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 23:29:21 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger449549
======================================================================
Trigger: 00449549 Segment: 000
BAT Trigger Time: 322154836.48 [s; MET]
Trigger Stop: 322154837.504 [s; MET]
UTC: 2011-03-18T15:27:09.712860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 211.695156717948 Dec: -51.5589590244306 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.14
Image Trigger?: NO
Rate S/N Ratio: 11.4017542509914 [ if not an image trigger ]
Image S/N Ratio: 7.14
Analysis Position: [ source = BAT ]
RA: 211.695156717948 Dec: -51.5589590244306 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 211.692601322033 Dec: -51.566952568068 [deg; J2000]
{ 14h 06m 46.2s , -51d 34' 01.0" }
+/- 1.63519473318821 [arcmin] (estimated 90% radius based on SNR)
+/- 0.700347054148985 [arcmin] (formal 1-sigma fit error)
SNR: 15.0667340834447
Angular difference between the analysis and refined position is 0.488992 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 4.78799992799759 +/- 0.56483621211635
Measured from: -1.43999999761581
to: 3.34799993038177 [s; relative to TRIGTIME]
T50: 2.17599993944168 +/- 0.664207815756813
Measured from: 0.195999979972839
to: 2.37199991941452 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.755999982357025
to: 1.75599998235703 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.69200003147125
to: 3.68799996376038 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.057001 0.177325 0.124861 0.040713
0.014680 0.014155 0.012682 0.011578 [error]
Peak 0.026981 0.033930 0.025509 0.010671
0.006545 0.006226 0.005514 0.005105 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 5.380 -1.692 3.688
T90 4.788 -1.440 3.348
T50 2.176 0.196 2.372
Peak 1.000 0.756 1.756
====== 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 -1.092 -0.169 0.174 - - - 5.09e-03 -5.06e-04 5.06e-04 59.130 57
CPL -0.170 -0.750 0.938 103.265 -29.553 201.992 1.42e-02 -7.95e-03 2.57e-02 54.560 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 -1.322 -0.359 0.369 - - - 5.98e-03 -1.19e-03 1.19e-03 37.360 57
CPL -1.320 -0.359 1.098 9999.360 -9999.360 -9999.360 6.01e-03 -1.20e-03 3.34e-02 37.360 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 2.39e-08 5.64e-08 1.06e-07 4.80e-07 2.87e-07 6.66e-07 erg/cm2
90%_error_low -4.54e-09 -6.69e-09 -1.19e-08 -1.11e-07 -3.08e-08 -1.19e-07 erg/cm2
90%_error_hi 4.83e-09 6.61e-09 1.19e-08 1.34e-07 3.11e-08 1.39e-07 erg/cm2
Peak flux PL 2.08e-01 2.32e-01 1.86e-01 2.47e-01 7.17e-01 8.73e-01 ph/cm2/s
90%_error_low -7.28e-02 -5.24e-02 -4.58e-02 -1.07e-01 -1.44e-01 -1.79e-01 ph/cm2/s
90%_error_hi 8.05e-02 5.10e-02 4.51e-02 1.55e-01 1.45e-01 1.84e-01 ph/cm2/s
Fluence CPL 2.00e-08 6.12e-08 1.12e-07 1.46e-07 2.65e-07 3.40e-07 erg/cm2
90%_error_low -5.30e-09 -8.02e-09 -1.36e-08 -8.44e-08 -3.69e-08 -9.00e-08 erg/cm2
90%_error_hi 5.66e-09 8.39e-09 1.39e-08 2.23e-07 3.63e-08 2.21e-07 erg/cm2
Peak flux CPL 2.08e-01 2.33e-01 1.86e-01 2.47e-01 7.17e-01 8.72e-01 ph/cm2/s
90%_error_low -7.83e-02 -5.23e-02 -4.52e-02 -2.47e-01 -1.50e-01 -1.82e-01 ph/cm2/s
90%_error_hi 4.62e-02 5.74e-02 4.57e-02 7.93e-02 1.45e-01 1.71e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 211.6926 -51.5670 0.0127 17.7826 -61.1547 0.4218264 15.067 TRIG_00449549 Foreground time interval of the image: -1.692 3.688 (delta_t = 5.380 [sec]) Background time interval of the image: -239.480 -1.692 (delta_t = 237.788 [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 -1.692 sec. to 3.688 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.09207 ( -0.168714 0.173881 ) Norm@50keV : 5.09002E-03 ( -0.000506376 0.000505784 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.13 using 59 PHA bins. # Reduced chi-squared = 1.037 for 57 degrees of freedom # Null hypothesis probability = 3.975736e-01 Photon flux (15-150 keV) in 5.38 sec: 0.589967 ( -0.060346 0.060546 ) ph/cm2/s Energy fluence (15-150 keV) : 2.87067e-07 ( -3.08411e-08 3.1091e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.692 sec. to 3.688 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.169689 ( -0.750719 0.937909 ) Epeak [keV] : 103.265 ( -29.5294 202.015 ) Norm@50keV : 1.42240E-02 ( -0.00795314 