batgrbproduct Analysis for Trigger=318170
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 06:35:52 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/318170
======================================================================
Trigger: 00318170 Segment: 000
BAT Trigger Time: 238892858.368 [s; MET]
Trigger Stop: 238892859.392 [s; MET]
UTC: 2008-07-27T23:07:35.394100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.6448768441636 Dec: 64.1515714708512 [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: 13.3416640641263 [ if not an image trigger ]
Image S/N Ratio: 7.95
Flight Position: [ source = BAT ]
RA: 32.6448768441636 Dec: 64.1515714708512 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 32.6400755431858 Dec: 64.1300500698541 [deg; J2000]
{ 02h 10m 33.6s , +64d 07' 48.2" }
+/- 0.769510148679465 [arcmin] (estimated 90% radius based on SNR)
+/- 0.293860448400933 [arcmin] (formal 1-sigma fit error)
SNR: 44.2251491094343
Angular difference between Flight and Ground position is 1.297383 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 77.6079999804497 +/- 7.26474443526915
Measured from: 1.66800001263618
to: 79.2759999930859 [s; relative to TRIGTIME]
T50: 23.3160000145435 +/- 1.43720841455207
Measured from: 14.9799999892712
to: 38.2960000038147 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 15.2319999933243
to: 16.2319999933243 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.31600001454353
to: 110.227999985218 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.650624 2.958226 2.613055 0.605318
0.057140 0.061595 0.056964 0.050429 [error]
Peak 0.057938 0.103691 0.110149 0.022878
0.006335 0.007377 0.007079 0.005600 [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 5.38e-07 1.17e-06 2.00e-06 7.89e-06 5.48e-06 1.16e-05 erg/cm2
Error 2.86e-08 3.61e-08 5.88e-08 5.45e-07 1.49e-07 5.72e-07 erg/cm2
Peak flux Power-law 5.31e-01 7.02e-01 6.81e-01 1.18e+00 2.30e+00 3.09e+00 ph/cm2/s
Error 7.08e-02 5.82e-02 5.44e-02 1.96e-01 1.65e-01 2.46e-01 ph/cm2/s
Fluence Cutoff-PL 4.90e-07 1.19e-06 2.07e-06 4.93e-06 5.36e-06 8.68e-06 erg/cm2
Error 3.65e-08 3.91e-08 6.82e-08 1.16e-06 1.64e-07 1.15e-06 erg/cm2
Peak flux Cutoff-PL 4.47e-01 7.44e-01 7.41e-01 5.65e-01 2.25e+00 2.50e+00 ph/cm2/s
Error 8.65e-02 6.78e-02 6.77e-02 2.55e-01 1.69e-01 2.99e-01 ph/cm2/s
Fluence Band 4.79e-07 1.17e-06 2.04e-06 4.92e-06 5.30e-06 8.63e-06 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 4.47e-01 7.44e-01 7.41e-01 5.66e-01 2.25e+00 2.50e+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 1.226 0.047 - - 4.80e-03 1.22e-04 68.730 57
CPL 0.861 0.194 175.9 82.0 6.98e-03 1.36e-03 57.430 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.045 0.117 - - 1.99e-02 1.41e-03 79.660 57
CPL 0.269 0.523 122.0 69.5 4.61e-02 2.71e-02 71.850 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: 63.104000 sec.
T50 in the 50-300 keV band: 20.608000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 113.544 -3.316 110.228
T90 77.608 1.668 79.276
T50 23.316 14.980 38.296
Peak 1.000 15.232 16.232
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
32.6401 +64.1301 0.0044 20.2 -64.6 2.7704 44.2 TRIG_00318170
------------------------------------------
Foreground time interval of the image:
-3.316 18.533 (delta_t = 21.849 [sec])
Background time interval of the image:
-239.368 -3.316 (delta_t = 236.052 [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 -3.316 sec. to 110.228 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22559 ( -0.0473478 0.0471505 )
Norm@50keV : 4.79549E-03 ( -0.000121992 0.000121954 )
------------------------------------------------------------
# Chi-Squared = 68.73 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.372669e-01
Photon flux (15-150 keV) in 113.5 sec: 0.565004 ( -0.0153358 0.0153656 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48296e-06 ( -1.49127e-07 1.49378e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.316 sec. to 110.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.860813 ( -0.19796 0.189151 )
Epeak [keV] : 175.883 ( -42.2932 121.7 )
Norm@50keV : 6.98066E-03 ( -0.00120372 0.00152432 )
------------------------------------------------------------
# Chi-Squared = 57.43 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 56 degrees of freedom
# Null hypothesis probability = 4.217913e-01
Photon flux (15-150 keV) in 113.5 sec: 0.551920 ( -0.016602 0.016635 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35739e-06 ( -1.64927e-07 1.64008e-07 ) ergs/cm2
Band function
Time interval is from -3.316 sec. to 110.228 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.24009 ( -1.80169 -1.24141 )
beta : -1.31684 ( -0.0986877 0.0676317 )
Epeak [keV] : 41.1953 ( -9.12747 53.1914 )
Norm@50keV : 0.191987 ( -0.193654 54.8885 )
------------------------------------------------------------
# Chi-Squared = 53.18 using 59 PHA bins.
# Reduced chi-squared = 0.9669 for 55 degrees of freedom
# Null hypothesis probability = 5.445874e-01
Photon flux (15-150 keV) in 113.5 sec: 0.540884 ( -0.01598 0.016979 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.29995e-06 ( -1.65631e-07 1.62464e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.4550 ( )
R^2/D10^2 : 2.76798E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 284.52 using 59 PHA bins.
