batgrbproduct Analysis for Trigger=677981
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sun Mar 6 19:27:38 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger677981/GCN5_download_cron
======================================================================
Trigger: 00677981 Segment: 000
BAT Trigger Time: 478950112 [s; MET]
Trigger Stop: 478950744 [s; MET]
UTC: 2016-03-06T09:41:36.060380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 257.250230239272 Dec: -36.4483358823612 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.02
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.02
Flight Position: [ source = BAT ]
RA: 257.250230239272 Dec: -36.4483358823612 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 257.303651915513 Dec: -36.3916615805046 [deg; J2000]
{ 17h 09m 12.9s , -36d 23' 30.0" }
+/- 4.01198738887746 [arcmin] (estimated 90% radius based on SNR)
+/- 2.28922578374313 [arcmin] (formal 1-sigma fit error)
SNR: 4.17999875622385
Angular difference between Flight and Ground position is 4.267986 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 632 +/-
Measured from: 0
to: 632 [s; relative to TRIGTIME]
T50: 632 +/-
Measured from: 0
to: 632 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 632 second)
Measured from: 0
to: 632 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 632 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.640780 0.920079 0.433199 0.116628
0.151543 0.135875 0.111368 0.093136 [error]
Peak 0.640780 0.920079 0.433199 0.116628
0.151543 0.135875 0.111368 0.093136 [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 2.09e-07 3.26e-07 3.81e-07 8.60e-07 1.17e-06 1.78e-06 erg/cm2
Error 5.75e-08 5.91e-08 1.04e-07 4.84e-07 2.45e-07 5.83e-07 erg/cm2
Peak flux Power-law 1.08e-02 9.21e-03 5.38e-03 4.71e-03 2.74e-02 3.01e-02 ph/cm2/s
Error 3.01e-03 1.69e-03 1.42e-03 2.45e-03 5.01e-03 5.49e-03 ph/cm2/s
Fluence Cutoff-PL 1.97e-07 3.52e-07 3.74e-07 3.00e-07 1.09e-06 1.22e-06 erg/cm2
Error 6.36e-08 8.16e-08 9.40e-08 6.69e-07 2.88e-07 7.48e-07 erg/cm2
Peak flux Cutoff-PL 1.01e-02 9.90e-03 5.37e-03 2.04e-03 2.67e-02 2.74e-02 ph/cm2/s
Error 3.37e-03 2.27e-03 1.65e-03 3.55e-03 5.22e-03 6.55e-03 ph/cm2/s
Fluence Band 1.87e-07 3.67e-07 3.53e-07 5.66e-07 1.11e-06 1.49e-06 erg/cm2
Error -------- -------- -------- -------- 2.64e-07 -------- 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 1.774 0.324 - - 2.01e-04 4.09e-05 53.780 57
CPL 1.142 1.492 58.2 -1.8 4.58e-04 2.98e-03 53.120 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.774 0.324 - - 2.01e-04 4.09e-05 53.780 57
CPL 1.142 1.493 58.2 -1.8 4.58e-04 2.98e-03 53.120 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 632.000 0.000 632.000
T90 632.000 0.000 632.000
T50 632.000 0.000 632.000
Peak 632.000 0.000 632.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
257.3037 -36.3917 0.0462 0.0 -72.2 2.1050 4.2 TRIG_00677981
------------------------------------------
Foreground time interval of the image:
0.000 166.210 (delta_t = 166.210 [sec])
167.000 632.000 (delta_t = 465.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 166.210000
167.000000 632.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77386 ( -0.317018 0.330482 )
Norm@50keV : 2.00731E-04 ( -4.13671e-05 4.03371e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9436 for 57 degrees of freedom
# Null hypothesis probability = 5.965498e-01
Photon flux (15-150 keV) in 631.2 sec: 2.73851E-02 ( -0.00500771 0.00501502 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16766e-06 ( -2.41678e-07 2.48531e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 166.210000
167.000000 632.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14203 ( -1.91908 1.0645 )
Epeak [keV] : 58.2442 ( -54.6586 -58.2576 )
Norm@50keV : 4.58370E-04 ( -0.000293098 0.00566516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.12 using 59 PHA bins.
# Reduced chi-squared = 0.9486 for 56 degrees of freedom
# Null hypothesis probability = 5.845495e-01
Photon flux (15-150 keV) in 631.2 sec: 2.66929E-02 ( -0.0052285 0.0052138 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08902e-06 ( -2.8125e-07 2.94821e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 166.210000
167.000000 632.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.09923 ( 0.105805 0.105805 )
beta : -2.11763 ( 2.10739 0.554655 )
Epeak [keV] : 33.9779 ( -37.3513 61.1211 )
Norm@50keV : 1.60310E-02 ( -0.0152943 9.011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 59 PHA bins.
