batgrbproduct analysis for trigger=886486
batgrbproduct Analysis for Trigger=886486
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): Wed Jan 30 06:53:33 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger886486/GCN5_download_cron
======================================================================
Trigger: 00886486 Segment: 000
BAT Trigger Time: 570446432 [s; MET]
Trigger Stop: 570446496 [s; MET]
UTC: 2019-01-29T09:20:09.671280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 247.717608605809 Dec: -47.8066102532691 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.3
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.3
Flight Position: [ source = BAT ]
RA: 247.717608605809 Dec: -47.8066102532691 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 247.729930368057 Dec: -47.8499847397394 [deg; J2000]
{ 16h 30m 55.2s , -47d 50' 59.9" }
+/- 3.15438515046415 [arcmin] (estimated 90% radius based on SNR)
+/- 2.13185176970942 [arcmin] (formal 1-sigma fit error)
SNR: 5.89363269739558
Angular difference between Flight and Ground position is 2.649376 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.514358 0.300035 0.113761 -0.002503
0.070675 0.070492 0.062156 0.062850 [error]
Peak 0.514358 0.300035 0.113761 -0.002503
0.070675 0.070492 0.062156 0.062850 [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 1.60e-07 1.33e-07 7.50e-08 6.27e-08 3.95e-07 4.30e-07 erg/cm2
Error 3.48e-08 3.85e-08 4.64e-08 8.33e-08 1.12e-07 1.54e-07 erg/cm2
Peak flux Power-law 8.28e-02 3.86e-02 1.09e-02 3.85e-03 1.35e-01 1.36e-01 ph/cm2/s
Error 1.85e-02 1.06e-02 6.52e-03 4.83e-03 2.65e-02 2.73e-02 ph/cm2/s
Fluence Cutoff-PL 1.60e-07 1.32e-07 7.36e-08 6.01e-08 3.93e-07 4.26e-07 erg/cm2
Error 3.46e-08 3.86e-08 5.73e-08 8.25e-08 1.17e-07 1.36e-07 erg/cm2
Peak flux Cutoff-PL 8.27e-02 3.86e-02 1.09e-02 3.85e-03 1.35e-01 1.36e-01 ph/cm2/s
Error 1.83e-02 1.07e-02 8.03e-03 4.01e-03 2.63e-02 2.69e-02 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 2.825 0.563 - - 5.54e-04 2.54e-04 51.500 57
CPL 1.967 0.000 1.1 0.0 2.23e-03 0.00e+00 52.490 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.825 0.563 - - 5.54e-04 2.54e-04 51.500 57
CPL 1.967 0.000 1.1 0.0 2.23e-03 0.00e+00 52.490 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
247.7299 -47.8500 0.0326 21.3 157.7 0.9470 5.9 TRIG_00886486
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.82450 ( -0.502384 0.623962 )
Norm@50keV : 5.54206E-04 ( -0.000243466 0.000264341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.50 using 59 PHA bins.
# Reduced chi-squared = 0.9035 for 57 degrees of freedom
# Null hypothesis probability = 6.808180e-01
Photon flux (15-150 keV) in 64 sec: 0.134566 ( -0.0264256 0.0264962 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.95277e-07 ( -1.04951e-07 1.18216e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96688 ( )
Epeak [keV] : 1.12104 ( )
Norm@50keV : 2.23134E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.49 using 59 PHA bins.
# Reduced chi-squared = 0.9374 for 56 degrees of freedom
# Null hypothesis probability = 6.084350e-01
Photon flux (15-150 keV) in 64 sec: 0.134538 ( -0.026413 0.026123 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92863e-07 ( -1.14397e-07 1.20496e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.69621 ( 1.60944 1.60944 )
beta : -2.94620 ( 2.89494 0.566055 )
Epeak [keV] : 16.0179 ( -6.5086 145.045 )
Norm@50keV : 32.2785 ( -32.2775 3204.38 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.32 using 59 PHA bins.
# Reduced chi-squared = 0.9330 for 55 degrees of freedom
# Null hypothesis probability = 6.161062e-01
Photon flux (15-150 keV) in 64 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] : 5.01849 (-1.08849 1.38828)
R^2/D10^2 : 1.06270 (-0.706342 2.34908)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.11 using 59 PHA bins.
