batgrbproduct Analysis for Trigger=626581
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 Jan 18 10:06:44 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger626581/GCN5_download_cron
======================================================================
Trigger: 00626581 Segment: 000
BAT Trigger Time: 443234104 [s; MET]
Trigger Stop: 443234744 [s; MET]
UTC: 2015-01-18T00:34:50.934560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 152.370111218417 Dec: -58.275395728891 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 24.54
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 24.54
Flight Position: [ source = BAT ]
RA: 152.370111218417 Dec: -58.275395728891 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 152.35932743948 Dec: -58.2703648419523 [deg; J2000]
{ 10h 09m 26.2s , -58d 16' 13.3" }
+/- 0.938702478735881 [arcmin] (estimated 90% radius based on SNR)
+/- 0.337014997101159 [arcmin] (formal 1-sigma fit error)
SNR: 33.2938596741413
Angular difference between Flight and Ground position is 0.454850 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 847.915999948978 +/- 182.714234371256
Measured from: -92.9839999079704
to: 754.932000041008 [s; relative to TRIGTIME]
T50: 382.287999987602 +/- 77.3105613489231
Measured from: 281.840000092983
to: 664.128000080585 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 639.34399998188
to: 640.34399998188 [s; relative to TRIGTIME]
Total Fluence
Measured from: -210.51599997282
to: 776.244000017643 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 12.295996 9.767863 1.145495 -0.189046
0.183348 0.182619 0.155827 0.150424 [error]
Peak 0.033631 0.022099 0.012749 0.013647
0.006036 0.006132 0.004883 0.004619 [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 5.03e-06 3.72e-06 1.83e-06 1.28e-06 1.12e-05 1.19e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 3.17e-01 2.10e-01 9.09e-02 5.39e-02 6.45e-01 6.72e-01 ph/cm2/s
Error 9.98e-02 5.08e-02 4.27e-02 4.91e-02 1.47e-01 1.56e-01 ph/cm2/s
Fluence Cutoff-PL 3.89e-06 4.34e-06 1.04e-06 2.69e-08 9.29e-06 9.29e-06 erg/cm2
Error 3.01e-07 1.59e-07 1.59e-07 1.90e-08 4.03e-07 4.04e-07 erg/cm2
Peak flux Cutoff-PL 3.20e-01 2.10e-01 8.92e-02 5.16e-02 6.45e-01 6.71e-01 ph/cm2/s
Error 9.95e-02 5.12e-02 4.23e-02 6.12e-02 1.47e-01 1.56e-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 3.023 0.000 - - 9.33e-04 0.00e+00 167.730 57
CPL 0.028 0.588 23.2 2.5 6.60e-02 0.00e+00 42.070 56
The chi2 of BB fit is 61.43 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.211 0.520 - - 3.87e-03 1.37e-03 63.190 57
CPL 1.987 0.000 4.4 0.0 4.79e-03 0.00e+00 63.590 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 986.760 -210.516 776.244
T90 847.916 -92.984 754.932
T50 382.288 281.840 664.128
Peak 1.000 639.344 640.344
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
152.3593 -58.2704 0.0058 26.4 -35.5 17.5567 33.3 TRIG_00626581
------------------------------------------
Foreground time interval of the image:
-13.799 717.501 (delta_t = 731.300 [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 -210.516 sec. to 776.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.02262 ( )
Norm@50keV : 9.32868E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 167.73 using 59 PHA bins.
# Reduced chi-squared = 2.9426 for 57 degrees of freedom
# Null hypothesis probability = 7.711688e-13
Photon flux (15-150 keV) in 986.8 sec: 0.260818 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11771e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -210.516 sec. to 776.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.83931E-02 ( -0.613894 0.562193 )
Epeak [keV] : 23.1654 ( -2.85692 2.16808 )
Norm@50keV : 6.60044E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.07 using 59 PHA bins.
