batgrbproduct Analysis for Trigger=340578
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): Fri Jun 3 16:13:27 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger340578/SDC
======================================================================
Trigger: 00340578 Segment: 000
BAT Trigger Time: 254282970.24 [s; MET]
Trigger Stop: 254282970.368 [s; MET]
UTC: 2009-01-22T02:09:25.804340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 237.692111931381 Dec: -54.3038201952553 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 26.84
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 26.84
Flight Position: [ source = BAT ]
RA: 237.692111931381 Dec: -54.3038201952553 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.711738948883 Dec: -54.3028370346597 [deg; J2000]
{ 15h 50m 50.8s , -54d 18' 10.2" }
+/- 0.644610080029966 [arcmin] (estimated 90% radius based on SNR)
+/- 0.204769305237736 [arcmin] (formal 1-sigma fit error)
SNR: 56.9575244201301
Angular difference between Flight and Ground position is 0.689662 arcmin
Partial Coding Fraction: 0.453125 [ including projection effects ]
Duration
T90: 52.0920000076294 +/- 0.0960833132551662
Measured from: -0.408000022172928
to: 51.6839999854565 [s; relative to TRIGTIME]
T50: 0.420000016689301 +/- 0.00400000810623169
Measured from: 0.0519999861717224
to: 0.472000002861023 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.467999994754791
to: 0.532000005245209 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.53600001335144
to: 51.7879999876022 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.612306 4.428649 1.458662 0.221616
0.073879 0.073570 0.062823 0.061302 [error]
Peak 3.826375 3.524588 1.088861 0.064123
0.037470 0.035913 0.021286 0.009475 [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 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 Power-law 9.84e+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
Fluence Cutoff-PL 1.54e-06 2.08e-06 1.20e-06 2.54e-07 5.03e-06 5.07e-06 erg/cm2
Error 1.13e-07 6.70e-08 8.13e-08 9.31e-08 2.00e-07 2.24e-07 erg/cm2
Peak flux Cutoff-PL 4.22e+01 3.02e+01 8.39e+00 8.42e-01 8.15e+01 8.16e+01 ph/cm2/s
Error 2.59e+00 6.98e-01 2.49e-01 1.20e-01 2.91e+00 2.92e+00 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 2.514 0.000 - - 1.08e-02 0.00e+00 126.860 57
CPL 1.078 0.359 27.1 4.3 6.71e-02 3.22e-02 63.790 56
The chi2 of BB fit is 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 2.851 0.000 - - 3.93e-01 0.00e+00 296.230 57
CPL 1.156 0.216 24.0 3.2 2.81e+00 7.09e-01 46.870 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: 52.096000 sec.
T50 in the 50-300 keV band: 10.048000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 52.324 -0.536 51.788
T90 52.092 -0.408 51.684
T50 0.420 0.052 0.472
Peak 1.000 -0.468 0.532
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.7117 -54.3028 0.0034 36.1 -130.7 9.1619 57.0 TRIG_00340578
------------------------------------------
Foreground time interval of the image:
-0.536 31.661 (delta_t = 32.197 [sec])
Background time interval of the image:
-119.240 -0.536 (delta_t = 118.704 [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 -0.536 sec. to 51.788 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.51429 ( )
Norm@50keV : 1.08381E-02 ( )
------------------------------------------------------------
# Chi-Squared = 126.86 using 59 PHA bins.
# Reduced chi-squared = 2.2255 for 57 degrees of freedom
# Null hypothesis probability = 3.134964e-07
Photon flux (15-150 keV) in 52.32 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.536 sec. to 51.788 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07818 ( -0.372249 0.346099 )
Epeak [keV] : 27.0535 ( -5.04868 3.45682 )
Norm@50keV : 6.71084E-02 ( -0.0237328 0.040572 )
------------------------------------------------------------
# Chi-Squared = 63.79 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 56 degrees of freedom
# Null hypothesis probability = 2.216942e-01
Photon flux (15-150 keV) in 52.32 sec: 1.91518 ( -0.08242 0.08335 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02668e-06 ( -1.97461e-07 2.01568e-07 ) ergs/cm2
Band function
Time interval is from -0.536 sec. to 51.788 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.910042 ( -0.411521 0.422126 )
beta : -3.63151 ( 3.62879 0.443856 )
Epeak [keV] : 28.1426 ( -4.53361 3.04609 )
Norm@50keV : 8.46177E-02 ( -0.0328561 0.0655407 )
------------------------------------------------------------
# Chi-Squared = 61.51 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.544102e-01
Photon flux (15-150 keV) in 52.32 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from -0.468 sec. to 0.532 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.85114 ( )
Norm@50keV : 0.393261 ( )
------------------------------------------------------------
# Chi-Squared = 296.23 using 59 PHA bins.
# Reduced chi-squared = 5.1970 for 57 degrees of freedom
# Null hypothesis probability = 4.965675e-34
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.468 sec. to 0.532 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15619 ( -0.220498 0.211209 )
Epeak [keV] : 24.0448 ( -3.53349 2.89231 )
Norm@50keV : 2.81176 ( -0.604704 0.813295 )
------------------------------------------------------------
# Chi-Squared = 46.87 using 59 PHA bins.
# Reduced chi-squared = 0.8370 for 56 degrees of freedom
# Null hypothesis probability = 8.025404e-01
Photon flux (15-150 keV) in 1 sec: 81.5072 ( -2.8879 2.9297 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.96704e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.468 sec. to 0.532 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03217 ( -0.266894 0.312806 )
beta : -4.26162 ( 4.26159 0.421385 )
Epeak [keV] : 25.3098 ( -3.69021 2.9289 )
Norm@50keV : 3.30438 ( -0.906395 1.58064 )
------------------------------------------------------------
# Chi-Squared = 45.00 using 59 PHA bins.
# Reduced chi-squared = 0.8183 for 55 degrees of freedom
# Null hypothesis probability = 8.297573e-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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Fri Jun 3 16:24:13 EDT 2011