batgrbproduct Analysis for Trigger=317662
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 v2.45
Process Start Time (local time): Thu Aug 6 04:52:52 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/317662
======================================================================
Trigger: 00317662 Segment: 000
BAT Trigger Time: 238479567.36 [s; MET]
Trigger Stop: 238479568.384 [s; MET]
UTC: 2008-07-23T04:19:24.398120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.512361086236 Dec: -6.92252284367775 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.42
Image Trigger?: NO
Rate S/N Ratio: 18.0554700852678 [ if not an image trigger ]
Image S/N Ratio: 8.42
Flight Position: [ source = BAT ]
RA: 274.512361086236 Dec: -6.92252284367775 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.464617586536 Dec: -6.90858110057763 [deg; J2000]
{ 18h 17m 51.5s , -06d 54' 30.9" }
+/- 1.6259314025759 [arcmin] (estimated 90% radius based on SNR)
+/- 0.555951762849259 [arcmin] (formal 1-sigma fit error)
SNR: 15.1895106079697
Angular difference between Flight and Ground position is 2.964247 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 17.9120000004768 +/- 1.93204556098818
Measured from: 0.0439999997615814
to: 17.9560000002384 [s; relative to TRIGTIME]
T50: 11.944000005722 +/- 2.29455179920174
Measured from: 1.38799998164177
to: 13.3319999873638 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.120000004768372
to: 0.879999995231628 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.232000023126602
to: 19.1679999828339 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.179917 0.298734 0.120425 0.058075
0.026099 0.024470 0.020989 0.018025 [error]
Peak 0.029134 0.056572 0.027514 0.010447
0.006155 0.006072 0.005321 0.004374 [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 5.82e-08 9.46e-08 1.16e-07 2.83e-07 3.49e-07 5.52e-07 erg/cm2
Error 1.04e-08 1.07e-08 2.00e-08 1.01e-07 4.68e-08 1.19e-07 erg/cm2
Peak flux Power-law 3.10e-01 3.11e-01 2.19e-01 2.45e-01 9.37e-01 1.09e+00 ph/cm2/s
Error 7.10e-02 4.61e-02 4.15e-02 9.21e-02 1.35e-01 1.61e-01 ph/cm2/s
Fluence Cutoff-PL 5.73e-08 9.67e-08 1.16e-07 2.02e-07 3.42e-07 4.72e-07 erg/cm2
Error 1.11e-08 1.37e-08 2.13e-08 1.95e-07 5.64e-08 1.88e-07 erg/cm2
Peak flux Cutoff-PL 2.64e-01 3.59e-01 2.21e-01 5.55e-02 8.89e-01 9.00e-01 ph/cm2/s
Error 8.24e-02 6.71e-02 5.40e-02 1.42e-01 1.67e-01 0.00e+00 ph/cm2/s
Fluence Band 5.30e-08 1.07e-07 1.06e-07 1.76e-07 3.26e-07 4.46e-07 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 2.37e-01 3.90e-01 2.04e-01 1.28e-01 8.93e-01 9.69e-01 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 1.701 0.208 - - 1.95e-03 2.45e-04 82.570 57
CPL 1.530 0.666 119.2 0.0 2.43e-03 0.00e+00 82.440 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.505 0.239 - - 7.50e-03 1.13e-03 53.650 57
CPL 0.164 1.498 60.3 72.0 4.15e-02 2.19e-01 49.950 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: 2.816000 sec.
T50 in the 50-300 keV band: 1.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.400 -0.232 19.168
T90 17.912 0.044 17.956
T50 11.944 1.388 13.332
Peak 1.000 -0.120 0.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.4646 -6.9086 0.0126 7.2 6.5 0.6673 15.2 TRIG_00317662
------------------------------------------
Foreground time interval of the image:
-0.232 18.341 (delta_t = 18.573 [sec])
Background time interval of the image:
-239.360 -0.232 (delta_t = 239.128 [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 -0.232 sec. to 19.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70080 ( -0.205485 0.210181 )
Norm@50keV : 1.94586E-03 ( -0.000247364 0.000243112 )
------------------------------------------------------------
# Chi-Squared = 82.57 using 59 PHA bins.
# Reduced chi-squared = 1.449 for 57 degrees of freedom
# Null hypothesis probability = 1.503374e-02
Photon flux (15-150 keV) in 19.4 sec: 0.258504 ( -0.029392 0.0294145 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49497e-07 ( -4.62944e-08 4.72448e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.232 sec. to 19.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52956 ( -0.959095 0.373579 )
Epeak [keV] : 119.228 ( )
Norm@50keV : 2.43177E-03 ( )
------------------------------------------------------------
# Chi-Squared = 82.44 using 59 PHA bins.
# Reduced chi-squared = 1.472 for 56 degrees of freedom
# Null hypothesis probability = 1.229782e-02
Photon flux (15-150 keV) in 19.4 sec: 0.256438 ( -0.030885 0.030552 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.42051e-07 ( -5.93252e-08 5.34839e-08 ) ergs/cm2
Band function
Time interval is from -0.232 sec. to 19.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.47165 ( -2.71443 -1.4471 )
beta : -2.13970 ( -0.587349 0.422178 )
Epeak [keV] : 35.6314 ( -9.39164 26.1625 )
Norm@50keV : 0.223271 ( -0.199452 33.4401 )
------------------------------------------------------------
# Chi-Squared = 78.43 using 59 PHA bins.
# Reduced chi-squared = 1.426 for 55 degrees of freedom
# Null hypothesis probability = 2.070034e-02
Photon flux (15-150 keV) in 19.4 sec: 0.251016 ( -0.033758 0.028119 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25879e-07 ( -5.34295e-08 4.84185e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.2633 (-1.23247 1.53426)
R^2/D10^2 : 0.110471 (-0.0454646 0.0697228)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 94.98 using 59 PHA bins.