# Reduced chi-squared = 0.7513 for 56 degrees of freedom
# Null hypothesis probability = 9.161455e-01
Photon flux (15-150 keV) in 986.8 sec: 0.220637 ( -0.01109 0.011217 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.29281e-06 ( -3.99693e-07 4.06611e-07 ) ergs/cm2
Band function
Time interval is from -210.516 sec. to 776.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.11912E-02 ( -0.52257 0.658783 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 23.1469 ( -2.84205 2.18088 )
Norm@50keV : 6.57769E-02 ( -0.0361548 0.0936781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.08 using 59 PHA bins.
# Reduced chi-squared = 0.7651 for 55 degrees of freedom
# Null hypothesis probability = 8.995993e-01
Photon flux (15-150 keV) in 986.8 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] : 6.98789 (-0.20972 0.215859)
R^2/D10^2 : 0.427085 (-0.0579323 0.0674072)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.43 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.204818e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.300e-06 1.831e-07
25- 50 4.504e-06 1.648e-07
50-150 7.418e-07 8.723e-08
15-150 8.546e-06 2.748e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.8073 (-1.25596 1.36091)
Norm : 2.69585 (-0.227157 0.249886)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.52 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.841813e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.424e-06 2.309e-07
25- 50 4.132e-06 1.382e-07
50-150 1.426e-06 1.579e-07
15-150 9.982e-06 3.261e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.88398 (-1.11815 1.29792)
R1^2/D10^2 : 2.36881 (-1.48034 9.57579)
kT2 [keV] : 8.05262 (-0.652966 1.2722)
R2^2/D10^2 : 0.181215 (-0.115731 0.0660304)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.95 using 59 PHA bins.
# Reduced chi-squared = 0.7445 for 55 degrees of freedom
# Null hypothesis probability = 9.206815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.947e-06 1.489e-06
25- 50 4.340e-06 1.216e-06
50-150 1.007e-06 2.685e-07
15-150 9.294e-06 2.841e-06
Peak spectrum fit
Power-law model
Time interval is from 639.344 sec. to 640.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21100 ( -0.474326 0.566189 )
Norm@50keV : 3.87483E-03 ( -0.00141653 0.00131671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.669458e-01
Photon flux (15-150 keV) in 1 sec: 0.645222 ( -0.14744 0.147441 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64882e-08 ( -1.06415e-08 1.1261e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 639.344 sec. to 640.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98705 ( )
Epeak [keV] : 4.41118 ( )
Norm@50keV : 4.79431E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.59 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 56 degrees of freedom
# Null hypothesis probability = 2.266911e-01
Photon flux (15-150 keV) in 1 sec: 0.644838 ( -0.147365 0.147335 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.61832e-08 ( -1.04025e-08 1.15536e-08 ) ergs/cm2
Band function
Time interval is from 639.344 sec. to 640.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.57953 ( 1.57989 1.57989 )
beta : -2.22646 ( 2.2292 0.490796 )
Epeak [keV] : 14.6077 ( -14.446 -14.446 )
Norm@50keV : 1.24030E-02 ( -0.0124963 2.217e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.17 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 2.100687e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.03855e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.82311 (-2.076 3.0509)
R^2/D10^2 : 1.28126 (-0.979807 4.64736)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.17 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 57 degrees of freedom
# Null hypothesis probability = 9.818992e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.324e-09 5.510e-09
25- 50 1.215e-08 7.380e-09
50-150 1.833e-09 1.458e-09
15-150 2.330e-08 1.336e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.5959 (-24.7887 86.5261)
Norm : 3.74406 (-1.43541 3.07951)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.24 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.120622e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.998e-09 3.023e-09
25- 50 1.259e-08 4.237e-09
50-150 1.142e-08 7.550e-09
15-150 3.301e-08 1.547e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.82472 (-1.66469 2.41845)
R1^2/D10^2 : 4.84129 (-3.91506 28.8641)
kT2 [keV] : 30.3109 (-13.6419 -30.4358)
R2^2/D10^2 : 3.61415E-03 (-0.00352131 0.0750307)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.08 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 55 degrees of freedom
# Null hypothesis probability = 2.386016e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.070e-08 6.215e-09
25- 50 9.282e-09 5.065e-09
50-150 2.087e-08 1.321e-08
15-150 4.086e-08 2.145e-08
Plot creation:
Sun Jan 18 10:11:25 EST 2015