batgrbproduct Analysis for Trigger=503926
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): Sun Sep 25 02:01:53 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger503926/GCN5_download_cron
======================================================================
Trigger: 00503926 Segment: 000
BAT Trigger Time: 338547808.128 [s; MET]
Trigger Stop: 338547812.224 [s; MET]
UTC: 2011-09-24T09:03:20.730380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 234.748127619422 Dec: -66.3082032318706 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.6
Image Trigger?: NO
Rate S/N Ratio: 14.4913767461894 [ if not an image trigger ]
Image S/N Ratio: 6.6
Flight Position: [ source = BAT ]
RA: 234.748127619422 Dec: -66.3082032318706 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 234.506395176746 Dec: -66.3065433813978 [deg; J2000]
{ 15h 38m 01.5s , -66d 18' 23.6" }
+/- 4.1419548125884 [arcmin] (estimated 90% radius based on SNR)
+/- 2.79801705877155 [arcmin] (formal 1-sigma fit error)
SNR: 3.99389315157855
Angular difference between Flight and Ground position is 5.828967 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 4.09599995613098 +/-
Measured from: 0
to: 4.09599995613098 [s; relative to TRIGTIME]
T50: 4.09599995613098 +/-
Measured from: 0
to: 4.09599995613098 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.09599995613098 second)
Measured from: 0
to: 4.09599995613098 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.09599995613098 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.078376 0.028739 0.010630 -0.005471
0.014716 0.011849 0.009677 0.008393 [error]
Peak 0.078376 0.028739 0.010630 -0.005471
0.014716 0.011849 0.009677 0.008393 [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 2.17e-08 1.52e-08 6.96e-09 4.46e-09 4.60e-08 4.83e-08 erg/cm2
Error 6.92e-09 6.27e-09 5.94e-09 8.18e-09 1.67e-08 2.03e-08 erg/cm2
Peak flux Power-law 1.77e-01 6.96e-02 1.60e-02 4.43e-03 2.65e-01 2.67e-01 ph/cm2/s
Error 5.76e-02 2.75e-02 1.32e-02 7.53e-03 7.75e-02 7.83e-02 ph/cm2/s
Fluence Cutoff-PL 2.77e-08 7.78e-09 2.80e-12 6.23e-22 3.55e-08 3.55e-08 erg/cm2
Error 7.85e-09 4.65e-09 2.21e-10 0.00e+00 9.72e-09 9.73e-09 erg/cm2
Peak flux Cutoff-PL 2.20e-01 4.16e-02 8.22e-06 9.55e-16 2.61e-01 2.67e-01 ph/cm2/s
Error 6.39e-02 2.65e-02 5.66e-04 0.00e+00 7.11e-02 0.00e+00 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 3.123 0.772 - - 8.81e-04 5.61e-04 60.920 57
CPL -9.670 0.000 19.7 3.4 2.26e+07 0.00e+00 56.440 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.123 0.772 - - 8.81e-04 5.61e-04 60.920 57
CPL -9.670 0.000 19.7 3.4 2.26e+07 0.00e+00 56.440 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
234.5064 -66.3065 0.0481 28.0 -162.4 0.0964 4.0 TRIG_00503926
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-239.128 -16.128 (delta_t = 223.000 [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 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.12296 ( -0.685295 0.859558 )
Norm@50keV : 8.80968E-04 ( -0.000505893 0.000616707 )
------------------------------------------------------------
# Chi-Squared = 60.92 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.367905e-01
Photon flux (15-150 keV) in 4.096 sec: 0.265309 ( -0.0774326 0.077548 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59952e-08 ( -1.57418e-08 1.76513e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.66995 ( )
Epeak [keV] : 19.7169 ( -3.85597 2.86896 )
Norm@50keV : 2.25978E+07 ( )
------------------------------------------------------------
# Chi-Squared = 56.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 56 degrees of freedom
# Null hypothesis probability = 4.582390e-01
Photon flux (15-150 keV) in 4.096 sec: 0.261119 ( -0.071052 0.071242 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54865e-08 ( -9.75819e-09 9.68462e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.89566 ( 0.606492 4.9579 )
beta : -3.12287 ( -0.858864 0.684921 )
Epeak [keV] : 22.2179 ( -22.2179 -22.2179 )
Norm@50keV : 0.119745 ( -0.068761 0.0838162 )
------------------------------------------------------------