# Reduced chi-squared = 1.666 for 57 degrees of freedom
# Null hypothesis probability = 1.186820e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.636e-08 9.564e-09
25- 50 1.195e-07 1.838e-08
50-150 6.722e-08 1.919e-08
15-150 2.331e-07 3.383e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 119.990 (-26.3206 -100.327)
Norm : 1.10385 (-0.152578 0.197108)
------------------------------------------------------------
# Chi-Squared = 82.57 using 59 PHA bins.
# Reduced chi-squared = 1.449 for 57 degrees of freedom
# Null hypothesis probability = 1.503925e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.578e-08 9.525e-09
25- 50 9.979e-08 1.320e-08
50-150 1.781e-07 3.236e-08
15-150 3.336e-07 4.326e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.17026 (-1.21869 1.33178)
R1^2/D10^2 : 0.221293 (-0.0934067 0.168652)
kT2 [keV] : 52.2109 (-24.0353 -52.3644)
R2^2/D10^2 : 3.33560E-04 (-0.000307566 0.000878059)
------------------------------------------------------------
# Chi-Squared = 73.11 using 59 PHA bins.
# Reduced chi-squared = 1.329 for 55 degrees of freedom
# Null hypothesis probability = 5.169782e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.448e-08 1.635e-08
25- 50 1.091e-07 3.410e-08
50-150 1.999e-07 9.813e-08
15-150 3.634e-07 1.435e-07
Peak spectrum fit
Power-law model
Time interval is from -0.120 sec. to 0.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50453 ( -0.237528 0.241008 )
Norm@50keV : 7.49529E-03 ( -0.00113532 0.00112401 )
------------------------------------------------------------
# Chi-Squared = 53.65 using 59 PHA bins.
# Reduced chi-squared = 0.9412 for 57 degrees of freedom
# Null hypothesis probability = 6.015383e-01
Photon flux (15-150 keV) in 1 sec: 0.936849 ( -0.134777 0.134876 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.10525e-08 ( -1.16996e-08 1.19512e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.120 sec. to 0.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.164435 ( -1.79427 1.20137 )
Epeak [keV] : 60.3009 ( -14.8542 129.194 )
Norm@50keV : 4.14509E-02 ( -0.0414806 0.39577 )
------------------------------------------------------------
# Chi-Squared = 49.95 using 59 PHA bins.
# Reduced chi-squared = 0.8920 for 56 degrees of freedom
# Null hypothesis probability = 7.018854e-01
Photon flux (15-150 keV) in 1 sec: 0.888621 ( -0.142418 0.142279 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15395e-08 ( 1.46361e-08 -6.15395e-08 ) ergs/cm2
Band function
Time interval is from -0.120 sec. to 0.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.43226 ( -2.2027 -1.54952 )
beta : -2.17075 ( -1.64907 0.549998 )
Epeak [keV] : 40.1703 ( -11.6474 27.3706 )
Norm@50keV : 1.96387 ( -1.83958 51.3602 )
------------------------------------------------------------
# Chi-Squared = 47.18 using 59 PHA bins.
# Reduced chi-squared = 0.8578 for 55 degrees of freedom
# Null hypothesis probability = 7.642219e-01
Photon flux (15-150 keV) in 1 sec: 0.893203 ( -0.140231 0.132487 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.3023e-08 ( -1.0141e-08 1.44548e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.6282 (-1.85697 2.33147)
R^2/D10^2 : 0.200804 (-0.0919055 0.155958)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.70 using 59 PHA bins.
# Reduced chi-squared = 0.9246 for 57 degrees of freedom
# Null hypothesis probability = 6.368801e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.791e-09 1.602e-09
25- 50 2.266e-08 4.515e-09
50-150 2.245e-08 7.315e-09
15-150 5.190e-08 1.126e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 192.628 (-13.7954 -110.899)
Norm : 3.85087 (-0.550621 0.566768)
------------------------------------------------------------
# Chi-Squared = 52.07 using 59 PHA bins.
# Reduced chi-squared = 0.9134 for 57 degrees of freedom
# Null hypothesis probability = 6.602599e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.632e-09 5.275e-09
25- 50 1.845e-08 1.017e-08
50-150 4.001e-08 2.199e-08
15-150 6.809e-08 3.774e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.8421 (-1.5612 2.92381)
R1^2/D10^2 : 0.313783 (-0.187535 0.515907)
kT2 [keV] : 197.356 ( )
R2^2/D10^2 : 8.64386E-05 (-5.4401e-05 0.0457788)
------------------------------------------------------------
# Chi-Squared = 47.17 using 59 PHA bins.
# Chi-Squared = 47.06 using 59 PHA bins.
# Reduced chi-squared = 0.8576 for 55 degrees of freedom
# Reduced chi-squared = 0.8556 for 55 degrees of freedom
# Null hypothesis probability = 7.645184e-01
# Null hypothesis probability = 7.681087e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.107e-09 4.170e-09
25- 50 2.182e-08 1.128e-08
50-150 3.735e-08 1.868e-08
15-150 6.728e-08 3.001e-08
Plot creation:
Thu Jul 28 15:03:47 EDT 2011