batgrbproduct Analysis for Trigger=457553
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): Fri Jul 22 13:42:25 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger457553/batgroup_hand_proc
======================================================================
Trigger: 00457553 Segment: 000
BAT Trigger Time: 332748559.04 [s; MET]
Trigger Stop: 332748562.112 [s; MET]
UTC: 2011-07-19T06:09:11.868540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 24.5635253949573 Dec: 34.5721395739793 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.49
Image Trigger?: NO
Rate S/N Ratio: 10.295630140987 [ if not an image trigger ]
Image S/N Ratio: 7.49
Flight Position: [ source = BAT ]
RA: 24.5635253949573 Dec: 34.5721395739793 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 24.5833128547856 Dec: 34.5764651394756 [deg; J2000]
{ 01h 38m 20.0s , +34d 34' 35.3" }
+/- 1.63746290269732 [arcmin] (estimated 90% radius based on SNR)
+/- 0.653082692696303 [arcmin] (formal 1-sigma fit error)
SNR: 15.0369286007233
Angular difference between Flight and Ground position is 1.011434 arcmin
Partial Coding Fraction: 0.3085938 [ including projection effects ]
Duration
T90: 64 +/- 35.7770876399966
Measured from: 0.959999978542328
to: 64.9599999785423 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.959999978542328
to: 16.9599999785423 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.45999997854233
to: 9.45999997854233 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.959999978542328
to: 80.9599999785423 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.976974 1.159498 0.540690 0.059381
0.093868 0.095178 0.087695 0.083041 [error]
Peak 0.015329 0.035049 0.028316 -0.013632
0.012332 0.012535 0.011614 0.010304 [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 3.73e-07 4.94e-07 4.80e-07 8.33e-07 1.62e-06 2.18e-06 erg/cm2
Error 5.31e-08 4.93e-08 8.39e-08 2.88e-07 1.92e-07 3.80e-07 erg/cm2
Peak flux Power-law 2.16e-01 2.23e-01 1.61e-01 1.87e-01 6.73e-01 7.88e-01 ph/cm2/s
Error 1.66e-01 1.67e-01 6.64e-02 2.34e-01 3.22e-01 3.67e-01 ph/cm2/s
Fluence Cutoff-PL 3.61e-07 5.21e-07 4.66e-07 3.68e-07 1.54e-06 1.72e-06 erg/cm2
Error 5.82e-08 6.83e-08 9.90e-08 5.39e-07 2.32e-07 5.78e-07 erg/cm2
Peak flux Cutoff-PL 1.82e-01 2.48e-01 1.75e-01 6.69e-02 6.53e-01 6.71e-01 ph/cm2/s
Error 1.92e-01 1.74e-01 1.42e-01 1.28e-01 3.22e-01 3.85e-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 2.042 0.192 - - 2.19e-03 2.77e-04 45.570 57
CPL 1.593 0.753 37.0 -1.4 4.02e-03 0.00e+00 44.610 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.463 0.801 - - 5.44e-03 2.54e-03 43.090 57
CPL 0.389 6.006 73.5 0.0 1.95e-02 0.00e+00 42.640 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: 23.360000 sec.
T50 in the 50-300 keV band: 14.400000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 80.000 0.960 80.960
T90 64.000 0.960 64.960
T50 16.000 0.960 16.960
Peak 1.000 8.460 9.460
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
24.5833 34.5765 0.0129 43.5494 166.9525 2.4207707 15.037 TRIG_00457553
Foreground time interval of the image:
0.960 40.061 (delta_t = 39.101 [sec])
Background time interval of the image:
-239.040 0.960 (delta_t = 240.000 [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 0.960 sec. to 80.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04180 ( -0.186549 0.196746 )
Norm@50keV : 2.19279E-03 ( -0.000280613 0.00027433 )
------------------------------------------------------------
# Chi-Squared = 45.57 using 59 PHA bins.
# Reduced chi-squared = 0.7995 for 57 degrees of freedom
# Null hypothesis probability = 8.617788e-01
Photon flux (15-150 keV) in 80 sec: 0.335403 ( -0.0334221 0.0334388 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62192e-06 ( -1.90207e-07 1.93938e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.960 sec. to 80.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59307 ( -0.970431 0.536526 )
Epeak [keV] : 37.0492 ( -34.2648 -37.0476 )
Norm@50keV : 4.01521E-03 ( )
------------------------------------------------------------
# Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.7965 for 56 degrees of freedom
# Null hypothesis probability = 8.633762e-01
Photon flux (15-150 keV) in 80 sec: 0.329305 ( -0.035125 0.03499 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54358e-06 ( -2.3052e-07 2.34376e-07 ) ergs/cm2
Band function
Time interval is from 0.960 sec. to 80.960 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59417 ( 1.97299 0.0804408 )
beta : -10.00000 ( 2.76706e+14 2.76706e+14 )
Epeak [keV] : 37.0401 ( -36.3071 -37.0403 )
Norm@50keV : 4.00820E-03 ( -0.00193948 0.0111912 )
------------------------------------------------------------
# Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.8110 for 55 degrees of freedom
# Null hypothesis probability = 8.405591e-01
Photon flux (15-150 keV) in 80 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] : 9.12634 (-1.03387 1.18606)
R^2/D10^2 : 0.217891 (-0.0828274 0.131858)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 60.82 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 57 degrees of freedom
# Null hypothesis probability = 3.402417e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.847e-07 5.256e-08
25- 50 6.183e-07 8.004e-08
50-150 2.461e-07 7.196e-08
15-150 1.149e-06 1.500e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.8125 (-16.2348 25.7187)
Norm : 1.73941 (-0.284515 0.339496)
