batgrbproduct analysis for trigger=796469
batgrbproduct Analysis for Trigger=796469
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Tue Dec 12 10:25:04 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger796469/batgroup_hand_proc
======================================================================
Trigger: 00796469 Segment: 000
BAT Trigger Time: 534677273.088 [s; MET]
Trigger Stop: 534677274.112 [s; MET]
UTC: 2017-12-11T09:27:32.949900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 98.108012249038 Dec: -58.669689444389 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.03
Image Trigger?: NO
Rate S/N Ratio: 21.0475651798492 [ if not an image trigger ]
Image S/N Ratio: 11.03
Flight Position: [ source = BAT ]
RA: 98.108012249038 Dec: -58.669689444389 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 98.1452289806442 Dec: -58.6881597941355 [deg; J2000]
{ 06h 32m 34.9s , -58d 41' 17.4" }
+/- 1.75106632086887 [arcmin] (estimated 90% radius based on SNR)
+/- 0.887388504858632 [arcmin] (formal 1-sigma fit error)
SNR: 13.6629111498022
Angular difference between Flight and Ground position is 1.604864 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 2.17600005865097 +/- 0.455367963461657
Measured from: 0.0799999833106995
to: 2.25600004196167 [s; relative to TRIGTIME]
T50: 0.76800000667572 +/- 0.389625496896741
Measured from: 0.38400000333786
to: 1.15200001001358 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0360000133514404
to: 1.03600001335144 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0320000052452087
to: 2.63999998569489 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.106308 0.167052 0.100035 0.018681
0.015795 0.016757 0.014705 0.011871 [error]
Peak 0.061975 0.111926 0.072538 0.013629
0.010041 0.011422 0.010216 0.007738 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== 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 Power-law 4.21e-08 6.66e-08 7.93e-08 1.84e-07 2.41e-07 3.72e-07 erg/cm2
Error 7.62e-09 7.97e-09 1.38e-08 6.48e-08 3.29e-08 7.81e-08 erg/cm2
Peak flux Power-law 7.72e-01 7.54e-01 5.14e-01 5.51e-01 2.26e+00 2.59e+00 ph/cm2/s
Error 1.51e-01 9.57e-02 8.05e-02 1.69e-01 2.79e-01 3.20e-01 ph/cm2/s
Fluence Cutoff-PL 3.90e-08 7.27e-08 7.99e-08 6.37e-08 2.27e-07 2.55e-07 erg/cm2
Error 8.59e-09 1.12e-08 1.58e-08 9.86e-08 3.74e-08 1.06e-07 erg/cm2
Peak flux Cutoff-PL 6.97e-01 8.23e-01 5.40e-01 2.39e-01 2.22e+00 2.30e+00 ph/cm2/s
Error 1.69e-01 1.26e-01 9.22e-02 2.46e-01 2.83e-01 3.62e-01 ph/cm2/s
Fluence Band 3.62e-08 7.75e-08 7.47e-08 1.21e-07 2.30e-07 3.12e-07 erg/cm2
Error 9.64e-09 -------- 1.55e-08 -------- 3.42e-08 -------- erg/cm2
Peak flux Band 6.01e-01 9.24e-01 4.99e-01 3.72e-01 2.19e+00 2.39e+00 ph/cm2/s
Error 1.86e-01 -------- 8.92e-02 -------- 2.81e-01 3.32e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.747 0.205 - - 1.00e-02 1.32e-03 54.050 57
CPL 1.042 0.955 61.1 -22.0 2.45e-02 4.69e-02 52.130 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.552 0.198 - - 1.79e-02 2.26e-03 74.750 57
CPL 0.796 0.903 75.3 -26.6 4.53e-02 7.12e-02 72.130 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.832000 sec.
T50 in the 50-300 keV band: 0.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.608 0.032 2.640
T90 2.176 0.080 2.256
T50 0.768 0.384 1.152
Peak 1.000 0.036 1.036
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
98.1452 -58.6882 0.0141 39.6 -2.2 0.4073 13.7 TRIG_00796469
------------------------------------------
Foreground time interval of the image:
0.032 2.640 (delta_t = 2.608 [sec])
Background time interval of the image:
-239.088 0.032 (delta_t = 239.120 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.032 sec. to 2.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74741 ( -0.200929 0.208249 )
Norm@50keV : 1.00224E-02 ( -0.00132555 0.00130466 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.05 using 59 PHA bins.
# Reduced chi-squared = 0.9483 for 57 degrees of freedom
# Null hypothesis probability = 5.863323e-01
Photon flux (15-150 keV) in 2.608 sec: 1.35390 ( -0.163277 0.163442 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41226e-07 ( -3.26764e-08 3.31086e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.032 sec. to 2.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04206 ( -1.11298 0.797677 )
Epeak [keV] : 61.0528 ( -17.0324 -61.063 )
Norm@50keV : 2.45443E-02 ( -0.0153439 0.0784609 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.13 using 59 PHA bins.
