batgrbproduct Analysis for Trigger=631946
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 Feb 22 05:26:33 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger631946/GCN5_download_cron
======================================================================
Trigger: 00631946 Segment: 000
BAT Trigger Time: 446168344 [s; MET]
Trigger Stop: 446169688 [s; MET]
UTC: 2015-02-20T23:38:50.786320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.227007499147 Dec: -20.3786233408237 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.99
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.99
Flight Position: [ source = BAT ]
RA: 267.227007499147 Dec: -20.3786233408237 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.152968070549 Dec: -20.3624703295515 [deg; J2000]
{ 17h 48m 36.7s , -20d 21' 44.9" }
+/- 4.26287129308745 [arcmin] (estimated 90% radius based on SNR)
+/- 2.62441950857341 [arcmin] (formal 1-sigma fit error)
SNR: 3.8330437777879
Angular difference between Flight and Ground position is 4.275833 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 1344 +/-
Measured from: 0
to: 1344 [s; relative to TRIGTIME]
T50: 1344 +/-
Measured from: 0
to: 1344 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1344 second)
Measured from: 0
to: 1344 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1344 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.642636 0.951956 0.465998 0.006458
0.175408 0.160126 0.128910 0.104131 [error]
Peak 1.642636 0.951956 0.465998 0.006458
0.175408 0.160126 0.128910 0.104131 [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 4.56e-07 4.53e-07 3.16e-07 3.48e-07 1.36e-06 1.57e-06 erg/cm2
Error 8.84e-08 7.78e-08 1.15e-07 2.44e-07 2.58e-07 4.00e-07 erg/cm2
Peak flux Power-law 1.85e-02 1.03e-02 3.57e-03 1.63e-03 3.32e-02 3.39e-02 ph/cm2/s
Error 3.68e-03 1.69e-03 1.26e-03 1.06e-03 4.89e-03 5.01e-03 ph/cm2/s
Fluence Cutoff-PL 4.57e-07 4.52e-07 3.15e-07 3.20e-07 1.36e-06 1.54e-06 erg/cm2
Error 8.94e-08 8.52e-08 1.20e-07 3.23e-07 2.61e-07 4.43e-07 erg/cm2
Peak flux Cutoff-PL 1.85e-02 1.02e-02 3.51e-03 1.56e-03 3.32e-02 3.39e-02 ph/cm2/s
Error -------- -------- -------- -------- -------- 4.99e-03 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 2.521 0.366 - - 1.67e-04 4.39e-05 66.030 57
CPL 1.971 0.000 2.1 0.0 3.50e-04 0.00e+00 66.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.521 0.366 - - 1.67e-04 4.39e-05 66.030 57
CPL 1.971 0.000 2.1 0.0 3.50e-04 0.00e+00 66.790 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 1344.000 0.000 1344.000
T90 1344.000 0.000 1344.000
T50 1344.000 0.000 1344.000
Peak 1344.000 0.000 1344.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.1530 -20.3625 0.0502 14.6 30.0 2.2703 3.8 TRIG_00631946
------------------------------------------
Foreground time interval of the image:
150.000 963.096 (delta_t = 813.095 [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 150.000 sec. to 963.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52070 ( -0.338519 0.394288 )
Norm@50keV : 1.66785E-04 ( -4.4538e-05 4.32097e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.929975e-01
Photon flux (15-150 keV) in 813.1 sec: 3.31841E-02 ( -0.00488683 0.0048871 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36376e-06 ( -2.51837e-07 2.63857e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 150.000 sec. to 963.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97088 ( )
Epeak [keV] : 2.13842 ( )
Norm@50keV : 3.50077E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.79 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 56 degrees of freedom
# Null hypothesis probability = 1.531972e-01
Photon flux (15-150 keV) in 813.1 sec: 3.31854E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36298e-06 ( -2.63574e-07 2.5881e-07 ) ergs/cm2
Band function
Time interval is from 150.000 sec. to 963.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.59510 ( 7.55535 2.5951 )
beta : -2.52071 ( -0.394232 0.338479 )
Epeak [keV] : 63.5166 ( -63.5166 -63.5166 )
Norm@50keV : 2.26683E-02 ( -0.00605322 0.005873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 55 degrees of freedom
# Null hypothesis probability = 1.464887e-01
Photon flux (15-150 keV) in 813.1 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] : 7.59839 (-1.51103 1.75667)
R^2/D10^2 : 4.20569E-02 (-0.0238052 0.06376)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.36 using 59 PHA bins.
