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: Sat Jan 20 04:32:32 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger799669
======================================================================
Trigger: 00799669 Segment: 000
BAT Trigger Time: 535652720 [s; MET]
Trigger Stop: 535652800 [s; MET]
UTC: 2017-12-22T16:24:59.803500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 148.293325459001 Dec: 35.6217756112652 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.49
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.49
Analysis Position: [ source = BAT ]
RA: 148.293325459001 Dec: 35.6217756112652 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 148.271845515373 Dec: 35.6225456918433 [deg; J2000]
{ 09h 53m 05.2s , +35d 37' 21.2" }
+/- 1.66129134913719 [arcmin] (estimated 90% radius based on SNR)
+/- 0.601041693336903 [arcmin] (formal 1-sigma fit error)
SNR: 14.7297645026019
Angular difference between the analysis and refined position is 1.048650 arcmin
Partial Coding Fraction: 0.6015625 [ including projection effects ]
Duration
T90: 173.871999979019 +/- 23.8695096243794
Measured from: 12.8479999899864
to: 186.719999969006 [s; relative to TRIGTIME]
T50: 99.9399999380112 +/- 18.7910967328076
Measured from: 43
to: 142.939999938011 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 61.3439999818802
to: 62.3439999818802 [s; relative to TRIGTIME]
Total Fluence
Measured from: 8.00400000810623
to: 210.087999999523 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.387253 1.330209 0.671588 0.106928
0.102707 0.105154 0.088044 0.074649 [error]
Peak 0.032780 0.031063 0.012872 -0.001684
0.008587 0.008906 0.007150 0.005776 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 202.084 8.004 210.088
T90 173.872 12.848 186.720
T50 99.940 43.000 142.940
Peak 1.000 61.344 62.344
====== 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 -2.023 -0.171 0.164 - - - 1.01e-03 -1.11e-04 1.09e-04 58.870 57
CPL -1.893 -0.233 0.716 34.748 -25.406 -34.748 1.20e-03 -3.79e-04 1.88e-03 58.740 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -2.127 -0.752 0.582 - - - 4.19e-03 -1.94e-03 1.77e-03 39.650 57
CPL -1.847 -0.209 2.325 23.773 N/A N/A 6.06e-03 N/A N/A 39.610 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 4.26e-07 5.70e-07 5.62e-07 9.93e-07 1.88e-06 2.55e-06 erg/cm2
90%_error_low -5.34e-08 -4.96e-08 -8.40e-08 -2.68e-07 -1.92e-07 -3.66e-07 erg/cm2
90%_error_hi 5.46e-08 4.97e-08 8.52e-08 3.27e-07 1.95e-07 4.10e-07 erg/cm2
Peak flux PL 3.16e-01 2.20e-01 1.01e-01 6.44e-02 6.68e-01 7.02e-01 ph/cm2/s
90%_error_low -1.35e-01 -7.34e-02 -5.63e-02 -6.44e-02 -2.18e-01 -2.30e-01 ph/cm2/s
90%_error_hi 1.45e-01 7.24e-02 5.84e-02 9.24e-02 2.18e-01 2.31e-01 ph/cm2/s
Fluence CPL 4.22e-07 5.80e-07 5.59e-07 7.68e-07 1.86e-06 2.33e-06 erg/cm2
90%_error_low -5.88e-08 -7.44e-08 -9.00e-08 -5.28e-07 -2.28e-07 -5.94e-07 erg/cm2
90%_error_hi 5.36e-08 6.83e-08 8.72e-08 6.28e-07 2.13e-07 7.40e-07 erg/cm2
Peak flux CPL 3.08e-01 2.28e-01 1.02e-01 4.45e-02 6.65e-01 6.83e-01 ph/cm2/s
90%_error_low -1.55e-01 N/A N/A -4.45e-02 -2.20e-01 N/A ph/cm2/s
