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: Fri Jan 17 17:56:21 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger425151
======================================================================
Trigger: 00425151 Segment: 000
BAT Trigger Time: 298782218.752 [s; MET]
Trigger Stop: 298782219.776 [s; MET]
UTC: 2010-06-21T03:03:32.840140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 315.308020107616 Dec: -51.0864237917052 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.67
Image Trigger?: NO
Rate S/N Ratio: 58.7537232862735 [ if not an image trigger ]
Image S/N Ratio: 18.67
Analysis Position: [ source = BAT ]
RA: 315.308020107616 Dec: -51.0864237917052 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 315.309092390252 Dec: -51.1023517510873 [deg; J2000]
{ 21h 01m 14.2s , -51d 06' 08.5" }
+/- 0.503316638038972 [arcmin] (estimated 90% radius based on SNR)
+/- 0.112951456530024 [arcmin] (formal 1-sigma fit error)
SNR: 81.1071980715528
Angular difference between the analysis and refined position is 0.956531 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 63.5519999265671 +/- 1.7075502970681
Measured from: 1.216000020504
to: 64.7679999470711 [s; relative to TRIGTIME]
T50: 25.7599999904633 +/- 0.703659018375438
Measured from: 17.9160000085831
to: 43.6759999990463 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 24.4640000462532
to: 25.4640000462532 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.09999996423721
to: 204.284000039101 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 14.200694 14.645488 8.395227 1.628453
0.093607 0.095211 0.081402 0.064791 [error]
Peak 0.438457 0.633156 0.450316 0.071301
0.010801 0.012574 0.011135 0.006423 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 210.384 -6.100 204.284
T90 63.552 1.216 64.768
T50 25.760 17.916 43.676
Peak 1.000 24.464 25.464
====== 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 -1.896 -0.030 0.030 - - - 1.06e-02 -1.55e-04 1.55e-04 46.460 57
CPL -1.812 -0.101 0.123 129.012 -44.238 -129.012 1.15e-02 -1.01e-03 1.45e-03 45.050 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.574 -0.047 0.047 - - - 1.03e-01 -2.71e-03 2.71e-03 71.210 57
CPL -0.946 -0.205 0.214 90.632 -10.613 18.579 2.02e-01 -3.91e-02 5.12e-02 41.400 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 4.15e-06 5.99e-06 6.44e-06 1.29e-05 2.06e-05 2.94e-05 erg/cm2
90%_error_low -1.37e-07 -1.12e-07 -1.10e-07 -5.21e-07 -3.00e-07 -5.52e-07 erg/cm2
90%_error_hi 1.39e-07 1.12e-07 1.10e-07 5.36e-07 3.00e-07 5.60e-07 erg/cm2
Peak flux PL 4.55e+00 4.38e+00 2.94e+00 3.09e+00 1.31e+01 1.50e+01 ph/cm2/s
90%_error_low -2.24e-01 -1.31e-01 -9.38e-02 -2.01e-01 -3.74e-01 -3.93e-01 ph/cm2/s
90%_error_hi 2.28e-01 1.31e-01 9.35e-02 2.10e-01 3.75e-01 3.93e-01 ph/cm2/s
Fluence CPL 4.04e-06 6.00e-06 6.48e-06 1.17e-05 2.04e-05 2.82e-05 erg/cm2
90%_error_low -1.97e-07 -1.13e-07 -1.26e-07 -1.49e-06 -3.56e-07 -1.58e-06 erg/cm2
90%_error_hi 2.00e-07 1.13e-07 1.27e-07 1.35e-06 3.56e-07 1.49e-06 erg/cm2
Peak flux CPL 3.91e+00 4.53e+00 3.12e+00 1.76e+00 1.26e+01 1.33e+01 ph/cm2/s
90%_error_low -2.85e-01 -1.45e-01 -1.12e-01 -2.78e-01 -4.02e-01 -5.15e-01 ph/cm2/s
90%_error_hi 2.91e-01 1.46e-01 1.13e-01 3.35e-01 4.04e-01 5.45e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 315.3091 -51.1024 0.0024 17.0519 -145.1946 6.6285699 81.107 TRIG_00425151 Foreground time interval of the image: -6.100 12.349 (delta_t = 18.449 [sec]) Background time interval of the image: -43.051 -6.100 (delta_t = 36.951 [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 -6.100 sec. to 204.284 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.89639 ( -0.0299899 0.0299908 ) Norm@50keV : 1.06253E-02 ( -0.000155008 0.000154966 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.46 using 59 PHA bins. # Reduced chi-squared = 0.8151 for 57 degrees of freedom # Null hypothesis probability = 8.394287e-01 Photon flux (15-150 keV) in 210.4 sec: 1.52261 ( -0.03086 0.03107 ) ph/cm2/s Energy fluence (15-150 keV) : 2.05559e-05 ( -3.00241e-07 3.00357e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.100 sec. to 204.284 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.81205 ( -0.101087 0.123363 ) Epeak [keV] : 129.012 ( -44.2383 -129.012 ) Norm@50keV : 1.15437E-02 ( -0.00101035 0.00145056 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.05 using 