batgrbproduct Analysis for Trigger=622476
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): Fri Dec 26 15:34:31 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger622476/GCN5_download_cron
======================================================================
Trigger: 00622476 Segment: 000
BAT Trigger Time: 441241280 [s; MET]
Trigger Stop: 441241360 [s; MET]
UTC: 2014-12-25T23:01:07.034720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 138.750633927598 Dec: 33.7947041860652 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.93
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.93
Flight Position: [ source = BAT ]
RA: 138.750633927598 Dec: 33.7947041860652 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 138.753041341835 Dec: 33.7728122422065 [deg; J2000]
{ 09h 15m 00.7s , +33d 46' 22.1" }
+/- 2.21706942947104 [arcmin] (estimated 90% radius based on SNR)
+/- 0.871702943622499 [arcmin] (formal 1-sigma fit error)
SNR: 9.75321865131616
Angular difference between Flight and Ground position is 1.318992 arcmin
Partial Coding Fraction: 0.2617188 [ including projection effects ]
Duration
T90: 40.9280000329018 +/- 6.71550802409261
Measured from: 6.60000014305115
to: 47.5280001759529 [s; relative to TRIGTIME]
T50: 17.3440000414848 +/- 3.86727810644922
Measured from: 12.0080001354218
to: 29.3520001769066 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.755999982357
to: 12.755999982357 [s; relative to TRIGTIME]
Total Fluence
Measured from: 5.49599999189377
to: 52.6320000290871 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.727121 1.235576 1.124870 0.456085
0.101811 0.106513 0.093430 0.079014 [error]
Peak 0.018163 0.064589 0.076958 0.040222
0.015578 0.016301 0.014951 0.012124 [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 2.78e-07 5.69e-07 9.08e-07 3.23e-06 2.52e-06 4.99e-06 erg/cm2
Error 4.83e-08 5.88e-08 8.79e-08 7.14e-07 2.23e-07 7.55e-07 erg/cm2
Peak flux Power-law 2.40e-01 3.68e-01 4.24e-01 9.37e-01 1.31e+00 1.97e+00 ph/cm2/s
Error 1.73e-01 1.65e-01 1.07e-01 5.28e-01 4.09e-01 5.17e-01 ph/cm2/s
Fluence Cutoff-PL 2.79e-07 5.70e-07 9.08e-07 3.19e-06 2.52e-06 4.95e-06 erg/cm2
Error 3.75e-08 5.92e-08 9.16e-08 -------- 2.22e-07 1.10e-06 erg/cm2
Peak flux Cutoff-PL 2.46e-01 3.74e-01 4.25e-01 9.16e-01 1.32e+00 1.96e+00 ph/cm2/s
Error 2.20e-01 1.66e-01 1.23e-01 6.17e-01 4.08e-01 6.49e-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 1.325 0.152 - - 5.44e-03 4.66e-04 65.610 57
CPL 1.321 0.321 10000.0 0.0 5.47e-03 4.65e-04 65.620 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.795 0.532 - - 1.14e-02 3.75e-03 52.230 57
CPL 0.787 0.609 10000.0 0.0 1.15e-02 -3.76e-03 52.230 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: 25.216000 sec.
T50 in the 50-300 keV band: 12.800000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 47.136 5.496 52.632
T90 40.928 6.600 47.528
T50 17.344 12.008 29.352
Peak 1.000 11.756 12.756
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
138.7530 +33.7728 0.0197 47.7 177.6 3.2070 9.8 TRIG_00622476
------------------------------------------
Foreground time interval of the image:
5.496 52.632 (delta_t = 47.136 [sec])
Background time interval of the image:
-15.799 5.496 (delta_t = 21.295 [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 5.496 sec. to 52.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32499 ( -0.153464 0.150861 )
Norm@50keV : 5.44296E-03 ( -0.000466869 0.000465543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.61 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 57 degrees of freedom
# Null hypothesis probability = 2.030105e-01
Photon flux (15-150 keV) in 47.14 sec: 0.652448 ( -0.0610881 0.0613698 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52037e-06 ( -2.23082e-07 2.23605e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.496 sec. to 52.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32123 ( -0.450745 0.191771 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 5.46514E-03 ( -0.00046485 0.000464164 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.62 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 56 degrees of freedom
# Null hypothesis probability = 1.777608e-01
Photon flux (15-150 keV) in 47.14 sec: 0.652331 ( -0.0308 0.060825 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51932e-06 ( -2.21294e-07 2.2342e-07 ) ergs/cm2
Band function
Time interval is from 5.496 sec. to 52.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05793 ( 1.05793 1.05793 )
beta : -1.32499 ( 1.32499 0.153615 )
Epeak [keV] : 38.0177 ( -38.0177 -38.0177 )
Norm@50keV : 1.07102E-02 ( -0.00573151 0.792339 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.61 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 55 degrees of freedom
# Null hypothesis probability = 1.548555e-01
Photon flux (15-150 keV) in 47.14 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] : 19.0273 (-2.10095 2.48896)
R^2/D10^2 : 3.36532E-02 (-0.0116189 0.016888)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.66 using 59 PHA bins.