# Reduced chi-squared = 4.9915 for 57 degrees of freedom
# Null hypothesis probability = 5.770844e-32
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.317e-07 1.243e-08
25- 50 1.133e-06 4.285e-08
50-150 3.165e-06 1.379e-07
15-150 4.530e-06 1.430e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 ( )
Norm : 2.39116 ( )
------------------------------------------------------------
# Chi-Squared = 202.14 using 59 PHA bins.
# Reduced chi-squared = 3.5463 for 57 degrees of freedom
# Null hypothesis probability = 4.073123e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.758e-07 3.439e-07
25- 50 1.300e-06 6.577e-07
50-150 2.851e-06 1.452e-06
15-150 4.827e-06 2.456e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.48285 (-0.878243 0.966279)
R1^2/D10^2 : 0.244893 (-0.0675053 0.100082)
kT2 [keV] : 31.5903 (-3.01771 4.14954)
R2^2/D10^2 : 4.64827E-03 (-0.00157479 0.00193178)
------------------------------------------------------------
# Chi-Squared = 51.06 using 59 PHA bins.
# Reduced chi-squared = 0.9284 for 55 degrees of freedom
# Null hypothesis probability = 6.258173e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.562e-07 4.438e-08
25- 50 1.230e-06 8.178e-08
50-150 3.694e-06 2.815e-07
15-150 5.380e-06 3.876e-07
Peak spectrum fit
Power-law model
Time interval is from 15.232 sec. to 16.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04454 ( -0.117394 0.115983 )
Norm@50keV : 1.99417E-02 ( -0.00141133 0.00141118 )
------------------------------------------------------------
# Chi-Squared = 79.66 using 59 PHA bins.
# Reduced chi-squared = 1.398 for 57 degrees of freedom
# Null hypothesis probability = 2.541294e-02
Photon flux (15-150 keV) in 1 sec: 2.30228 ( -0.164678 0.164838 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12332e-07 ( -1.68757e-08 1.69822e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.232 sec. to 16.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.268925 ( -0.55652 0.489897 )
Epeak [keV] : 121.996 ( -29.8791 109.188 )
Norm@50keV : 4.60922E-02 ( -0.0185219 0.0356579 )
------------------------------------------------------------
# Chi-Squared = 71.85 using 59 PHA bins.
# Reduced chi-squared = 1.283 for 56 degrees of freedom
# Null hypothesis probability = 7.528568e-02
Photon flux (15-150 keV) in 1 sec: 2.24620 ( -0.16931 0.16901 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03589e-07 ( -1.815e-08 1.8138e-08 ) ergs/cm2
Band function
Time interval is from 15.232 sec. to 16.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.268865 ( -0.46664 0.554935 )
beta : -10.00000 ( 4.54761e+10 4.54761e+10 )
Epeak [keV] : 121.977 ( -29.8764 109.18 )
Norm@50keV : 4.60959E-02 ( -0.018527 0.0356769 )
------------------------------------------------------------
# Chi-Squared = 71.85 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 55 degrees of freedom
# Null hypothesis probability = 6.315563e-02
Photon flux (15-150 keV) in 1 sec: 2.24629 ( -0.1694 0.16893 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03493e-07 ( -1.8114e-08 1.8094e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.2200 (-1.73746 1.95881)
R^2/D10^2 : 0.109407 (-0.0279899 0.0365379)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 90.25 using 59 PHA bins.
# Reduced chi-squared = 1.583 for 57 degrees of freedom
# Null hypothesis probability = 3.300246e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.585e-09 1.096e-09
25- 50 4.307e-08 4.650e-09
50-150 1.307e-07 1.655e-08
15-150 1.824e-07 1.710e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 9.14357 ( )
------------------------------------------------------------
# Chi-Squared = 123.68 using 59 PHA bins.
# Reduced chi-squared = 2.1698 for 57 degrees of freedom
# Null hypothesis probability = 7.784184e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.277e-08 1.196e-08
25- 50 4.380e-08 2.314e-08
50-150 9.606e-08 5.090e-08
15-150 1.626e-07 8.665e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.33804 (-2.41778 3.81453)
R1^2/D10^2 : 1.09810 (-0.739416 2.87488)
kT2 [keV] : 26.5967 (-4.1978 9.33103)
R2^2/D10^2 : 3.97034E-02 (-0.0262937 0.032794)
------------------------------------------------------------
# Chi-Squared = 70.86 using 59 PHA bins.
# Reduced chi-squared = 1.288 for 55 degrees of freedom
# Null hypothesis probability = 7.359507e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.467e-08 6.456e-09
25- 50 4.249e-08 1.357e-08
50-150 1.460e-07 4.512e-08
15-150 2.031e-07 5.640e-08
Plot creation:
Thu Jul 28 14:20:05 EDT 2011