# Reduced chi-squared = 0.9308 for 56 degrees of freedom
# Null hypothesis probability = 6.222894e-01
Photon flux (15-150 keV) in 2.608 sec: 1.32266 ( -0.16856 0.16808 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2729e-07 ( -3.72193e-08 3.7495e-08 ) ergs/cm2
Band function
Time interval is from 0.032 sec. to 2.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.36691 ( -1.9938 -0.499388 )
beta : -2.12359 ( 2.09629 0.366554 )
Epeak [keV] : 35.4944 ( -12.2658 51.2814 )
Norm@50keV : 1.02873 ( -0.998668 181.998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.96 using 59 PHA bins.
# Reduced chi-squared = 0.9083 for 55 degrees of freedom
# Null hypothesis probability = 6.672184e-01
Photon flux (15-150 keV) in 2.608 sec: 0.0 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29551e-07 ( -2.29533e-07 -3.39762e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4436 (-1.49235 1.77433)
R^2/D10^2 : 0.398640 (-0.166291 0.272645)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.44 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.889257e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.864e-08 6.126e-09
25- 50 8.513e-08 1.251e-08
50-150 6.485e-08 1.843e-08
15-150 1.786e-07 2.904e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 112.395 (-40.5751 83.2568)
Norm : 5.84228 (-0.859587 1.12775)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.28 using 59 PHA bins.
# Reduced chi-squared = 0.9172 for 57 degrees of freedom
# Null hypothesis probability = 6.524095e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.977e-08 6.807e-09
25- 50 7.033e-08 1.305e-08
50-150 1.214e-07 6.197e-08
15-150 2.315e-07 7.070e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.39117 (-2.15492 2.11793)
R1^2/D10^2 : 0.995205 (-0.512775 1.44131)
kT2 [keV] : 32.7981 (-14.6666 -32.9404)
R2^2/D10^2 : 5.16149E-03 (-0.00508544 0.0432562)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.66 using 59 PHA bins.
# Reduced chi-squared = 0.9028 for 55 degrees of freedom
# Null hypothesis probability = 6.782767e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.630e-08 1.732e-08
25- 50 7.852e-08 3.542e-08
50-150 1.197e-07 6.303e-08
15-150 2.345e-07 1.025e-07
Peak spectrum fit
Power-law model
Time interval is from 0.036 sec. to 1.036 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55197 ( -0.195765 0.199384 )
Norm@50keV : 1.78537E-02 ( -0.00226748 0.0022499 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.75 using 59 PHA bins.
# Reduced chi-squared = 1.311 for 57 degrees of freedom
# Null hypothesis probability = 5.738340e-02
Photon flux (15-150 keV) in 1 sec: 2.26151 ( -0.27861 0.278819 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6803e-07 ( -2.28647e-08 2.30967e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.036 sec. to 1.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.795928 ( -1.01311 0.793335 )
Epeak [keV] : 75.2825 ( -22.1524 -75.2834 )
Norm@50keV : 4.52693E-02 ( -0.0277997 0.114592 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.13 using 59 PHA bins.
# Reduced chi-squared = 1.288 for 56 degrees of freedom
# Null hypothesis probability = 7.218848e-02
Photon flux (15-150 keV) in 1 sec: 2.21680 ( -0.28304 0.28305 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59126e-07 ( -2.5499e-08 2.5313e-08 ) ergs/cm2
Band function
Time interval is from 0.036 sec. to 1.036 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.04819 ( -0.647086 0.735954 )
beta : -1.95334 ( 9.37167 19.3717 )
Epeak [keV] : 35.0458 ( -19.8559 498.599 )
Norm@50keV : 18.1363 ( -18.1191 169.743 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.35 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 55 degrees of freedom
# Null hypothesis probability = 1.065603e-01
Photon flux (15-150 keV) in 1 sec: 2.19497 ( 4.80503 -0.28015 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60155e-07 ( -1.60148e-07 -2.3559e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8399 (-1.75777 2.15924)
R^2/D10^2 : 0.456256 (-0.19632 0.320145)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.41 using 59 PHA bins.
# Reduced chi-squared = 1.446 for 57 degrees of freedom
# Null hypothesis probability = 1.549264e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.595e-08 3.295e-09
25- 50 5.421e-08 9.320e-09
50-150 5.610e-08 1.429e-08
15-150 1.263e-07 2.075e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 184.359 (-79.0081 -184.22)
Norm : 9.33605 (-1.16092 1.33264)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.92 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 57 degrees of freedom
# Null hypothesis probability = 7.599422e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.348e-08 1.300e-08
25- 50 4.474e-08 2.373e-08
50-150 9.554e-08 5.300e-08
15-150 1.637e-07 8.815e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.00999 (-2.00635 2.19211)
R1^2/D10^2 : 1.23508 (-0.617362 1.11994)
kT2 [keV] : 35.5034 (-13.6541 90.9173)
R2^2/D10^2 : 8.06512E-03 (-0.00803426 0.0417513)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.87 using 59 PHA bins.
# Reduced chi-squared = 1.234 for 55 degrees of freedom
# Null hypothesis probability = 1.141570e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.096e-08 9.961e-09
25- 50 5.095e-08 2.275e-08
50-150 9.253e-08 4.896e-08
15-150 1.644e-07 7.738e-08
Plot creation:
Tue Dec 12 10:31:38 EST 2017