batgrbproduct Analysis for Trigger=325895
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 Jul 27 13:02:42 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger325895/SDC
======================================================================
Trigger: 00325895 Segment: 000
BAT Trigger Time: 244043704 [s; MET]
Trigger Stop: 244044024 [s; MET]
UTC: 2008-09-25T13:55:00.874580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.60070425957 Dec: 35.2262795112816 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.46
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.46
Flight Position: [ source = BAT ]
RA: 299.60070425957 Dec: 35.2262795112816 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.591497375724 Dec: 35.2068183456817 [deg; J2000]
{ 19h 58m 22.0s , +35d 12' 24.5" }
+/- 1.89272565854624 [arcmin] (estimated 90% radius based on SNR)
+/- 0.922399903178455 [arcmin] (formal 1-sigma fit error)
SNR: 12.2258440557912
Angular difference between Flight and Ground position is 1.251852 arcmin
Partial Coding Fraction: 0.07324219 [ including projection effects ]
Duration
T90: 443.084000021219 +/- 510.049068503434
Measured from: -110.807999998331
to: 332.276000022888 [s; relative to TRIGTIME]
T50: 282.319999992847 +/- 72.7695080019055
Measured from: -25.0719999969006
to: 257.247999995947 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 116.631999999285
to: 117.631999999285 [s; relative to TRIGTIME]
Total Fluence
Measured from: -130.016000002623
to: 936.715999990702 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.526267 14.150073 8.747609 2.175252
0.455745 0.460059 0.430593 0.443619 [error]
Peak 0.070305 0.064515 0.046075 0.043005
0.022416 0.021538 0.020979 0.021214 [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 5.13e-06 7.15e-06 7.39e-06 1.40e-05 2.41e-05 3.36e-05 erg/cm2
Error 3.66e-07 3.01e-07 4.49e-07 1.81e-06 1.05e-06 2.17e-06 erg/cm2
Peak flux Power-law 8.10e-01 6.04e-01 3.00e-01 2.12e-01 1.81e+00 1.93e+00 ph/cm2/s
Error 6.83e-01 2.14e-01 2.40e-01 3.14e-01 6.60e-01 6.64e-01 ph/cm2/s
Fluence Cutoff-PL 4.75e-06 7.41e-06 7.50e-06 7.71e-06 2.33e-05 2.74e-05 erg/cm2
Error 4.69e-07 3.66e-07 4.81e-07 3.71e-06 1.24e-06 3.95e-06 erg/cm2
Peak flux Cutoff-PL 8.09e-01 6.04e-01 3.01e-01 2.12e-01 1.82e+00 1.93e+00 ph/cm2/s
Error 6.82e-01 2.10e-01 1.82e-01 3.12e-01 6.55e-01 6.64e-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 1.954 0.080 - - 2.45e-03 1.09e-04 50.210 57
CPL 1.527 0.362 54.0 19.7 4.04e-03 1.76e-03 45.750 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.009 0.917 - - 1.20e-02 5.47e-03 68.990 57
CPL 2.013 0.000 15.9 0.0 1.19e-02 0.00e+00 68.910 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 1066.730 -130.016 936.716
T90 443.084 -110.808 332.276
T50 282.320 -25.072 257.248
Peak 1.000 116.632 117.632
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.5915 +35.2068 0.0157 54.6 173.1 12.4499 12.2 TRIG_00325895
------------------------------------------
Foreground time interval of the image:
-7.499 336.901 (delta_t = 344.400 [sec])
Background time interval of the image:
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 -130.016 sec. to 936.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95416 ( -0.0793797 0.0806704 )
Norm@50keV : 2.45390E-03 ( -0.000109097 0.000108477 )
------------------------------------------------------------
# Chi-Squared = 50.21 using 59 PHA bins.
# Reduced chi-squared = 0.8810 for 57 degrees of freedom
# Null hypothesis probability = 7.255791e-01
Photon flux (15-150 keV) in 1067 sec: 0.360540 ( -0.0160859 0.0161574 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40986e-05 ( -1.04381e-06 1.04693e-06 ) ergs/cm2
Cutoff power-law model
Time interval is from -130.016 sec. to 936.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52704 ( -0.377444 0.346302 )
Epeak [keV] : 53.9645 ( -10.5894 28.7515 )
Norm@50keV : 4.03844E-03 ( -0.00131863 0.00219728 )
------------------------------------------------------------
# Chi-Squared = 45.75 using 59 PHA bins.
# Reduced chi-squared = 0.8170 for 56 degrees of freedom
# Null hypothesis probability = 8.340873e-01
Photon flux (15-150 keV) in 1067 sec: 0.349374 ( -0.018236 0.01831 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32893e-05 ( -1.24113e-06 1.23569e-06 ) ergs/cm2
Band function
Time interval is from -130.016 sec. to 936.716 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30609 ( -0.45456 0.769806 )
beta : -2.25719 ( 2.25367 0.244772 )
Epeak [keV] : 48.3137 ( -11.0705 17.0428 )
Norm@50keV : 5.40269E-03 ( -0.00240555 0.0105107 )
------------------------------------------------------------
# Chi-Squared = 44.05 using 59 PHA bins.
# Reduced chi-squared = 0.8010 for 55 degrees of freedom
# Null hypothesis probability = 8.548399e-01
Photon flux (15-150 keV) in 1067 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] : 12.1804 ( )
R^2/D10^2 : 7.60512E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 147.00 using 59 PHA bins.
