batgrbproduct Analysis for Trigger=456505
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): Sat Jul 2 23:06:32 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger456505/GCN5_download_cron
======================================================================
Trigger: 00456505 Segment: 000
BAT Trigger Time: 331288725.992 [s; MET]
Trigger Stop: 331288726.008 [s; MET]
UTC: 2011-07-02T08:38:38.877060 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.313731476258 Dec: -4.94824023750262 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 15.66
Image Trigger?: NO
Rate S/N Ratio: 106.686456497533 [ if not an image trigger ]
Image S/N Ratio: 15.66
Flight Position: [ source = BAT ]
RA: 280.313731476258 Dec: -4.94824023750262 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.349053362279 Dec: -4.95260952317093 [deg; J2000]
{ 18h 41m 23.8s , -04d 57' 09.4" }
+/- 1.24250278691495 [arcmin] (estimated 90% radius based on SNR)
+/- 0.629802061464369 [arcmin] (formal 1-sigma fit error)
SNR: 22.3052887257466
Angular difference between Flight and Ground position is 2.127620 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0359999537467957 +/- 0.0119999647140503
Measured from: -0.00399988889694214
to: 0.0320000648498535 [s; relative to TRIGTIME]
T50: 0.0079999566078186 +/- 0.00565686571343518
Measured from: 0.00400012731552124
to: 0.0120000839233398 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.477999985218048
to: 0.522000014781952 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.0440000295639038 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.040649 0.053529 0.017827 0.001932
0.003213 0.003565 0.002236 0.001010 [error]
Peak 0.046464 0.061796 0.025293 0.011111
0.006669 0.006806 0.005599 0.004722 [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 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 Power-law 4.69e-01 3.63e-01 1.89e-01 1.41e-01 1.08e+00 1.16e+00 ph/cm2/s
Error 9.16e-02 5.12e-02 4.26e-02 5.97e-02 1.53e-01 1.66e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 3.88e-01 4.49e-01 1.73e-01 1.58e-02 1.02e+00 1.03e+00 ph/cm2/s
Error 1.11e-01 7.80e-02 5.54e-02 3.34e-02 1.56e-01 1.58e-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 2.882 0.000 - - 5.99e-02 0.00e+00 166.950 57
CPL -1.436 0.888 33.8 2.5 2.15e+01 3.94e+01 67.730 56
The chi2 of BB fit is 67.54 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.945 0.248 - - 7.41e-03 1.29e-03 75.790 57
CPL -0.098 1.666 41.5 9.4 1.16e-01 7.61e-01 69.280 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.048 -0.004 0.044
T90 0.036 -0.004 0.032
T50 0.008 0.004 0.012
Peak 1.000 -0.478 0.522
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.3491 -4.9526 0.0086 4.5 96.1 0.1185 22.3 TRIG_00456505
------------------------------------------
Foreground time interval of the image:
-0.004 0.044 (delta_t = 0.048 [sec])
Background time interval of the image:
-239.992 -0.004 (delta_t = 239.988 [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 -0.004 sec. to 0.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.88168 ( )
Norm@50keV : 5.98672E-02 ( )
------------------------------------------------------------
# Chi-Squared = 166.95 using 59 PHA bins.
# Reduced chi-squared = 2.9290 for 57 degrees of freedom
# Null hypothesis probability = 1.001760e-12
Photon flux (15-150 keV) in 0.048 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.43594 ( -0.953019 0.822609 )
Epeak [keV] : 33.7868 ( -2.62364 2.39667 )
Norm@50keV : 21.5001 ( -21.5051 57.2885 )
------------------------------------------------------------
# Chi-Squared = 67.73 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 56 degrees of freedom
# Null hypothesis probability = 1.353225e-01
Photon flux (15-150 keV) in 0.048 sec: 17.5825 ( -1.5546 1.5566 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.43677 ( -0.65804 1.20671 )
beta : -9.99869 ( 2415.97 2425.97 )
Epeak [keV] : 33.7773 ( -2.62233 2.39582 )
Norm@50keV : 21.5416 ( -21.5431 57.4404 )
------------------------------------------------------------
# Chi-Squared = 67.74 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 55 degrees of freedom
# Null hypothesis probability = 1.161511e-01
Photon flux (15-150 keV) in 0.048 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] : 8.80774 (-0.555977 0.545521)
R^2/D10^2 : 15.3911 (-3.48036 4.70715)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.54 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 57 degrees of freedom
# Null hypothesis probability = 1.601204e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.103e-08 1.320e-09
25- 50 2.266e-08 2.165e-09
50-150 8.087e-09 1.757e-09
15-150 4.177e-08 4.078e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.2801 (-2.92898 3.12851)
Norm : 151.439 (-19.7772 21.9486)
