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 03:20:41 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger307604
======================================================================
Trigger: 00307604 Segment: 000
BAT Trigger Time: 228110960 [s; MET]
Trigger Stop: 228111024 [s; MET]
UTC: 2008-03-25T04:09:17.332080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 277.894805295646 Dec: 36.5106329498597 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.46
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.46
Analysis Position: [ source = BAT ]
RA: 277.894805295646 Dec: 36.5106329498597 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 277.903438174341 Dec: 36.5163054322944 [deg; J2000]
{ 18h 31m 36.8s , +36d 30' 58.7" }
+/- 1.92534559797056 [arcmin] (estimated 90% radius based on SNR)
+/- 0.922876322742614 [arcmin] (formal 1-sigma fit error)
SNR: 11.9310148211606
Angular difference between the analysis and refined position is 0.537723 arcmin
Partial Coding Fraction: 0.1083984 [ including projection effects ]
Duration
T90: 166.740000009537 +/- 32.5933250583472
Measured from: -26.944000005722
to: 139.796000003815 [s; relative to TRIGTIME]
T50: 67.6760000288486 +/- 19.1432508107739
Measured from: -4.40000000596046
to: 63.2760000228882 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 43.8000000119209
to: 44.8000000119209 [s; relative to TRIGTIME]
Total Fluence
Measured from: -33.33599999547
to: 170.027999997139 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.973052 2.459153 2.238778 0.462694
0.220480 0.205232 0.180215 0.160362 [error]
Peak 0.067478 0.027181 0.034865 0.040936
0.019997 0.018949 0.016481 0.014405 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 203.364 -33.336 170.028
T90 166.740 -26.944 139.796
T50 67.676 -4.400 63.276
Peak 1.000 43.800 44.800
====== 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 -1.560 -0.163 0.162 - - - 2.62e-03 -2.24e-04 2.23e-04 49.620 57
CPL -1.559 -0.162 0.346 9999.350 -9999.350 -9999.350 2.63e-03 -2.63e-03 -1.13e-03 49.630 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 -2.527 -2.450 5.035 - - - 7.14e-03 -7.14e-03 5.61e-03 64.310 57
CPL -2.137 -0.838 1.932 65.699 N/A N/A 7.54e-03 N/A N/A 64.190 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 7.20e-07 1.27e-06 1.73e-06 4.84e-06 5.01e-06 8.56e-06 erg/cm2
90%_error_low -1.19e-07 -1.26e-07 -1.85e-07 -1.08e-06 -4.46e-07 -1.20e-06 erg/cm2
90%_error_hi 1.26e-07 1.24e-07 1.82e-07 1.27e-06 4.48e-07 1.35e-06 erg/cm2
Peak flux PL 8.09e-01 4.38e-01 1.49e-01 6.53e-02 1.43e+00 1.46e+00 ph/cm2/s
90%_error_low -8.09e-01 -2.99e-01 -1.49e-01 -6.53e-02 -1.43e+00 -6.41e-01 ph/cm2/s
90%_error_hi 6.51e-01 2.03e-01 2.18e-01 8.99e-01 6.48e-01 6.46e-01 ph/cm2/s
Fluence CPL 7.38e-07 1.28e-06 1.71e-06 5.27e-06 5.04e-06 8.52e-06 erg/cm2
90%_error_low N/A -1.26e-07 N/A -2.24e-06 -4.76e-07 -1.76e-06 erg/cm2
90%_error_hi N/A 1.24e-07 N/A 5.53e-07 4.19e-07 1.30e-06 erg/cm2
Peak flux CPL 8.30e-01 1.45e-01 1.28e-02 1.50e-03 9.88e-01 9.86e-01 ph/cm2/s
