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 13 19:45:57 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger505801
======================================================================
Trigger: 00505801 Segment: 000
BAT Trigger Time: 340651592 [s; MET]
Trigger Stop: 340651656 [s; MET]
UTC: 2011-10-18T17:26:24.519600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.500387190674 Dec: -3.8713557158467 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.53
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.53
Analysis Position: [ source = BAT ]
RA: 271.500387190674 Dec: -3.8713557158467 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 271.48164211143 Dec: -3.88016502820922 [deg; J2000]
{ 18h 05m 55.6s , -03d 52' 48.6" }
+/- 2.04947526872181 [arcmin] (estimated 90% radius based on SNR)
+/- 1.23652079207562 [arcmin] (formal 1-sigma fit error)
SNR: 10.9122560663817
Angular difference between the analysis and refined position is 1.240385 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 32.7079999446869 +/- 4.21558726083862
Measured from: -0.583999991416931
to: 32.12399995327 [s; relative to TRIGTIME]
T50: 22.6039999723434 +/- 14.0117672521361
Measured from: 4.27999997138977
to: 26.8839999437332 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 21.7120000123978
to: 22.7120000123978 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.0799999833107
to: 37.2960000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.309638 0.359243 0.124190 0.018149
0.040322 0.039111 0.033198 0.028692 [error]
Peak 0.014297 0.028647 0.008236 0.005284
0.006361 0.006236 0.005113 0.004424 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 41.376 -4.080 37.296
T90 32.708 -0.584 32.124
T50 22.604 4.280 26.884
Peak 1.000 21.712 22.712
====== 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 -2.175 -0.283 0.259 - - - 1.03e-03 -2.04e-04 1.99e-04 52.390 57
CPL -2.160 -0.059 2.570 9999.360 N/A N/A 1.05e-03 N/A N/A 52.410 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 -1.776 -0.596 0.556 - - - 3.29e-03 -1.24e-03 1.18e-03 51.020 57
CPL 0.020 -2.121 -0.020 41.443 N/A N/A 4.33e-02 N/A N/A 50.580 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 1.03e-07 1.26e-07 1.12e-07 1.71e-07 4.01e-07 5.12e-07 erg/cm2
90%_error_low -1.82e-08 -1.82e-08 -2.90e-08 -7.25e-08 -6.75e-08 -1.13e-07 erg/cm2
90%_error_hi 1.86e-08 1.80e-08 3.06e-08 1.02e-07 7.00e-08 1.36e-07 erg/cm2
Peak flux PL 1.77e-01 1.51e-01 8.83e-02 7.70e-02 4.50e-01 4.93e-01 ph/cm2/s
90%_error_low -7.96e-02 -4.82e-02 -4.06e-02 -5.14e-02 -1.43e-01 -1.59e-01 ph/cm2/s
90%_error_hi 8.57e-02 4.82e-02 4.18e-02 9.33e-02 1.43e-01 1.60e-01 ph/cm2/s
Fluence CPL 9.96e-08 1.39e-07 9.85e-08 3.60e-08 3.63e-07 3.73e-07 erg/cm2
90%_error_low -2.00e-08 N/A -4.33e-08 -3.30e-08 -7.33e-08 -8.30e-08 erg/cm2
90%_error_hi 1.98e-08 N/A 3.80e-08 2.33e-07 8.73e-08 2.55e-07 erg/cm2
Peak flux CPL 1.55e-01 1.94e-01 6.25e-02 3.05e-03 4.15e-01 4.16e-01 ph/cm2/s
90%_error_low N/A N/A -5.39e-02 -3.05e-03 -1.49e-01 -1.50e-01 ph/cm2/s
