batgrbproduct Analysis for Trigger=340919
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 v2.42
Process Start Time (local time): Fri Jan 23 13:36:55 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger340919/GCN5_download_cron
======================================================================
Trigger: 00340919 Segment: 000
BAT Trigger Time: 254412344 [s; MET]
Trigger Stop: 254412408 [s; MET]
UTC: 2009-01-23T14:05:39.560340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.190752254976 Dec: -61.9441329779638 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.8
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.8
Flight Position: [ source = BAT ]
RA: 170.190752254976 Dec: -61.9441329779638 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.089488225471 Dec: -61.9345905576451 [deg; J2000]
{ 11h 20m 21.5s , -61d 56' 04.5" }
+/- 3.28718135116852 [arcmin] (estimated 90% radius based on SNR)
+/- 1.79397160999844 [arcmin] (formal 1-sigma fit error)
SNR: 5.55646853503082
Angular difference between Flight and Ground position is 2.914894 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 0.919999986886978 +/- 0.451486421040818
Measured from: 194.68000009656
to: 195.600000083447 [s; relative to TRIGTIME]
T50: 0.372000008821487 +/- 0.399969995176766
Measured from: 195.012000083923
to: 195.384000092745 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 194.641999989748
to: 195.641999989748 [s; relative to TRIGTIME]
Total Fluence
Measured from: 194.648000001907
to: 195.683999985456 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.025120 0.014433 0.011724 0.011032
0.006644 0.006264 0.005329 0.004603 [error]
Peak 0.025298 0.013809 0.010951 0.011161
0.006465 0.006134 0.005226 0.004509 [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 6.61e-09 8.89e-09 8.79e-09 1.57e-08 2.94e-08 4.12e-08 erg/cm2
Error 3.15e-09 2.93e-09 7.14e-09 2.27e-08 1.19e-08 2.64e-08 erg/cm2
Peak flux Power-law 2.21e-01 1.57e-01 7.36e-02 4.84e-02 4.74e-01 5.00e-01 ph/cm2/s
Error 1.03e-01 5.20e-02 4.47e-02 6.11e-02 1.54e-01 1.64e-01 ph/cm2/s
Fluence Cutoff-PL 6.63e-09 8.89e-09 8.78e-09 1.55e-08 2.94e-08 3.96e-08 erg/cm2
Error 3.15e-09 2.93e-09 5.29e-09 2.25e-08 1.19e-08 2.62e-08 erg/cm2
Peak flux Cutoff-PL 2.21e-01 1.57e-01 7.35e-02 4.80e-02 4.74e-01 4.99e-01 ph/cm2/s
Error 1.03e-01 5.21e-02 4.47e-02 6.07e-02 1.54e-01 1.64e-01 ph/cm2/s
Fluence Band 6.56e-09 9.00e-09 8.58e-09 1.42e-08 2.89e-08 3.79e-08 erg/cm2
Error 3.22e-09 3.18e-09 5.66e-09 1.74e-08 1.09e-08 2.39e-08 erg/cm2
Peak flux Band 2.18e-01 1.58e-01 7.46e-02 2.54e-02 4.62e-01 5.04e-01 ph/cm2/s
Error 9.40e+00 6.54e-02 4.90e-02 4.87e-02 1.58e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.017 0.735 - - 3.07e-03 1.35e-03 51.289 57
CPL 2.067 1.189 30.5 5000.0 2.64e-03 3.22e-02 51.113 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.092 0.740 - - 3.03e-03 1.39e-03 53.510 57
CPL 2.036 0.748 9997.4 0.0 3.18e-03 1.40e-03 53.544 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 1.036 194.648 195.684
T90 0.920 194.680 195.600
T50 0.372 195.012 195.384
Peak 1.000 194.642 195.642
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.0895 -61.9346 0.0346 31.7 8.4 0.0686 5.6 TRIG_00340919
------------------------------------------
Foreground time interval of the image:
194.648 195.684 (delta_t = 1.036 [sec])
Background time interval of the image:
-239.000 194.648 (delta_t = 433.648 [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 194.648 sec. to 195.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01688 ( -0.673626 0.796703 )
Norm@50keV : 3.072373E-03 ( -1.421881E-03 1.273056E-03) )
------------------------------------------------------------
Chi-Squared = 51.28909 using 59 PHA bins.
Reduced chi-squared = 0.8998086 for 57 degrees of freedom
Null hypothesis probability = 0.688
Photon flux (15-150 keV) in 1.036 sec: 0.464468 ( -0.149992 0.150045 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93943e-08 ( -1.15337e-08 1.2318e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 194.648 sec. to 195.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06716 ( -1.89473 0.483486 )
Epeak [keV] : 30.4532 ( -30.4425 9969.55 )
Norm@50keV : 2.635345E-03 ( -2.635345E-03 6.168489E-02) )
------------------------------------------------------------
Chi-Squared = 51.11283 using 59 PHA bins.
Reduced chi-squared = 0.9127292 for 56 degrees of freedom
Null hypothesis probability = 0.660
Photon flux (15-150 keV) in 1.036 sec: 0.464267 ( -0.149943 0.149995 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93638e-08 ( -1.15131e-08 1.23391e-08 ) ergs/cm2
Band function
Time interval is from 194.648 sec. to 195.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38715 ( -8.61285 6.38715 )
beta : -2.06355 ( -7.93645 0.715526 )
Epeak [keV] : 23.2728 ( -23.1728 9976.73 )
Norm@50keV : 9.415568E-03 ( -9.415568E-03 2804.41 )
------------------------------------------------------------
Chi-Squared = 51.25234 using 59 PHA bins.