# Reduced chi-squared = 1.410 for 57 degrees of freedom
# Null hypothesis probability = 2.245703e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.427e-07 9.542e-08
25- 50 5.474e-07 1.483e-07
50-150 1.210e-07 6.247e-08
15-150 1.011e-06 2.493e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.8888 (-11.2262 18.8323)
Norm : 0.236382 (-0.068146 0.110135)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.47 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 57 degrees of freedom
# Null hypothesis probability = 1.420695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.142e-07 7.972e-08
25- 50 5.046e-07 1.050e-07
50-150 3.224e-07 1.605e-07
15-150 1.241e-06 2.960e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.55715 (-1.20968 1.68423)
R1^2/D10^2 : 5.78666 (-5.68722 1259.06)
kT2 [keV] : 11.4221 (-2.84201 4.86618)
R2^2/D10^2 : 6.63946E-03 (-0.00531198 0.0219863)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.32 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 55 degrees of freedom
# Null hypothesis probability = 1.826673e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.518e-07 2.256e-07
25- 50 4.637e-07 2.471e-07
50-150 3.329e-07 2.097e-07
15-150 1.248e-06 6.497e-07
Peak spectrum fit
Power-law model
Time interval is from 150.000 sec. to 963.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52070 ( -0.338519 0.394288 )
Norm@50keV : 1.66785E-04 ( -4.4538e-05 4.32097e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.929975e-01
Photon flux (15-150 keV) in 813.1 sec: 3.31841E-02 ( -0.00488683 0.0048871 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36376e-06 ( -2.51837e-07 2.63857e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 150.000 sec. to 963.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97088 ( )
Epeak [keV] : 2.13842 ( )
Norm@50keV : 3.50077E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.79 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 56 degrees of freedom
# Null hypothesis probability = 1.531972e-01
Photon flux (15-150 keV) in 813.1 sec: 3.31854E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36298e-06 ( -2.63574e-07 2.5881e-07 ) ergs/cm2
Band function
Time interval is from 150.000 sec. to 963.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.59510 ( 7.55535 2.5951 )
beta : -2.52071 ( -0.394232 0.338479 )
Epeak [keV] : 63.5166 ( -63.5166 -63.5166 )
Norm@50keV : 2.26683E-02 ( -0.00605322 0.005873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 55 degrees of freedom
# Null hypothesis probability = 1.464887e-01
Photon flux (15-150 keV) in 813.1 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] : 7.59839 (-1.51103 1.75667)
R^2/D10^2 : 4.20569E-02 (-0.0238052 0.06376)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.36 using 59 PHA bins.
# Reduced chi-squared = 1.410 for 57 degrees of freedom
# Null hypothesis probability = 2.245703e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.427e-07 9.005e-08
25- 50 5.474e-07 1.598e-07
50-150 1.210e-07 5.914e-08
15-150 1.011e-06 2.395e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.8888 (-11.2262 18.8323)
Norm : 0.236382 (-0.068146 0.110135)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.47 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 57 degrees of freedom
# Null hypothesis probability = 1.420695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.142e-07 8.342e-08
25- 50 5.046e-07 1.103e-07
50-150 3.224e-07 1.673e-07
15-150 1.241e-06 2.870e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.55715 (-1.20968 1.68423)
R1^2/D10^2 : 5.78666 (-5.68722 1259.06)
kT2 [keV] : 11.4221 (-2.84201 4.86618)
R2^2/D10^2 : 6.63946E-03 (-0.00531198 0.0219863)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.32 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 55 degrees of freedom
# Null hypothesis probability = 1.826673e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.518e-07 2.367e-07
25- 50 4.637e-07 2.521e-07
50-150 3.329e-07 2.086e-07
15-150 1.248e-06 5.416e-07
Plot creation:
Sun Feb 22 05:29:44 EST 2015