batgrbproduct Analysis for Trigger=418178
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 v2.45
Process Start Time (local time): Sun Apr 4 03:24:14 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger418178/GCN5_download_cron
======================================================================
Trigger: 00418178 Segment: 000
BAT Trigger Time: 292019600 [s; MET]
Trigger Stop: 292019664 [s; MET]
UTC: 2010-04-03T20:33:14.326060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 70.2855432071644 Dec: 44.5251385076698 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.57
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.57
Flight Position: [ source = BAT ]
RA: 70.2855432071644 Dec: 44.5251385076698 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 70.245084758203 Dec: 44.5131396048332 [deg; J2000]
{ 04h 40m 58.8s , +44d 30' 47.3" }
+/- 2.85846397185463 [arcmin] (estimated 90% radius based on SNR)
+/- 1.99993258175793 [arcmin] (formal 1-sigma fit error)
SNR: 6.7842244020605
Angular difference between Flight and Ground position is 1.874608 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.277799 0.267204 0.032836 -0.014892
0.047054 0.047767 0.041473 0.037926 [error]
Peak 0.277799 0.267204 0.032836 -0.014892
0.047054 0.047767 0.041473 0.037926 [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 8.22e-08 8.83e-08 6.74e-08 8.39e-08 2.70e-07 3.22e-07 erg/cm2
Error 2.09e-08 2.26e-08 3.27e-08 7.68e-08 7.85e-08 1.26e-07 erg/cm2
Peak flux Power-law 4.23e-02 2.54e-02 9.70e-03 4.95e-03 7.99e-02 8.23e-02 ph/cm2/s
Error 1.03e-02 6.17e-03 4.50e-03 5.08e-03 1.71e-02 1.81e-02 ph/cm2/s
Fluence Cutoff-PL 7.76e-08 1.09e-07 4.91e-08 4.81e-09 2.40e-07 2.40e-07 erg/cm2
Error 2.38e-08 3.25e-08 3.75e-08 5.29e-08 6.96e-08 8.95e-08 erg/cm2
Peak flux Cutoff-PL 3.99e-02 3.11e-02 7.50e-03 4.14e-04 7.89e-02 7.89e-02 ph/cm2/s
Error 1.16e-02 8.95e-03 6.64e-03 3.03e-03 1.65e-02 1.66e-02 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 7.80e-02 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 2.391 0.458 - - 4.33e-04 1.57e-04 61.970 57
CPL 0.466 2.254 28.3 19.9 7.32e-03 2.95e-01 59.460 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.386 0.444 - - 4.36e-04 1.56e-04 62.680 57
CPL 0.540 2.121 27.7 19.5 6.76e-03 2.15e-01 60.150 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
70.2451 +44.5131 0.0283 22.9 24.1 0.6512 6.8 TRIG_00418178
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39052 ( -0.414533 0.501654 )
Norm@50keV : 4.32837E-04 ( -0.000157015 0.000157148 )
------------------------------------------------------------
# Chi-Squared = 61.97 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.033679e-01
Photon flux (15-150 keV) in 64 sec: 7.96436E-02 ( -0.0175349 0.0175714 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69647e-07 ( -7.5344e-08 8.15859e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.466484 ( -2.96986 1.53823 )
Epeak [keV] : 28.2844 ( -28.2878 11.509 )
Norm@50keV : 7.31914E-03 ( -0.00733294 0.582078 )
------------------------------------------------------------
# Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 56 degrees of freedom
# Null hypothesis probability = 3.506753e-01
Photon flux (15-150 keV) in 64 sec: 7.79625E-02 ( -0.016831 0.0171771 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39748e-07 ( -6.16205e-08 7.76051e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.327301 ( 0.372429 2.8886 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 29.1123 ( -11.3532 10.9441 )
Norm@50keV : 8.74950E-03 ( -0.00769801 36574.4 )
------------------------------------------------------------
# Chi-Squared = 59.48 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 55 degrees of freedom
# Null hypothesis probability = 3.159772e-01
Photon flux (15-150 keV) in 64 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] : 8.12699 (-1.68745 1.94005)
