1.728 -0.188 0.187 9999.360 -9999.350 -9999.360 2.60e-03 -2.22e-03 -1.01e-03 55.670 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 -1.337 -0.420 0.430 - - - 5.53e-03 -1.32e-03 1.32e-03 44.000 57
CPL -1.301 N/A N/A 952.084 N/A N/A 5.78e-03 N/A N/A 44.020 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 1.22e-07 1.94e-07 2.34e-07 5.50e-07 7.08e-07 1.10e-06 erg/cm2
90%_error_low -1.85e-08 -1.76e-08 -3.29e-08 -1.50e-07 -7.39e-08 -1.80e-07 erg/cm2
90%_error_hi 1.91e-08 1.75e-08 3.28e-08 1.85e-07 7.49e-08 2.07e-07 erg/cm2
Peak flux PL 1.95e-01 2.16e-01 1.71e-01 2.23e-01 6.64e-01 8.05e-01 ph/cm2/s
90%_error_low -8.11e-02 -6.02e-02 -4.90e-02 -1.09e-01 -1.64e-01 -1.95e-01 ph/cm2/s
90%_error_hi 9.14e-02 5.79e-02 4.75e-02 1.60e-01 1.64e-01 1.98e-01 ph/cm2/s
Fluence CPL 1.13e-07 1.58e-07 1.70e-07 4.14e-07 5.51e-07 8.51e-07 erg/cm2
90%_error_low -2.62e-08 -3.33e-08 -1.67e-08 -7.38e-08 -6.56e-08 -1.59e-07 erg/cm2
90%_error_hi 2.02e-08 2.24e-08 1.38e-08 5.12e-08 5.10e-08 1.32e-07 erg/cm2
Peak flux CPL 1.99e-01 2.15e-01 1.70e-01 2.49e-01 6.67e-01 8.32e-01 ph/cm2/s
90%_error_low -1.99e-01 -3.01e-02 -4.82e-02 N/A -1.76e-01 -2.37e-01 ph/cm2/s
90%_error_hi 9.96e-02 6.82e-02 5.68e-02 N/A 1.71e-01 1.71e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 245.0420 -59.9590 0.0102 35.6576 -32.5120 1.2728908 18.879 TRIG_00287088 Foreground time interval of the image: -0.844 28.668 (delta_t = 29.512 [sec]) Background time interval of the image: -239.584 -0.844 (delta_t = 238.740 [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 -0.844 sec. to 28.668 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.73242 ( -0.183772 0.179588 ) Norm@50keV : 2.59876E-03 ( -0.000261476 0.000255731 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.65 using 59 PHA bins. # Reduced chi-squared = 0.9763 for 57 degrees of freedom # Null hypothesis probability = 5.259207e-01 Photon flux (15-150 keV) in 29.51 sec: 0.349162 ( -0.031868 0.031936 ) ph/cm2/s Energy fluence (15-150 keV) : 7.085e-07 ( -7.3901e-08 7.48562e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.844 sec. to 28.668 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.73184 ( -0.188146 0.187287 ) Epeak [keV] : 235.616 ( -9999.35 -9999.36 ) Norm@50keV : 8.55076E-04 ( -0.000470272 0.00074168 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.92 using 59 PHA bins. # Reduced chi-squared = 0.8736 for 56 degrees of freedom # Null hypothesis probability = 7.374035e-01 Photon flux (15-150 keV) in 29.51 sec: 0.350970 ( -0.037235 0.033646 ) ph/cm2/s Energy fluence (15-150 keV) : 5.51023e-07 ( -6.55783e-08 5.09534e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.232 sec. to 4.232 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33732 ( -0.419969 0.430437 ) Norm@50keV : 5.52698E-03 ( -0.00131661 0.00131505 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.00 using 59 PHA bins. # Reduced chi-squared = 0.7719 for 57 degrees of freedom # Null hypothesis probability = 8.964000e-01 Photon flux (15-150 keV) in 1 sec: 0.664139 ( -0.163701 0.164384 ) ph/cm2/s Energy fluence (15-150 keV) : 5.41427e-08 ( -1.40588e-08 1.41918e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.232 sec. to 4.232 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.30083 ( ) Epeak [keV] : 952.084 ( ) Norm@50keV : 5.78112E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.02 using 59 PHA bins. # Reduced chi-squared = 0.7860 for 56 degrees of freedom # Null hypothesis probability = 8.771014e-01 Photon flux (15-150 keV) in 1 sec: 0.666704 ( -0.176406 0.170814 ) ph/cm2/s Energy fluence (15-150 keV) : 5.44616e-08 ( -1.56662e-08 1.27555e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 26.432 sec. Hardness ratio (energy fluence ratio) = 1.20378742349
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.161858e-07 S(50-150 keV) = 3.923092e-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 = 6.050113605532932E-01, IMY = 3.856135393564443E-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: -239.584000 -0.844000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9305 -37.9624 50.6 47.0 -1.6 -0.0822 -0.2 7.6 4U 1700-377 256.4966 -36.3399 3.0 48.0 0.2 1.4893 3.9 5.8 GX 349+2 264.7101 -44.2727 18.0 37.9 0.4 -0.1528 -0.6 10.7 4U 1735-44 270.3716 -25.0268 5.2 51.3 21.3 -1.6715 -2.2 5.7 GX 5-1 270.2500 -25.6922 6.0 50.8 20.8 1.3686 1.9 4.2 GRS 1758-258 275.9595 -30.2517 10.0 44.4 23.8 0.4454 1.2 7.1 H1820-303 285.0628 -25.0251 9.4 45.4 37.3 0.7109 1.2 6.4 HT1900.1-2455 263.1322 -33.8071 9.2 47.0 8.2 0.4440 1.3 7.3 GX 354-0 18.6545 -54.3013 2.0 28.9 -170.7 0.9633 5.9 ------ UNKNOWN 40.8503 -30.7925 2.9 57.1 -175.4 3.4953 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.844000 28.668000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.0201 -37.8940 71.5 47.0 -1.5 0.0172 0.2 3.4 4U 1700-377 256.4675 -36.3922 4.0 48.0 0.1 -0.3126 -2.9 2.4 GX 349+2 264.8678 -44.5474 5.9 37.6 0.2 0.1417 2.0 7.9 4U 1735-44 270.3208 -25.0691 5.5 51.3 21.2 0.5530 2.1 2.1 GX 5-1 270.1807 -25.6483 56.3 50.9 20.7 0.0490 0.2 8.7 GRS 1758-258 275.9810 -30.5261 0.0 44.1 23.6 0.1359 1.1 10.0 H1820-303 284.9860 -25.0086 4.1 45.5 37.2 -0.5042 -2.8 5.9 HT1900.1-2455 262.9035 -33.9097 9.6 47.1 7.9 -0.1372 -1.2 6.2 GX 354-0 287.4469 -22.2015 1.8 47.2 41.6 1.5921 6.4 ------ UNKNOWN 245.0420 -59.9590 0.6 35.7 -32.5 1.2729 18.9 ------ UNKNOWN 126.2418 -76.1182 2.2 41.0 -96.3 1.1835 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 199.516600 962.488700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2899 -60.6135 11.6 58.1 -25.1 2.6048 1.0 0.9 Cen X-3 258.4259 -68.0117 2.0 52.7 17.9 9.0193 5.8 ------ UNKNOWN