batgrbproduct Analysis for Trigger=541371
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): Wed Dec 12 14:03:56 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger541371/GCN5_download_cron
======================================================================
Trigger: 00541371 Segment: 000
BAT Trigger Time: 376988183.36 [s; MET]
Trigger Stop: 376988184.384 [s; MET]
UTC: 2012-12-12T06:56:13.384600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 177.840777609451 Dec: 78.0344305601871 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.64
Image Trigger?: NO
Rate S/N Ratio: 13.3416640641263 [ if not an image trigger ]
Image S/N Ratio: 7.64
Flight Position: [ source = BAT ]
RA: 177.840777609451 Dec: 78.0344305601871 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 177.770953616623 Dec: 78.0464151563514 [deg; J2000]
{ 11h 51m 05.0s , +78d 02' 47.1" }
+/- 2.03319558300607 [arcmin] (estimated 90% radius based on SNR)
+/- 0.763933618276537 [arcmin] (formal 1-sigma fit error)
SNR: 11.0372896702557
Angular difference between Flight and Ground position is 1.127271 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 6.05599993467331 +/- 1.37556533919639
Measured from: 0.052000105381012
to: 6.10800004005432 [s; relative to TRIGTIME]
T50: 3.70799994468689 +/- 0.906368594438306
Measured from: 0.488000094890594
to: 4.19600003957748 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.015999972820282
to: 1.01599997282028 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.48400002717972
to: 6.62799996137619 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.172858 0.089215 0.060781 0.010106
0.015777 0.015946 0.013776 0.012165 [error]
Peak 0.038486 0.037591 0.015657 0.004676
0.005762 0.005937 0.005072 0.004325 [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 4.59e-08 4.61e-08 3.26e-08 3.65e-08 1.39e-07 1.61e-07 erg/cm2
Error 8.18e-09 8.01e-09 1.25e-08 2.70e-08 2.73e-08 4.39e-08 erg/cm2
Peak flux Power-law 3.42e-01 2.49e-01 1.21e-01 8.27e-02 7.51e-01 7.94e-01 ph/cm2/s
Error 8.21e-02 4.52e-02 4.03e-02 5.23e-02 1.32e-01 1.45e-01 ph/cm2/s
Fluence Cutoff-PL 4.59e-08 4.62e-08 3.26e-08 3.62e-08 1.61e-07 0.00e+00 erg/cm2
Error 8.16e-09 8.00e-09 1.25e-08 2.78e-08 4.36e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.45e-01 2.49e-01 1.19e-01 7.91e-02 7.50e-01 7.91e-01 ph/cm2/s
Error 6.19e-02 5.49e-02 3.22e-02 7.21e-02 1.33e-01 1.41e-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 2.502 0.376 - - 1.71e-03 4.72e-04 55.780 57
CPL 1.984 0.000 1.5 11.7 3.24e-03 0.00e+00 58.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.047 0.360 - - 4.90e-03 1.23e-03 81.930 57
CPL 1.996 0.000 4.0 0.0 5.23e-03 0.00e+00 81.940 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 8.112 -1.484 6.628
T90 6.056 0.052 6.108
T50 3.708 0.488 4.196
Peak 1.000 0.016 1.016
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
177.7710 +78.0464 0.0173 11.4 -129.3 0.3369 11.0 TRIG_00541371
------------------------------------------
Foreground time interval of the image:
-1.484 6.628 (delta_t = 8.112 [sec])
Background time interval of the image:
-239.360 -48.251 (delta_t = 191.109 [sec])
-47.360 -1.484 (delta_t = 45.876 [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 -1.484 sec. to 6.628 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50175 ( -0.349357 0.403628 )
Norm@50keV : 1.71262E-03 ( -0.000475857 0.000468525 )
------------------------------------------------------------
# Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 0.9786 for 57 degrees of freedom
# Null hypothesis probability = 5.209274e-01
Photon flux (15-150 keV) in 8.112 sec: 0.336795 ( -0.0463098 0.0463346 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38983e-07 ( -2.63896e-08 2.81945e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.484 sec. to 6.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98420 ( )
Epeak [keV] : 1.45961 ( -0.876679 22.5878 )
Norm@50keV : 3.23668E-03 ( )
------------------------------------------------------------
# Chi-Squared = 58.60 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 56 degrees of freedom
# Null hypothesis probability = 3.802715e-01
Photon flux (15-150 keV) in 8.112 sec: 0.336600 ( -0.046244 0.046361 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60804e-07 ( -3.82173e-08 4.89381e-08 ) ergs/cm2
Band function
Time interval is from -1.484 sec. to 6.628 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.70265 ( 1.70267 1.70267 )
beta : -2.50146 ( -0.376377 0.349175 )
Epeak [keV] : 3.91399 ( -3.91415 9996.08 )
Norm@50keV : 1.32307E-02 ( -0.0132323 1.779e+06 )
------------------------------------------------------------
# Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.452898e-01
Photon flux (15-150 keV) in 8.112 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] : 5.40708 (-0.96852 1.27511)
R^2/D10^2 : 1.79017 (-1.07703 2.67596)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 74.32 using 59 PHA bins.
