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 Jun 22 16:57:03 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger312242
======================================================================
Trigger: 00312242 Segment: 000
BAT Trigger Time: 233270514.112 [s; MET]
Trigger Stop: 233270517.184 [s; MET]
UTC: 2008-05-23T21:21:51.299440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 20.7319456343948 Dec: -64.0535352908149 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: NO
Rate S/N Ratio: 11.2249721603218 [ if not an image trigger ]
Image S/N Ratio: 7
Analysis Position: [ source = BAT ]
RA: 20.7319456343948 Dec: -64.0535352908149 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 20.7698948126746 Dec: -64.0522452233304 [deg; J2000]
{ 01h 23m 04.8s , -64d 03' 08.1" }
+/- 1.84240035623572 [arcmin] (estimated 90% radius based on SNR)
+/- 0.921638007230186 [arcmin] (formal 1-sigma fit error)
SNR: 12.7056932838099
Angular difference between the analysis and refined position is 0.999262 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: -15.1119999885559
to: 32.8880000114441 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.888000011444092
to: 16.8880000114441 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.38800001144409
to: 9.38800001144409 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.1119999885559
to: 32.8880000114441 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.278569 0.406990 0.407655 0.083012
0.031531 0.033154 0.029413 0.024890 [error]
Peak 0.006812 0.020349 0.007820 -0.003491
0.004586 0.004803 0.004362 0.003729 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 48.000 -15.112 32.888
T90 48.000 -15.112 32.888
T50 16.000 0.888 16.888
Peak 1.000 8.388 9.388
====== 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: 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 -1.271 -0.136 0.136 - - - 1.61e-03 -1.29e-04 1.29e-04 77.390 57
CPL -0.431 -0.584 0.680 97.630 -22.758 97.381 4.09e-03 -1.92e-03 4.36e-03 71.000 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 -1.501 -0.588 0.556 - - - 2.26e-03 -9.03e-04 8.90e-04 65.630 57
CPL 1.556 -2.855 -1.556 48.303 -15.806 94.776 1.29e-01 -1.29e-01 2.64e+04 62.120 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 7.95e-08 1.68e-07 2.78e-07 1.05e-06 7.67e-07 1.57e-06 erg/cm2
90%_error_low -1.12e-08 -1.48e-08 -2.76e-08 -2.09e-07 -6.88e-08 -2.30e-07 erg/cm2
90%_error_hi 1.16e-08 1.47e-08 2.74e-08 2.42e-07 6.95e-08 2.58e-07 erg/cm2
Peak flux PL 9.32e-02 9.38e-02 6.63e-02 7.44e-02 2.83e-01 3.28e-01 ph/cm2/s
90%_error_low -4.66e-02 -3.57e-02 -3.11e-02 -7.44e-02 -1.06e-01 -1.26e-01 ph/cm2/s
90%_error_hi 5.30e-02 3.56e-02 3.23e-02 8.72e-02 1.06e-01 1.31e-01 ph/cm2/s
Fluence CPL 6.74e-08 1.81e-07 2.96e-07 3.66e-07 7.24e-07 9.10e-07 erg/cm2
90%_error_low -1.39e-08 -1.76e-08 -3.15e-08 -1.69e-07 -7.51e-08 -1.82e-07 erg/cm2
90%_error_hi 1.42e-08 1.81e-08 3.21e-08 3.61e-07 7.59e-08 3.59e-07 erg/cm2
Peak flux CPL 6.70e-02 1.36e-01 5.49e-02 2.02e-03 2.60e-01 2.60e-01 ph/cm2/s
90%_error_low -5.06e-02 -5.71e-02 -5.49e-02 -2.02e-03 -1.01e-01 -1.02e-01 ph/cm2/s
