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 19 18:49:22 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger342121
======================================================================
Trigger: 00342121 Segment: 000
BAT Trigger Time: 255567799.296 [s; MET]
Trigger Stop: 255567803.392 [s; MET]
UTC: 2009-02-05T23:03:14.820740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 220.925433877431 Dec: -27.8637399346592 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 15.1327459504216 [ if not an image trigger ]
Image S/N Ratio: 8.16
Analysis Position: [ source = BAT ]
RA: 220.925433877431 Dec: -27.8637399346592 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 220.91650989556 Dec: -27.8492183299414 [deg; J2000]
{ 14h 43m 40.0s , -27d 50' 57.2" }
+/- 1.99605923167749 [arcmin] (estimated 90% radius based on SNR)
+/- 0.89193218931916 [arcmin] (formal 1-sigma fit error)
SNR: 11.3318078597344
Angular difference between the analysis and refined position is 0.991594 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 8.8120000064373 +/- 1.77945720942472
Measured from: -2.60400000214577
to: 6.20800000429153 [s; relative to TRIGTIME]
T50: 4.33200001716614 +/- 1.06734248169701
Measured from: 0.00799998641014099
to: 4.34000000357628 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.0799999833107
to: 5.0799999833107 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.9200000166893
to: 6.62399998307228 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.164760 0.171229 0.062367 -0.011050
0.016961 0.016448 0.013997 0.011884 [error]
Peak 0.030009 0.021611 0.009052 0.001841
0.005569 0.005361 0.004557 0.003763 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 9.544 -2.920 6.624
T90 8.812 -2.604 6.208
T50 4.332 0.008 4.340
Peak 1.000 4.080 5.080
====== 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 -2.005 -0.218 0.206 - - - 2.31e-03 -3.48e-04 3.41e-04 68.410 57
CPL -0.394 -1.116 1.484 38.420 -7.624 9.915 2.17e-02 -2.17e-02 1.55e-01 61.590 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 -1.980 -0.478 0.436 - - - 3.23e-03 -1.05e-03 1.02e-03 52.550 57
CPL 1.002 -3.273 5.715 32.358 -12.101 -32.358 3.23e-01 -3.23e-01 3.04e+03 50.340 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 4.53e-08 6.13e-08 6.10e-08 1.10e-07 2.03e-07 2.77e-07 erg/cm2
90%_error_low -7.01e-09 -7.21e-09 -1.22e-08 -3.75e-08 -2.85e-08 -5.32e-08 erg/cm2
90%_error_hi 7.17e-09 7.19e-09 1.26e-08 4.89e-08 2.93e-08 6.22e-08 erg/cm2
Peak flux PL 2.11e-01 1.60e-01 8.11e-02 5.90e-02 4.79e-01 5.11e-01 ph/cm2/s
90%_error_low -7.03e-02 -4.07e-02 -3.25e-02 -3.50e-02 -1.21e-01 -1.31e-01 ph/cm2/s
90%_error_hi 7.36e-02 4.06e-02 3.49e-02 5.87e-02 1.21e-01 1.32e-01 ph/cm2/s
Fluence CPL 4.09e-08 7.28e-08 5.09e-08 1.04e-08 1.74e-07 1.75e-07 erg/cm2
90%_error_low -8.16e-09 -1.06e-08 -1.73e-08 -8.63e-09 -2.76e-08 -2.90e-08 erg/cm2
90%_error_hi 8.06e-09 1.09e-08 1.67e-08 3.54e-08 3.24e-08 4.59e-08 erg/cm2
Peak flux CPL 1.99e-01 2.10e-01 3.38e-02 3.06e-04 4.42e-01 4.42e-01 ph/cm2/s
90%_error_low -8.07e-02 N/A -3.38e-02 -3.06e-04 -1.14e-01 -1.14e-01 ph/cm2/s
90%_error_hi 8.18e-02 N/A 6.80e-02 7.10e-02 1.18e-01 1.19e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 220.9165 -27.8492 0.0170 10.6095 -28.1507 0.3474018 11.332 TRIG_00342121 Foreground time interval of the image: -2.920 6.624 (delta_t = 9.544 [sec]) Background time interval of the image: -239.296 -2.920 (delta_t = 236.376 [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 -2.920 sec. to 6.624 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.00539 ( -0.218288 0.206298 ) Norm@50keV : 2.30738E-03 ( -0.000347606 0.000341427 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.41 using 59 PHA bins. # Reduced chi-squared = 1.200 for 57 degrees of freedom # Null hypothesis probability = 1.432287e-01 Photon flux (15-150 keV) in 9.544 sec: 0.346994 ( -0.040131 0.040132 ) ph/cm2/s Energy fluence (15-150 keV) : 2.03176e-07 ( -2.84685e-08 2.92642e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.920 sec. to 