Reduced chi-squared = 0.9318607 for 55 degrees of freedom
Null hypothesis probability = 0.619
Photon flux (15-150 keV) in 1.036 sec: 0.463016 ( -0.149154 0.149166 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89482e-08 ( -1.07309e-08 1.11506e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.77120 -2.04232 3.6115
R^2/D10^2 : 0.962321 -0.962321 3.50697
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 54.35059 using 59 PHA bins.
Reduced chi-squared = 0.9535192 for 57 degrees of freedom
Null hypothesis probability = 0.575
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.085e-09 3.372e-09
25- 50 9.090e-09 5.495e-09
50-150 1.334e-09 1.160e-09
15-150 1.751e-08 9.287e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 66.2230 -66.2229 133.777
Norm : 2.27859 -1.02754 2.56428
------------------------------------------------------------
Chi-Squared = 52.46688 using 59 PHA bins.
but latest trial 6.44806 gives Chi-Squared = 5.28178
Reduced chi-squared = 0.9204715 for 57 degrees of freedom
Null hypothesis probability = 0.646
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.018e-09 2.948e-09
25- 50 9.429e-09 5.337e-09
50-150 1.161e-08 8.484e-09
15-150 2.706e-08 1.522e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.85820 -1.84169 2.64595
R1^2/D10^2 : 1.60982 -1.27942 6.72113
kT2 [keV] : 70.4042 -50.184 129.596
R2^2/D10^2 : 3.593946E-04 -0.00033585 1e+24
------------------------------------------------------------
Chi-Squared = 48.16674 using 59 PHA bins.
but latest trial 2.357521E-05 gives Chi-Squared = 2.67764
Reduced chi-squared = 0.8757588 for 55 degrees of freedom
Null hypothesis probability = 0.731
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.495e-09 3.940e-09
25- 50 8.123e-09 4.342e-09
50-150 1.957e-08 1.634e-08
15-150 3.518e-08 1.978e-08
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 194.648 sec. to 195.636 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09250 ( -0.670432 0.810039 )
Norm@50keV : 3.026617E-03 ( -1.456870E-03 1.325915E-03) )
------------------------------------------------------------
Chi-Squared = 53.51012 using 59 PHA bins.
Reduced chi-squared = 0.9387741 for 57 degrees of freedom
Null hypothesis probability = 0.607
Photon flux (15-150 keV) in 0.9880 sec: 0.474412 ( -0.153695 0.153713 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77631e-08 ( -1.1023e-08 1.19266e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 194.648 sec. to 195.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03621 ( -0.620858 0.875445 )
Epeak [keV] : 9997.39 ( )
Norm@50keV : 3.182556E-03 ( -1.476950E-03 1.318746E-03) )
------------------------------------------------------------
Chi-Squared = 53.54449 using 59 PHA bins.
Reduced chi-squared = 0.9561517 for 56 degrees of freedom
Null hypothesis probability = 0.568
Photon flux (15-150 keV) in 0.9880 sec: 0.474212 ( -0.153645 0.153663 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77441e-08 ( -1.10118e-08 1.19351e-08 ) ergs/cm2
Band function
Time interval is from 194.648 sec. to 195.636 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44579 ( -2.012253E-04 14.9998 )
beta : -1.65590 ( -0.809944 0.670169 )
Epeak [keV] : 7.30286 ( -7.20286 9992.70 )
Norm@50keV : 7.918002E-03 ( -0.197774 0.180220 )
------------------------------------------------------------
Chi-Squared = 54.67240 using 59 PHA bins.
Reduced chi-squared = 0.9940436 for 55 degrees of freedom
Null hypothesis probability = 0.487
Photon flux (15-150 keV) in 0.9880 sec: 0.461625 ( -0.149394 0.166299 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68767e-08 ( -1.13249e-08 1.2417e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.55473 -1.96641 3.45837
R^2/D10^2 : 1.13242 -1.13242 4.15648
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 56.06627 using 59 PHA bins.
Reduced chi-squared = 0.9836187 for 57 degrees of freedom
Null hypothesis probability = 0.510
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.176e-09 3.659e-09
25- 50 8.622e-09 5.092e-09
50-150 1.120e-09 9.782e-10
15-150 1.692e-08 9.484e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.6572 -35.6852 147.343
Norm : 2.56779 -1.23626 3.99315
------------------------------------------------------------
Chi-Squared = 54.58642 using 59 PHA bins.
Reduced chi-squared = 0.9576564 for 57 degrees of freedom
Null hypothesis probability = 0.566
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.274e-09 3.335e-09
25- 50 9.174e-09 5.127e-09
50-150 9.346e-09 7.202e-09
15-150 2.479e-08 1.373e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.78722 -1.80382 2.54914
R1^2/D10^2 : 1.75085 -1.31775 7.56391
kT2 [keV] : 62.8742 -62.8741 137.126
R2^2/D10^2 : 4.179395E-04 -0.000399006 1e+24
------------------------------------------------------------
Chi-Squared = 50.69901 using 59 PHA bins.
but latest trial 3.98340 gives Chi-Squared = 2.61090
but latest trial 0.361000 gives Chi-Squared = 3.25536
but latest trial 2.09807 gives Chi-Squared = 5.37461
Reduced chi-squared = 0.9218001 for 55 degrees of freedom
Null hypothesis probability = 0.640
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.444e-09 4.131e-09
25- 50 7.840e-09 4.432e-09
50-150 1.724e-08 1.682e-08
15-150 3.253e-08 2.156e-08
Plot creation:
Fri Jan 23 13:54:31 EST 2009