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: Thu Mar 17 18:00:38 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger676595
======================================================================
Trigger: 00676595 Segment: 000
BAT Trigger Time: 478373688.384 [s; MET]
Trigger Stop: 478373689.408 [s; MET]
UTC: 2016-02-28T17:34:32.475720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 107.322435346999 Dec: 26.9564510226191 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.09
Image Trigger?: NO
Rate S/N Ratio: 29.9165506033032 [ if not an image trigger ]
Image S/N Ratio: 10.09
Analysis Position: [ source = BAT ]
RA: 107.322435346999 Dec: 26.9564510226191 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 107.315275107078 Dec: 26.9511857867491 [deg; J2000]
{ 07h 09m 15.7s , +26d 57' 04.3" }
+/- 1.35075461417458 [arcmin] (estimated 90% radius based on SNR)
+/- 0.608133391071857 [arcmin] (formal 1-sigma fit error)
SNR: 19.7961429085091
Angular difference between the analysis and refined position is 0.496437 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 98.9079999923706 +/- 23.8907387298692
Measured from: 2.07599997520447
to: 100.983999967575 [s; relative to TRIGTIME]
T50: 47.595999956131 +/- 4.79087295793669
Measured from: 11.972000002861
to: 59.567999958992 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.00800001621246338
to: 0.991999983787537 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00800001621246338
to: 119.579999983311 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.766920 1.042985 0.898947 0.278507
0.056938 0.059391 0.051974 0.045300 [error]
Peak 0.025637 0.036924 0.067979 0.028048
0.006034 0.006409 0.006376 0.005479 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 119.588 -0.008 119.580
T90 98.908 2.076 100.984
T50 47.596 11.972 59.568
Peak 1.000 -0.008 0.992
====== 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 -1.301 -0.108 0.109 - - - 1.64e-03 -9.60e-05 9.60e-05 41.180 57
CPL -1.219 -0.183 0.378 509.538 -509.538 -509.538 1.79e-03 -2.43e-04 8.63e-04 41.220 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 -0.383 -0.250 0.273 - - - 9.63e-03 -1.55e-03 1.48e-03 42.190 57
CPL -0.374 -0.249 0.386 9999.360 -9999.360 -9999.360 9.73e-03 -1.57e-03 7.85e-03 42.220 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 2.07e-07 4.31e-07 6.99e-07 2.55e-06 1.93e-06 3.89e-06 erg/cm2
90%_error_low -2.33e-08 -2.88e-08 -5.11e-08 -4.00e-07 -1.26e-07 -4.34e-07 erg/cm2
90%_error_hi 2.42e-08 2.86e-08 5.09e-08 4.51e-07 1.27e-07 4.77e-07 erg/cm2
Peak flux PL 1.38e-01 2.72e-01 4.16e-01 1.40e+00 1.17e+00 2.22e+00 ph/cm2/s
90%_error_low -4.59e-02 -5.98e-02 -4.84e-02 -3.52e-01 -1.47e-01 -3.37e-01 ph/cm2/s
90%_error_hi 5.51e-02 6.06e-02 4.82e-02 4.43e-01 1.48e-01 3.94e-01 ph/cm2/s
Fluence CPL 2.07e-07 4.35e-07 7.01e-07 2.45e-06 1.93e-06 3.57e-06 erg/cm2
90%_error_low -3.17e-08 -3.29e-08 -5.42e-08 -1.11e-06 -1.42e-07 -8.78e-07 erg/cm2
90%_error_hi 2.05e-08 2.93e-08 5.74e-08 3.47e-07 1.32e-07 4.48e-07 erg/cm2
Peak flux CPL 1.37e-01 2.72e-01 4.15e-01 1.40e+00 1.17e+00 2.04e+00 ph/cm2/s
90%_error_low N/A -6.01e-02 -4.65e-02 -6.31e-01 -1.38e-01 -5.00e-01 ph/cm2/s
