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 Oct 5 00:22:36 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger591390
======================================================================
Trigger: 00591390 Segment: 000
BAT Trigger Time: 416264728 [s; MET]
Trigger Stop: 416264792 [s; MET]
UTC: 2014-03-11T21:05:16.252360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 209.300638813478 Dec: 0.611516972213103 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.81
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.81
Analysis Position: [ source = BAT ]
RA: 209.300638813478 Dec: 0.611516972213103 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 209.301 Dec: 0.611518 [deg; J2000]
{ 13h 57m 12.2s , 00d 36' 41.5" }
+/- 2.56447397761 [arcmin] (estimated 90% radius based on SNR)
SNR: 7.9230412483
Angular difference between the analysis and refined position is 0.021670 arcmin
Partial Coding Fraction: 0.1083984 [ including projection effects ]
Duration
T90: 70.4800000190735 +/- 7.58769950271438
Measured from: -2.19999998807907
to: 68.2800000309944 [s; relative to TRIGTIME]
T50: 41.1040000319481 +/- 10.9853371161529
Measured from: 13.160000026226
to: 54.2640000581741 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -2.40399998426437
to: -1.40399998426437 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.4559999704361
to: 72.216000020504 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.941197 1.228742 0.909888 0.291949
0.149606 0.144547 0.128412 0.118788 [error]
Peak 0.042913 0.050338 0.036702 0.013560
0.017621 0.017423 0.015373 0.014003 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 76.672 -4.456 72.216
T90 70.480 -2.200 68.280
T50 41.104 13.160 54.264
Peak 1.000 -2.404 -1.404
====== 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 -1.697 -0.239 0.232 - - - 2.95e-03 -4.10e-04 4.03e-04 57.400 57
CPL -1.484 -0.443 1.063 116.353 -116.353 -116.353 3.81e-03 N/A N/A 57.240 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 -1.728 -0.663 0.598 - - - 9.56e-03 -3.63e-03 3.45e-03 48.610 57
CPL -1.242 -0.901 4.197 75.559 -75.559 -75.559 1.72e-02 -1.72e-02 1.84e+00 48.520 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 3.48e-07 5.67e-07 6.99e-07 1.70e-06 2.10e-06 3.32e-06 erg/cm2
90%_error_low -7.20e-08 -7.46e-08 -1.30e-07 -5.82e-07 -3.02e-07 -7.09e-07 erg/cm2
90%_error_hi 7.58e-08 7.42e-08 1.29e-07 7.56e-07 3.07e-07 8.45e-07 erg/cm2
Peak flux PL 4.90e-01 4.31e-01 2.60e-01 2.37e-01 1.28e+00 1.42e+00 ph/cm2/s
90%_error_low -2.49e-01 -1.54e-01 -1.22e-01 -1.64e-01 -4.48e-01 -4.85e-01 ph/cm2/s
90%_error_hi 2.88e-01 1.51e-01 1.19e-01 2.85e-01 4.51e-01 4.86e-01 ph/cm2/s
Fluence CPL 3.37e-07 5.80e-07 7.06e-07 1.21e-06 2.06e-06 2.83e-06 erg/cm2
90%_error_low -8.60e-08 -8.55e-08 -1.34e-07 -8.88e-07 -3.43e-07 -9.74e-07 erg/cm2
90%_error_hi 7.94e-08 9.58e-08 1.37e-07 6.49e-07 3.33e-07 7.50e-07 erg/cm2
Peak flux CPL 4.54e-01 4.53e-01 2.70e-01 1.39e-01 1.26e+00 1.32e+00 ph/cm2/s
90%_error_low N/A -4.53e-01 -6.77e-02 -1.39e-01 -4.76e-01 -5.29e-01 ph/cm2/s