# Reduced chi-squared = 2.5790 for 57 degrees of freedom
# Null hypothesis probability = 6.942385e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.549e-06 1.985e-07
25- 50 8.163e-06 3.889e-07
50-150 7.354e-06 6.423e-07
15-150 1.807e-05 7.789e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.0330 (-10.8199 13.5141)
Norm : 1.62938 (-0.110946 0.121232)
------------------------------------------------------------
# Chi-Squared = 46.65 using 59 PHA bins.
# Reduced chi-squared = 0.8184 for 57 degrees of freedom
# Null hypothesis probability = 8.344880e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.521e-06 2.982e-07
25- 50 7.509e-06 3.190e-07
50-150 1.086e-05 1.001e-06
15-150 2.289e-05 1.147e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.68061 (-1.75961 1.91369)
R1^2/D10^2 : 0.488009 (-0.258321 0.990884)
kT2 [keV] : 20.7328 (-4.35412 10.8547)
R2^2/D10^2 : 7.06408E-03 (-0.00544426 0.0124058)
------------------------------------------------------------
# Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.262835e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.163e-06 7.154e-07
25- 50 7.568e-06 1.006e-06
50-150 1.066e-05 2.310e-06
15-150 2.239e-05 3.302e-06
Peak spectrum fit
Power-law model
Time interval is from 116.632 sec. to 117.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00908 ( -0.822711 1.01073 )
Norm@50keV : 1.20374E-02 ( -0.00601318 0.00492352 )
------------------------------------------------------------
# Chi-Squared = 68.99 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.325607e-01
Photon flux (15-150 keV) in 1 sec: 1.81355 ( -0.658862 0.660455 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11021e-07 ( -4.44527e-08 4.61389e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 116.632 sec. to 117.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01277 ( )
Epeak [keV] : 15.8841 ( )
Norm@50keV : 1.18504E-02 ( )
------------------------------------------------------------
# Chi-Squared = 68.91 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 56 degrees of freedom
# Null hypothesis probability = 1.152241e-01
Photon flux (15-150 keV) in 1 sec: 1.81929 ( -0.65793 0.65307 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11867e-07 ( -4.49074e-08 4.5301e-08 ) ergs/cm2
Band function
Time interval is from 116.632 sec. to 117.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98881 ( -172.619 -172.619 )
beta : -2.05218 ( -1.92794 0.859554 )
Epeak [keV] : 19.0140 ( -18.9731 12.0627 )
Norm@50keV : 1.17671E+04 ( -11989.3 1.7489e+06 )
------------------------------------------------------------
# Chi-Squared = 68.95 using 59 PHA bins.
# Reduced chi-squared = 1.254 for 55 degrees of freedom
# Null hypothesis probability = 9.785890e-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] : 5.50591 (-1.74731 4.61887)
R^2/D10^2 : 9.21722 (-9.20971 50.3421)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 73.48 using 59 PHA bins.
# Reduced chi-squared = 1.289 for 57 degrees of freedom
# Null hypothesis probability = 6.986220e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.246e-08 1.992e-08
25- 50 2.669e-08 1.794e-08
50-150 1.695e-09 1.713e-09
15-150 6.086e-08 3.755e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.3275 (-100.623 -100.623)
Norm : 7.47770 (-2.705 21.1554)
------------------------------------------------------------
# Chi-Squared = 70.52 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 57 degrees of freedom
# Null hypothesis probability = 1.075329e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.954e-08 1.281e-08
25- 50 3.375e-08 2.142e-08
50-150 5.448e-08 4.388e-08
15-150 1.078e-07 7.520e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.76537 (-1.56003 2.53308)
R1^2/D10^2 : 16.4824 (-14.3393 105.622)
kT2 [keV] : 48.7481 (-28.2208 -48.7621)
R2^2/D10^2 : 3.24496E-03 (-0.00312181 0.0364495)
------------------------------------------------------------
# Chi-Squared = 65.17 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 55 degrees of freedom
# Null hypothesis probability = 1.638938e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.380e-08 2.131e-08
25- 50 2.524e-08 1.468e-08
50-150 7.413e-08 4.517e-08
15-150 1.332e-07 7.075e-08
Plot creation:
Wed Jul 27 13:40:47 EDT 2011