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 Mar 17 22:48:00 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger883600
======================================================================
Trigger: 00883600 Segment: 000
BAT Trigger Time: 569128272 [s; MET]
Trigger Stop: 569128448 [s; MET]
UTC: 2019-01-14T03:10:49.754020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 65.5439596830878 Dec: 2.16981163299757 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.28
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.28
Analysis Position: [ source = BAT ]
RA: 65.5439596830878 Dec: 2.16981163299757 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 65.5427191335137 Dec: 2.19548877595504 [deg; J2000]
{ 04h 22m 10.3s , +02d 11' 43.8" }
+/- 1.65619964690288 [arcmin] (estimated 90% radius based on SNR)
+/- 0.87371716239663 [arcmin] (formal 1-sigma fit error)
SNR: 14.7944987225082
Angular difference between the analysis and refined position is 1.542423 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 67.095999956131 +/- 9.82942278698472
Measured from: 128.067999958992
to: 195.163999915123 [s; relative to TRIGTIME]
T50: 37.0239999294281 +/- 7.78437533283271
Measured from: 137.212000012398
to: 174.235999941826 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 151.075999975204
to: 152.075999975204 [s; relative to TRIGTIME]
Total Fluence
Measured from: 126.399999976158
to: 199.580000042915 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.637893 0.554813 0.319688 -0.028791
0.059708 0.061753 0.054119 0.046843 [error]
Peak 0.023823 0.019453 0.017094 0.006931
0.007658 0.007591 0.006786 0.005583 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 73.180 126.400 199.580
T90 67.096 128.068 195.164
T50 37.024 137.212 174.236
Peak 1.000 151.076 152.076
====== 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 -2.055 -0.226 0.211 - - - 1.19e-03 -1.86e-04 1.81e-04 48.290 57
CPL -1.388 -0.722 0.964 36.531 -30.013 -36.531 2.97e-03 -2.97e-03 8.33e-03 46.230 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 -1.508 -0.672 0.648 - - - 4.34e-03 -1.56e-03 1.47e-03 39.610 57
CPL -1.533 -0.650 0.679 9999.360 -9999.360 -9999.360 4.30e-03 N/A N/A 39.620 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 1.87e-07 2.46e-07 2.36e-07 4.05e-07 8.03e-07 1.07e-06 erg/cm2
90%_error_low -2.82e-08 -2.89e-08 -4.92e-08 -1.43e-07 -1.14e-07 -2.08e-07 erg/cm2
90%_error_hi 2.87e-08 2.87e-08 5.10e-08 1.88e-07 1.17e-07 2.43e-07 erg/cm2
Peak flux PL 1.80e-01 1.80e-01 1.27e-01 1.42e-01 5.44e-01 6.29e-01 ph/cm2/s
90%_error_low -9.70e-02 -6.53e-02 -5.80e-02 -9.78e-02 -1.80e-01 -2.09e-01 ph/cm2/s
90%_error_hi 1.10e-01 6.17e-02 5.50e-02 1.80e-01 1.80e-01 2.14e-01 ph/cm2/s
Fluence CPL 1.79e-07 2.67e-07 2.24e-07 1.26e-07 7.49e-07 7.97e-07 erg/cm2
90%_error_low -3.09e-08 -3.58e-08 -6.05e-08 -9.44e-08 -1.21e-07 -1.60e-07 erg/cm2
90%_error_hi 3.07e-08 3.92e-08 5.73e-08 3.86e-07 1.31e-07 4.02e-07 erg/cm2
Peak flux CPL 1.85e-01 1.80e-01 1.26e-01 1.61e-01 5.46e-01 6.36e-01 ph/cm2/s
90%_error_low N/A -6.52e-02 N/A N/A -1.84e-01 -2.24e-01 ph/cm2/s