90%_error_hi 1.38e-01 N/A N/A 7.65e-02 2.17e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 148.2718 35.6225 0.0130 37.6289 4.1994 2.3282373 14.730 TRIG_00799669 Foreground time interval of the image: 8.004 89.301 (delta_t = 81.297 [sec]) Background time interval of the image: -239.000 8.004 (delta_t = 247.004 [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 8.004 sec. to 210.088 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.02276 ( -0.170767 0.163922 ) Norm@50keV : 1.00857E-03 ( -0.000111046 0.000108743 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.87 using 59 PHA bins. # Reduced chi-squared = 1.033 for 57 degrees of freedom # Null hypothesis probability = 4.070246e-01 Photon flux (15-150 keV) in 202.1 sec: 0.152902 ( -0.013389 0.013396 ) ph/cm2/s Energy fluence (15-150 keV) : 1.8825e-06 ( -1.91923e-07 1.9502e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.004 sec. to 210.088 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.89265 ( -0.232882 0.715882 ) Epeak [keV] : 34.7480 ( -25.4084 -34.7507 ) Norm@50keV : 1.19898E-03 ( -0.000379441 0.00187923 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.74 using 59 PHA bins. # Reduced chi-squared = 1.049 for 56 degrees of freedom # Null hypothesis probability = 3.752399e-01 Photon flux (15-150 keV) in 202.1 sec: 0.152118 ( -0.01395 0.013649 ) ph/cm2/s Energy fluence (15-150 keV) : 1.85633e-06 ( -2.28177e-07 2.12884e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 61.344 sec. to 62.344 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.12701 ( -0.751566 0.582488 ) Norm@50keV : 4.19165E-03 ( -0.00193912 0.00176756 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.65 using 59 PHA bins. # Reduced chi-squared = 0.6957 for 57 degrees of freedom # Null hypothesis probability = 9.610044e-01 Photon flux (15-150 keV) in 1 sec: 0.668443 ( -0.21774 0.217785 ) ph/cm2/s Energy fluence (15-150 keV) : 3.90607e-08 ( -1.50425e-08 1.5743e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 61.344 sec. to 62.344 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.84669 ( -0.209135 2.32453 ) Epeak [keV] : 23.7728 ( ) Norm@50keV : 6.06269E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.61 using 59 PHA bins. # Reduced chi-squared = 0.7072 for 56 degrees of freedom # Null hypothesis probability = 9.523624e-01 Photon flux (15-150 keV) in 1 sec: 0.664582 ( -0.219776 0.216519 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 173.872 sec. Hardness ratio (energy fluence ratio) = 0.984373674227
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.966345e-07 S(50-150 keV) = 8.858751e-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 = 7.688365867807131E-01, IMY = -5.645186769244518E-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: -239.000000 8.004000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.1503 33.0107 3.2 33.0 104.6 1.7261 3.6 ------ UNKNOWN 130.8375 33.6549 2.4 33.1 28.1 1.5938 4.8 ------ UNKNOWN 40.9265 61.4279 0.2 29.1 -174.6 15.5668 56.6 ------ UNKNOWN 347.4721 49.9252 3.2 57.3 -154.0 5.8465 3.6 ------ UNKNOWN 183.6776 29.3441 3.6 58.7 -25.8 6.4191 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 8.004000 89.300610 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 130.7981 40.7029 2.2 26.6 22.6 0.6754 5.3 ------ UNKNOWN 148.2718 35.6225 0.8 37.6 4.2 2.3282 14.7 ------ UNKNOWN 137.0188 61.9865 2.0 14.4 -32.5 0.6307 5.8 ------ UNKNOWN 167.2717 23.7478 2.9 56.1 -7.4 1.6484 4.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 158.500600 963.070700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 188.3721 50.7171 2.6 32.4 -132.7 2.9564 4.4 ------ UNKNOWN 234.8476 64.8095 3.7 56.8 -151.8 9.9779 3.1 ------ UNKNOWN