batgrbproduct Analysis for Trigger=550906
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): Thu Mar 14 07:31:40 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger550906/GCN5_download_cron
======================================================================
Trigger: 00550906 Segment: 000
BAT Trigger Time: 384883701.376 [s; MET]
Trigger Stop: 384883701.504 [s; MET]
UTC: 2013-03-13T16:08:11.057240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 236.42303778442 Dec: -0.361783296507332 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.95
Image Trigger?: NO
Rate S/N Ratio: 12.9228479833201 [ if not an image trigger ]
Image S/N Ratio: 7.95
Flight Position: [ source = BAT ]
RA: 236.42303778442 Dec: -0.361783296507332 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 236.437668896008 Dec: -0.360646794772632 [deg; J2000]
{ 15h 45m 45.0s , -00d 21' 38.3" }
+/- 2.39182249317526 [arcmin] (estimated 90% radius based on SNR)
+/- 1.09537439064595 [arcmin] (formal 1-sigma fit error)
SNR: 8.75138981007932
Angular difference between Flight and Ground position is 0.880494 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 0.171999931335449 +/- 0.0357770801763245
Measured from: 0.020000159740448
to: 0.192000091075897 [s; relative to TRIGTIME]
T50: 0.0839999318122864 +/- 0.0393954323691675
Measured from: 0.0440001487731934
to: 0.12800008058548 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.38400000333786
to: 0.61599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0120000243186951
to: 0.216000020503998 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.015215 0.015742 0.015895 0.004808
0.003270 0.003082 0.002879 0.002173 [error]
Peak 0.015766 0.019609 0.018928 0.005257
0.006515 0.005974 0.005201 0.004324 [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 4.00e-09 7.32e-09 1.03e-08 3.04e-08 2.95e-08 5.20e-08 erg/cm2
Error 1.27e-09 1.43e-09 2.69e-09 1.73e-08 6.44e-09 1.94e-08 erg/cm2
Peak flux Power-law 1.31e-01 1.50e-01 1.23e-01 1.70e-01 4.67e-01 5.75e-01 ph/cm2/s
Error 7.11e-02 5.07e-02 4.16e-02 1.23e-01 1.41e-01 1.72e-01 ph/cm2/s
Fluence Cutoff-PL 3.90e-09 7.44e-09 1.04e-08 2.38e-08 2.92e-08 4.55e-08 erg/cm2
Error 1.44e-09 1.65e-09 2.87e-09 2.49e-08 6.86e-09 2.46e-08 erg/cm2
Peak flux Cutoff-PL 8.83e-02 1.59e-01 1.41e-01 5.62e-02 4.29e-01 4.45e-01 ph/cm2/s
Error 8.68e-02 6.24e-02 5.31e-02 1.24e-01 1.52e-01 2.12e-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 4.50e-01 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 1.508 0.345 - - 1.53e-02 3.00e-03 68.170 57
CPL 1.353 1.512 210.3 0.0 1.83e-02 5.07e-02 68.120 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.282 0.512 - - 3.92e-03 1.14e-03 49.150 57
CPL -0.209 3.129 81.9 -25.4 1.85e-02 4.93e-01 47.930 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 0.204 0.012 0.216
T90 0.172 0.020 0.192
T50 0.084 0.044 0.128
Peak 1.000 -0.384 0.616
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
236.4377 -0.3606 0.0219 20.8 -50.6 0.0474 8.8 TRIG_00550906
------------------------------------------
Foreground time interval of the image:
0.012 0.216 (delta_t = 0.204 [sec])
Background time interval of the image:
-239.376 0.012 (delta_t = 239.388 [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 0.012 sec. to 0.216 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50812 ( -0.338718 0.3506 )
Norm@50keV : 1.52528E-02 ( -0.00302969 0.00297723 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.17 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 57 degrees of freedom
# Null hypothesis probability = 1.477442e-01
Photon flux (15-150 keV) in 0.204 sec: 1.90833 ( -0.363412 0.36434 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94792e-08 ( -6.36478e-09 6.50666e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 0.216 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35341 ( -1.51757 1.50591 )
Epeak [keV] : 210.261 ( -210.154 -210.154 )
Norm@50keV : 1.82627E-02 ( -0.018265 0.0831675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.12 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 56 degrees of freedom
# Null hypothesis probability = 1.284037e-01
Photon flux (15-150 keV) in 0.204 sec: 1.89483 ( -0.37947 0.37334 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9152e-08 ( -6.9666e-09 6.76158e-09 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 0.216 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34183 ( -0.47438 0.691469 )
beta : -9.25081 ( 9.36906 19.3137 )
Epeak [keV] : 203.322 ( -144.189 -203.233 )
Norm@50keV : 1.82174E-02 ( -0.00617345 0.0250601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.14 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 55 degrees of freedom
# Null hypothesis probability = 1.098943e-01
Photon flux (15-150 keV) in 0.204 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] : 15.3689 (-3.4861 4.55192)
R^2/D10^2 : 0.197352 (-0.117016 0.2842)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.06 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 57 degrees of freedom
# Null hypothesis probability = 5.467531e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.983e-09 8.012e-10
25- 50 8.053e-09 2.878e-09
50-150 1.308e-08 5.305e-09
15-150 2.312e-08 8.737e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-108.742 -199.363)
Norm : 7.79070 (-1.46167 1.4632)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.23 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.465262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.958e-09 2.313e-09
25- 50 7.613e-09 4.431e-09
50-150 1.670e-08 9.437e-09
15-150 2.827e-08 1.656e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.02609 (-2.46295 5.35508)
R1^2/D10^2 : 6.41754 (-5.85602 155.577)
kT2 [keV] : 22.0427 (-6.68934 31.7399)
R2^2/D10^2 : 4.87092E-02 (-0.0461682 0.0776658)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.88 using 59 PHA bins.
