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 20:22:54 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger504215
======================================================================
Trigger: 00504215 Segment: 000
BAT Trigger Time: 338867499.2 [s; MET]
Trigger Stop: 338867507.392 [s; MET]
UTC: 2011-09-28T01:51:31.789800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 257.754544715356 Dec: 36.5702621705059 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.03
Image Trigger?: NO
Rate S/N Ratio: 8.54400374531753 [ if not an image trigger ]
Image S/N Ratio: 7.03
Analysis Position: [ source = BAT ]
RA: 257.754544715356 Dec: 36.5702621705059 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 257.758017220655 Dec: 36.5549774931595 [deg; J2000]
{ 17h 11m 01.9s , +36d 33' 17.9" }
+/- 2.19340753528357 [arcmin] (estimated 90% radius based on SNR)
+/- 1.07181645577845 [arcmin] (formal 1-sigma fit error)
SNR: 9.90387270752285
Angular difference between the analysis and refined position is 0.932224 arcmin
Partial Coding Fraction: 0.375 [ including projection effects ]
Duration
T90: 20.879999935627 +/- 4.53487198773953
Measured from: 1.77200001478195
to: 22.6519999504089 [s; relative to TRIGTIME]
T50: 13.0919999480247 +/- 6.51049919378927
Measured from: 3.75999999046326
to: 16.851999938488 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.8400000333786
to: 7.8400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.08799999952316
to: 27.8759999871254 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.146344 0.271691 0.358845 0.152838
0.055059 0.052675 0.044831 0.037669 [error]
Peak 0.020270 0.037728 0.033373 0.019569
0.010194 0.009693 0.008360 0.007198 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 28.964 -1.088 27.876
T90 20.880 1.772 22.652
T50 13.092 3.760 16.852
Peak 1.000 6.840 7.840
====== 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 -1.039 -0.289 0.313 - - - 2.27e-03 -4.01e-04 3.89e-04 44.980 57
CPL -0.845 -1.449 -1.151 373.844 N/A N/A 2.72e-03 N/A N/A 45.010 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 -1.498 -0.469 0.478 - - - 7.12e-03 -1.97e-03 1.97e-03 59.600 57
CPL -0.252 -1.615 3.745 71.677 -41.432 -71.677 2.91e-02 -2.91e-02 1.71e+00 58.620 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 5.47e-08 1.33e-07 2.60e-07 1.25e-06 7.02e-07 1.69e-06 erg/cm2
90%_error_low -1.93e-08 -3.07e-08 -4.20e-08 -4.18e-07 -1.11e-07 -4.35e-07 erg/cm2
90%_error_hi 2.24e-08 3.00e-08 4.16e-08 5.62e-07 1.11e-07 5.55e-07 erg/cm2
Peak flux PL 2.93e-01 2.95e-01 2.09e-01 2.35e-01 8.89e-01 1.03e+00 ph/cm2/s
90%_error_low -1.35e-01 -9.46e-02 -6.74e-02 -1.24e-01 -2.61e-01 -2.85e-01 ph/cm2/s
90%_error_hi 1.59e-01 9.24e-02 6.62e-02 1.87e-01 2.66e-01 2.85e-01 ph/cm2/s
Fluence CPL 5.38e-08 1.34e-07 2.62e-07 1.23e-06 7.01e-07 1.60e-06 erg/cm2
90%_error_low -2.61e-08 -3.10e-08 -4.37e-08 -8.71e-07 -1.13e-07 -7.91e-07 erg/cm2
90%_error_hi 1.69e-08 3.07e-08 5.55e-08 3.07e-07 1.12e-07 6.11e-07 erg/cm2
Peak flux CPL 2.27e-01 3.23e-01 2.29e-01 8.09e-02 8.38e-01 8.60e-01 ph/cm2/s
90%_error_low -1.57e-01 -1.10e-01 -7.99e-02 -8.09e-02 -2.75e-01 -2.94e-01 ph/cm2/s
90%_error_hi 1.92e-01 1.18e-01 8.34e-02 2.11e-01 2.80e-01 3.58e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 257.7580 36.5550 0.0195 45.3239 -21.5819 1.0100310 9.904 TRIG_00504215 Foreground time interval of the image: -1.088 27.876 (delta_t = 28.964 [sec]) Background time interval of the image: -239.200 -1.088 (delta_t = 238.112 [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 -1.088 sec. to 27.876 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.03884 ( -0.289158 0.313208 ) Norm@50keV : 2.27228E-03 ( -0.000400974 0.000388798 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.98 using 59 PHA bins. # Reduced chi-squared = 0.7891 for 57 degrees of freedom # Null hypothesis probability = 8.754801e-01 Photon flux (15-150 keV) in 28.96 sec: 0.262228 ( -0.047492 0.048438 ) ph/cm2/s Energy fluence (15-150 keV) : 7.02115e-07 ( -1.11045e-07 1.11106e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.088 sec. to 27.876 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.03707 ( -0.256232 0.0416287 ) Epeak [keV] : 13.1421 ( ) Norm@50keV : 2.25032E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.58 using 59 PHA bins. # Reduced chi-squared = 0.7960 for 56 degrees of freedom # Null hypothesis probability = 8.640640e-01 Photon flux (15-150 keV) in 28.96 sec: 0.261345 ( -0.050384 0.04426 ) ph/cm2/s Energy fluence (15-150 keV) : 7.01017e-07 ( -1.13489e-07 1.11941e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.840 sec. to 7.840 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.49836 ( -0.468599 0.478356 ) Norm@50keV : 7.12026E-03 ( -0.00196869 0.00196751 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.60 using 59 PHA bins. # Reduced chi-squared = 1.046 for 57 degrees of freedom # Null hypothesis probability = 3.814083e-01 Photon flux (15-150 keV) in 1 sec: 0.888508 ( -0.261395 0.265942 ) ph/cm2/s Energy fluence (15-150 keV) : 6.75741e-08 ( -1.94425e-08 1.96607e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.840 sec. to 7.840 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.252122 ( -1.61459 3.74543 ) Epeak [keV] : 71.6773 ( -41.4317 -71.6767 ) Norm@50keV : 2.90795E-02 ( -0.0290805 1.71167 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.62 using 59 PHA bins. # Reduced chi-squared = 1.047 for 56 degrees of freedom # Null hypothesis probability = 3.796965e-01 Photon flux (15-150 keV) in 1 sec: 0.838027 ( -0.274644 0.279683 ) ph/cm2/s Energy fluence (15-150 keV) : 6.25043e-08 ( -2.10366e-08 2.16488e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 20.88 sec. Hardness ratio (energy fluence ratio) = 1.94688363179
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.8802425e-07 S(50-150 keV) = 5.140864e-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 = 9.404664190719637E-01, IMY = 3.720125006224086E-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: -239.200000 -1.088000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9737 -15.6398 0.7 38.2 -106.2 7.5940 15.5 0.3 Sco X-1 254.3376 35.2743 6.3 46.0 -25.8 0.6915 1.8 7.2 Her X-1 256.0084 -37.8603 2.0 42.0 -143.8 1.9391 5.8 1.4 4U 1700-377 256.4275 -36.4212 11.1 40.7 -142.8 0.3436 1.0 0.4 GX 349+2 263.1000 -24.6516 10.0 28.1 -136.7 0.2605 1.1 7.5 GX 1+4 264.8339 -44.6046 4.6 44.2 -157.3 0.8233 2.5 10.1 4U 1735-44 268.4534 -1.5914 5.2 13.2 -78.7 0.4467 2.2 9.8 SW J1753.5-0127 270.1457 -25.1807 35.7 24.8 -149.1 -0.0615 -0.3 9.7 GX 5-1 270.2788 -25.7149 5.1 25.2 -150.0 0.4712 2.5 2.1 GRS 1758-258 274.0864 -14.0327 2.7 13.3 -141.1 0.8013 4.3 4.7 GX 17+2 275.7523 -30.2267 4.3 27.8 -163.6 0.5252 2.7 12.3 H1820-303 285.1763 -24.9370 5.2 22.2 176.9 0.4264 2.2 7.7 HT1900.1-2455 288.8247 11.0430 2.2 15.8 32.7 0.9931 5.3 6.1 GRS 1915+105 299.6490 35.2070 2.7 41.8 27.9 1.6623 4.3 2.9 Cyg X-1 308.0385 40.9720 10.3 50.1 31.6 1.1954 1.1 3.5 Cyg X-3 262.8656 -33.8040 4.6 35.4 -147.1 0.6221 2.5 6.4 GX 354-0 319.6476 6.5064 2.9 39.2 81.5 2.9757 4.0 ------ UNKNOWN 255.1444 23.3479 2.7 36.8 -37.4 1.2174 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.088000 27.876000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0152 -15.5218 6.7 38.1 -106.0 0.2585 1.7 7.4 Sco X-1 254.5883 35.3853 7.9 45.9 -25.4 -0.1654 -1.5 6.9 Her X-1 256.0210 -37.8038 9.5 42.0 -143.8 0.1232 1.2 2.9 4U 1700-377 256.5989 -36.5064 10.1 40.7 -143.1 0.1115 1.1 9.3 GX 349+2 262.8699 -24.7004 6.0 28.2 -136.4 -0.1285 -1.9 8.0 GX 1+4 264.8418 -44.5156 36.2 44.1 -157.3 -0.0299 -0.3 5.8 4U 1735-44 268.2278 -1.5767 6.0 13.4 -78.8 0.1054 1.9 11.2 SW J1753.5-0127 270.2130 -25.2174 3.5 24.8 -149.3 0.2087 3.3 9.1 GX 5-1 270.2498 -25.8899 24.7 25.4 -150.1 0.0287 0.5 9.3 GRS 1758-258 274.0944 -14.1126 31.7 13.4 -141.4 -0.0197 -0.4 6.9 GX 17+2 275.7547 -30.2471 6.6 27.8 -163.6 -0.1026 -1.7 11.4 H1820-303 285.0615 -25.0626 50.4 22.4 177.2 0.0134 0.2 8.6 HT1900.1-2455 288.7713 10.8509 16.8 15.6 32.9 0.0409 0.7 5.9 GRS 1915+105 299.4391 35.2110 16.9 41.7 27.7 0.0752 0.7 7.4 Cyg X-1 308.1278 40.9424 2.3 50.1 31.7 1.3535 5.0 1.0 Cyg X-3 262.8258 -33.7592 43.3 35.4 -147.0 0.0199 0.3 9.3 GX 354-0 257.7591 36.5542 1.2 45.3 -21.6 1.0245 10.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 359.100600 962.835500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 31.9618 -16.5955 2.3 10.5 122.9 1.4641 5.0 ------ UNKNOWN 45.3241 -13.3780 2.9 18.2 169.3 1.1540 4.0 ------ UNKNOWN 327.8559 -43.5322 2.7 53.8 -0.0 4.2199 4.3 ------ UNKNOWN 85.3579 2.8486 3.2 59.1 -166.1 8.5270 3.6 ------ UNKNOWN 83.1840 -16.3163 4.0 48.0 -146.4 2.5072 2.9 ------ UNKNOWN 1.7016 -75.3596 4.1 50.6 -44.6 4.8919 2.9 ------ UNKNOWN 51.8836 -69.3882 3.7 43.8 -64.0 5.6062 3.2 ------ UNKNOWN