batgrbproduct analysis for trigger=866757
batgrbproduct Analysis for Trigger=866757
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): Sat Oct 13 19:47:52 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger866757/GCN5_download_cron
======================================================================
Trigger: 00866757 Segment: 000
BAT Trigger Time: 561064010.304 [s; MET]
Trigger Stop: 561064011.328 [s; MET]
UTC: 2018-10-12T19:06:28.561000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.742839674306 Dec: -12.4731537437648 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.53
Image Trigger?: NO
Rate S/N Ratio: 24.5356882927706 [ if not an image trigger ]
Image S/N Ratio: 6.53
Flight Position: [ source = BAT ]
RA: 264.742839674306 Dec: -12.4731537437648 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.771405842648 Dec: -12.3858411272199 [deg; J2000]
{ 17h 39m 05.1s , -12d 23' 09.0" }
+/- 5.06885844080379 [arcmin] (estimated 90% radius based on SNR)
+/- 3.05236269129175 [arcmin] (formal 1-sigma fit error)
SNR: 2.99298032398198
Angular difference between Flight and Ground position is 5.499652 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 1.0239999294281 +/-
Measured from: 0
to: 1.0239999294281 [s; relative to TRIGTIME]
T50: 1.0239999294281 +/-
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 -0.000618 0.003235 0.051365 0.049965
0.012548 0.014596 0.013189 0.016225 [error]
Peak -0.000618 0.003235 0.051365 0.049965
0.012548 0.014596 0.013189 0.016225 [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 1.15e-09 6.30e-09 2.98e-08 5.90e-07 9.33e-08 6.28e-07 erg/cm2
Error 1.85e-09 6.40e-09 2.12e-08 9.10e-07 3.53e-08 7.94e-07 erg/cm2
Peak flux Power-law 3.49e-02 1.01e-01 2.40e-01 1.56e+00 6.49e-01 1.93e+00 ph/cm2/s
Error 5.71e-02 1.06e-01 1.62e-01 1.81e+00 4.22e-01 1.69e+00 ph/cm2/s
Fluence Cutoff-PL 4.55e-10 5.75e-09 3.66e-08 1.40e-07 9.19e-08 3.10e-07 erg/cm2
Error 1.64e-09 5.23e-09 2.80e-08 5.15e-07 3.97e-08 -------- erg/cm2
Peak flux Cutoff-PL 9.40e-03 7.49e-02 2.93e-01 4.52e-01 6.26e-01 8.31e-01 ph/cm2/s
Error 5.03e-02 1.00e-01 2.26e-01 1.31e+00 2.67e-01 1.06e+00 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 -0.244 1.445 - - 4.36e-03 3.74e-03 53.000 57
CPL -1.727 0.757 201.4 0.0 1.11e-02 6.21e+00 52.460 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.244 1.445 - - 4.36e-03 3.74e-03 53.000 57
CPL -1.727 0.757 201.4 0.0 1.11e-02 6.21e+00 52.460 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
264.7714 -12.3858 0.0642 29.0 4.7 0.0890 3.0 TRIG_00866757
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.203 -47.679 (delta_t = 12.524 [sec])
-46.304 -10.304 (delta_t = 36.000 [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: -0.243746 ( -2.06491 0.825297 )
Norm@50keV : 4.36449E-03 ( -0.00436524 0.00311303 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.00 using 59 PHA bins.
# Reduced chi-squared = 0.9299 for 57 degrees of freedom
# Null hypothesis probability = 6.256925e-01
Photon flux (15-150 keV) in 1.024 sec: 0.648780 ( -0.55687 0.286892 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.33072e-08 ( -3.53023e-08 3.53097e-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: -1.72710 ( 1.7714 3.28507 )
Epeak [keV] : 201.404 ( -194.306 -194.306 )
Norm@50keV : 1.11269E-02 ( -0.0121068 12.4166 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9367 for 56 degrees of freedom
# Null hypothesis probability = 6.097594e-01
Photon flux (15-150 keV) in 1.024 sec: 0.625550 ( -0.254 0.280777 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.19289e-08 ( -4.21017e-08 3.73951e-08 ) 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 : 4.38548 ( -0.265473 -0.265473 )
beta : -0.479283 ( 0.479415 1.68473 )
Epeak [keV] : 102.625 ( -102.618 191.849 )
Norm@50keV : 0.115360 ( -0.111675 0.0845732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.92 using 59 PHA bins.