0.0257012 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.56 using 59 PHA bins. # Reduced chi-squared = 0.9743 for 56 degrees of freedom # Null hypothesis probability = 5.294488e-01 Photon flux (15-150 keV) in 5.38 sec: 0.565135 ( -0.063821 0.063807 ) ph/cm2/s Energy fluence (15-150 keV) : 2.65431e-07 ( -3.69493e-08 3.63151e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.756 sec. to 1.756 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32248 ( -0.358539 0.369411 ) Norm@50keV : 5.98371E-03 ( -0.00119287 0.00118809 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.36 using 59 PHA bins. # Reduced chi-squared = 0.6554 for 57 degrees of freedom # Null hypothesis probability = 9.794809e-01 Photon flux (15-150 keV) in 1 sec: 0.716920 ( -0.144289 0.144898 ) ph/cm2/s Energy fluence (15-150 keV) : 5.88193e-08 ( -1.30978e-08 1.34227e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.756 sec. to 1.756 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32039 ( -0.359713 1.09773 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 6.00562E-03 ( -0.00119843 0.0334376 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.36 using 59 PHA bins. # Reduced chi-squared = 0.6671 for 56 degrees of freedom # Null hypothesis probability = 9.739346e-01 Photon flux (15-150 keV) in 1 sec: 0.717102 ( -0.150195 0.144501 ) ph/cm2/s Energy fluence (15-150 keV) : 5.88383e-08 ( -1.57658e-08 1.32691e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 4.788 sec. Hardness ratio (energy fluence ratio) = 1.87628843324
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.032096e-08 S(50-150 keV) = 2.067445e-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 = 1.547348947023835E-01, IMY = 2.809354982755758E-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: -239.480000 -1.692000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.6460 -60.7103 87.5 36.4 -24.7 0.0383 0.1 11.0 Cen X-3 186.6543 -62.7112 1.9 32.0 -36.4 1.6970 6.1 3.5 GX 301-2 244.9803 -15.6458 0.2 37.2 -165.8 15.4886 52.5 0.3 Sco X-1 256.0500 -37.7215 6.9 38.0 -125.7 -0.7161 -1.7 7.9 4U 1700-377 256.4179 -36.2559 19.9 38.6 -128.0 -0.2555 -0.6 10.1 GX 349+2 263.0271 -24.7796 19.1 47.5 -141.5 0.3702 0.6 2.3 GX 1+4 262.9665 -33.7869 7.8 44.4 -129.7 0.8815 1.5 3.1 GX 354-0 155.3300 -19.5907 2.2 49.4 37.1 5.5787 5.2 ------ UNKNOWN 223.1947 0.5241 2.4 36.9 148.8 1.9643 4.9 ------ UNKNOWN 166.5673 -49.1982 2.9 34.6 -4.7 1.0386 4.0 ------ UNKNOWN 259.3687 -3.7535 2.8 55.7 -166.8 2.9592 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.692000 3.688000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3047 -60.5969 4.1 36.4 -24.4 -0.0967 -2.8 1.6 Cen X-3 186.6118 -62.7618 5.4 32.1 -36.4 0.0679 2.1 1.3 GX 301-2 244.9755 -15.6059 2.6 37.2 -165.9 -0.1477 -4.5 2.1 Sco X-1 256.0357 -37.9884 6.1 38.0 -125.3 -0.0854 -1.9 9.0 4U 1700-377 256.5857 -36.3471 12.4 38.7 -127.8 -0.0414 -0.9 8.6 GX 349+2 262.9003 -24.7903 41.0 47.4 -141.5 0.0184 0.3 6.5 GX 1+4 262.9886 -33.6831 8.1 44.4 -129.9 0.0979 1.4 9.1 GX 354-0 229.8212 -6.5425 2.4 33.5 164.5 0.1655 4.8 ------ UNKNOWN 211.6926 -51.5670 0.8 17.8 -61.2 0.4219 15.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 56.820600 962.580900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5697 -40.5701 4.0 51.5 20.8 8.1917 2.9 2.1 Vela X-1 170.3873 -60.6615 5.7 24.3 2.2 -1.2027 -2.0 3.1 Cen X-3 186.6499 -62.7679 0.8 17.4 -9.4 7.6868 15.4 0.2 GX 301-2 244.9679 -15.6387 0.3 44.6 179.1 40.4429 39.2 0.7 Sco X-1 256.0515 -37.7722 43.9 33.8 -146.1 -0.1857 -0.3 5.3 4U 1700-377 256.3785 -36.4057 2.1 34.9 -147.6 4.1154 5.6 2.9 GX 349+2 263.0080 -24.7463 3.5 47.1 -154.3 4.4283 3.3 0.1 GX 1+4 264.5621 -44.2777 7.5 35.4 -130.2 1.4029 1.5 12.9 4U 1735-44 270.2854 -25.0798 10.9 51.3 -147.5 -1.7400 -1.1 0.1 GX 5-1 270.2970 -25.7430 31.1 50.8 -146.9 0.6045 0.4 0.3 GRS 1758-258 275.7537 -30.2089 24.8 51.0 -138.4 1.5262 0.5 13.0 H1820-303 262.9907 -33.8494 4.6 40.6 -145.0 2.4134 2.5 0.9 GX 354-0 229.0094 -38.1079 2.6 18.1 179.2 2.1713 4.4 ------ UNKNOWN 251.3843 -45.5059 2.5 26.6 -137.0 2.7975 4.5 ------ UNKNOWN 97.8550 -64.5498 3.0 53.2 -20.3 6.1049 3.8 ------ UNKNOWN 83.8053 -62.2678 3.8 59.0 -24.3 14.9796 3.0 ------ UNKNOWN 294.8699 -68.3172 2.6 41.0 -83.7 11.6593 4.4 ------ UNKNOWN