batgrbproduct analysis for trigger=886157
batgrbproduct Analysis for Trigger=886157
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): Mon Jan 28 22:17:03 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger886157/GCN5_download_cron
======================================================================
Trigger: 00886157 Segment: 000
BAT Trigger Time: 570331368 [s; MET]
Trigger Stop: 570331688 [s; MET]
UTC: 2019-01-28T01:22:25.678520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 262.232204192715 Dec: -36.2373715963624 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.57
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.57
Flight Position: [ source = BAT ]
RA: 262.232204192715 Dec: -36.2373715963624 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 262.252040366312 Dec: -36.2318360585215 [deg; J2000]
{ 17h 29m 00.5s , -36d 13' 54.6" }
+/- 2.92607601900498 [arcmin] (estimated 90% radius based on SNR)
+/- 1.47469995041624 [arcmin] (formal 1-sigma fit error)
SNR: 6.56139354992167
Angular difference between Flight and Ground position is 1.015826 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.463398 0.930310 0.668376 0.045199
0.146172 0.129551 0.107660 0.090063 [error]
Peak 0.463398 0.930310 0.668376 0.045199
0.146172 0.129551 0.107660 0.090063 [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 1.76e-07 3.36e-07 4.95e-07 1.56e-06 1.40e-06 2.57e-06 erg/cm2
Error 5.04e-08 5.96e-08 1.02e-07 6.95e-07 2.53e-07 7.70e-07 erg/cm2
Peak flux Power-law 1.78e-02 1.85e-02 1.36e-02 1.61e-02 5.61e-02 6.60e-02 ph/cm2/s
Error 5.16e-03 3.36e-03 2.72e-03 6.63e-03 9.54e-03 1.10e-02 ph/cm2/s
Fluence Cutoff-PL 1.35e-07 3.80e-07 5.25e-07 3.08e-07 1.25e-06 1.35e-06 erg/cm2
Error 6.01e-08 7.68e-08 1.24e-07 6.17e-07 2.80e-07 6.44e-07 erg/cm2
Peak flux Cutoff-PL 1.34e-02 2.06e-02 1.48e-02 4.48e-03 5.22e-02 5.32e-02 ph/cm2/s
Error 6.15e-03 4.19e-03 3.30e-03 6.88e-03 1.01e-02 1.18e-02 ph/cm2/s
Fluence Band 1.28e-07 3.89e-07 5.01e-07 6.54e-07 1.27e-06 1.69e-06 erg/cm2
Error 9.65e-08 9.48e-08 -------- 8.57e-07 -------- -------- erg/cm2
Peak flux Band 1.53e-02 2.02e-02 1.45e-02 6.17e-03 5.40e-02 5.60e-02 ph/cm2/s
Error -------- -------- -------- -------- -------- 1.22e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.442 0.279 - - 4.56e-04 7.58e-05 73.280 57
CPL -0.017 1.593 68.8 73.5 2.43e-03 1.05e-02 69.450 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.442 0.279 - - 4.56e-04 7.58e-05 73.280 57
CPL -0.017 1.593 68.8 73.5 2.43e-03 1.05e-02 69.450 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
262.2520 -36.2318 0.0294 17.3 -23.8 2.6063 6.6 TRIG_00886157
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [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 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44221 ( -0.279396 0.279108 )
Norm@50keV : 4.56100E-04 ( -7.58715e-05 7.56643e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.28 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 57 degrees of freedom
# Null hypothesis probability = 7.199240e-02
Photon flux (15-150 keV) in 320 sec: 5.61000E-02 ( -0.00952036 0.00956949 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39887e-06 ( -2.50615e-07 2.54702e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.71966E-02 ( -1.89221 1.29466 )
Epeak [keV] : 68.7701 ( -17.0198 130.072 )
Norm@50keV : 2.43370E-03 ( -0.00243371 0.0185265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.45 using 59 PHA bins.