------------------------------------------------------------
# Chi-Squared = 44.81 using 59 PHA bins.
# Reduced chi-squared = 0.7861 for 57 degrees of freedom
# Null hypothesis probability = 8.793478e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.505e-07 4.856e-08
25- 50 5.356e-07 6.348e-08
50-150 6.163e-07 1.648e-07
15-150 1.502e-06 2.004e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.97314 (-1.4237 1.36567)
R1^2/D10^2 : 0.522715 (-0.24508 0.62816)
kT2 [keV] : 29.2627 (-11.8938 53.5428)
R2^2/D10^2 : 1.57973E-03 (-0.00147843 0.00628376)
------------------------------------------------------------
# Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7592 for 55 degrees of freedom
# Null hypothesis probability = 9.059249e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.425e-07 9.376e-08
25- 50 5.472e-07 1.607e-07
50-150 7.130e-07 3.877e-07
15-150 1.603e-06 5.369e-07
Peak spectrum fit
Power-law model
Time interval is from 8.460 sec. to 9.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46346 ( -0.804319 0.797967 )
Norm@50keV : 5.44429E-03 ( -0.0025477 0.00252768 )
------------------------------------------------------------
# Chi-Squared = 43.09 using 59 PHA bins.
# Reduced chi-squared = 0.7559 for 57 degrees of freedom
# Null hypothesis probability = 9.136141e-01
Photon flux (15-150 keV) in 1 sec: 0.673265 ( -0.31956 0.324036 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19633e-08 ( -2.52972e-08 2.60998e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.460 sec. to 9.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.388651 ( -6.82473 5.18633 )
Epeak [keV] : 73.4947 ( -73.5252 -73.5252 )
Norm@50keV : 1.95242E-02 ( -0.0194696 -0.0194696 )
------------------------------------------------------------
# Chi-Squared = 42.64 using 59 PHA bins.
# Reduced chi-squared = 0.7615 for 56 degrees of freedom
# Null hypothesis probability = 9.057255e-01
Photon flux (15-150 keV) in 1 sec: 0.652705 ( -0.316091 0.327068 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.85663e-08 ( -4.85663e-08 2.76428e-08 ) ergs/cm2
Band function
Time interval is from 8.460 sec. to 9.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.423023 ( -2.13591 3.40117 )
beta : -9.37071 ( 9.99882 9.99882 )
Epeak [keV] : 75.2438 ( -42.9854 259.742 )
Norm@50keV : 1.84940E-02 ( -0.0189677 0.0208611 )
------------------------------------------------------------
# Chi-Squared = 42.64 using 59 PHA bins.
# Reduced chi-squared = 0.7753 for 55 degrees of freedom
# Null hypothesis probability = 8.878548e-01
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] : 14.2049 (-6.73818 15.1313)
R^2/D10^2 : 9.58351E-02 (-0.0924095 0.841919)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 43.41 using 59 PHA bins.
# Reduced chi-squared = 0.7615 for 57 degrees of freedom
# Null hypothesis probability = 9.078457e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.079e-09 2.872e-09
25- 50 1.539e-08 1.011e-08
50-150 2.060e-08 1.524e-08
15-150 4.007e-08 2.732e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-199.926 -199.926)
Norm : 2.80856 (-1.2872 1.90958)
------------------------------------------------------------
# Chi-Squared = 42.90 using 59 PHA bins.
# Reduced chi-squared = 0.7526 for 57 degrees of freedom
# Null hypothesis probability = 9.169330e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.994e-09 4.504e-09
25- 50 1.345e-08 8.805e-09
50-150 2.950e-08 1.869e-08
15-150 4.995e-08 3.368e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.14839 (-8.21322 -8.21322)
R1^2/D10^2 : 0.463162 (-0.457923 -0.457923)
kT2 [keV] : 28.0254 (-28.1335 -28.1335)
R2^2/D10^2 : 6.16991E-03 (-0.00607226 0.501537)
------------------------------------------------------------
# Chi-Squared = 42.09 using 59 PHA bins.
# Reduced chi-squared = 0.7652 for 55 degrees of freedom
# Null hypothesis probability = 8.994779e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.425e-09 4.331e-09
25- 50 1.491e-08 1.018e-08
50-150 2.971e-08 1.735e-08
15-150 5.105e-08 2.903e-08
Plot creation:
Fri Jul 22 15:57:36 EDT 2011