R^2/D10^2 : 8.73830E-02 (-0.0504617 0.132079)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 60.88 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 57 degrees of freedom
# Null hypothesis probability = 3.382316e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.756e-08 2.962e-08
25- 50 1.215e-07 5.144e-08
50-150 3.359e-08 2.231e-08
15-150 2.227e-07 1.002e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.0345 (-13.6792 27.2301)
Norm : 0.579518 (-0.192744 0.321704)
------------------------------------------------------------
# Chi-Squared = 59.88 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 57 degrees of freedom
# Null hypothesis probability = 3.714898e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.106e-08 2.489e-08
25- 50 1.004e-07 3.441e-08
50-150 6.674e-08 4.317e-08
15-150 2.482e-07 9.478e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.84374 (-2.84699 -2.84699)
R1^2/D10^2 : 3.75797 (-3.73648 -3.73648)
kT2 [keV] : 9.65506 (-2.40479 -9.65968)
R2^2/D10^2 : 3.75160E-02 (-0.0374279 0.0926365)
------------------------------------------------------------
# Chi-Squared = 58.24 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.570388e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.700e-08 3.741e-08
25- 50 1.102e-07 6.464e-08
50-150 5.011e-08 3.421e-08
15-150 2.373e-07 1.286e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.38588 ( -0.400463 0.486674 )
Norm@50keV : 4.35541E-04 ( -0.00015612 0.000156509 )
------------------------------------------------------------
# Chi-Squared = 62.68 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.818510e-01
Photon flux (15-150 keV) in 64 sec: 7.99249E-02 ( -0.0170813 0.0171344 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71056e-07 ( -7.49677e-08 8.12998e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.540403 ( -2.76265 1.47849 )
Epeak [keV] : 27.6934 ( -27.6966 11.2431 )
Norm@50keV : 6.76310E-03 ( -0.00677488 0.423585 )
------------------------------------------------------------
# Chi-Squared = 60.15 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.280713e-01
Photon flux (15-150 keV) in 64 sec: 7.88876E-02 ( -0.0164523 0.016629 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41724e-07 ( -6.13434e-08 7.68742e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.385575 ( 0.431847 2.66411 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 28.5737 ( -9.5919 10.6445 )
Norm@50keV : 8.28667E-03 ( -0.00724336 1298.88 )
------------------------------------------------------------
# Chi-Squared = 60.16 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.942968e-01
Photon flux (15-150 keV) in 64 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] : 7.97845 (-1.63291 1.85695)
R^2/D10^2 : 9.54296E-02 (-0.0541288 0.139377)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 61.87 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.066123e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.016e-08 2.648e-08
25- 50 1.222e-07 5.116e-08
50-150 3.181e-08 1.987e-08
15-150 2.242e-07 8.586e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.7831 (-13.3576 25.8788)
Norm : 0.586623 (-0.190704 0.309228)
------------------------------------------------------------
# Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.494560e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.181e-08 2.266e-08
25- 50 1.009e-07 3.621e-08
50-150 6.655e-08 4.840e-08
15-150 2.493e-07 9.258e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.90909 (-2.46695 4.35188)
R1^2/D10^2 : 3.36546 (-3.32385 22214.1)
kT2 [keV] : 9.66183 (-2.39529 4.56101)
R2^2/D10^2 : 3.73673E-02 (-0.0347562 0.0938345)
------------------------------------------------------------
# Chi-Squared = 58.93 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.339741e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.807e-08 3.776e-08
25- 50 1.106e-07 6.323e-08
50-150 5.015e-08 3.498e-08
15-150 2.388e-07 1.278e-07
Plot creation:
Sun Apr 4 03:41:34 EDT 2010