# Reduced chi-squared = 1.8010 for 57 degrees of freedom
# Null hypothesis probability = 1.996149e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.128e-07 2.039e-08
25- 50 5.432e-07 7.066e-08
50-150 1.446e-06 2.053e-07
15-150 2.102e-06 2.373e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.77322 (-0.238616 0.238563)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.73 using 59 PHA bins.
# Reduced chi-squared = 1.311 for 57 degrees of freedom
# Null hypothesis probability = 5.757650e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.256e-07 3.693e-08
25- 50 6.264e-07 1.006e-07
50-150 1.374e-06 5.529e-07
15-150 2.326e-06 5.501e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.57634 (-3.25062 3.39979)
R1^2/D10^2 : 0.240886 (-0.14118 0.662723)
kT2 [keV] : 44.8981 (-17.8816 -45.4341)
R2^2/D10^2 : 1.68217E-03 (-0.00133933 0.00662719)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.45 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 55 degrees of freedom
# Null hypothesis probability = 1.051638e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.276e-07 9.046e-08
25- 50 6.208e-07 2.179e-07
50-150 1.683e-06 7.817e-07
15-150 2.531e-06 9.763e-07
Peak spectrum fit
Power-law model
Time interval is from 11.756 sec. to 12.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.795240 ( -0.585017 0.479805 )
Norm@50keV : 1.13826E-02 ( -0.00393673 0.00356939 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 59 PHA bins.
# Reduced chi-squared = 0.9163 for 57 degrees of freedom
# Null hypothesis probability = 6.543620e-01
Photon flux (15-150 keV) in 1 sec: 1.30844 ( -0.402522 0.416347 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33283e-07 ( -3.36066e-08 3.3606e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.756 sec. to 12.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.786670 ( -1.92042 -0.702769 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 1.14607E-02 ( -0.0039466 -0.0114611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 59 PHA bins.
# Reduced chi-squared = 0.9328 for 56 degrees of freedom
# Null hypothesis probability = 6.181736e-01
Photon flux (15-150 keV) in 1 sec: 1.31805 ( -0.412759 0.40271 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33281e-07 ( -3.35876e-08 3.3629e-08 ) ergs/cm2
Band function
Time interval is from 11.756 sec. to 12.756 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.718909 ( 0.718819 0.718819 )
beta : -0.805501 ( -0.470214 0.594778 )
Epeak [keV] : 14.8388 ( -14.8054 -14.8054 )
Norm@50keV : 1.74965E-02 ( -0.00943041 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 59 PHA bins.
# Reduced chi-squared = 0.9496 for 55 degrees of freedom
# Null hypothesis probability = 5.811662e-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] : 33.6289 (-10.5215 25.359)
R^2/D10^2 : 1.37794E-02 (-0.0137794 0.0293854)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.11 using 59 PHA bins.
# Reduced chi-squared = 0.9669 for 57 degrees of freedom
# Null hypothesis probability = 5.462583e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.266e-09 1.461e-09
25- 50 1.461e-08 8.840e-09
50-150 1.106e-07 6.530e-08
15-150 1.275e-07 7.325e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.00968 (-1.67867 1.67795)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.03 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.664711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.499e-08 9.160e-09
25- 50 2.883e-08 1.740e-08
50-150 6.322e-08 3.771e-08
15-150 1.070e-07 6.575e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.73554 (-4.6581 11.7684)
R1^2/D10^2 : 0.790925 (-0.780052 28.471)
kT2 [keV] : 48.4300 (-41.732 -48.3373)
R2^2/D10^2 : 4.59812E-03 (-0.00434852 0.019135)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.64 using 59 PHA bins.
# Reduced chi-squared = 0.9388 for 55 degrees of freedom
# Null hypothesis probability = 6.039818e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.544e-09 5.895e-09
25- 50 2.241e-08 1.262e-08
50-150 1.057e-07 5.790e-08
15-150 1.377e-07 7.180e-08
Plot creation:
Fri Dec 26 15:39:17 EST 2014