90%_error_low -5.38e-01 -1.45e-01 -1.28e-02 N/A -6.52e-01 -6.50e-01 ph/cm2/s
90%_error_hi 5.38e-01 3.32e-01 1.10e-01 N/A 7.31e-01 7.39e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 277.9034 36.5163 0.0161 55.8155 -165.2759 5.5479682 11.931 TRIG_00307604 Foreground time interval of the image: -33.336 71.901 (delta_t = 105.237 [sec]) Background time interval of the image: -323.000 -33.336 (delta_t = 289.664 [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 -33.336 sec. to 170.028 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.55975 ( -0.162894 0.162121 ) Norm@50keV : 2.61946E-03 ( -0.000223514 0.000223388 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.62 using 59 PHA bins. # Reduced chi-squared = 0.8705 for 57 degrees of freedom # Null hypothesis probability = 7.456018e-01 Photon flux (15-150 keV) in 203.4 sec: 0.332560 ( -0.031625 0.031865 ) ph/cm2/s Energy fluence (15-150 keV) : 5.00958e-06 ( -4.46048e-07 4.47761e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -33.336 sec. to 170.028 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.71002 ( -0.162146 0.345504 ) Epeak [keV] : 232.430 ( -9999.36 -9999.36 ) Norm@50keV : 6.80408E-04 ( -0.000680419 0.000820627 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.26 using 59 PHA bins. # Reduced chi-squared = 0.8618 for 56 degrees of freedom # Null hypothesis probability = 7.593445e-01 Photon flux (15-150 keV) in 203.4 sec: 0.332565 ( -0.03167 0.031831 ) ph/cm2/s Energy fluence (15-150 keV) : 5.03769e-06 ( -4.75525e-07 4.18644e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 43.800 sec. to 44.800 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.52716 ( -2.4346 5.05047 ) Norm@50keV : 7.14361E-03 ( -0.00704237 0.00570705 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.31 using 59 PHA bins. # Reduced chi-squared = 1.128 for 57 degrees of freedom # Null hypothesis probability = 2.358706e-01 Photon flux (15-150 keV) in 1 sec: 1.43064 ( -1.43064 0.648 ) ph/cm2/s Energy fluence (15-150 keV) : 7.0531e-08 ( -3.85332e-08 4.74766e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 43.800 sec. to 44.800 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.13686 ( -0.838277 1.93217 ) Epeak [keV] : 65.6990 ( ) Norm@50keV : 7.54353E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.19 using 59 PHA bins. # Reduced chi-squared = 1.146 for 56 degrees of freedom # Null hypothesis probability = 2.113628e-01 Photon flux (15-150 keV) in 1 sec: 0.988082 ( -0.651627 0.730718 ) ph/cm2/s Energy fluence (15-150 keV) : 4.92674e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 166.74 sec. Hardness ratio (energy fluence ratio) = 1.35687588
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.9944049e-06 S(50-150 keV) = 3.015198e-06
