batgrbproduct Analysis for Trigger=631051
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): Sat Feb 14 19:56:37 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger631051/GCN5_download_cron
======================================================================
Trigger: 00631051 Segment: 000
BAT Trigger Time: 445559504 [s; MET]
Trigger Stop: 445559568 [s; MET]
UTC: 2015-02-13T22:31:30.817240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 253.42510590632 Dec: 34.1786965238723 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.03
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.03
Flight Position: [ source = BAT ]
RA: 253.42510590632 Dec: 34.1786965238723 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 253.44769651815 Dec: 34.165143611981 [deg; J2000]
{ 16h 53m 47.4s , +34d 09' 54.5" }
+/- 1.8302045133491 [arcmin] (estimated 90% radius based on SNR)
+/- 0.856204606183085 [arcmin] (formal 1-sigma fit error)
SNR: 12.8268176283291
Angular difference between Flight and Ground position is 1.385228 arcmin
Partial Coding Fraction: 0.1367188 [ including projection effects ]
Duration
T90: 181.199999988079 +/- 59.5624950529898
Measured from: 9.51200014352798
to: 190.712000131607 [s; relative to TRIGTIME]
T50: 66.0160000324249 +/- 13.9608136973277
Measured from: 25.240000128746
to: 91.256000161171 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 18.0759999752045
to: 19.0759999752045 [s; relative to TRIGTIME]
Total Fluence
Measured from: 2.08799999952316
to: 249.783999979496 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.407364 2.359398 1.194538 0.494553
0.165556 0.161700 0.135255 0.109446 [error]
Peak 0.068817 0.040668 0.003524 0.019988
0.016741 0.015902 0.012545 0.011656 [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 5.84e-07 9.10e-07 1.07e-06 2.42e-06 3.27e-06 4.98e-06 erg/cm2
Error 7.97e-08 8.08e-08 1.31e-07 6.05e-07 3.16e-07 7.28e-07 erg/cm2
Peak flux Power-law 6.59e-01 3.06e-01 8.62e-02 3.03e-02 1.07e+00 1.08e+00 ph/cm2/s
Error 2.94e-01 1.45e-01 9.11e-02 6.01e-02 4.13e-01 4.20e-01 ph/cm2/s
Fluence Cutoff-PL 5.25e-07 1.02e-06 1.06e-06 6.15e-07 3.00e-06 3.22e-06 erg/cm2
Error 9.05e-08 1.15e-07 1.59e-07 6.63e-07 3.68e-07 7.51e-07 erg/cm2
Peak flux Cutoff-PL 7.36e-01 2.50e-01 2.07e-04 4.88e-13 9.87e-01 9.86e-01 ph/cm2/s
Error 3.34e-01 2.09e-01 5.67e-02 0.00e+00 3.82e-01 3.82e-01 ph/cm2/s
Fluence Band 4.57e-07 1.10e-06 9.83e-07 1.43e-06 3.06e-06 3.98e-06 erg/cm2
Error 1.01e-07 1.23e-07 1.50e-07 -------- 3.29e-07 7.23e-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 1.770 0.148 - - 1.43e-03 1.34e-04 63.370 57
CPL 0.807 0.785 54.9 20.9 4.89e-03 6.57e-03 57.380 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.830 0.952 - - 4.39e-03 3.13e-03 63.620 57
CPL 1.000 0.000 50.0 0.0 1.88e-02 0.00e+00 68.730 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: 97.344000 sec.
T50 in the 50-300 keV band: 42.688000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 247.696 2.088 249.784
T90 181.200 9.512 190.712
T50 66.016 25.240 91.256
Peak 1.000 18.076 19.076
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
253.4477 +34.1651 0.0150 38.7 119.5 3.7348 12.8 TRIG_00631051
------------------------------------------
Foreground time interval of the image:
2.088 72.601 (delta_t = 70.513 [sec])
Background time interval of the image:
-239.000 2.088 (delta_t = 241.088 [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 2.088 sec. to 249.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77042 ( -0.147094 0.149673 )
Norm@50keV : 1.43122E-03 ( -0.000134991 0.000133873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.37 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 57 degrees of freedom
# Null hypothesis probability = 2.619279e-01
Photon flux (15-150 keV) in 247.7 sec: 0.195002 ( -0.0175285 0.0175593 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26771e-06 ( -3.14686e-07 3.17249e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.088 sec. to 249.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.806933 ( -0.875693 0.695209 )
Epeak [keV] : 54.8637 ( -9.93881 31.9309 )
Norm@50keV : 4.88552E-03 ( -0.00284198 0.0102963 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.38 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 56 degrees of freedom
# Null hypothesis probability = 4.238057e-01
Photon flux (15-150 keV) in 247.7 sec: 0.188172 ( -0.018239 0.018233 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00255e-06 ( -3.66224e-07 3.70683e-07 ) ergs/cm2
Band function
Time interval is from 2.088 sec. to 249.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.50145 ( -4.65318 -4.50145 )
beta : -2.22384 ( -0.288251 0.246601 )
Epeak [keV] : 31.8132 ( -3.24036 3.2233 )
Norm@50keV : 21.4272 ( -1.83876 94.1507 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.13 using 59 PHA bins.