90%_error_hi 5.98e-02 6.53e-02 5.28e-02 5.96e-02 1.08e-01 1.11e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 20.7699 -64.0522 0.0152 9.6990 -170.7357 1.1207534 12.706 TRIG_00312242 Foreground time interval of the image: -15.112 32.888 (delta_t = 48.000 [sec]) Background time interval of the image: -48.211 -15.112 (delta_t = 33.099 [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 -15.112 sec. to 32.888 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27131 ( -0.135697 0.136371 ) Norm@50keV : 1.60604E-03 ( -0.000128972 0.000128897 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 77.39 using 59 PHA bins. # Reduced chi-squared = 1.358 for 57 degrees of freedom # Null hypothesis probability = 3.744407e-02 Photon flux (15-150 keV) in 48 sec: 0.190631 ( -0.01554 0.015558 ) ph/cm2/s Energy fluence (15-150 keV) : 7.67347e-07 ( -6.88234e-08 6.94714e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.112 sec. to 32.888 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.430541 ( -0.584062 0.680254 ) Epeak [keV] : 97.6302 ( -22.7582 97.3806 ) Norm@50keV : 4.09382E-03 ( -0.0019186 0.00435507 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.00 using 59 PHA bins. # Reduced chi-squared = 1.268 for 56 degrees of freedom # Null hypothesis probability = 8.547481e-02 Photon flux (15-150 keV) in 48 sec: 0.183598 ( -0.016396 0.016309 ) ph/cm2/s Energy fluence (15-150 keV) : 7.23571e-07 ( -7.50994e-08 7.58789e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.388 sec. to 9.388 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.50087 ( -0.58848 0.555485 ) Norm@50keV : 2.26310E-03 ( -0.000902655 0.000889662 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.63 using 59 PHA bins. # Reduced chi-squared = 1.151 for 57 degrees of freedom # Null hypothesis probability = 2.024582e-01 Photon flux (15-150 keV) in 1 sec: 0.282596 ( -0.105582 0.10569 ) ph/cm2/s Energy fluence (15-150 keV) : 2.14699e-08 ( -8.94685e-09 9.51785e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.388 sec. to 9.388 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.5564 ( -2.91333 -1.61499 ) Epeak [keV] : 48.3028 ( -15.3068 95.2761 ) Norm@50keV : 0.128840 ( -0.161487 26367.8 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.12 using 59 PHA bins. # Reduced chi-squared = 1.109 for 56 degrees of freedom # Null hypothesis probability = 2.673169e-01 Photon flux (15-150 keV) in 1 sec: 0.259637 ( -0.10149 0.108259 ) ph/cm2/s Energy fluence (15-150 keV) : 1.59456e-08 ( -6.98618e-09 1.09382e-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 = -1.686856964636226E-01, IMY = 2.751554163584609E-02
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: -48.211400 -15.112000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4254 -40.5100 8.2 54.3 -8.6 -0.2267 -1.4 5.4 Vela X-1 170.4940 -60.7613 622.4 43.9 28.3 0.0020 0.0 9.8 Cen X-3 186.5520 -62.7620 12.7 44.2 39.6 -0.1401 -0.9 2.9 GX 301-2 348.0501 -55.2273 2.5 26.4 160.5 0.2534 4.6 ------ UNKNOWN 125.3244 -39.0884 2.1 52.5 -18.2 0.7716 5.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -15.112000 32.888000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6316 -40.5996 12.7 54.3 -8.4 0.2645 0.9 5.4 Vela X-1 170.0896 -60.4829 6.3 44.1 27.9 0.4033 1.8 10.7 Cen X-3 186.6909 -62.7197 5.5 44.2 39.6 0.5909 2.1 3.2 GX 301-2 325.1862 -59.5077 2.5 30.2 134.1 0.6522 4.5 ------ UNKNOWN 20.7699 -64.0523 0.9 9.7 -170.7 1.1208 12.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 75.188590 867.388600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 147.2066 -60.7112 2.4 48.9 21.5 4.2140 4.8 ------ UNKNOWN 12.7315 -38.1788 2.8 26.3 -141.4 1.1401 4.2 ------ UNKNOWN 35.9570 -39.4125 2.7 26.2 -99.7 1.6897 4.4 ------ UNKNOWN 2.7016 -16.3717 3.0 49.3 -150.1 2.6201 3.9 ------ UNKNOWN