# Reduced chi-squared = 1.234 for 55 degrees of freedom
# Null hypothesis probability = 1.139120e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.143e-09 2.350e-09
25- 50 6.876e-09 3.579e-09
50-150 1.725e-08 1.027e-08
15-150 2.827e-08 1.517e-08
Peak spectrum fit
Power-law model
Time interval is from -0.384 sec. to 0.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28235 ( -0.516989 0.506685 )
Norm@50keV : 3.92355E-03 ( -0.00113942 0.00113909 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.15 using 59 PHA bins.
# Reduced chi-squared = 0.8624 for 57 degrees of freedom
# Null hypothesis probability = 7.606160e-01
Photon flux (15-150 keV) in 1 sec: 0.466607 ( -0.139829 0.141327 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8941e-08 ( -1.21885e-08 1.24901e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.384 sec. to 0.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.208838 ( -4.38383 1.87504 )
Epeak [keV] : 81.9218 ( -30.9554 -81.669 )
Norm@50keV : 1.84748E-02 ( -0.0188026 0.96703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.93 using 59 PHA bins.
# Reduced chi-squared = 0.8560 for 56 degrees of freedom
# Null hypothesis probability = 7.698563e-01
Photon flux (15-150 keV) in 1 sec: 0.429376 ( -0.151307 0.152554 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.57846e-08 ( -1.25519e-08 1.34613e-08 ) ergs/cm2
Band function
Time interval is from -0.384 sec. to 0.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.210476 ( -1.40741 4.40498 )
beta : -10.0000 ( 10 1.24345e-14 )
Epeak [keV] : 81.6325 ( -28.4241 155.969 )
Norm@50keV : 1.86011E-02 ( -0.0185825 0.965787 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.93 using 59 PHA bins.
# Reduced chi-squared = 0.8715 for 55 degrees of freedom
# Null hypothesis probability = 7.391179e-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] : 18.4418 (-5.0828 7.7742)
R^2/D10^2 : 2.83007E-02 (-0.0283007 0.0560512)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.25 using 59 PHA bins.
# Reduced chi-squared = 0.8466 for 57 degrees of freedom
# Null hypothesis probability = 7.886740e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.912e-09 1.186e-09
25- 50 9.001e-09 5.158e-09
50-150 2.235e-08 1.461e-08
15-150 3.327e-08 2.042e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-112.841 -199.363)
Norm : 1.95437 (-0.571184 0.571202)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.59 using 59 PHA bins.
# Reduced chi-squared = 0.8699 for 57 degrees of freedom
# Null hypothesis probability = 7.465762e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.867e-09 3.005e-09
25- 50 9.362e-09 5.690e-09
50-150 2.053e-08 1.224e-08
15-150 3.476e-08 2.152e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.72399 (-2.72144 21.8579)
R1^2/D10^2 : 16.8086 (-16.9547 -16.9547)
kT2 [keV] : 19.5256 (-5.69127 -19.5237)
R2^2/D10^2 : 2.27278E-02 (-0.0227366 0.0473284)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.43 using 59 PHA bins.
# Reduced chi-squared = 0.8623 for 55 degrees of freedom
# Null hypothesis probability = 7.560609e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.368e-09 1.574e-09
25- 50 8.437e-09 4.994e-09
50-150 2.327e-08 1.498e-08
15-150 3.508e-08 2.016e-08
Plot creation:
Thu Mar 14 07:51:08 EDT 2013