# Reduced chi-squared = 0.9115 for 55 degrees of freedom
# Null hypothesis probability = 6.607937e-01
Photon flux (15-150 keV) in 247.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06009e-06 ( -3.05835e-06 -3.25948e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.3253 (-1.05582 1.19806)
R^2/D10^2 : 5.96121E-02 (-0.0190857 0.0270281)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.50 using 59 PHA bins.
# Reduced chi-squared = 1.254 for 57 degrees of freedom
# Null hypothesis probability = 9.360481e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.978e-07 6.490e-08
25- 50 1.167e-06 1.258e-07
50-150 8.643e-07 1.804e-07
15-150 2.429e-06 2.587e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9646 (-25.3578 47.6657)
Norm : 0.870715 (-0.10691 0.117393)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.47 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.213127e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.637e-07 6.985e-08
25- 50 9.747e-07 9.375e-08
50-150 1.579e-06 5.612e-07
15-150 3.118e-06 6.527e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.76554 (-1.40635 1.39767)
R1^2/D10^2 : 0.128839 (-0.0504825 0.0936405)
kT2 [keV] : 37.0631 (-14.8317 116.221)
R2^2/D10^2 : 4.57147E-04 (-0.000434989 0.00237287)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.27 using 59 PHA bins.
# Reduced chi-squared = 0.8959 for 55 degrees of freedom
# Null hypothesis probability = 6.921283e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.918e-07 1.196e-07
25- 50 1.101e-06 2.965e-07
50-150 1.561e-06 7.602e-07
15-150 3.153e-06 1.078e-06
Peak spectrum fit
Power-law model
Time interval is from 18.076 sec. to 19.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.82966 ( -0.817737 1.08617 )
Norm@50keV : 4.38708E-03 ( -0.00290296 0.00336357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.62 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.548745e-01
Photon flux (15-150 keV) in 1 sec: 1.06903 ( -0.412608 0.413136 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.89926e-08 ( -2.19201e-08 2.51787e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.076 sec. to 19.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.88245E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.73 using 59 PHA bins.
# Reduced chi-squared = 1.227 for 56 degrees of freedom
# Null hypothesis probability = 1.182383e-01
Photon flux (15-150 keV) in 1 sec: 0.986775 ( -0.358063 0.406155 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50993e-08 ( -1.28863e-08 1.96641e-08 ) ergs/cm2
Band function
Time interval is from 18.076 sec. to 19.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92485 ( -4.92485 -4.92485 )
beta : -4.65264 ( 4.65264 2.17097 )
Epeak [keV] : 21.4791 ( -21.4791 5.89641 )
Norm@50keV : 4301.65 ( -1549.69 2.80571e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.04 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 55 degrees of freedom
# Null hypothesis probability = 2.677770e-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] : 5.29933 (-1.53631 2.256)
R^2/D10^2 : 7.18814 (-7.18827 29.7181)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.75 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 57 degrees of freedom
# Null hypothesis probability = 3.101845e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.194e-08 1.315e-08
25- 50 1.649e-08 1.031e-08
50-150 8.817e-10 8.915e-10
15-150 3.931e-08 2.363e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.5760 (-8.76018 25.4743)
Norm : 15.3984 (-9.72472 29.1843)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.79 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.786289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.122e-08 1.333e-08
25- 50 1.673e-08 1.107e-08
50-150 3.996e-09 3.938e-09
15-150 4.195e-08 2.684e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.10395 (-5.29687 194.684)
R1^2/D10^2 : 8.31811 (-6.99508 -6.99508)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 9.70415E-05 (-9.56441e-05 0.000126204)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.75 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.00 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 55 degrees of freedom
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 2.475689e-01
# Null hypothesis probability = 3.314166e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.194e-08 8.760e-01
25- 50 1.648e-08 6.040e+00
50-150 8.790e-10 1.571e+02
15-150 3.930e-08 1.650e+02
Plot creation:
Sat Feb 14 20:00:57 EST 2015