batgrbproduct Analysis for Trigger=624606
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 11 14:31:38 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger624606/GCN5_download_cron
======================================================================
Trigger: 00624606 Segment: 000
BAT Trigger Time: 442620523.072 [s; MET]
Trigger Stop: 442620524.096 [s; MET]
UTC: 2015-01-10T22:08:30.037560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 289.359743492699 Dec: 32.5222624222269 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.76
Image Trigger?: NO
Rate S/N Ratio: 15.4272486205415 [ if not an image trigger ]
Image S/N Ratio: 10.76
Flight Position: [ source = BAT ]
RA: 289.359743492699 Dec: 32.5222624222269 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 289.373057499747 Dec: 32.528908670621 [deg; J2000]
{ 19h 17m 29.5s , +32d 31' 44.1" }
+/- 1.22767827477209 [arcmin] (estimated 90% radius based on SNR)
+/- 0.497801233743322 [arcmin] (formal 1-sigma fit error)
SNR: 22.6910560076557
Angular difference between Flight and Ground position is 0.782740 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 10.5919999480247 +/- 0.945126467692156
Measured from: -7.25199991464615
to: 3.3400000333786 [s; relative to TRIGTIME]
T50: 6.39599996805191 +/- 1.40137646462386
Measured from: -4.15599989891052
to: 2.24000006914139 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.99599999189377
to: 2.99599999189377 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.93999999761581
to: 3.77199995517731 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.319675 0.370995 0.203899 0.045080
0.022234 0.022605 0.018956 0.015155 [error]
Peak 0.043140 0.068660 0.045517 0.025236
0.006657 0.007234 0.006357 0.004902 [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 9.79e-08 1.43e-07 1.55e-07 3.13e-07 4.91e-07 7.08e-07 erg/cm2
Error 1.05e-08 1.02e-08 1.80e-08 7.35e-08 4.15e-08 9.15e-08 erg/cm2
Peak flux Power-law 4.19e-01 4.50e-01 3.43e-01 4.26e-01 1.37e+00 1.64e+00 ph/cm2/s
Error 8.41e-02 5.57e-02 5.09e-02 1.31e-01 1.60e-01 1.99e-01 ph/cm2/s
Fluence Cutoff-PL 9.20e-08 1.52e-07 1.53e-07 1.21e-07 4.63e-07 5.18e-07 erg/cm2
Error 1.20e-08 1.37e-08 2.01e-08 1.16e-07 4.81e-08 1.27e-07 erg/cm2
Peak flux Cutoff-PL 4.22e-01 4.50e-01 3.42e-01 4.19e-01 1.37e+00 1.63e+00 ph/cm2/s
Error 8.41e-02 5.97e-02 5.16e-02 -------- 1.60e-01 2.44e-01 ph/cm2/s
Fluence Band 9.08e-08 1.52e-07 1.50e-07 1.75e-07 4.64e-07 5.70e-07 erg/cm2
Error -------- -------- 2.35e-08 -------- -------- -------- 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 1.883 0.133 - - 4.57e-03 3.86e-04 49.040 57
CPL 1.294 0.584 52.1 46.1 9.76e-03 8.40e-03 45.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.392 0.203 - - 1.13e-02 1.34e-03 44.250 57
CPL 1.361 0.000 991.3 0.0 1.17e-02 0.00e+00 44.300 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: 2.176000 sec.
T50 in the 50-300 keV band: 1.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 11.712 -7.940 3.772
T90 10.592 -7.252 3.340
T50 6.396 -4.156 2.240
Peak 1.000 1.996 2.996
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
289.3731 +32.5289 0.0085 13.0 25.8 0.9323 22.7 TRIG_00624606
------------------------------------------
Foreground time interval of the image:
-7.940 3.772 (delta_t = 11.712 [sec])
Background time interval of the image:
-239.072 -7.940 (delta_t = 231.132 [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 -7.940 sec. to 3.772 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88279 ( -0.131424 0.135379 )
Norm@50keV : 4.56511E-03 ( -0.00038853 0.000383118 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.04 using 59 PHA bins.
# Reduced chi-squared = 0.8604 for 57 degrees of freedom
# Null hypothesis probability = 7.641692e-01
Photon flux (15-150 keV) in 11.71 sec: 0.650407 ( -0.0468698 0.0468971 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91432e-07 ( -4.12059e-08 4.1733e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.940 sec. to 3.772 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29383 ( -0.624507 0.542507 )
Epeak [keV] : 52.0802 ( -11.4939 80.6874 )
Norm@50keV : 9.75555E-03 ( -0.00482569 0.0119689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.8138 for 56 degrees of freedom
# Null hypothesis probability = 8.388451e-01
Photon flux (15-150 keV) in 11.71 sec: 0.633353 ( -0.049281 0.04929 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.63057e-07 ( -4.74407e-08 4.87429e-08 ) ergs/cm2
Band function
Time interval is from -7.940 sec. to 3.772 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29384 ( 1.38705 0.346919 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 52.0701 ( -11.2898 80.4998 )
Norm@50keV : 9.75421E-03 ( -0.000693521 0.0119986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.8286 for 55 degrees of freedom
# Null hypothesis probability = 8.135944e-01
Photon flux (15-150 keV) in 11.71 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64131e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8084 (-0.935365 1.03347)
R^2/D10^2 : 0.225572 (-0.0658399 0.0923312)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.40 using 59 PHA bins.
