batgrbproduct Analysis for Trigger=632888
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 1 00:27:31 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger632888/GCN5_download_cron
======================================================================
Trigger: 00632888 Segment: 000
BAT Trigger Time: 446792018.272 [s; MET]
Trigger Stop: 446792018.288 [s; MET]
UTC: 2015-02-28T04:53:25.026660 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 26.5712526301239 Dec: 61.7679194804966 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 12.98
Image Trigger?: NO
Rate S/N Ratio: 78.0128194593683 [ if not an image trigger ]
Image S/N Ratio: 12.98
Flight Position: [ source = BAT ]
RA: 26.5712526301239 Dec: 61.7679194804966 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 26.60316105901 Dec: 61.7464887665591 [deg; J2000]
{ 01h 46m 24.8s , +61d 44' 47.4" }
+/- 1.65708008361772 [arcmin] (estimated 90% radius based on SNR)
+/- 0.499306336184983 [arcmin] (formal 1-sigma fit error)
SNR: 14.783270593141
Angular difference between Flight and Ground position is 1.572945 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 187.907999932766 +/- 113.761565837426
Measured from: -8.75999987125397
to: 179.148000061512 [s; relative to TRIGTIME]
T50: 31.9359999299049 +/- 33.4778451828724
Measured from: -0.531999886035919
to: 31.404000043869 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.23600000143051
to: 10.2360000014305 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.08000004291534
to: 273.783999979496 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.860486 0.682773 0.462685 0.067486
0.094548 0.098704 0.088780 0.082285 [error]
Peak 0.056275 0.084717 0.099022 0.009500
0.009430 0.010672 0.010074 0.007296 [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 2.47e-07 3.32e-07 3.29e-07 5.86e-07 1.10e-06 1.49e-06 erg/cm2
Error 4.87e-08 4.67e-08 8.73e-08 3.12e-07 1.95e-07 4.07e-07 erg/cm2
Peak flux Power-law 5.80e-01 6.63e-01 5.43e-01 7.44e-01 2.06e+00 2.53e+00 ph/cm2/s
Error 1.23e-01 8.89e-02 7.43e-02 2.05e-01 2.51e-01 3.10e-01 ph/cm2/s
Fluence Cutoff-PL 2.46e-07 3.32e-07 3.28e-07 5.76e-07 1.10e-06 1.44e-06 erg/cm2
Error 3.70e-08 4.69e-08 8.73e-08 4.94e-07 1.94e-07 4.70e-07 erg/cm2
Peak flux Cutoff-PL 4.63e-01 7.02e-01 6.10e-01 3.67e-01 2.00e+00 2.14e+00 ph/cm2/s
Error 1.58e-01 1.03e-01 9.91e-02 2.50e-01 2.59e-01 3.61e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.10e-01 6.95e-01 5.88e-01 4.49e-01 2.03e+00 2.24e+00 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 2.015 0.291 - - 4.21e-04 7.96e-05 64.950 57
CPL 2.196 0.000 83.4 0.0 3.35e-04 0.00e+00 64.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.288 0.191 - - 1.73e-02 2.05e-03 52.410 57
CPL 0.374 0.922 101.2 168.3 4.49e-02 5.07e-02 48.760 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: 164.864000 sec.
T50 in the 50-300 keV band: 16.768000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 282.864 -9.080 273.784
T90 187.908 -8.760 179.148
T50 31.936 -0.532 31.404
Peak 1.000 9.236 10.236
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
26.6032 +61.7465 0.0129 31.7 -103.9 1.3998 14.8 TRIG_00632888
------------------------------------------
Foreground time interval of the image:
-9.080 15.229 (delta_t = 24.309 [sec])
Background time interval of the image:
-239.272 -198.332 (delta_t = 40.940 [sec])
-197.272 -9.080 (delta_t = 188.192 [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 -9.080 sec. to 273.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01464 ( -0.277417 0.304181 )
Norm@50keV : 4.20800E-04 ( -8.14612e-05 7.77343e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.95 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 57 degrees of freedom
# Null hypothesis probability = 2.194676e-01
Photon flux (15-150 keV) in 282.9 sec: 6.35486E-02 ( -0.00871047 0.00871084 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09871e-06 ( -1.91526e-07 1.98098e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.080 sec. to 273.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19581 ( )
Epeak [keV] : 83.4365 ( )
Norm@50keV : 3.35377E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.71 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 56 degrees of freedom
# Null hypothesis probability = 1.986781e-01
Photon flux (15-150 keV) in 282.9 sec: 6.35368E-02 ( -0.0087268 0.0087061 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10023e-06 ( -1.96335e-07 1.92253e-07 ) ergs/cm2
Band function
Time interval is from -9.080 sec. to 273.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55901 ( 1.56035 1.56035 )
beta : -2.01381 ( 2.01418 0.276986 )
Epeak [keV] : 13.4156 ( -11.9414 -11.9414 )
Norm@50keV : 1.18981E-03 ( -0.00122467 0.756436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.95 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 55 degrees of freedom
# Null hypothesis probability = 1.687094e-01
Photon flux (15-150 keV) in 282.9 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] : 9.07288 (-1.85074 2.46022)
R^2/D10^2 : 4.04973E-02 (-0.0401644 0.0575566)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.32 using 59 PHA bins.