# Chi-Squared = 60.92 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Null hypothesis probability = 2.714281e-01
Photon flux (15-150 keV) in 4.096 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] : 4.33708 (-0.91237 1.28688)
R^2/D10^2 : 4.63153 (-4.63155 11.2817)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 58.91 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.056187e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.519e-08 1.479e-08
25- 50 1.139e-08 7.365e-09
50-150 2.213e-10 2.220e-10
15-150 3.681e-08 2.249e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.7102 (-5.71472 13.6014)
Norm : 5.42916 (-1.55866 1.55866)
------------------------------------------------------------
# Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.604289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.313e-08 2.818e-08
25- 50 1.439e-08 2.699e-08
50-150 2.102e-09 1.108e-08
15-150 3.963e-08 7.105e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.06128 (-4.06348 1.26765)
R1^2/D10^2 : 6.00006 (-5.9941 18.5639)
kT2 [keV] : 18.8322 (-18.9605 -18.9605)
R2^2/D10^2 : 2.80986E-03 (-0.00277084 0.0358925)
------------------------------------------------------------
# Chi-Squared = 57.59 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.795470e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.485e-08 1.465e-08
25- 50 1.291e-08 7.332e-09
50-150 1.013e-08 8.036e-09
15-150 4.789e-08 2.603e-08
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.12296 ( -0.685295 0.859558 )
Norm@50keV : 8.80968E-04 ( -0.000505893 0.000616707 )
------------------------------------------------------------
# Chi-Squared = 60.92 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.367905e-01
Photon flux (15-150 keV) in 4.096 sec: 0.265309 ( -0.0774326 0.077548 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59952e-08 ( -1.57418e-08 1.76513e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.66995 ( )
Epeak [keV] : 19.7169 ( -3.85631 2.86763 )
Norm@50keV : 2.25978E+07 ( )
------------------------------------------------------------
# Chi-Squared = 56.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 56 degrees of freedom
# Null hypothesis probability = 4.582390e-01
Photon flux (15-150 keV) in 4.096 sec: 0.261119 ( -0.071052 0.071242 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54865e-08 ( -9.75819e-09 9.68462e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.89566 ( 0.606492 4.9579 )
beta : -3.12287 ( -0.858864 0.684921 )
Epeak [keV] : 22.2179 ( -22.2179 -22.2179 )
Norm@50keV : 0.119745 ( -0.068761 0.0838162 )
------------------------------------------------------------
# Chi-Squared = 60.92 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Null hypothesis probability = 2.714281e-01
Photon flux (15-150 keV) in 4.096 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] : 4.33708 (-0.91237 1.28688)
R^2/D10^2 : 4.63153 (-4.63155 11.2817)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 58.91 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.056187e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.519e-08 1.496e-08
25- 50 1.139e-08 7.260e-09
50-150 2.213e-10 2.140e-10
15-150 3.681e-08 2.255e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.7102 (-5.71472 13.6014)
Norm : 5.42916 (-1.55866 1.55866)
------------------------------------------------------------
# Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.604289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.313e-08 2.672e-08
25- 50 1.439e-08 2.465e-08
50-150 2.102e-09 1.160e-08
15-150 3.963e-08 6.376e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.06128 (-4.06348 1.26765)
R1^2/D10^2 : 6.00006 (-5.9941 18.5639)
kT2 [keV] : 18.8322 (-18.9605 -18.9605)
R2^2/D10^2 : 2.80986E-03 (-0.00277084 0.0252381)
------------------------------------------------------------
# Chi-Squared = 57.59 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.795470e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.485e-08 1.501e-08
25- 50 1.291e-08 7.346e-09
50-150 1.013e-08 9.628e-09
15-150 4.789e-08 2.757e-08
Plot creation:
Sun Sep 25 02:24:34 EDT 2011