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 = -1.423964840634192E+00, IMY = 3.742103009276630E-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: -323.000000 -33.336000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9851 -15.6437 0.3 26.6 102.7 13.9691 41.6 0.4 Sco X-1 256.0047 -37.8386 12.7 23.7 43.8 0.2387 0.9 0.9 4U 1700-377 256.4226 -36.3957 3.4 22.4 45.6 0.8712 3.4 1.8 GX 349+2 263.0684 -24.5916 6.1 10.4 65.9 0.3975 1.9 9.8 GX 1+4 264.7788 -44.4615 606.1 26.2 22.3 0.0047 0.0 1.7 4U 1735-44 268.3510 -1.4067 3.2 18.2 175.8 0.7904 3.6 2.9 SW J1753.5-0127 270.2532 -25.1350 2.9 6.4 29.0 0.9307 4.0 3.7 GX 5-1 270.4783 -25.8180 7.8 7.0 25.5 0.3503 1.5 10.5 GRS 1758-258 274.1067 -14.1291 3.2 5.1 -154.0 0.8356 3.6 8.1 GX 17+2 275.8813 -30.3850 1.9 11.7 -4.5 1.4668 6.2 2.5 H1820-303 284.8421 -24.8241 4.6 12.7 -51.3 0.5810 2.5 12.0 HT1900.1-2455 288.7959 10.9322 7.3 34.0 -141.1 0.4574 1.6 0.8 GRS 1915+105 262.8337 -33.9914 0.0 17.3 37.9 0.3092 1.2 12.2 GX 354-0 250.5244 1.3033 2.4 29.8 140.4 1.4849 4.8 ------ UNKNOWN 267.2978 -26.6379 1.6 9.0 41.5 1.6296 7.1 ------ UNKNOWN 285.3758 -51.3951 2.8 33.9 -4.8 1.3330 4.2 ------ UNKNOWN 320.2097 -62.3339 2.4 54.2 -15.4 3.5990 4.8 ------ UNKNOWN 294.2971 1.8125 2.7 29.8 -122.5 1.2407 4.3 ------ UNKNOWN 326.8394 -39.4148 4.7 50.6 -44.6 3.5475 2.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -33.336000 71.900600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8824 -15.7194 131.8 26.6 102.4 0.0148 0.1 7.3 Sco X-1 255.9858 -37.8440 46.6 23.7 43.8 -0.0331 -0.2 0.0 4U 1700-377 256.4367 -36.4244 102.7 22.4 45.6 -0.0147 -0.1 0.1 GX 349+2 263.1547 -24.5838 0.0 10.4 65.8 -0.2383 -2.1 12.5 GX 1+4 264.7629 -44.3324 18.1 26.1 22.4 -0.0894 -0.6 7.1 4U 1735-44 268.4966 -1.3491 3.8 18.2 176.3 -0.3358 -3.1 9.9 SW J1753.5-0127 270.4446 -25.0423 13.3 6.3 27.8 0.1033 0.9 9.0 GX 5-1 270.4502 -25.6291 11.4 6.9 26.1 0.1320 1.1 10.5 GRS 1758-258 273.9913 -13.9454 18.3 5.3 -155.7 0.0703 0.6 5.5 GX 17+2 276.0831 -30.2989 12.8 11.7 -5.4 0.1063 0.9 9.2 H1820-303 285.1796 -25.0366 738.3 13.1 -51.1 0.0017 0.0 10.5 HT1900.1-2455 288.8584 11.0120 5.7 34.1 -141.1 0.3037 2.0 5.3 GRS 1915+105 263.0010 -33.8181 287.5 17.0 37.8 0.0048 0.0 1.2 GX 354-0 280.2351 14.0264 1.9 33.9 -157.1 0.8281 6.1 ------ UNKNOWN 277.9034 36.5163 1.0 55.8 -165.3 5.5473 11.9 ------ UNKNOWN 283.7191 26.4876 2.5 46.8 -156.7 1.0349 4.6 ------ UNKNOWN 302.8515 -14.1157 2.5 29.4 -85.5 0.7552 4.5 ------ UNKNOWN 283.8394 38.8757 2.6 58.9 -160.2 3.2901 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 141.100600 511.800590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4624 35.3365 0.9 19.0 93.2 3.2457 12.7 0.4 Her X-1 268.3866 -1.4013 3.8 38.9 14.9 0.9820 3.1 3.3 SW J1753.5-0127 274.0458 -13.8874 5.2 50.5 4.5 1.2499 2.2 9.2 GX 17+2 288.8301 10.9451 1.6 27.4 -24.2 1.6878 7.2 1.9 GRS 1915+105 299.5895 35.1996 0.4 17.6 -92.5 6.5752 28.8 0.1 Cyg X-1 308.0748 40.9900 3.0 23.8 -110.4 1.0497 3.9 2.8 Cyg X-3 326.2673 38.2657 10.5 38.0 -108.0 0.7449 1.1 5.6 Cyg X-2 245.7964 1.4475 3.7 45.9 47.4 3.3885 3.1 ------ UNKNOWN 216.6609 69.2903 3.0 46.1 154.2 2.2934 3.9 ------ UNKNOWN 289.8213 68.1432 2.5 32.3 -172.0 1.0959 4.6 ------ UNKNOWN 40.7373 83.5207 3.5 57.2 -173.8 4.2875 3.3 ------ UNKNOWN