90%_error_hi N/A 6.40e-02 N/A N/A 1.80e-01 2.09e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 65.5427 2.1955 0.0130 23.1849 34.3301 1.4600142 14.794 TRIG_00883600 Foreground time interval of the image: 126.400 185.101 (delta_t = 58.701 [sec]) Background time interval of the image: -239.000 126.400 (delta_t = 365.400 [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 126.400 sec. to 199.580 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.0555 ( -0.225798 0.210763 ) Norm@50keV : 1.18608E-03 ( -0.000185557 0.000181408 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.29 using 59 PHA bins. # Reduced chi-squared = 0.8472 for 57 degrees of freedom # Null hypothesis probability = 7.875519e-01 Photon flux (15-150 keV) in 73.18 sec: 0.182622 ( -0.020737 0.020738 ) ph/cm2/s Energy fluence (15-150 keV) : 8.03472e-07 ( -1.13785e-07 1.1713e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 126.400 sec. to 199.580 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.38802 ( -0.722075 0.963758 ) Epeak [keV] : 36.5311 ( -30.0131 -36.5311 ) Norm@50keV : 2.97046E-03 ( -0.00297044 0.00832533 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.23 using 59 PHA bins. # Reduced chi-squared = 0.8255 for 56 degrees of freedom # Null hypothesis probability = 8.209707e-01 Photon flux (15-150 keV) in 73.18 sec: 0.178868 ( -0.021039 0.021116 ) ph/cm2/s Energy fluence (15-150 keV) : 7.49173e-07 ( -1.20967e-07 1.3103e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 151.076 sec. to 152.076 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.50802 ( -0.671833 0.647681 ) Norm@50keV : 4.34450E-03 ( -0.00155799 0.00146642 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.61 using 59 PHA bins. # Reduced chi-squared = 0.6950 for 57 degrees of freedom # Null hypothesis probability = 9.614146e-01 Photon flux (15-150 keV) in 1 sec: 0.543557 ( -0.179698 0.179947 ) ph/cm2/s Energy fluence (15-150 keV) : 4.11652e-08 ( -1.55227e-08 1.59353e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 151.076 sec. to 152.076 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.20719 ( -0.651457 0.677248 ) Epeak [keV] : 76.3959 ( -9999.36 -9999.36 ) Norm@50keV : 1.85165E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.17 using 59 PHA bins. # Reduced chi-squared = 0.6994 for 56 degrees of freedom # Null hypothesis probability = 9.573356e-01 Photon flux (15-150 keV) in 1 sec: 0.545585 ( -0.184032 0.179953 ) ph/cm2/s Energy fluence (15-150 keV) : 2.30877e-08 ( -1.82104e-08 1.21218e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 67.096 sec. Hardness ratio (energy fluence ratio) = 0.962299200894
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.329158e-07 S(50-150 keV) = 3.705658e-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 = 3.536813571934281E-01, IMY = -2.415373204495026E-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: -239.000000 126.400000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 133.0720 -43.2197 3.0 56.8 173.8 6.6132 3.8 ------ UNKNOWN 27.8846 1.1571 3.9 46.4 -22.2 1.7659 3.0 ------ UNKNOWN 30.0919 -45.5934 4.2 40.9 -92.1 4.0189 2.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 126.400000 185.100590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 65.5428 2.1955 0.8 23.2 34.3 1.4600 14.8 ------ UNKNOWN 118.6291 -41.6408 2.5 46.1 173.5 1.0018 4.6 ------ UNKNOWN 34.3262 -11.8391 2.4 35.0 -36.1 0.6544 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 235.500600 963.123700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6329 22.0204 0.3 26.5 65.9 30.7920 35.9 0.4 Crab 82.0057 -37.6819 3.2 42.7 -173.6 4.5376 3.6 ------ UNKNOWN 28.1613 -1.1086 4.2 37.5 -68.9 5.0106 2.7 ------ UNKNOWN 62.1261 -54.4953 3.2 56.7 -151.9 15.4541 3.6 ------ UNKNOWN