90%_error_hi N/A 4.50e-02 5.00e-02 4.37e-01 1.46e-01 5.58e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 107.3153 26.9512 0.0097 21.6749 35.3397 0.9820134 19.796 TRIG_00676595 Foreground time interval of the image: -0.008 17.917 (delta_t = 17.925 [sec]) Background time interval of the image: -787.183 -771.961 (delta_t = 15.222 [sec]) -239.384 -0.008 (delta_t = 239.376 [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 -0.008 sec. to 119.580 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.301 ( -0.108439 0.108959 ) Norm@50keV : 1.63628E-03 ( -9.60421e-05 9.60146e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.18 using 59 PHA bins. # Reduced chi-squared = 0.7224 for 57 degrees of freedom # Null hypothesis probability = 9.432745e-01 Photon flux (15-150 keV) in 119.6 sec: 0.195251 ( -0.011913 0.011944 ) ph/cm2/s Energy fluence (15-150 keV) : 1.93362e-06 ( -1.26276e-07 1.27014e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 119.580 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29721 ( -0.178346 0.382289 ) Epeak [keV] : 9995.80 ( -9995.31 -9995.31 ) Norm@50keV : 1.64313E-03 ( -9.63514e-05 0.00100994 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 41.17 using 59 PHA bins. # Reduced chi-squared = 0.7352 for 56 degrees of freedom # Null hypothesis probability = 9.310547e-01 Photon flux (15-150 keV) in 119.6 sec: 0.195000 ( -0.012839 0.012292 ) ph/cm2/s Energy fluence (15-150 keV) : 1.93055e-06 ( -1.42367e-07 1.31845e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.008 sec. to 0.992 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.382976 ( -0.250281 0.272879 ) Norm@50keV : 9.63035E-03 ( -0.00155281 0.00147929 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.19 using 59 PHA bins. # Reduced chi-squared = 0.7402 for 57 degrees of freedom # Null hypothesis probability = 9.286025e-01 Photon flux (15-150 keV) in 1 sec: 1.16583 ( -0.14684 0.14803 ) ph/cm2/s Energy fluence (15-150 keV) : 1.37553e-07 ( -1.64988e-08 1.65106e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.992 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.374378 ( -0.249536 0.385419 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 9.72986E-03 ( -0.00157272 0.00785558 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.22 using 59 PHA bins. # Reduced chi-squared = 0.7539 for 56 degrees of freedom # Null hypothesis probability = 9.136209e-01 Photon flux (15-150 keV) in 1 sec: 1.16764 ( -0.13787 0.14649 ) ph/cm2/s Energy fluence (15-150 keV) : 5.72888e-10 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 98.908 sec. Hardness ratio (energy fluence ratio) = 1.62341686464
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.380516e-07 S(50-150 keV) = 1.2955582e-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 = 3.242073016236385E-01, IMY = -2.298890802045160E-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: -787.183400 -771.961400 -239.384000 -0.008000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6318 22.0142 0.2 16.4 -34.9 10.5889 54.3 0.1 Crab 134.4779 10.4815 3.1 39.7 86.8 3.4717 3.7 ------ UNKNOWN 92.0826 36.5656 2.6 27.5 -1.5 0.9774 4.5 ------ UNKNOWN 80.7434 61.3776 2.9 53.2 -5.8 2.2083 4.0 ------ UNKNOWN 62.6885 -20.9474 2.4 43.2 -132.2 2.3952 4.8 ------ UNKNOWN 50.8183 22.9950 3.0 43.8 -64.0 4.2249 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.008000 17.916590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7789 22.1780 0.0 16.4 -34.2 0.1489 3.3 12.7 Crab 107.3153 26.9512 0.6 21.7 35.3 0.9820 19.8 ------ UNKNOWN 96.6223 -48.0676 2.3 57.3 -179.7 1.3448 4.9 ------ UNKNOWN 93.9367 -12.9028 2.0 22.1 -177.0 0.2548 5.8 ------ UNKNOWN 55.3440 56.3326 2.4 56.1 -22.6 0.8806 4.9 ------ UNKNOWN 52.2276 13.3678 2.5 41.4 -77.9 0.8640 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 62.116610 949.916600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6333 22.0205 0.2 22.1 -107.6 37.2313 59.8 0.4 Crab 115.2800 64.2915 3.1 37.7 -4.2 3.1108 3.7 ------ UNKNOWN 116.2055 71.5212 2.4 44.8 -5.9 4.9693 4.8 ------ UNKNOWN 68.9371 -9.7386 3.0 52.3 -139.2 11.5141 3.8 ------ UNKNOWN 56.8037 43.5004 3.1 43.7 -64.0 11.5280 3.7 ------ UNKNOWN 61.2034 27.3767 3.9 40.8 -88.3 8.6557 3.0 ------ UNKNOWN