batgrbproduct Analysis for Trigger=421386
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon May 10 16:13:38 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger421386/SDC
======================================================================
Trigger: 00421386 Segment: 000
BAT Trigger Time: 295003248 [s; MET]
Trigger Stop: 295003312 [s; MET]
UTC: 2010-05-08T09:20:42.221700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 76.2500038130658 Dec: -20.7209133097938 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.47
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.47
Flight Position: [ source = BAT ]
RA: 76.2500038130658 Dec: -20.7209133097938 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 76.2640974545741 Dec: -20.7411182486438 [deg; J2000]
{ 05h 05m 03.4s , -20d 44' 28.0" }
+/- 2.02337854671835 [arcmin] (estimated 90% radius based on SNR)
+/- 1.33052896918651 [arcmin] (formal 1-sigma fit error)
SNR: 11.1138702287493
Angular difference between Flight and Ground position is 1.447457 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 57.0239999890327 +/- 9.36796347981867
Measured from: -3.63200002908707
to: 53.3919999599457 [s; relative to TRIGTIME]
T50: 22.5559999346733 +/- 10.4877164652394
Measured from: 12.3759999871254
to: 34.9319999217987 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 30.6000000238419
to: 31.6000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.95999997854233
to: 59.0199999809265 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.192495 0.470799 0.354962 0.151749
0.052642 0.052902 0.048190 0.044392 [error]
Peak 0.012347 0.018655 0.022130 0.003376
0.006285 0.006317 0.005884 0.005440 [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 7.48e-08 1.66e-07 2.90e-07 1.18e-06 7.92e-07 1.71e-06 erg/cm2
Error 1.96e-08 2.63e-08 4.52e-08 4.16e-07 1.16e-07 4.41e-07 erg/cm2
Peak flux Power-law 1.23e-01 1.52e-01 1.36e-01 2.12e-01 4.84e-01 6.24e-01 ph/cm2/s
Error 7.75e-02 5.80e-02 4.62e-02 1.66e-01 1.54e-01 1.98e-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 1.24e-01 1.53e-01 1.36e-01 2.08e-01 4.85e-01 6.21e-01 ph/cm2/s
Error 7.75e-02 5.79e-02 5.15e-02 2.09e-01 1.51e-01 2.34e-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 1.195 0.235 - - 1.16e-03 1.57e-04 54.830 57
CPL 0.747 0.894 147.8 0.0 1.92e-03 0.00e+00 54.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.154 0.586 - - 4.15e-03 1.26e-03 55.290 57
CPL 1.154 1.269 9999.4 0.0 4.17e-03 1.94e-02 55.290 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: 30.912000 sec.
T50 in the 50-300 keV band: 19.264000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 66.980 -7.960 59.020
T90 57.024 -3.632 53.392
T50 22.556 12.376 34.932
Peak 1.000 30.600 31.600
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
76.2641 -20.7411 0.0173 34.1 -4.7 1.2055 11.1 TRIG_00421386
------------------------------------------
Foreground time interval of the image:
-7.960 59.020 (delta_t = 66.980 [sec])
Background time interval of the image:
-239.000 -7.960 (delta_t = 231.040 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 -7.960 sec. to 59.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19498 ( -0.238576 0.23081 )
Norm@50keV : 1.16344E-03 ( -0.000157536 0.000157301 )
------------------------------------------------------------
# Chi-Squared = 54.83 using 59 PHA bins.
# Reduced chi-squared = 0.9618 for 57 degrees of freedom
# Null hypothesis probability = 5.571119e-01
Photon flux (15-150 keV) in 66.98 sec: 0.136468 ( -0.0192279 0.0193097 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.91717e-07 ( -1.15282e-07 1.16259e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.960 sec. to 59.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.746549 ( -1.14169 0.646501 )
Epeak [keV] : 147.805 ( -147.805 -147.805 )
Norm@50keV : 1.91606E-03 ( )