6.624 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.393526 ( -1.11703 1.48351 ) Epeak [keV] : 38.4201 ( -7.62275 9.91661 ) Norm@50keV : 2.16593E-02 ( -0.0216884 0.154552 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.59 using 59 PHA bins. # Reduced chi-squared = 1.100 for 56 degrees of freedom # Null hypothesis probability = 2.830214e-01 Photon flux (15-150 keV) in 9.544 sec: 0.329618 ( -0.04101 0.041301 ) ph/cm2/s Energy fluence (15-150 keV) : 1.73552e-07 ( -2.75594e-08 3.23974e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.080 sec. to 5.080 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.9798 ( -0.478599 0.436086 ) Norm@50keV : 3.22511E-03 ( -0.00105012 0.00102182 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.55 using 59 PHA bins. # Reduced chi-squared = 0.9219 for 57 degrees of freedom # Null hypothesis probability = 6.426421e-01 Photon flux (15-150 keV) in 1 sec: 0.479361 ( -0.121128 0.121129 ) ph/cm2/s Energy fluence (15-150 keV) : 2.97201e-08 ( -8.89678e-09 9.46491e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.080 sec. to 5.080 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.00168 ( -3.31664 5.67078 ) Epeak [keV] : 32.3582 ( -12.0331 -32.2907 ) Norm@50keV : 0.323216 ( -0.392821 3035.86 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.34 using 59 PHA bins. # Reduced chi-squared = 0.8990 for 56 degrees of freedom # Null hypothesis probability = 6.879205e-01 Photon flux (15-150 keV) in 1 sec: 0.442324 ( -0.11446 0.118464 ) ph/cm2/s Energy fluence (15-150 keV) : 2.10809e-08 ( -6.0692e-09 1.27747e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 8.812 sec. Hardness ratio (energy fluence ratio) = 0.996299643498
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.0655232e-07 S(50-150 keV) = 9.662307e-08
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 = 1.651591959193517E-01, IMY = 8.837470254186201E-02
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: -239.296000 -2.920000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2797 -60.5372 6.6 56.1 0.6 1.7050 1.7 5.3 Cen X-3 186.8535 -62.8233 5.2 51.2 -7.5 1.0728 2.2 6.3 GX 301-2 244.9670 -15.6373 0.3 23.4 -116.9 9.1958 41.4 0.7 Sco X-1 255.9805 -37.7941 1.8 37.2 -75.8 3.0398 6.4 3.0 4U 1700-377 256.4624 -36.3036 14.1 37.0 -78.3 0.3825 0.8 7.3 GX 349+2 263.1632 -24.8185 36.9 40.3 -98.2 0.2970 0.3 9.5 GX 1+4 196.4051 -26.3488 3.0 24.2 37.2 0.7688 3.8 ------ UNKNOWN 167.5647 -59.6132 3.0 56.9 2.3 3.8744 3.8 ------ UNKNOWN 221.7988 -22.4933 2.1 5.4 -38.7 0.9725 5.6 ------ UNKNOWN 250.4023 10.6094 3.0 40.6 -157.8 1.0367 3.9 ------ UNKNOWN 254.7683 -29.6631 2.5 33.6 -88.5 1.6575 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.920000 6.624000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3808 -60.6216 4.1 56.1 0.5 -0.4436 -2.8 1.9 Cen X-3 186.7226 -62.6324 26.4 51.1 -7.3 -0.0343 -0.4 8.5 GX 301-2 244.9716 -15.4864 7.0 23.5 -117.3 -0.0629 -1.6 9.2 Sco X-1 256.0712 -37.8905 3.6 37.3 -75.7 -0.2475 -3.2 4.9 4U 1700-377 256.6043 -36.4096 2.9 37.1 -78.2 -0.2995 -3.9 8.2 GX 349+2 262.8754 -24.8359 4.9 40.0 -98.2 0.2826 2.3 9.1 GX 1+4 199.2786 4.0488 2.2 29.9 106.9 0.2609 5.2 ------ UNKNOWN 220.9165 -27.8492 1.0 10.6 -28.2 0.3475 11.3 ------ UNKNOWN 254.3822 5.9580 2.5 40.7 -148.4 0.2306 4.7 ------ UNKNOWN 227.8518 -65.6710 2.8 48.7 -30.5 0.3070 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 71.404590 962.775200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.1857 -60.8082 5.6 47.1 13.3 -2.9303 -2.1 11.8 Cen X-3 186.7585 -62.7192 7.6 41.3 5.2 1.5554 1.5 4.2 GX 301-2 244.9709 -15.6459 0.2 25.4 -131.5 40.3182 62.5 0.6 Sco X-1 255.9982 -37.8216 0.8 30.9 -79.9 12.8250 14.2 1.5 4U 1700-377 256.3423 -36.4486 2.7 31.0 -82.6 4.0202 4.3 4.7 GX 349+2 263.1342 -24.6335 51.6 37.8 -102.7 0.3767 0.2 9.6 GX 1+4 264.6194 -44.4804 6.3 38.4 -70.2 2.6731 1.9 5.6 4U 1735-44 262.9114 -33.9073 5.3 36.3 -87.5 3.5469 2.2 5.8 GX 354-0 194.9534 -33.8193 3.4 23.0 50.8 2.3720 3.4 ------ UNKNOWN 225.7527 26.7976 3.9 54.9 167.6 12.0272 3.0 ------ UNKNOWN