90%_error_hi N/A N/A 6.52e-02 8.80e-02 1.64e-01 2.38e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 271.4816 -3.8802 0.0176 16.9258 -88.7082 0.8462499 10.912 TRIG_00505801 Foreground time interval of the image: -4.080 37.296 (delta_t = 41.376 [sec]) Background time interval of the image: -239.000 -4.080 (delta_t = 234.920 [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 -4.080 sec. to 37.296 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.17522 ( -0.282535 0.259311 ) Norm@50keV : 1.03425E-03 ( -0.000203817 0.000199043 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.39 using 59 PHA bins. # Reduced chi-squared = 0.9192 for 57 degrees of freedom # Null hypothesis probability = 6.482985e-01 Photon flux (15-150 keV) in 41.38 sec: 0.169040 ( -0.022946 0.022946 ) ph/cm2/s Energy fluence (15-150 keV) : 4.01117e-07 ( -6.749e-08 7.00021e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.080 sec. to 37.296 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.30435 ( -0.908425 1.71978 ) Epeak [keV] : 29.5445 ( ) Norm@50keV : 3.59902E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.01 using 59 PHA bins. # Reduced chi-squared = 0.9108 for 56 degrees of freedom # Null hypothesis probability = 6.639129e-01 Photon flux (15-150 keV) in 41.38 sec: 0.164399 ( -0.02365 0.023813 ) ph/cm2/s Energy fluence (15-150 keV) : 3.63053e-07 ( -7.32786e-08 8.72659e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 21.712 sec. to 22.712 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77599 ( -0.595708 0.556372 ) Norm@50keV : 3.29215E-03 ( -0.00123592 0.00117847 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.02 using 59 PHA bins. # Reduced chi-squared = 0.8952 for 57 degrees of freedom # Null hypothesis probability = 6.975621e-01 Photon flux (15-150 keV) in 1 sec: 0.449521 ( -0.143355 0.143448 ) ph/cm2/s Energy fluence (15-150 keV) : 3.03417e-08 ( -1.10957e-08 1.16893e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.712 sec. to 22.712 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.0199901 ( -2.17383 -0.0729448 ) Epeak [keV] : 41.4431 ( ) Norm@50keV : 4.33087E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.58 using 59 PHA bins. # Reduced chi-squared = 0.9031 for 56 degrees of freedom # Null hypothesis probability = 6.795804e-01 Photon flux (15-150 keV) in 1 sec: 0.414919 ( -0.148705 0.163679 ) ph/cm2/s Energy fluence (15-150 keV) : 2.2752e-08 ( -5.42035e-09 1.68703e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 32.708 sec. Hardness ratio (energy fluence ratio) = 0.885665823458
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.297952e-07 S(50-150 keV) = 1.7132129e-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 = 6.860509801925356E-03, IMY = 3.042375419936534E-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: -239.000000 -4.080000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3346 35.2951 6.0 46.6 -21.4 -0.6960 -1.9 6.7 Her X-1 263.0093 -24.7464 54.8 34.9 -121.5 0.0645 0.2 0.1 GX 1+4 264.9216 -44.4488 40.4 49.5 -141.7 -0.1769 -0.3 7.7 4U 1735-44 268.3301 -1.4961 2.5 19.6 -79.4 0.8917 4.5 3.5 SW J1753.5-0127 270.3235 -25.0615 2.3 30.8 -131.0 1.3081 5.0 2.4 GX 5-1 270.3759 -25.6679 4.6 31.2 -131.8 0.6725 2.5 6.0 GRS 1758-258 273.9900 -14.0913 2.7 20.1 -120.8 0.8322 4.2 3.4 GX 17+2 276.0343 -30.4108 2.8 33.0 -144.3 0.9201 4.1 6.2 H1820-303 285.1848 -24.8906 19.8 25.6 -157.6 0.1085 0.6 8.3 HT1900.1-2455 288.8099 10.8096 3.0 10.2 22.4 0.6920 3.9 8.2 GRS 1915+105 299.5315 35.2966 8.1 36.4 33.1 0.4650 1.4 6.4 Cyg X-1 308.1632 40.9544 9.1 44.3 38.9 0.9010 1.3 2.4 Cyg X-3 263.0073 -33.9646 4.7 41.7 -131.6 0.9174 2.4 7.8 GX 354-0 312.0793 6.7335 3.7 25.0 92.1 0.8417 3.1 ------ UNKNOWN 278.6157 -12.8763 2.6 16.3 -129.4 0.8092 4.5 ------ UNKNOWN 239.3411 37.3429 3.6 57.7 -27.9 4.0593 3.2 ------ UNKNOWN 241.5540 18.5338 2.6 48.8 -48.8 3.6841 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.080000 37.296000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2807 35.4184 6.3 46.7 -21.3 0.2479 1.8 9.8 Her X-1 262.9313 -24.8848 5.0 35.1 -121.5 0.2625 2.3 9.4 GX 1+4 264.6704 -44.5337 6.3 49.6 -141.6 0.4277 1.8 5.9 4U 1735-44 268.3011 -1.3251 6.1 19.6 -78.9 0.1491 1.9 8.6 SW J1753.5-0127 270.3244 -25.1695 8.5 30.8 -131.1 -0.1267 -1.4 5.8 GX 5-1 270.4126 -25.5884 0.0 31.1 -131.7 -0.0803 -0.9 11.0 GRS 1758-258 274.1113 -13.8639 0.0 19.8 -120.5 0.2078 2.6 12.0 GX 17+2 276.1135 -30.4285 4.2 33.0 -144.4 -0.2410 -2.7 10.4 H1820-303 285.1836 -24.8872 4.9 25.6 -157.6 0.1678 2.3 8.3 HT1900.1-2455 288.6155 11.0264 6.5 10.4 21.2 0.1213 1.8 11.8 GRS 1915+105 299.5155 35.2688 6.6 36.3 33.1 -0.2248 -1.8 5.4 Cyg X-1 308.1525 41.0875 92.7 44.5 38.8 -0.0296 -0.1 8.3 Cyg X-3 263.0272 -33.8550 11.0 41.6 -131.5 -0.1545 -1.0 2.3 GX 354-0 271.4816 -3.8802 1.1 16.9 -88.7 0.8464 10.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 112.300590 963.111500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9834 -15.6438 0.3 28.6 -107.0 27.6955 36.8 0.3 Sco X-1 254.5859 35.2417 2.9 42.2 -11.6 -3.2659 -4.0 8.7 Her X-1 256.0273 -37.8102 1.5 36.8 -150.3 5.7052 7.7 2.8 4U 1700-377 256.3996 -36.5004 3.9 35.5 -149.7 2.1071 3.0 5.0 GX 349+2 263.0837 -24.8875 5.8 22.5 -150.6 1.1758 2.0 9.4 GX 1+4 264.8341 -44.4513 3.5 41.0 -163.6 2.7162 3.2 3.9 4U 1735-44 268.3822 -1.3993 2.5 4.0 -42.9 2.6938 4.6 3.3 SW J1753.5-0127 270.3019 -25.0988 2.3 21.3 -167.9 2.8954 5.0 1.5 GX 5-1 270.3378 -25.8203 6.0 22.0 -168.0 1.1473 1.9 5.0 GRS 1758-258 274.0207 -13.9792 1.9 10.4 175.6 3.2525 6.1 3.5 GX 17+2 275.9169 -30.3187 5.3 26.8 -179.3 1.3326 2.2 2.9 H1820-303 284.8974 -24.7995 4.7 24.6 158.8 1.5879 2.5 10.5 HT1900.1-2455 288.7582 10.8988 2.7 22.6 58.2 3.0904 4.3 3.7 GRS 1915+105 299.5350 35.1783 10.9 47.1 40.7 2.6092 1.1 3.1 Cyg X-1 263.1461 -33.8139 6.6 31.0 -157.3 1.1531 1.7 7.9 GX 354-0 310.4065 4.9589 3.3 39.8 86.6 9.1981 3.5 ------ UNKNOWN 283.4088 27.1421 2.5 33.1 28.7 3.6550 4.6 ------ UNKNOWN 287.8592 0.5762 2.1 16.9 84.2 3.4904 5.5 ------ UNKNOWN 266.3519 51.2301 3.1 55.3 5.2 11.6060 3.7 ------ UNKNOWN 276.5173 0.5089 2.7 6.6 58.0 2.0978 4.3 ------ UNKNOWN 262.4714 29.9758 3.4 34.9 -4.7 2.3555 3.4 ------ UNKNOWN