# Reduced chi-squared = 0.9844 for 57 degrees of freedom
# Null hypothesis probability = 5.084966e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.679e-07 8.167e-08
25- 50 1.106e-07 5.350e-08
50-150 4.579e-09 3.745e-09
15-150 2.831e-07 1.324e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.8820 (-7.5105 14.6206)
Norm : 1.71042 (-0.763402 1.64308)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.12 using 59 PHA bins.
# Reduced chi-squared = 0.9319 for 57 degrees of freedom
# Null hypothesis probability = 6.214148e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.614e-07 5.197e-08
25- 50 1.351e-07 5.731e-08
50-150 3.667e-08 2.906e-08
15-150 3.332e-07 1.201e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.47770 (-1.83406 1.44656)
R1^2/D10^2 : 1.70696 (-1.1909 15.6853)
kT2 [keV] : 39.6914 (-27.9043 -43.0128)
R2^2/D10^2 : 2.50374E-04 (-0.000184075 0.00803551)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.61 using 59 PHA bins.
# Reduced chi-squared = 0.9202 for 55 degrees of freedom
# Null hypothesis probability = 6.428414e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.705e-07 9.725e-08
25- 50 1.047e-07 5.791e-08
50-150 2.129e-07 1.268e-07
15-150 4.881e-07 2.443e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.82450 ( -0.502384 0.623962 )
Norm@50keV : 5.54206E-04 ( -0.000243466 0.000264341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.50 using 59 PHA bins.
# Reduced chi-squared = 0.9035 for 57 degrees of freedom
# Null hypothesis probability = 6.808180e-01
Photon flux (15-150 keV) in 64 sec: 0.134566 ( -0.0264256 0.0264962 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.95277e-07 ( -1.04951e-07 1.18216e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96688 ( )
Epeak [keV] : 1.12104 ( )
Norm@50keV : 2.23134E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.49 using 59 PHA bins.
# Reduced chi-squared = 0.9374 for 56 degrees of freedom
# Null hypothesis probability = 6.084350e-01
Photon flux (15-150 keV) in 64 sec: 0.134538 ( -0.026413 0.026123 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92863e-07 ( -1.13364e-07 1.16268e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.69621 ( 1.60944 1.60944 )
beta : -2.94620 ( 2.89494 0.566055 )
Epeak [keV] : 16.0179 ( -6.5086 145.045 )
Norm@50keV : 32.2785 ( -32.2775 3204.38 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.32 using 59 PHA bins.
# Reduced chi-squared = 0.9330 for 55 degrees of freedom
# Null hypothesis probability = 6.161062e-01
Photon flux (15-150 keV) in 64 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] : 5.01849 (-1.08849 1.38828)
R^2/D10^2 : 1.06270 (-0.706342 2.34908)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.11 using 59 PHA bins.
# Reduced chi-squared = 0.9844 for 57 degrees of freedom
# Null hypothesis probability = 5.084966e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.679e-07 8.373e-08
25- 50 1.106e-07 6.071e-08
50-150 4.579e-09 3.992e-09
15-150 2.831e-07 1.232e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.8820 (-7.5105 14.6206)
Norm : 1.71042 (-0.763402 1.64308)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.12 using 59 PHA bins.
# Reduced chi-squared = 0.9319 for 57 degrees of freedom
# Null hypothesis probability = 6.214148e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.614e-07 5.226e-08
25- 50 1.351e-07 5.252e-08
50-150 3.667e-08 2.916e-08
15-150 3.332e-07 1.107e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.47770 (-1.83406 1.44656)
R1^2/D10^2 : 1.70696 (-1.1909 15.6853)
kT2 [keV] : 39.6914 (-27.9043 -43.0128)
R2^2/D10^2 : 2.50374E-04 (-0.000184075 0.00747614)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.61 using 59 PHA bins.
# Reduced chi-squared = 0.9202 for 55 degrees of freedom
# Null hypothesis probability = 6.428414e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.705e-07 9.640e-08
25- 50 1.047e-07 5.487e-08
50-150 2.129e-07 1.368e-07
15-150 4.881e-07 2.413e-07
Plot creation:
Wed Jan 30 07:00:01 EST 2019