# Reduced chi-squared = 0.9497 for 55 degrees of freedom
# Null hypothesis probability = 5.810332e-01
Photon flux (15-150 keV) in 631.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10858e-06 ( -1.10416e-06 -2.63387e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8357 (-2.05629 2.74515)
R^2/D10^2 : 9.63408E-03 (-0.00553473 0.0117915)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.505254e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.487e-07 5.397e-08
25- 50 4.124e-07 1.282e-07
50-150 2.703e-07 1.229e-07
15-150 8.314e-07 2.454e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.8096 (-45.9679 -98.8096)
Norm : 0.121811 (-0.0265341 0.0394904)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.12 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 57 degrees of freedom
# Null hypothesis probability = 6.212753e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.010e-07 5.346e-08
25- 50 3.466e-07 8.950e-08
50-150 5.579e-07 3.906e-07
15-150 1.105e-06 4.586e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.60737 (-3.48489 3.2606)
R1^2/D10^2 : 2.74781E-02 (-0.0158822 0.0606462)
kT2 [keV] : 27.4373 (-21.6829 -33.2703)
R2^2/D10^2 : 1.82389E-04 (-9.88634e-05 0.00311435)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.16 using 59 PHA bins.
# Reduced chi-squared = 0.9483 for 55 degrees of freedom
# Null hypothesis probability = 5.838835e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.887e-07 1.126e-07
25- 50 3.640e-07 2.030e-07
50-150 5.267e-07 3.393e-07
15-150 1.079e-06 5.678e-07
Peak spectrum fit
Power-law model
Time interval is from 167.000 sec. to 632.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77386 ( -0.317018 0.330482 )
Norm@50keV : 2.00731E-04 ( -4.13671e-05 4.03371e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9436 for 57 degrees of freedom
# Null hypothesis probability = 5.965498e-01
Photon flux (15-150 keV) in 631.2 sec: 2.73851E-02 ( -0.00500771 0.00501502 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16766e-06 ( -2.41678e-07 2.48531e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 167.000 sec. to 632.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14203 ( -1.91908 1.06618 )
Epeak [keV] : 58.2442 ( -54.6586 -58.2576 )
Norm@50keV : 4.58370E-04 ( -0.000293098 0.00566516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.12 using 59 PHA bins.
# Reduced chi-squared = 0.9486 for 56 degrees of freedom
# Null hypothesis probability = 5.845495e-01
Photon flux (15-150 keV) in 631.2 sec: 2.66929E-02 ( -0.0052285 0.0052138 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08902e-06 ( -2.8125e-07 2.94821e-07 ) ergs/cm2
Band function
Time interval is from 167.000 sec. to 632.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.09923 ( 0.105805 0.105805 )
beta : -2.11763 ( 2.10739 0.554655 )
Epeak [keV] : 33.9779 ( -37.3513 61.1211 )
Norm@50keV : 1.60310E-02 ( -0.0152943 9.01079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 59 PHA bins.
# Reduced chi-squared = 0.9497 for 55 degrees of freedom
# Null hypothesis probability = 5.810332e-01
Photon flux (15-150 keV) in 631.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10858e-06 ( -1.10416e-06 -2.63387e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8357 (-2.05629 2.74515)
R^2/D10^2 : 9.63408E-03 (-0.00553473 0.0117915)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.505254e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.487e-07 5.226e-08
25- 50 4.124e-07 1.218e-07
50-150 2.703e-07 1.192e-07
15-150 8.314e-07 2.685e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.8096 (-45.9679 -98.8096)
Norm : 0.121811 (-0.0265341 0.0394904)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.12 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 57 degrees of freedom
# Null hypothesis probability = 6.212753e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.010e-07 5.378e-08
25- 50 3.466e-07 1.147e-07
50-150 5.579e-07 3.732e-07
15-150 1.105e-06 4.175e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.60737 (-3.48489 3.2606)
R1^2/D10^2 : 2.74781E-02 (-0.0158822 0.0606462)
kT2 [keV] : 27.4373 (-21.6829 -33.2703)
R2^2/D10^2 : 1.82389E-04 (-9.88634e-05 0.00311435)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.16 using 59 PHA bins.
# Reduced chi-squared = 0.9483 for 55 degrees of freedom
# Null hypothesis probability = 5.838835e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.887e-07 1.147e-07
25- 50 3.640e-07 2.045e-07
50-150 5.267e-07 3.232e-07
15-150 1.079e-06 5.772e-07
Plot creation:
Sun Mar 6 19:34:50 EST 2016