batgrbproduct Analysis for Trigger=568855
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 Sep 1 10:20:44 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger568855/batgroup_hand_proc
======================================================================
Trigger: 00568855 Segment: 000
BAT Trigger Time: 399649710.656 [s; MET]
Trigger Stop: 399649712.704 [s; MET]
UTC: 2013-08-31T13:48:19.679500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 192.445770104134 Dec: -29.176729615974 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.44
Image Trigger?: NO
Rate S/N Ratio: 10.6301458127346 [ if not an image trigger ]
Image S/N Ratio: 7.44
Flight Position: [ source = BAT ]
RA: 192.445770104134 Dec: -29.176729615974 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 192.453778363335 Dec: -29.1870964515425 [deg; J2000]
{ 12h 49m 48.9s , -29d 11' 13.5" }
+/- 2.05964664893651 [arcmin] (estimated 90% radius based on SNR)
+/- 0.742248997047377 [arcmin] (formal 1-sigma fit error)
SNR: 10.8353530424634
Angular difference between Flight and Ground position is 0.750256 arcmin
Partial Coding Fraction: 0.1484375 [ including projection effects ]
Duration
T90: 37.7760000228882 +/- 10.3630852590037
Measured from: -11.3360000252724
to: 26.4399999976158 [s; relative to TRIGTIME]
T50: 7.74400007724762 +/- 9.35677205323313
Measured from: -2.90400004386902
to: 4.8400000333786 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0520000457763672
to: 0.947999954223633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -13.9120000004768
to: 30.5519999861717 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.583732 0.948850 0.472130 0.087431
0.093282 0.092502 0.082183 0.069123 [error]
Peak 0.069661 0.105281 0.059584 0.035882
0.015239 0.015741 0.015195 0.011861 [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 2.77e-07 4.04e-07 4.40e-07 8.96e-07 1.40e-06 2.02e-06 erg/cm2
Error 5.20e-08 5.05e-08 8.00e-08 3.27e-07 1.92e-07 4.08e-07 erg/cm2
Peak flux Power-law 9.76e-01 8.01e-01 4.45e-01 3.65e-01 2.38e+00 2.59e+00 ph/cm2/s
Error 2.79e-01 1.52e-01 1.20e-01 1.89e-01 4.54e-01 4.85e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 9.04e-01 8.54e-01 4.60e-01 1.91e-01 2.34e+00 2.41e+00 ph/cm2/s
Error 3.19e-01 1.97e-01 1.37e-01 2.24e-01 4.65e-01 5.56e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.877 0.213 - - 3.41e-03 4.70e-04 40.880 57
CPL 0.484 1.330 49.3 17.1 1.94e-02 6.72e-02 36.090 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.846 0.327 - - 1.70e-02 3.56e-03 68.420 57
CPL 1.276 1.337 58.8 0.0 3.46e-02 0.00e+00 67.850 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: 2.304000 sec.
T50 in the 50-300 keV band: 1.344000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 44.464 -13.912 30.552
T90 37.776 -11.336 26.440
T50 7.744 -2.904 4.840
Peak 1.000 -0.052 0.948
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
192.4538 -29.1871 0.0178 49.8570 -144.6286 2.0191101 10.835 TRIG_00568855
Foreground time interval of the image:
-13.912 26.845 (delta_t = 40.757 [sec])
Background time interval of the image:
-239.656 -13.912 (delta_t = 225.744 [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 -13.912 sec. to 30.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87747 ( -0.208414 0.218504 )
Norm@50keV : 3.41427E-03 ( -0.000473785 0.000466199 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.88 using 59 PHA bins.
# Reduced chi-squared = 0.7173 for 57 degrees of freedom
# Null hypothesis probability = 9.470447e-01
Photon flux (15-150 keV) in 44.46 sec: 0.485362 ( -0.061927 0.0620827 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39548e-06 ( -1.90889e-07 1.92983e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.912 sec. to 30.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.483903 ( -1.54392 1.11554 )
Epeak [keV] : 49.2532 ( -9.41121 24.7403 )
Norm@50keV : 1.93923E-02 ( -0.0194143 0.115043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.09 using 59 PHA bins.
# Reduced chi-squared = 0.6444 for 56 degrees of freedom
# Null hypothesis probability = 9.822051e-01
Photon flux (15-150 keV) in 44.46 sec: 0.459802 ( -0.065715 0.06559 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -13.912 sec. to 30.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 8.01229E-02 ( -1.52918 2.97544 )
beta : -2.66713 ( 2.67651 0.671409 )
Epeak [keV] : 44.4591 ( -11.3283 20.1242 )
Norm@50keV : 4.28773E-02 ( -0.0467382 1.9404 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.20 using 59 PHA bins.
