batgrbproduct Analysis for Trigger=677495
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): Thu Mar 3 22:10:56 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger677495
======================================================================
Trigger: 00677495 Segment: 000
BAT Trigger Time: 478695297.984 [s; MET]
Trigger Stop: 478695298.24 [s; MET]
UTC: 2016-03-03T10:54:42.058240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 168.681372288036 Dec: 22.7424795077935 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.2
Image Trigger?: NO
Rate S/N Ratio: 29.4108823397055 [ if not an image trigger ]
Image S/N Ratio: 8.2
Flight Position: [ source = BAT ]
RA: 168.681372288036 Dec: 22.7424795077935 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 168.709694980655 Dec: 22.7097469116251 [deg; J2000]
{ 11h 14m 50.3s , +22d 42' 35.1" }
+/- 2.14199522512374 [arcmin] (estimated 90% radius based on SNR)
+/- 0.996316122445668 [arcmin] (formal 1-sigma fit error)
SNR: 10.2452019893744
Angular difference between Flight and Ground position is 2.512757 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 5.00399994850159 +/- 0.791090412212567
Measured from: -0.0400000214576721
to: 4.96399992704391 [s; relative to TRIGTIME]
T50: 1.57199996709824 +/- 1.58781985355049
Measured from: 0.163999974727631
to: 1.73599994182587 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0879999995231628
to: 0.912000000476837 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0879999995231628
to: 5.31999999284744 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.044612 0.069756 0.058405 0.044513
0.011785 0.012061 0.010720 0.009264 [error]
Peak 0.018644 0.044246 0.047134 0.018646
0.005420 0.005682 0.005348 0.004575 [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 1.10e-08 2.75e-08 5.46e-08 2.71e-07 1.47e-07 3.64e-07 erg/cm2
Error 4.20e-09 6.03e-09 1.02e-08 1.28e-07 2.67e-08 1.31e-07 erg/cm2
Peak flux Power-law 1.92e-01 2.83e-01 3.10e-01 6.37e-01 9.80e-01 1.42e+00 ph/cm2/s
Error 5.53e-02 4.93e-02 4.14e-02 1.91e-01 1.30e-01 2.07e-01 ph/cm2/s
Fluence Cutoff-PL 1.15e-08 2.79e-08 5.40e-08 2.56e-07 1.46e-07 3.48e-07 erg/cm2
Error 4.23e-09 6.08e-09 1.03e-08 -------- 2.68e-08 1.54e-07 erg/cm2
Peak flux Cutoff-PL 1.66e-01 2.89e-01 3.29e-01 3.85e-01 9.57e-01 1.17e+00 ph/cm2/s
Error 6.91e-02 5.33e-02 5.36e-02 -------- 1.37e-01 3.16e-01 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 1.010 0.333 - - 2.53e-03 4.35e-04 49.550 57
CPL 1.023 0.335 9999.4 0.0 2.53e-03 1.21e-03 49.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.868 0.233 - - 8.54e-03 1.14e-03 64.080 57
CPL 0.339 0.932 183.7 0.0 1.45e-02 2.18e-02 63.180 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: 0.384000 sec.
T50 in the 50-300 keV band: 0.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 5.408 -0.088 5.320
T90 5.004 -0.040 4.964
T50 1.572 0.164 1.736
Peak 1.000 -0.088 0.912
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
168.7097 +22.7097 0.0188 22.6 -171.2 0.2215 10.2 TRIG_00677495
------------------------------------------
Foreground time interval of the image:
-0.088 5.320 (delta_t = 5.408 [sec])
Background time interval of the image:
-60.984 -0.088 (delta_t = 60.896 [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 -0.088 sec. to 5.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00994 ( -0.346831 0.318216 )
Norm@50keV : 2.52796E-03 ( -0.000438693 0.000432051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.55 using 59 PHA bins.
# Reduced chi-squared = 0.8693 for 57 degrees of freedom
# Null hypothesis probability = 7.477841e-01
Photon flux (15-150 keV) in 5.408 sec: 0.291270 ( -0.0513559 0.0518359 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47296e-07 ( -2.66213e-08 2.68685e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.088 sec. to 5.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02329 ( -0.367488 0.303481 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.53385E-03 ( -0.000435856 0.00198762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.59 using 59 PHA bins.
# Reduced chi-squared = 0.8855 for 56 degrees of freedom
# Null hypothesis probability = 7.147189e-01
Photon flux (15-150 keV) in 5.408 sec: 0.292622 ( -0.053188 0.050417 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4609e-07 ( -2.55587e-08 2.80594e-08 ) ergs/cm2
Band function
Time interval is from -0.088 sec. to 5.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.853875 ( 0.85387 0.85387 )
beta : -1.00992 ( 1.00992 0.346813 )
Epeak [keV] : 44.4242 ( -44.4324 -44.4324 )
Norm@50keV : 4.10853E-03 ( -0.00200306 184216 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.55 using 59 PHA bins.
