batgrbproduct analysis for trigger=796778
batgrbproduct Analysis for Trigger=796778
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 22:38:12 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger796778/batgroup_hand_proc
======================================================================
Trigger: 00796778 Segment: 000
BAT Trigger Time: 534772661.824 [s; MET]
Trigger Stop: 534772665.92 [s; MET]
UTC: 2017-12-12T11:57:21.680200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 293.900492945572 Dec: 20.5684683791818 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.35
Image Trigger?: NO
Rate S/N Ratio: 9.48683298050514 [ if not an image trigger ]
Image S/N Ratio: 7.35
Flight Position: [ source = BAT ]
RA: 293.900492945572 Dec: 20.5684683791818 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.920200204549 Dec: 20.5971205474032 [deg; J2000]
{ 19h 35m 40.8s , +20d 35' 49.6" }
+/- 1.65358001292151 [arcmin] (estimated 90% radius based on SNR)
+/- 0.781515859916436 [arcmin] (formal 1-sigma fit error)
SNR: 14.827992565388
Angular difference between Flight and Ground position is 2.044690 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 320 +/- 72
Measured from: -28.8240000009537
to: 291.175999999046 [s; relative to TRIGTIME]
T50: 80 +/- 16
Measured from: 3.17599999904633
to: 83.1759999990463 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 90.6759999990463
to: 91.6759999990463 [s; relative to TRIGTIME]
Total Fluence
Measured from: -28.8240000009537
to: 371.175999999046 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.858889 2.561330 1.078455 0.074652
0.139273 0.142036 0.124417 0.118717 [error]
Peak 0.036049 0.029410 0.012622 0.002109
0.007005 0.007280 0.006202 0.005612 [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 9.08e-07 1.07e-06 9.17e-07 1.33e-06 3.37e-06 4.23e-06 erg/cm2
Error 8.57e-08 7.11e-08 1.16e-07 3.33e-07 2.60e-07 4.64e-07 erg/cm2
Peak flux Power-law 3.76e-01 2.39e-01 9.83e-02 5.48e-02 7.42e-01 7.69e-01 ph/cm2/s
Error 1.09e-01 6.02e-02 4.81e-02 5.05e-02 1.70e-01 1.81e-01 ph/cm2/s
Fluence Cutoff-PL 8.70e-07 1.13e-06 8.72e-07 5.38e-07 3.18e-06 3.41e-06 erg/cm2
Error 9.67e-08 9.47e-08 1.38e-07 4.34e-07 3.22e-07 7.43e-07 erg/cm2
Peak flux Cutoff-PL 3.76e-01 2.41e-01 9.76e-02 4.64e-02 7.40e-01 7.59e-01 ph/cm2/s
Error 1.12e-01 7.80e-02 6.20e-02 5.87e-02 1.74e-01 1.93e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.228 0.138 - - 8.93e-04 8.05e-05 58.520 57
CPL 1.732 0.472 21.4 0.0 1.75e-03 0.00e+00 56.280 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.283 0.509 - - 4.28e-03 1.59e-03 54.740 57
CPL 1.931 0.000 7.1 0.0 7.16e-03 0.00e+00 54.780 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: 91.392000 sec.
T50 in the 50-300 keV band: 64.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 400.000 -28.824 371.176
T90 320.000 -28.824 291.176
T50 80.000 3.176 83.176
Peak 1.000 90.676 91.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.9202 +20.5971 0.0129 24.1 -107.4 2.2862 14.8 TRIG_00796778
------------------------------------------
Foreground time interval of the image:
-28.824 34.677 (delta_t = 63.501 [sec])
Background time interval of the image:
-618.323 -601.424 (delta_t = 16.899 [sec])
-239.824 -202.315 (delta_t = 37.509 [sec])
-198.824 -28.824 (delta_t = 170.000 [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 -28.824 sec. to 371.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22811 ( -0.135591 0.140958 )
Norm@50keV : 8.93029E-04 ( -8.11012e-05 7.99711e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.52 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.194652e-01
Photon flux (15-150 keV) in 400 sec: 0.150064 ( -0.00984619 0.0098556 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37244e-06 ( -2.57426e-07 2.6173e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -28.824 sec. to 371.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73231 ( -0.653836 0.289538 )
Epeak [keV] : 21.4085 ( )
Norm@50keV : 1.75048E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.28 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 56 degrees of freedom
# Null hypothesis probability = 4.645207e-01
Photon flux (15-150 keV) in 400 sec: 0.146186 ( -0.010702 0.010727 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1849e-06 ( -3.12668e-07 3.31752e-07 ) ergs/cm2
Band function
Time interval is from -28.824 sec. to 371.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.68059 ( 1.68059 1.68059 )
beta : -2.79073 ( 2.79029 0.621614 )
Epeak [keV] : 22.7799 ( -22.7799 10.5111 )
Norm@50keV : 1.88792E-03 ( -0.000551473 299.015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.10 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 4.334313e-01
Photon flux (15-150 keV) in 400 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.92601 (-0.690427 0.744415)
R^2/D10^2 : 0.101574 (-0.0279693 0.0389577)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.41 using 59 PHA bins.