# Reduced chi-squared = 0.6400 for 55 degrees of freedom
# Null hypothesis probability = 9.826932e-01
Photon flux (15-150 keV) in 44.46 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] : 11.6653 (-1.40484 1.59862)
R^2/D10^2 : 0.133159 (-0.051667 0.08303)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.40 using 59 PHA bins.
# Reduced chi-squared = 0.7088 for 57 degrees of freedom
# Null hypothesis probability = 9.529229e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.699e-07 3.977e-08
25- 50 5.170e-07 8.676e-08
50-150 4.149e-07 1.074e-07
15-150 1.102e-06 1.903e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 84.5347 (-26.2354 49.8082)
Norm : 2.26318 (-0.390273 0.47885)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.41 using 59 PHA bins.
# Reduced chi-squared = 0.6564 for 57 degrees of freedom
# Null hypothesis probability = 9.791152e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.619e-07 4.584e-08
25- 50 4.368e-07 5.431e-08
50-150 6.394e-07 2.813e-07
15-150 1.338e-06 3.090e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.91832 ( )
R1^2/D10^2 : 0.214829 (-0.125653 923.663)
kT2 [keV] : 42.2814 (-44.1786 -44.1788)
R2^2/D10^2 : 5.21059E-04 (-0.00039736 0.129224)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.13 using 59 PHA bins.
#Fit statistic : Chi-Squared = 35.41 using 59 PHA bins.
# Reduced chi-squared = 0.6750 for 55 degrees of freedom
# Reduced chi-squared = 0.6438 for 55 degrees of freedom
# Null hypothesis probability = 9.691859e-01
# Null hypothesis probability = 9.814892e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.292e-07 8.801e-08
25- 50 4.751e-07 1.740e-07
50-150 4.725e-07 1.637e-07
15-150 1.177e-06 3.332e-07
Peak spectrum fit
Power-law model
Time interval is from -0.052 sec. to 0.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84620 ( -0.313548 0.340121 )
Norm@50keV : 1.69829E-02 ( -0.00361429 0.00350872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.42 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.429755e-01
Photon flux (15-150 keV) in 1 sec: 2.38346 ( -0.453959 0.454902 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56162e-07 ( -3.26775e-08 3.3201e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.052 sec. to 0.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27640 ( -1.79902 0.875691 )
Epeak [keV] : 58.8035 ( )
Norm@50keV : 3.45688E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.85 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 56 degrees of freedom
# Null hypothesis probability = 1.332447e-01
Photon flux (15-150 keV) in 1 sec: 2.34137 ( -0.46537 0.46449 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50525e-07 ( -3.6712e-08 1.8609e-08 ) ergs/cm2
Band function
Time interval is from -0.052 sec. to 0.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.70391 ( -4.70391 -4.70391 )
beta : -2.17253 ( -0.637248 0.453278 )
Epeak [keV] : 29.3312 ( -8.07259 6.57996 )
Norm@50keV : 570.330 ( -105.656 1.87262e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.86 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 55 degrees of freedom
# Null hypothesis probability = 1.311398e-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] : 11.0311 (-2.35517 3.06268)
R^2/D10^2 : 0.784333 (-0.470795 1.14591)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.06 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.446818e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.995e-08 6.400e-09
25- 50 5.662e-08 1.745e-08
50-150 3.901e-08 1.777e-08
15-150 1.156e-07 3.672e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 93.3569 (-42.42 -93.3564)
Norm : 10.7691 (-2.4513 3.62327)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.83 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 57 degrees of freedom
# Null hypothesis probability = 1.544499e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.812e-08 7.170e-09
25- 50 4.795e-08 1.578e-08
50-150 7.465e-08 5.158e-08
15-150 1.507e-07 5.545e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.91770 (-3.47458 3.10529)
R1^2/D10^2 : 2.17903 ( )
kT2 [keV] : 30.9138 (-16.7794 -30.9327)
R2^2/D10^2 : 1.04823E-02 (-0.0102395 0.234293)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.22 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.94 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 55 degrees of freedom
# Reduced chi-squared = 1.217 for 55 degrees of freedom
# Null hypothesis probability = 1.249329e-01
# Null hypothesis probability = 1.296707e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.637e-08 1.543e-08
25- 50 4.917e-08 2.725e-08
50-150 6.763e-08 4.120e-08
15-150 1.432e-07 7.880e-08
Plot creation:
Sun Sep 1 11:40:50 EDT 2013