------------------------------------------------------------
# Chi-Squared = 54.16 using 59 PHA bins.
# Reduced chi-squared = 0.9672 for 56 degrees of freedom
# Null hypothesis probability = 5.446334e-01
Photon flux (15-150 keV) in 66.98 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -7.960 sec. to 59.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98572 ( -145.699 -135.699 )
beta : -1.38743 ( -0.202636 0.290769 )
Epeak [keV] : 31.9589 ( -9.79549 9.05121 )
Norm@50keV : 22.6245 ( -17.4045 23.7863 )
------------------------------------------------------------
# Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9397 for 55 degrees of freedom
# Null hypothesis probability = 6.021056e-01
Photon flux (15-150 keV) in 66.98 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] : 18.0042 (-2.89985 3.75323)
R^2/D10^2 : 8.89766E-03 (-0.00419053 0.00727012)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 62.22 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.956866e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.868e-08 1.141e-08
25- 50 1.789e-07 4.551e-08
50-150 4.210e-07 1.091e-07
15-150 6.385e-07 1.281e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 0.572227 (-0.572227 -0.572227)
------------------------------------------------------------
# Chi-Squared = 60.59 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.477529e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.545e-08 5.134e-08
25- 50 1.836e-07 9.967e-08
50-150 4.027e-07 2.183e-07
15-150 6.817e-07 3.667e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.2625 (-4.54325 4.18186)
R1^2/D10^2 : 3.15622E-02 (-0.0196055 0.0973488)
kT2 [keV] : 60.8732 (-27.3899 -60.8738)
R2^2/D10^2 : 1.62641E-04 (-0.00015025 0.00282157)
------------------------------------------------------------
# Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9519 for 55 degrees of freedom
# Null hypothesis probability = 5.763014e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.004e-08 3.480e-08
25- 50 1.923e-07 1.047e-07
50-150 5.312e-07 3.016e-07
15-150 7.835e-07 4.025e-07
Peak spectrum fit
Power-law model
Time interval is from 30.600 sec. to 31.600 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15431 ( -0.604869 0.566183 )
Norm@50keV : 4.15163E-03 ( -0.00126593 0.00125436 )
------------------------------------------------------------
# Chi-Squared = 55.29 using 59 PHA bins.
# Reduced chi-squared = 0.9700 for 57 degrees of freedom
# Null hypothesis probability = 5.393858e-01
Photon flux (15-150 keV) in 1 sec: 0.484418 ( -0.153138 0.154574 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.26849e-08 ( -1.38362e-08 1.40113e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.600 sec. to 31.600 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15408 ( -1.97324 0.565437 )
Epeak [keV] : 9999.36 ( -9997.47 -9997.47 )
Norm@50keV : 4.17370E-03 ( -0.00125418 0.0374549 )
------------------------------------------------------------
# Chi-Squared = 55.29 using 59 PHA bins.
# Reduced chi-squared = 0.9874 for 56 degrees of freedom
# Null hypothesis probability = 5.015364e-01
Photon flux (15-150 keV) in 1 sec: 0.485180 ( -0.15406 0.148808 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.26963e-08 ( -1.38419e-08 1.40197e-08 ) ergs/cm2
Band function
Time interval is from 30.600 sec. to 31.600 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.947159 ( 0.947159 0.947159 )
beta : -1.15425 ( 1.15425 0.604969 )
Epeak [keV] : 47.9547 ( -47.9547 -47.9547 )
Norm@50keV : 7.21373E-03 ( -0.00721373 8633.09 )
------------------------------------------------------------
# Chi-Squared = 55.29 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 55 degrees of freedom
# Null hypothesis probability = 4.635701e-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] : 22.3517 (-7.89289 15.2833)
R^2/D10^2 : 1.55505E-02 (-0.0155212 0.0485154)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 58.00 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.381066e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.427e-09 9.450e-10
25- 50 7.618e-09 4.720e-09
50-150 2.844e-08 1.738e-08
15-150 3.749e-08 2.362e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.986 -199.986)
Norm : 2.02696 (-0.626823 0.626851)
------------------------------------------------------------
# Chi-Squared = 56.98 using 59 PHA bins.
# Reduced chi-squared = 0.9997 for 57 degrees of freedom
# Null hypothesis probability = 4.757075e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.047e-09 3.203e-09
25- 50 9.709e-09 5.985e-09
50-150 2.129e-08 1.292e-08
15-150 3.605e-08 2.129e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.32779 (-3.34985 48.6978)
R1^2/D10^2 : 9.85353 (-9.26399 -9.26399)
kT2 [keV] : 26.3401 (-10.0727 -26.4199)
R2^2/D10^2 : 8.79454E-03 (-0.00868785 0.0103642)
------------------------------------------------------------
# Chi-Squared = 55.30 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 55 degrees of freedom
# Null hypothesis probability = 4.633470e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.441e-09 2.507e-09
25- 50 6.702e-09 3.854e-09
50-150 3.058e-08 1.929e-08
15-150 4.172e-08 2.422e-08
Plot creation:
Mon May 10 16:41:09 EDT 2010