# Reduced chi-squared = 1.240 for 56 degrees of freedom
# Null hypothesis probability = 1.068174e-01
Photon flux (15-150 keV) in 320 sec: 5.21966E-02 ( -0.0100755 0.0101585 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25114e-06 ( -2.72595e-07 2.868e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.44100 ( -4.73052 -3.37327 )
beta : -1.98116 ( 2.00694 0.583413 )
Epeak [keV] : 43.9551 ( -15.097 148.111 )
Norm@50keV : 8.07258E-02 ( -0.080649 1.41773 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 55 degrees of freedom
# Null hypothesis probability = 9.286863e-02
Photon flux (15-150 keV) in 320 sec: 5.39944E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26547e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.1417 (-2.56372 3.28254)
R^2/D10^2 : 6.39176E-03 (-0.00320736 0.00599124)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.38 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 57 degrees of freedom
# Null hypothesis probability = 9.524657e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.803e-08 3.131e-08
25- 50 3.929e-07 1.106e-07
50-150 6.156e-07 2.142e-07
15-150 1.106e-06 2.443e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-92.0544 -199.363)
Norm : 0.232779 (-0.0380376 0.038098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.17 using 59 PHA bins.
# Reduced chi-squared = 1.266 for 57 degrees of freedom
# Null hypothesis probability = 8.488888e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.855e-07 1.082e-07
25- 50 3.568e-07 2.019e-07
50-150 7.825e-07 4.395e-07
15-150 1.325e-06 7.539e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.86631 (-9.92497 -9.92497)
R1^2/D10^2 : 1.64495E-02 (-0.0161804 -0.0161804)
kT2 [keV] : 24.5741 (-25.6047 -25.6047)
R2^2/D10^2 : 7.29410E-04 (-0.000614192 0.00781475)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.14 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 55 degrees of freedom
# Null hypothesis probability = 9.512070e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.286e-07 8.512e-08
25- 50 3.923e-07 2.509e-07
50-150 7.507e-07 4.438e-07
15-150 1.272e-06 7.190e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44221 ( -0.279396 0.279108 )
Norm@50keV : 4.56100E-04 ( -7.58715e-05 7.56643e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.28 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 57 degrees of freedom
# Null hypothesis probability = 7.199240e-02
Photon flux (15-150 keV) in 320 sec: 5.61000E-02 ( -0.00952036 0.00956949 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39887e-06 ( -2.50615e-07 2.54702e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.71966E-02 ( -1.89221 1.29466 )
Epeak [keV] : 68.7701 ( -17.0198 130.072 )
Norm@50keV : 2.43370E-03 ( -0.00243371 0.0185265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.45 using 59 PHA bins.
# Reduced chi-squared = 1.240 for 56 degrees of freedom
# Null hypothesis probability = 1.068174e-01
Photon flux (15-150 keV) in 320 sec: 5.21966E-02 ( -0.0100755 0.0101585 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25114e-06 ( -2.72595e-07 2.868e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.44100 ( -4.73052 -3.37327 )
beta : -1.98116 ( 2.00694 0.583413 )
Epeak [keV] : 43.9551 ( -15.097 162.351 )
Norm@50keV : 8.07258E-02 ( -0.080649 1.41797 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 55 degrees of freedom
# Null hypothesis probability = 9.286863e-02
Photon flux (15-150 keV) in 320 sec: 5.39944E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26547e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.1417 (-2.56372 3.28254)
R^2/D10^2 : 6.39176E-03 (-0.00320736 0.00599124)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.38 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 57 degrees of freedom
# Null hypothesis probability = 9.524657e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.803e-08 3.133e-08
25- 50 3.929e-07 1.074e-07
50-150 6.156e-07 1.941e-07
15-150 1.106e-06 2.590e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-92.0544 -199.363)
Norm : 0.232779 (-0.0380376 0.038098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.17 using 59 PHA bins.
# Reduced chi-squared = 1.266 for 57 degrees of freedom
# Null hypothesis probability = 8.488888e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.855e-07 1.073e-07
25- 50 3.568e-07 2.018e-07
50-150 7.825e-07 4.427e-07
15-150 1.325e-06 7.459e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.86631 (-9.92497 -9.92497)
R1^2/D10^2 : 1.64495E-02 (-0.0161804 -0.0161804)
kT2 [keV] : 24.5741 (-25.6047 -25.6047)
R2^2/D10^2 : 7.29410E-04 (-0.000614192 0.00781475)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.14 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 55 degrees of freedom
# Null hypothesis probability = 9.512070e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.286e-07 7.795e-08
25- 50 3.923e-07 2.507e-07
50-150 7.507e-07 4.125e-07
15-150 1.272e-06 7.094e-07
Plot creation:
Mon Jan 28 22:23:52 EST 2019