90%_error_hi N/A 2.05e-01 7.56e-02 1.74e-01 4.57e-01 5.47e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-50.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 209.301 0.612 0.000 40.828 56.049 1.630 7.923 TRIG_00591390 Image time interval: 0.000 to 64.000 [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 -4.456 sec. to 72.216 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.69699 ( -0.238552 0.232181 ) Norm@50keV : 2.95234E-03 ( -0.000409829 0.00040336 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.40 using 59 PHA bins. # Reduced chi-squared = 1.007 for 57 degrees of freedom # Null hypothesis probability = 4.601691e-01 Photon flux (15-150 keV) in 76.67 sec: 0.391708 ( -0.051586 0.05177 ) ph/cm2/s Energy fluence (15-150 keV) : 2.0966e-06 ( -3.02466e-07 3.06628e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.456 sec. to 72.216 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48441 ( -0.443377 1.06342 ) Epeak [keV] : 116.353 ( -116.356 -116.356 ) Norm@50keV : 3.81404E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.24 using 59 PHA bins. # Reduced chi-squared = 1.022 for 56 degrees of freedom # Null hypothesis probability = 4.287148e-01 Photon flux (15-150 keV) in 76.67 sec: 0.387709 ( -0.054508 0.053306 ) ph/cm2/s Energy fluence (15-150 keV) : 2.05933e-06 ( -3.42779e-07 3.33359e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -2.404 sec. to -1.404 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.72763 ( -0.663056 0.59838 ) Norm@50keV : 9.55920E-03 ( -0.00362942 0.00345212 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.61 using 59 PHA bins. # Reduced chi-squared = 0.8528 for 57 degrees of freedom # Null hypothesis probability = 7.777975e-01 Photon flux (15-150 keV) in 1 sec: 1.28213 ( -0.448326 0.45131 ) ph/cm2/s Energy fluence (15-150 keV) : 8.83426e-08 ( -3.31666e-08 3.40316e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.404 sec. to -1.404 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.24157 ( -0.900459 4.19795 ) Epeak [keV] : 75.5593 ( -75.6247 -75.6247 ) Norm@50keV : 1.71515E-02 ( -0.0171261 1.83895 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.52 using 59 PHA bins. # Reduced chi-squared = 0.8664 for 56 degrees of freedom # Null hypothesis probability = 7.509897e-01 Photon flux (15-150 keV) in 1 sec: 1.25919 ( -0.476078 0.45729 ) ph/cm2/s Energy fluence (15-150 keV) : 6.58688e-08 ( -1.50435e-08 5.58226e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 70.48 sec. Hardness ratio (energy fluence ratio) = 1.23375799268
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.146752e-07 S(50-150 keV) = 1.1819271e-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 = 0.482544112951, IMY = -0.716713783314
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: -15.699400 -4.456000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9351 -15.6474 1.3 48.0 0.3 0.5889 8.8 2.6 Sco X-1 254.6386 35.4886 0.0 15.0 -98.6 0.0432 1.3 12.5 Her X-1 268.2622 -1.4466 13.2 44.4 -37.1 0.0580 0.9 6.4 SW J1753.5-0127
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.456000 72.216000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0838 -15.6334 4.7 48.1 0.1 1.1505 2.4 6.0 Sco X-1 254.6385 35.4886 0.0 15.0 -98.6 -0.2796 -1.2 12.5 Her X-1 268.3792 -1.4459 7.3 44.5 -37.3 -0.7389 -1.6 0.8 SW J1753.5-0127 212.5762 -8.4142 1.7 46.6 44.9 6.7447 6.7 ------ UNKNOWN 287.9903 64.1218 2.4 44.9 -141.0 2.3880 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: -239.000000 422.998900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9824 -15.6402 0.4 48.0 0.3 26.0241 29.9 0.2 Sco X-1 254.5036 35.1977 10.4 14.8 -97.5 -0.4496 -1.1 9.0 Her X-1 268.4084 -1.3274 10.4 44.4 -37.4 -0.8748 -1.1 7.9 SW J1753.5-0127 183.2516 39.3644 2.7 43.8 126.0 7.5978 4.3 ------ UNKNOWN 226.3399 17.8856 3.2 17.0 48.1 1.4208 3.6 ------ UNKNOWN 157.7450 80.5137 4.0 56.9 179.2 8.7155 2.9 ------ UNKNOWN 244.5215 -15.6377 0.7 48.0 0.9 14.0946 16.9 ------ UNKNOWN 248.6741 -20.2972 2.2 53.3 -3.1 5.4568 5.2 ------ UNKNOWN