# Reduced chi-squared = 1.304 for 57 degrees of freedom
# Null hypothesis probability = 6.145434e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.782e-08 1.475e-08
25- 50 3.770e-08 1.160e-08
50-150 2.208e-09 1.426e-09
15-150 8.772e-08 2.483e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.8127 (-11.3884 21.8622)
Norm : 2.63557 (-0.871215 1.6521)
------------------------------------------------------------
# Chi-Squared = 62.60 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 57 degrees of freedom
# Null hypothesis probability = 2.843083e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.337e-08 8.189e-09
25- 50 4.939e-08 1.117e-08
50-150 2.683e-08 1.317e-08
15-150 1.196e-07 2.531e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.09396 (-0.836926 0.984938)
R1^2/D10^2 : 5.70737 (-3.61347 17.3881)
kT2 [keV] : 24.3445 (-9.12031 26.6188)
R2^2/D10^2 : 3.62753E-03 (-0.00318611 0.0149046)
------------------------------------------------------------
# Chi-Squared = 51.24 using 59 PHA bins.
# Reduced chi-squared = 0.9316 for 55 degrees of freedom
# Null hypothesis probability = 6.191871e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.014e-08 2.654e-08
25- 50 3.534e-08 1.325e-08
50-150 7.605e-08 4.459e-08
15-150 1.615e-07 7.455e-08
Peak spectrum fit
Power-law model
Time interval is from 0.016 sec. to 1.016 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04722 ( -0.339585 0.380775 )
Norm@50keV : 4.89597E-03 ( -0.00125636 0.00120351 )
------------------------------------------------------------
# Chi-Squared = 81.93 using 59 PHA bins.
# Reduced chi-squared = 1.437 for 57 degrees of freedom
# Null hypothesis probability = 1.691572e-02
Photon flux (15-150 keV) in 1 sec: 0.750804 ( -0.13244 0.132468 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.52848e-08 ( -1.02649e-08 1.08056e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 1.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99557 ( )
Epeak [keV] : 4.02709 ( )
Norm@50keV : 5.23185E-03 ( )
------------------------------------------------------------
# Chi-Squared = 81.94 using 59 PHA bins.
# Reduced chi-squared = 1.463 for 56 degrees of freedom
# Null hypothesis probability = 1.349503e-02
Photon flux (15-150 keV) in 1 sec: 0.749994 ( -0.132262 0.132969 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.04679e-08 ( -1.82086e-08 2.37115e-08 ) ergs/cm2
Band function
Time interval is from 0.016 sec. to 1.016 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.21795 ( -2.11566 -2.11566 )
beta : -2.12126 ( -1.67885 0.395857 )
Epeak [keV] : 20.4191 ( -20.2799 61.7905 )
Norm@50keV : 16.0538 ( -17.4236 1397.3 )
------------------------------------------------------------
# Chi-Squared = 81.71 using 59 PHA bins.
# Reduced chi-squared = 1.486 for 55 degrees of freedom
# Null hypothesis probability = 1.119265e-02
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] : 8.71114 (-1.64494 1.99196)
R^2/D10^2 : 0.595395 (-0.328224 0.747225)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 87.67 using 59 PHA bins.
# Reduced chi-squared = 1.538 for 57 degrees of freedom
# Null hypothesis probability = 5.606537e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.641e-09 2.834e-09
25- 50 1.744e-08 4.745e-09
50-150 6.015e-09 2.947e-09
15-150 3.210e-08 9.530e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.1229 (-23.7515 60.0044)
Norm : 4.05473 (-1.10749 1.63671)
------------------------------------------------------------
# Chi-Squared = 82.48 using 59 PHA bins.
# Reduced chi-squared = 1.447 for 57 degrees of freedom
# Null hypothesis probability = 1.529478e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.007e-08 2.315e-09
25- 50 1.501e-08 4.077e-09
50-150 1.613e-08 9.046e-09
15-150 4.122e-08 1.401e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.54462 ( )
R1^2/D10^2 : 0.960545 (-0.546238 0.817823)
kT2 [keV] : 99.6647 (-100.19 -100.19)
R2^2/D10^2 : 2.05325E-04 (-0.000143562 0.411828)
------------------------------------------------------------
# Chi-Squared = 83.35 using 59 PHA bins.
# Chi-Squared = 81.86 using 59 PHA bins.
# Reduced chi-squared = 1.516 for 55 degrees of freedom
# Reduced chi-squared = 1.488 for 55 degrees of freedom
# Null hypothesis probability = 8.115839e-03
# Null hypothesis probability = 1.087534e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.035e-08 5.225e-09
25- 50 1.487e-08 8.005e-09
50-150 1.152e-08 7.520e-09
15-150 3.675e-08 1.874e-08
Plot creation:
Wed Dec 12 14:30:13 EST 2012