# Reduced chi-squared = 0.9009 for 55 degrees of freedom
# Null hypothesis probability = 6.821542e-01
Photon flux (15-150 keV) in 5.408 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] : 21.3467 (-5.66246 10.5796)
R^2/D10^2 : 1.07943E-02 (-0.0106554 0.0185312)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.73 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.804537e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.990e-09 1.926e-09
25- 50 2.591e-08 8.826e-09
50-150 8.811e-08 3.167e-08
15-150 1.190e-07 3.729e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-49.6486 -200)
Norm : 1.21026 (-0.211513 0.211513)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.36 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.251984e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.631e-08 9.440e-09
25- 50 3.137e-08 1.789e-08
50-150 6.880e-08 3.934e-08
15-150 1.165e-07 6.668e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.5674 (-2.44676 2.88358)
R1^2/D10^2 : 8.19863E-02 (-0.0493502 0.125805)
kT2 [keV] : 198.159 (-198.315 -198.315)
R2^2/D10^2 : 6.61555E-05 (-2.23774e-05 0.000489081)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.86 using 59 PHA bins.
# Reduced chi-squared = 0.8156 for 55 degrees of freedom
# Null hypothesis probability = 8.337255e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.071e-08 6.168e-09
25- 50 3.136e-08 1.781e-08
50-150 1.108e-07 3.777e-08
15-150 1.529e-07 6.084e-08
Peak spectrum fit
Power-law model
Time interval is from -0.088 sec. to 0.912 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.868434 ( -0.238865 0.226138 )
Norm@50keV : 8.53621E-03 ( -0.00114836 0.00113493 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.08 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 57 degrees of freedom
# Null hypothesis probability = 2.422742e-01
Photon flux (15-150 keV) in 1 sec: 0.979722 ( -0.130191 0.130754 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.69958e-08 ( -1.32742e-08 1.33675e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.088 sec. to 0.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.339320 ( -1.18411 0.680689 )
Epeak [keV] : 183.702 ( -183.701 -183.701 )
Norm@50keV : 1.44750E-02 ( -0.0136146 0.0300384 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.18 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 56 degrees of freedom
# Null hypothesis probability = 2.375671e-01
Photon flux (15-150 keV) in 1 sec: 0.957343 ( -0.136933 0.136717 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.43984e-08 ( -1.46911e-08 1.43126e-08 ) ergs/cm2
Band function
Time interval is from -0.088 sec. to 0.912 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99999 ( -4.99999 -4.99999 )
beta : -0.892639 ( -0.243448 0.248674 )
Epeak [keV] : 25.6922 ( -25.6922 23.8401 )
Norm@50keV : 436.237 ( -55.5207 1.43215e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.91 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 55 degrees of freedom
# Null hypothesis probability = 1.920532e-01
Photon flux (15-150 keV) in 1 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] : 23.3878 (-3.81362 5.12617)
R^2/D10^2 : 2.98098E-02 (-0.0134697 0.022229)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.34 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.444613e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.931e-09 7.680e-10
25- 50 1.605e-08 3.540e-09
50-150 6.553e-08 1.503e-08
15-150 8.451e-08 1.673e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-26.9613 -200)
Norm : 3.95670 (-0.5438 0.5438)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.61 using 59 PHA bins.
# Reduced chi-squared = 1.537 for 57 degrees of freedom
# Null hypothesis probability = 5.677037e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.855e-09 5.590e-09
25- 50 1.896e-08 1.072e-08
50-150 4.158e-08 2.355e-08
15-150 7.039e-08 3.927e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 13.9161 (-7.45581 7.10707)
R1^2/D10^2 : 9.66872E-02 (-0.059305 0.621222)
kT2 [keV] : 64.1306 (-65.1217 -65.1218)
R2^2/D10^2 : 1.26122E-03 (-0.0010575 0.0194785)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.54 using 59 PHA bins.
#Fit statistic : Chi-Squared = 62.52 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 55 degrees of freedom
# Reduced chi-squared = 1.137 for 55 degrees of freedom
# Null hypothesis probability = 2.262894e-01
# Null hypothesis probability = 2.268256e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.493e-09 2.542e-09
25- 50 1.810e-08 1.053e-08
50-150 7.205e-08 3.543e-08
15-150 9.465e-08 4.747e-08
Plot creation:
Fri Mar 4 17:51:04 EST 2016