# Reduced chi-squared = 1.514 for 57 degrees of freedom
# Null hypothesis probability = 7.344489e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.844e-07 5.249e-08
25- 50 3.968e-07 9.108e-08
50-150 1.552e-07 6.722e-08
15-150 7.364e-07 1.605e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 69.7581 (-27.0249 59.7357)
Norm : 0.308923 (-0.0650119 0.089679)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.59 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 57 degrees of freedom
# Null hypothesis probability = 1.591451e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.241e-07 4.128e-08
25- 50 3.563e-07 6.159e-08
50-150 4.564e-07 2.269e-07
15-150 1.037e-06 2.391e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.63617 (-1.34396 1.64839)
R1^2/D10^2 : 0.456052 (-0.324751 1.80571)
kT2 [keV] : 20.9327 (-6.13884 12.5526)
R2^2/D10^2 : 1.40450E-03 (-0.00112599 0.00208044)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.03 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Null hypothesis probability = 1.892585e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.626e-07 1.372e-07
25- 50 2.929e-07 1.432e-07
50-150 5.551e-07 3.226e-07
15-150 1.111e-06 5.608e-07
Peak spectrum fit
Power-law model
Time interval is from 9.236 sec. to 10.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28798 ( -0.190654 0.190973 )
Norm@50keV : 1.72720E-02 ( -0.00205011 0.00204914 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.41 using 59 PHA bins.
# Reduced chi-squared = 0.9194 for 57 degrees of freedom
# Null hypothesis probability = 6.478615e-01
Photon flux (15-150 keV) in 1 sec: 2.05610 ( -0.250631 0.251029 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71183e-07 ( -2.21093e-08 2.2215e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.236 sec. to 10.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.373927 ( -1.02244 0.822392 )
Epeak [keV] : 101.180 ( -26.5814 310.002 )
Norm@50keV : 4.49438E-02 ( -0.0255641 0.0759093 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.76 using 59 PHA bins.
# Reduced chi-squared = 0.8707 for 56 degrees of freedom
# Null hypothesis probability = 7.428490e-01
Photon flux (15-150 keV) in 1 sec: 1.99865 ( -0.25929 0.25808 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67661e-07 ( -2.2601e-08 2.27e-08 ) ergs/cm2
Band function
Time interval is from 9.236 sec. to 10.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.374452 ( -0.582586 1.4422 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 101.166 ( -26.5771 233.695 )
Norm@50keV : 4.49315E-02 ( -0.0255488 0.0759787 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.76 using 59 PHA bins.
# Reduced chi-squared = 0.8866 for 55 degrees of freedom
# Null hypothesis probability = 7.104423e-01
Photon flux (15-150 keV) in 1 sec: 2.03010 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69177e-07 ( -1.6917e-07 -2.4334e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.3674 (-2.34738 2.74101)
R^2/D10^2 : 0.109540 (-0.0396926 0.0596867)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.15 using 59 PHA bins.
# Reduced chi-squared = 0.9675 for 57 degrees of freedom
# Null hypothesis probability = 5.449624e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.020e-09 2.050e-09
25- 50 3.909e-08 7.475e-09
50-150 1.081e-07 2.247e-08
15-150 1.553e-07 2.520e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.57006 (-1.02708 1.02703)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.47 using 59 PHA bins.
# Reduced chi-squared = 0.9907 for 57 degrees of freedom
# Null hypothesis probability = 4.948603e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.134e-08 1.187e-08
25- 50 4.105e-08 2.264e-08
50-150 9.002e-08 4.891e-08
15-150 1.524e-07 8.430e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.10027 (-2.01663 2.62191)
R1^2/D10^2 : 11.2280 (-9.88634 533.769)
kT2 [keV] : 22.1150 (-3.17312 4.35487)
R2^2/D10^2 : 6.51833E-02 (-0.0309522 0.044163)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.08 using 59 PHA bins.
# Reduced chi-squared = 0.8014 for 55 degrees of freedom
# Null hypothesis probability = 8.542683e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.738e-08 7.714e-09
25- 50 3.567e-08 9.535e-09
50-150 1.141e-07 3.497e-08
15-150 1.672e-07 4.327e-08
Plot creation:
Sun Mar 1 00:35:36 EST 2015