batgrbproduct analysis for trigger=946234
batgrbproduct Analysis for Trigger=946234
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): Fri Dec 27 19:55:00 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger946234/GCN5_download_cron
======================================================================
Trigger: 00946234 Segment: 000
BAT Trigger Time: 599013089.536 [s; MET]
Trigger Stop: 599013090.56 [s; MET]
UTC: 2019-12-26T00:31:05.384640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 17.1412637529961 Dec: -57.0848078296346 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.55
Image Trigger?: NO
Rate S/N Ratio: 14.456832294801 [ if not an image trigger ]
Image S/N Ratio: 6.55
Flight Position: [ source = BAT ]
RA: 17.1412637529961 Dec: -57.0848078296346 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 17.431008785407 Dec: -56.9534997200408 [deg; J2000]
{ 01h 09m 43.4s , -56d 57' 12.6" }
+/- 9.82628389554658 [arcmin] (estimated 90% radius based on SNR)
+/- 8.11179934360635 [arcmin] (formal 1-sigma fit error)
SNR: 1.16257068960071
Angular difference between Flight and Ground position is 12.313739 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 1.0239999294281 +/- 35.7770876399966
Measured from: 0
to: 1.0239999294281 [s; relative to TRIGTIME]
T50: 1.0239999294281 +/- 16
Measured from: 0
to: 1.0239999294281 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.0239999294281 second)
Measured from: 0
to: 1.0239999294281 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.0239999294281 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.031050 -0.054431 0.015958 0.050169
0.014639 0.018712 0.016508 0.021999 [error]
Peak -0.031050 -0.054431 0.015958 0.050169
0.014639 0.018712 0.016508 0.021999 [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 0.00e+00 0.00e+00 0.00e+001.11e-081.04e-08 0.00e+007.52e-07 0.00e+004.41e-08 0.00e+007.09e-07 erg/cm2
Error 7.35e-10 2.88e-09 1.14e-08 7.76e-07 4.43e-08 7.85e-07 erg/cm2
Peak flux Power-law 0.00e+00 0.00e+00 0.00e+008.19e-028.19e-02 0.00e+001.60e+00 0.00e+002.62e-01 0.00e+001.75e+00 ph/cm2/s
Error 3.27e-02 4.68e-02 8.95e-02 1.83e+00 2.63e-01 1.91e+00 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 1.30e-09 4.14e-09 9.52e-09 1.28e-05 5.08e-08 1.28e-05 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 3.26e-02 6.27e-02 7.32e-02 -------- 2.53e-01 2.53e+01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 1.500 0.000 - - 0.00e+00 1.90e-03 71.320 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 71.320 56
The chi2 of BB fit is which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 0.000 - - 0.00e+00 1.90e-03 71.320 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 71.320 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
17.4310 -56.9535 0.1658 11.3 118.0 0.0539 1.2 TRIG_00946234
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.536 -12.656 (delta_t = 47.880 [sec])
-11.536 -9.536 (delta_t = 2.000 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.00380912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.601581e-02
Photon flux (15-150 keV) in 1.024 sec: 0.0 0.261839 ( -0.254348 0.271827 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( -4.33249e-08 4.5299e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 56 degrees of freedom
# Null hypothesis probability = 8.143888e-02
Photon flux (15-150 keV) in 1.024 sec: 0.0 0.172113 0.177658 0.152672 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.932596 ( 0.98395 0.98395 )
beta : 1.32120 ( 2.5 2.5 )
Epeak [keV] : 5.58228 ( -80 -80 )
Norm@50keV : 1.21690E-02 ( -0.0121625 771.143 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.59 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 55 degrees of freedom
# Null hypothesis probability = 1.029382e-01
Photon flux (15-150 keV) in 1.024 sec: 0.0 ( ) 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] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.601581e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.601581e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.358 (-199.36 -199.36)
R1^2/D10^2 : 1.46136E-04 (-0.000146022 -0.000146022)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
#Fit statistic : Chi-Squared = 69.19 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 55 degrees of freedom
# Reduced chi-squared = 1.258 for 55 degrees of freedom
# Null hypothesis probability = 6.852552e-02
# Null hypothesis probability = 9.446635e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.00380912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.601581e-02
Photon flux (15-150 keV) in 1.024 sec: 0.0 0.261839 ( -0.254348 0.271827 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( -4.33249e-08 4.5299e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 56 degrees of freedom
# Null hypothesis probability = 8.143888e-02
Photon flux (15-150 keV) in 1.024 sec: 0.0 0.172113 0.177658 0.152672 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.932596 ( 0.98395 0.98395 )
beta : 1.32120 ( 2.5 2.5 )
Epeak [keV] : 5.58228 ( -80 -80 )
Norm@50keV : 1.21690E-02 ( -0.0121625 771.143 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.59 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 55 degrees of freedom
# Null hypothesis probability = 1.029382e-01
Photon flux (15-150 keV) in 1.024 sec: 0.0 ( ) 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] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.601581e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.601581e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.358 (-199.36 -199.36)
R1^2/D10^2 : 1.46136E-04 (-0.000146022 -0.000146022)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
#Fit statistic : Chi-Squared = 69.19 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 55 degrees of freedom
# Reduced chi-squared = 1.258 for 55 degrees of freedom
# Null hypothesis probability = 6.852552e-02
# Null hypothesis probability = 9.446635e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Fri Dec 27 19:57:18 EST 2019