------------------------------------------------------------
# Chi-Squared = 106.15 using 59 PHA bins.
# Reduced chi-squared = 1.8624 for 57 degrees of freedom
# Null hypothesis probability = 8.445002e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.434e-08 1.524e-09
25- 50 1.584e-08 1.490e-09
50-150 8.018e-09 1.668e-09
15-150 3.820e-08 3.734e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.12623 (-3.12772 11.1811)
R1^2/D10^2 : 116.149 (-115.982 2390.91)
kT2 [keV] : 9.02800 (-0.664725 -9.02834)
R2^2/D10^2 : 13.4010 (-13.398 5.86751)
------------------------------------------------------------
# Chi-Squared = 66.77 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 55 degrees of freedom
# Null hypothesis probability = 1.326718e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.156e-08 3.598e-09
25- 50 2.206e-08 5.446e-09
50-150 8.410e-09 2.251e-09
15-150 4.204e-08 9.298e-09
Peak spectrum fit
Power-law model
Time interval is from -0.478 sec. to 0.522 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94497 ( -0.239254 0.256044 )
Norm@50keV : 7.41392E-03 ( -0.00130359 0.00127388 )
------------------------------------------------------------
# Chi-Squared = 75.79 using 59 PHA bins.
# Reduced chi-squared = 1.330 for 57 degrees of freedom
# Null hypothesis probability = 4.871473e-02
Photon flux (15-150 keV) in 1 sec: 1.08487 ( -0.152898 0.152919 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.822e-08 ( -1.14046e-08 1.17173e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.478 sec. to 0.522 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.82303E-02 ( -1.90013 1.4309 )
Epeak [keV] : 41.5264 ( -7.2528 11.4635 )
Norm@50keV : 0.115892 ( -0.117715 1.40492 )
------------------------------------------------------------
# Chi-Squared = 69.28 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 56 degrees of freedom
# Null hypothesis probability = 1.094904e-01
Photon flux (15-150 keV) in 1 sec: 1.02409 ( -0.155908 0.15695 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83035e-08 ( -1.03372e-08 1.21377e-08 ) ergs/cm2
Band function
Time interval is from -0.478 sec. to 0.522 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.130542 ( -1.42918 2.99723 )
beta : -3.91541 ( 3.99004 1.71144 )
Epeak [keV] : 41.5423 ( -9.72937 8.39868 )
Norm@50keV : 0.120533 ( -0.071522 13.7781 )
------------------------------------------------------------
# Chi-Squared = 69.12 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 55 degrees of freedom
# Null hypothesis probability = 9.545019e-02
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] : 10.4128 (-1.33707 1.5399)
R^2/D10^2 : 0.463394 (-0.191335 0.318193)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 70.91 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 57 degrees of freedom
# Null hypothesis probability = 1.018067e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.036e-08 2.668e-09
25- 50 2.725e-08 5.510e-09
50-150 1.597e-08 5.808e-09
15-150 5.358e-08 1.069e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 67.1829 (-21.8986 41.6751)
Norm : 5.51295 (-1.09141 1.32989)
------------------------------------------------------------
# Chi-Squared = 71.92 using 59 PHA bins.
# Reduced chi-squared = 1.262 for 57 degrees of freedom
# Null hypothesis probability = 8.808283e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.408e-08 2.405e-09
25- 50 2.215e-08 4.030e-09
50-150 2.758e-08 1.101e-08
15-150 6.380e-08 1.384e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.77453 (-1.45381 7.0489)
R1^2/D10^2 : 865.945 (-880.834 -881.133)
kT2 [keV] : 11.0714 (-1.54961 -11.0669)
R2^2/D10^2 : 0.352273 (-0.347748 0.164765)
------------------------------------------------------------
# Chi-Squared = 67.67 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Null hypothesis probability = 1.172881e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.166e-08 3.479e-09
25- 50 2.580e-08 8.285e-09
50-150 1.792e-08 7.357e-09
15-150 5.538e-08 1.409e-08
Plot creation:
Tue Jul 5 11:49:59 EDT 2011