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 12 03:01:18 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger556753
======================================================================
Trigger: 00556753 Segment: 000
BAT Trigger Time: 391357300.8 [s; MET]
Trigger Stop: 391357301.824 [s; MET]
UTC: 2013-05-27T14:21:30.195820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 309.278622826908 Dec: -24.7278211819239 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.89
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 13.89
Analysis Position: [ source = BAT ]
RA: 309.278622826908 Dec: -24.7278211819239 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 309.28367215012 Dec: -24.7256766136192 [deg; J2000]
{ 20h 37m 08.1s , -24d 43' 32.4" }
+/- 1.09781641137707 [arcmin] (estimated 90% radius based on SNR)
+/- 0.452517545266986 [arcmin] (formal 1-sigma fit error)
SNR: 26.6206577351153
Angular difference between the analysis and refined position is 0.303780 arcmin
Partial Coding Fraction: 0.1005859 [ including projection effects ]
Duration
T90: 64 +/- 16
Measured from: -11.8000000119209
to: 52.1999999880791 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -11.8000000119209
to: 20.1999999880791 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -4.30000001192093
to: -3.30000001192093 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.8000000119209
to: 164.199999988079 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.274903 5.901808 6.010891 2.751821
0.181348 0.198521 0.188777 0.165669 [error]
Peak 0.018947 0.010782 0.010736 -0.026477
0.021768 0.022964 0.018371 0.017685 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 176.000 -11.800 164.200
T90 64.000 -11.800 52.200
T50 32.000 -11.800 20.200
Peak 1.000 -4.300 -3.300
====== 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 -1.167 -0.065 0.066 - - - 7.35e-03 -2.66e-04 2.65e-04 49.710 57
CPL -1.164 -0.064 0.124 9999.340 -9999.340 -9999.340 7.39e-03 -2.60e-04 1.26e-03 49.760 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 -1.615 1.615 1.615 - - - 3.06e-03 -3.06e-03 -3.06e-03 69.870 57
CPL -1.731 1.731 1.731 9997.830 -9997.830 -9997.830 3.06e-03 N/A N/A 69.880 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 1.21e-06 2.73e-06 4.86e-06 2.04e-05 1.33e-05 2.92e-05 erg/cm2
90%_error_low -9.28e-08 -1.25e-07 -1.87e-07 -1.80e-06 -4.82e-07 -1.87e-06 erg/cm2
90%_error_hi 9.57e-08 1.24e-07 1.86e-07 1.92e-06 4.83e-07 1.97e-06 erg/cm2
Peak flux PL 1.45e-01 1.34e-01 8.60e-02 8.49e-02 4.01e-01 4.48e-01 ph/cm2/s
90%_error_low -1.45e-01 -1.34e-01 -8.60e-02 -8.49e-02 -4.01e-01 -4.48e-01 ph/cm2/s
90%_error_hi 6.46e-01 2.12e-01 1.12e-01 1.34e+00 6.86e-01 6.64e-01 ph/cm2/s
Fluence CPL 1.23e-06 2.73e-06 4.82e-06 2.20e-05 1.33e-05 2.91e-05 erg/cm2
90%_error_low -1.22e-07 -1.43e-07 N/A N/A -6.13e-07 -3.82e-06 erg/cm2
90%_error_hi 7.17e-08 1.49e-07 N/A N/A 5.30e-07 1.90e-06 erg/cm2
Peak flux CPL N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_low -1.45e-01 -1.34e-01 -8.60e-02 -8.49e-02 -4.01e-01 -4.48e-01 ph/cm2/s
90%_error_hi 6.46e-01 2.12e-01 1.12e-01 1.34e+00 6.86e-01 6.64e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 309.2837 -24.7257 0.0072 48.7603 155.8505 13.4439160 26.621 TRIG_00556753 Foreground time interval of the image: -11.800 17.701 (delta_t = 29.501 [sec]) Background time interval of the image: -644.699 -630.292 (delta_t = 14.408 [sec]) -239.800 -11.800 (delta_t = 228.000 [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 -11.800 sec. to 164.200 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16667 ( -0.0649779 0.0655488 ) Norm@50keV : 7.35439E-03 ( -0.000265596 0.000264573 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.71 using 59 PHA bins. # Reduced chi-squared = 0.8720 for 57 degrees of freedom # Null hypothesis probability = 7.426208e-01 Photon flux (15-150 keV) in 176 sec: 0.859428 ( -0.03336 0.033508 ) ph/cm2/s Energy fluence (15-150 keV) : 1.32603e-05 ( -4.82286e-07 4.82756e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.800 sec. to 164.200 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16364 ( -0.063713 0.123839 ) Epeak [keV] : 9999.34 ( -9999.36 -9999.36 ) Norm@50keV : 7.38834E-03 ( -0.000263815 0.00125916 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.76 using 59 PHA bins. # Reduced chi-squared = 0.8886 for 56 degrees of freedom # Null hypothesis probability = 7.086090e-01 Photon flux (15-150 keV) in 176 sec: 0.863891 ( -0.038057 0.028761 ) ph/cm2/s Energy fluence (15-150 keV) : 1.33043e-05 ( -6.13115e-07 5.29841e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -4.300 sec. to -3.300 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -10 ( 10 10 ) Norm@50keV : 9.35567E-07 ( -9.18882e-07 -9.18882e-07 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.34 using 59 PHA bins. # Reduced chi-squared = 1.216 for 57 degrees of freedom # Null hypothesis probability = 1.265352e-01 Photon flux (15-150 keV) in 1 sec: 0.400585 0.258543 0.260471 ( ) ph/cm2/s Energy fluence (15-150 keV) : 2.8622e-08 ( 1 3.57801e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.300 sec. to -3.300 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -9.97353 ( 9.99718 9.99718 ) Epeak [keV] : 9999.36 ( -10000 -10000 ) Norm@50keV : 9.76092E-07 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.34 using 59 PHA bins. # Reduced chi-squared = 1.238 for 56 degrees of freedom # Null hypothesis probability = 1.085385e-01 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 2.35407e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 64.0 sec. Hardness ratio (energy fluence ratio) = 1.78184551034
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.940299e-06 S(50-150 keV) = 9.319966e-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 = -1.040862663714176E+00, IMY = -4.666803415466253E-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: -644.699410 -630.291900 -239.800000 -11.800000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4168 -60.6356 5.7 41.1 -5.2 0.6448 2.0 3.1 Cen X-3 186.6606 -62.7652 9.0 35.8 4.4 0.3817 1.3 0.3 GX 301-2 255.8959 -38.0172 6.5 39.1 87.2 1.7562 1.8 11.2 4U 1700-377 264.5889 -44.5218 7.1 31.0 95.0 0.7091 1.6 7.9 4U 1735-44 275.1702 -54.4532 2.8 19.6 104.2 1.0321 4.2 ------ UNKNOWN 319.8802 -19.9909 3.4 54.8 167.4 4.7239 3.5 ------ UNKNOWN 146.9880 -45.4890 3.5 59.5 -17.0 4.8279 3.3 ------ UNKNOWN 125.4661 -51.9410 3.7 55.1 -34.7 4.4437 3.1 ------ UNKNOWN 48.8672 -59.6168 3.0 40.8 -88.3 4.5069 3.9 ------ UNKNOWN 7.9572 -36.5153 3.0 51.0 -135.6 4.8801 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -11.800000 17.700600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2168 -60.7162 5.3 41.1 -5.4 -0.2796 -2.2 6.3 Cen X-3 186.4347 -62.8376 5.9 35.8 4.2 0.2270 1.9 7.3 GX 301-2 256.0329 -37.9079 3.8 39.2 87.4 1.5289 3.0 4.4 4U 1700-377 264.9616 -44.4928 20.1 31.0 95.5 0.1295 0.6 9.7 4U 1735-44 220.9103 -41.3379 3.8 45.6 47.8 1.2618 3.1 ------ UNKNOWN 281.6635 -33.0668 2.5 40.0 121.2 1.9644 4.5 ------ UNKNOWN 309.2837 -24.7257 0.4 48.8 155.9 13.4432 26.6 ------ UNKNOWN 183.6073 -43.2733 2.0 54.3 13.6 2.5694 5.9 ------ UNKNOWN 338.8132 -34.3329 2.9 44.8 -166.7 0.6553 4.0 ------ UNKNOWN 154.4253 -45.2580 2.5 58.6 -11.0 2.2642 4.7 ------ UNKNOWN 357.2890 -38.6386 2.8 45.9 -145.0 0.7045 4.2 ------ UNKNOWN 50.2827 -59.9312 3.0 40.8 -87.1 1.1849 3.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 93.700590 962.270000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.8693 -44.5221 8.1 40.9 61.0 -3.4330 -1.4 6.9 4U 1735-44 270.3737 -25.0841 3.6 35.2 92.3 4.6216 3.2 4.9 GX 5-1 270.1514 -25.6066 0.0 35.3 91.3 -1.0166 -0.7 11.6 GRS 1758-258 273.8939 -14.1417 4.3 34.9 112.3 4.2515 2.7 9.1 GX 17+2 275.7582 -30.3096 5.1 30.1 83.0 2.5478 2.3 9.3 H1820-303 284.8712 -24.9661 4.8 22.1 95.5 -1.8147 -2.4 9.4 HT1900.1-2455 288.8033 10.9470 1.1 40.9 159.6 12.8436 10.3 0.3 GRS 1915+105 280.7428 -16.8086 2.7 27.8 112.3 3.9393 4.3 ------ UNKNOWN 285.3544 -5.8314 2.4 29.7 136.8 4.2901 4.9 ------ UNKNOWN 299.5766 -13.3391 2.7 14.6 150.7 2.2832 4.3 ------ UNKNOWN 12.2688 -60.9592 3.9 55.5 -20.4 6.7084 3.0 ------ UNKNOWN 7.6744 -41.2726 4.1 50.7 -44.6 11.0308 2.8 ------ UNKNOWN