59 PHA bins. # Reduced chi-squared = 0.8045 for 56 degrees of freedom # Null hypothesis probability = 8.524033e-01 Photon flux (15-150 keV) in 210.4 sec: 1.55375 ( -0.03996 0.02646 ) ph/cm2/s Energy fluence (15-150 keV) : 2.04186e-05 ( -3.55591e-07 3.55685e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 24.464 sec. to 25.464 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.57351 ( -0.0469984 0.0468215 ) Norm@50keV : 0.102938 ( -0.00271548 0.00271466 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.21 using 59 PHA bins. # Reduced chi-squared = 1.249 for 57 degrees of freedom # Null hypothesis probability = 9.760124e-02 Photon flux (15-150 keV) in 1 sec: 13.1222 ( -0.3739 0.3747 ) ph/cm2/s Energy fluence (15-150 keV) : 9.66073e-07 ( -2.67823e-08 2.68144e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.464 sec. to 25.464 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.945834 ( -0.204878 0.214484 ) Epeak [keV] : 90.6319 ( -10.6126 18.5793 ) Norm@50keV : 0.202246 ( -0.0391478 0.0512324 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.40 using 59 PHA bins. # Reduced chi-squared = 0.7394 for 56 degrees of freedom # Null hypothesis probability = 9.274075e-01 Photon flux (15-150 keV) in 1 sec: 12.6050 ( -0.4021 0.4043 ) ph/cm2/s Energy fluence (15-150 keV) : 9.31816e-07 ( -2.92894e-08 2.91986e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 63.552 sec. Hardness ratio (energy fluence ratio) = 1.07448439257
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0136216e-05 S(50-150 keV) = 1.0419646e-05
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 = -2.518474948484013E-01, IMY = 1.750738530211234E-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: -43.051390 -6.100000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6832 -62.6059 7.8 51.5 -33.7 -0.3464 -1.5 9.9 GX 301-2 255.7977 -37.8981 242.0 26.1 36.6 -0.0039 -0.0 9.5 4U 1700-377 256.3994 -36.3947 3.8 26.7 39.9 0.2568 3.1 2.4 GX 349+2 262.9742 -24.7572 11.1 32.1 64.1 0.1295 1.0 2.0 GX 1+4 264.6606 -44.5707 72.9 16.9 31.4 -0.0107 -0.2 8.1 4U 1735-44 270.2652 -25.0132 4.1 28.8 75.5 0.3079 2.8 4.1 GX 5-1 270.1462 -25.6992 5.5 28.2 74.7 0.2195 2.1 8.8 GRS 1758-258 274.1444 -14.1568 47.1 37.8 88.4 -0.0603 -0.2 10.8 GX 17+2 276.0760 -30.3107 2.6 21.9 81.8 0.3890 4.5 8.5 H1820-303 285.0242 -24.8772 11.3 25.4 104.2 0.0935 1.0 2.7 HT1900.1-2455 262.8182 -33.8046 4.1 24.8 52.7 0.2392 2.8 8.7 GX 354-0 283.9196 -82.0349 2.0 31.9 -67.7 0.5578 5.6 ------ UNKNOWN 54.7357 -86.7996 2.4 41.8 -72.7 1.2500 4.8 ------ UNKNOWN 6.2481 -53.0505 1.9 46.0 -123.6 1.8578 5.9 ------ UNKNOWN 13.3795 -74.7917 3.8 40.9 -92.3 0.8903 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -6.100000 12.348610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6586 -62.8635 13.1 51.4 -33.9 0.2441 0.9 5.6 GX 301-2 256.0841 -37.8955 15.1 25.9 37.0 0.0827 0.8 5.6 4U 1700-377 256.3177 -36.2856 46.1 26.8 40.0 -0.0284 -0.3 10.0 GX 349+2 263.0833 -24.5874 7.6 32.2 64.5 0.2523 1.5 10.3 GX 1+4 264.5604 -44.4512 9.8 17.0 31.6 0.1029 1.2 7.8 4U 1735-44 270.1404 -25.1068 15.6 28.7 75.2 0.1075 0.7 8.0 GX 5-1 270.4704 -25.8590 7.8 27.9 75.1 -0.2027 -1.5 11.4 GRS 1758-258 273.8844 -14.0516 6.4 38.0 88.0 0.5805 1.8 7.1 GX 17+2 276.1191 -30.4781 6.8 21.7 81.7 -0.1844 -1.7 12.1 H1820-303 284.9503 -25.1022 0.0 25.2 104.0 -0.0640 -0.5 11.9 HT1900.1-2455 262.8222 -33.9779 7.0 24.7 52.4 -0.1847 -1.6 12.0 GX 354-0 317.7454 -23.5382 2.5 35.1 162.8 0.5715 4.6 ------ UNKNOWN 334.6154 -23.0413 2.1 44.9 -178.4 0.8459 5.6 ------ UNKNOWN 315.3091 -51.1024 0.1 17.1 -145.2 6.6287 81.1 ------ UNKNOWN 344.7023 -25.2943 2.5 49.6 -167.2 0.8454 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 63.948600 962.310700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.6830 -44.6548 68.4 33.9 60.1 -0.1574 -0.2 12.6 4U 1735-44 275.8095 -30.4206 3.3 35.7 89.5 4.7770 3.4 6.8 H1820-303 285.2624 -24.9164 0.0 34.8 106.8 -0.5373 -0.4 12.3 HT1900.1-2455 318.3813 3.1903 2.4 54.3 163.2 11.7935 4.8 ------ UNKNOWN 321.5875 2.9018 3.1 54.3 167.2 9.3490 3.7 ------ UNKNOWN 276.0790 -57.9690 3.2 23.4 37.1 1.8813 3.6 ------ UNKNOWN 315.2469 -51.0764 1.8 0.0 95.1 3.1830 6.5 ------ UNKNOWN 321.9823 -37.6805 3.8 14.2 -178.6 1.4319 3.1 ------ UNKNOWN 339.1104 -24.6826 4.1 32.1 -156.9 1.6938 2.8 ------ UNKNOWN 113.9639 -71.6828 3.7 56.3 -28.5 11.3463 3.2 ------ UNKNOWN