# Reduced chi-squared = 1.709 for 57 degrees of freedom
# Null hypothesis probability = 6.866392e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.275e-07 6.940e-08
25- 50 1.317e-06 1.144e-07
50-150 4.897e-07 1.011e-07
15-150 2.434e-06 2.034e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.8496 (-7.95601 10.7968)
Norm : 0.864761 (-0.105291 0.127188)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.40 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.604235e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.324e-07 8.300e-08
25- 50 1.167e-06 7.980e-08
50-150 1.064e-06 2.054e-07
15-150 3.064e-06 2.464e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.41951 (-0.971263 1.18311)
R1^2/D10^2 : 1.16069 (-0.70203 1.62837)
kT2 [keV] : 14.0098 (-2.30405 3.84245)
R2^2/D10^2 : 1.27484E-02 (-0.00838177 0.0102257)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.96 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.019150e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.822e-07 3.293e-07
25- 50 1.106e-06 3.428e-07
50-150 1.024e-06 3.725e-07
15-150 3.012e-06 8.676e-07
Peak spectrum fit
Power-law model
Time interval is from 90.676 sec. to 91.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28331 ( -0.459267 0.558628 )
Norm@50keV : 4.28281E-03 ( -0.00162027 0.00156415 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.74 using 59 PHA bins.
# Reduced chi-squared = 0.9604 for 57 degrees of freedom
# Null hypothesis probability = 5.603325e-01
Photon flux (15-150 keV) in 1 sec: 0.741571 ( -0.169862 0.170011 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0804e-08 ( -1.20935e-08 1.30468e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 90.676 sec. to 91.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93116 ( )
Epeak [keV] : 7.09104 ( )
Norm@50keV : 7.16170E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.78 using 59 PHA bins.
# Reduced chi-squared = 0.9781 for 56 degrees of freedom
# Null hypothesis probability = 5.212670e-01
Photon flux (15-150 keV) in 1 sec: 0.740286 ( -0.178164 0.17013 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.05509e-08 ( -1.459e-08 1.3121e-08 ) ergs/cm2
Band function
Time interval is from 90.676 sec. to 91.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62195 ( 1.62982 1.62982 )
beta : -2.47546 ( 2.45728 0.626979 )
Epeak [keV] : 17.8201 ( -17.1158 62.6785 )
Norm@50keV : 1.20455E-02 ( -0.0108742 4914.89 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.67 using 59 PHA bins.
# Reduced chi-squared = 0.9939 for 55 degrees of freedom
# Null hypothesis probability = 4.873742e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.63595 (-1.98478 2.50083)
R^2/D10^2 : 0.980962 (-0.662676 2.32387)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.33 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.260652e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.969e-09 4.796e-09
25- 50 1.607e-08 8.421e-09
50-150 3.611e-09 2.707e-09
15-150 2.965e-08 1.329e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 39.0367 (-18.0217 46.6955)
Norm : 4.88142 (-1.79275 3.36973)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.01 using 59 PHA bins.
# Reduced chi-squared = 0.9650 for 57 degrees of freedom
# Null hypothesis probability = 5.502044e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.112e-08 4.183e-09
25- 50 1.447e-08 6.448e-09
50-150 1.090e-08 7.894e-09
15-150 3.648e-08 1.531e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.88004 (-3.3651 -3.88004)
R1^2/D10^2 : 10.3126 (-9.40072 -10.3126)
kT2 [keV] : 12.2178 (-11.6993 -12.2178)
R2^2/D10^2 : 0.108843 (-0.107616 1.07868)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.98 using 59 PHA bins.
# Reduced chi-squared = 0.9996 for 55 degrees of freedom
# Null hypothesis probability = 4.755235e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.152e-08 6.165e-09
25- 50 1.373e-08 7.175e-09
50-150 1.007e-08 6.990e-09
15-150 3.532e-08 1.849e-08
Plot creation:
Tue Dec 12 23:46:09 EST 2017