# Reduced chi-squared = 0.9440 for 55 degrees of freedom
# Null hypothesis probability = 5.931115e-01
Photon flux (15-150 keV) in 1.024 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] : 58.6956 (-58.6956 -58.6956)
R^2/D10^2 : 2.43565E-03 (-0.00243545 0.0119664)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.60 using 59 PHA bins.
# Reduced chi-squared = 0.9229 for 57 degrees of freedom
# Null hypothesis probability = 6.405082e-01
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] : 199.358 (-111.264 -199.361)
Norm : 2.06011 (-1.33208 1.3321)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.42 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.075521e-01
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
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.216994 (-0.216994 -0.216994)
R1^2/D10^2 : 1.91409 (-1.91409 -1.91409)
kT2 [keV] : 58.6898 (-30.6075 -58.6898)
R2^2/D10^2 : 2.43594E-03 (-0.00221165 0.0119662)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.60 using 59 PHA bins.
# Reduced chi-squared = 0.9565 for 55 degrees of freedom
# Null hypothesis probability = 5.666730e-01
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: -0.243746 ( -2.06491 0.825297 )
Norm@50keV : 4.36449E-03 ( -0.00436524 0.00311303 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.00 using 59 PHA bins.
# Reduced chi-squared = 0.9299 for 57 degrees of freedom
# Null hypothesis probability = 6.256925e-01
Photon flux (15-150 keV) in 1.024 sec: 0.648780 ( -0.55687 0.286892 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.33072e-08 ( -3.53023e-08 3.53097e-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: -1.72710 ( 1.7714 3.28507 )
Epeak [keV] : 201.404 ( -194.306 -194.306 )
Norm@50keV : 1.11269E-02 ( -0.0121068 12.4166 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9367 for 56 degrees of freedom
# Null hypothesis probability = 6.097594e-01
Photon flux (15-150 keV) in 1.024 sec: 0.625550 ( -0.254 0.280777 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.19289e-08 ( -4.21017e-08 3.73951e-08 ) 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 : 4.38548 ( -0.265473 -0.265473 )
beta : -0.479283 ( 0.479415 1.68074 )
Epeak [keV] : 102.625 ( -102.618 177.504 )
Norm@50keV : 0.115360 ( -0.111675 0.0845732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.92 using 59 PHA bins.
# Reduced chi-squared = 0.9440 for 55 degrees of freedom
# Null hypothesis probability = 5.931115e-01
Photon flux (15-150 keV) in 1.024 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] : 58.6956 (-58.6956 -58.6956)
R^2/D10^2 : 2.43565E-03 (-0.00243545 0.0119664)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.60 using 59 PHA bins.
# Reduced chi-squared = 0.9229 for 57 degrees of freedom
# Null hypothesis probability = 6.405082e-01
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] : 199.358 (-111.264 -199.361)
Norm : 2.06011 (-1.33208 1.3321)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.42 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.075521e-01
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
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.216994 (-0.216994 -0.216994)
R1^2/D10^2 : 1.91409 (-1.91409 -1.91409)
kT2 [keV] : 58.6898 (-30.6075 -58.6898)
R2^2/D10^2 : 2.43594E-03 (-0.00221165 0.0119662)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.60 using 59 PHA bins.
# Reduced chi-squared = 0.9565 for 55 degrees of freedom
# Null hypothesis probability = 5.666730e-01
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:
Sat Oct 13 19:51:29 EDT 2018