# Reduced chi-squared = 1.411 for 57 degrees of freedom
# Null hypothesis probability = 2.228231e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.424e-08 8.226e-09
25- 50 1.775e-07 1.511e-08
50-150 1.156e-07 1.986e-08
15-150 3.573e-07 3.009e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.2333 (-18.0444 27.1804)
Norm : 3.02208 (-0.321333 0.373296)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.54 using 59 PHA bins.
# Reduced chi-squared = 0.7989 for 57 degrees of freedom
# Null hypothesis probability = 8.625230e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.198e-08 9.965e-09
25- 50 1.524e-07 1.153e-08
50-150 2.191e-07 7.436e-08
15-150 4.635e-07 7.108e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.13452 (-1.29517 1.4311)
R1^2/D10^2 : 1.26291 (-0.630143 1.6749)
kT2 [keV] : 19.7164 (-4.08039 7.61522)
R2^2/D10^2 : 1.65705E-02 (-0.0120243 0.0270927)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.79 using 59 PHA bins.
# Reduced chi-squared = 0.8143 for 55 degrees of freedom
# Null hypothesis probability = 8.356457e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.091e-08 3.490e-08
25- 50 1.520e-07 4.232e-08
50-150 2.155e-07 1.098e-07
15-150 4.583e-07 1.425e-07
Peak spectrum fit
Power-law model
Time interval is from 1.996 sec. to 2.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39167 ( -0.202177 0.203109 )
Norm@50keV : 1.12965E-02 ( -0.00134009 0.00133125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.25 using 59 PHA bins.
# Reduced chi-squared = 0.7764 for 57 degrees of freedom
# Null hypothesis probability = 8.911853e-01
Photon flux (15-150 keV) in 1 sec: 1.37313 ( -0.159607 0.159734 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09342e-07 ( -1.45704e-08 1.47498e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.996 sec. to 2.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36112 ( )
Epeak [keV] : 991.293 ( )
Norm@50keV : 1.17318E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.30 using 59 PHA bins.
# Reduced chi-squared = 0.7911 for 56 degrees of freedom
# Null hypothesis probability = 8.705600e-01
Photon flux (15-150 keV) in 1 sec: 1.37329 ( -0.16017 0.15926 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09295e-07 ( -1.52843e-08 1.4608e-08 ) ergs/cm2
Band function
Time interval is from 1.996 sec. to 2.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.67392 ( -4.67392 -4.67392 )
beta : -1.51940 ( -0.2633 0.241036 )
Epeak [keV] : 26.8898 ( -26.8898 5.78625 )
Norm@50keV : 421.039 ( -48.221 4.50094e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.78 using 59 PHA bins.
# Reduced chi-squared = 0.7779 for 55 degrees of freedom
# Null hypothesis probability = 8.848238e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0718e-07 ( -1.07173e-07 -1.50555e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3141 (-2.15512 2.6857)
R^2/D10^2 : 0.184345 (-0.0825186 0.141227)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.84 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.222134e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.960e-09 1.701e-09
25- 50 3.026e-08 5.235e-09
50-150 4.128e-08 1.055e-08
15-150 7.950e-08 1.294e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.60421 (-0.651185 0.651186)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.31 using 59 PHA bins.
# Reduced chi-squared = 0.8125 for 57 degrees of freedom
# Null hypothesis probability = 8.432495e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.402e-08 7.850e-09
25- 50 2.697e-08 1.480e-08
50-150 5.916e-08 3.260e-08
15-150 1.002e-07 5.490e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.0999 (-2.90163 2.18529)
R1^2/D10^2 : 0.526809 (-0.291005 0.514213)
kT2 [keV] : 198.460 ( )
R2^2/D10^2 : 2.07017E-04 (-6.7e-05 0.00893633)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.38 using 59 PHA bins.
#Fit statistic : Chi-Squared = 41.46 using 59 PHA bins.
# Reduced chi-squared = 0.7705 for 55 degrees of freedom
# Reduced chi-squared = 0.7539 for 55 degrees of freedom
# Null hypothesis probability = 8.934498e-01
# Null hypothesis probability = 9.114666e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.200e-08 5.324e-09
25- 50 2.841e-08 1.280e-08
50-150 6.709e-08 3.743e-08
15-150 1.075e-07 4.844e-08
Plot creation:
Sun Jan 11 14:35:08 EST 2015