batgrbproduct Analysis for Trigger=516571
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): Thu Mar 1 10:28:37 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger516571/GCN5_download_cron
======================================================================
Trigger: 00516571 Segment: 000
BAT Trigger Time: 352218919.104 [s; MET]
Trigger Stop: 352218919.36 [s; MET]
UTC: 2012-02-29T14:35:11.161400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 20.0351563795243 Dec: -35.8075827980141 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.66
Image Trigger?: NO
Rate S/N Ratio: 19.6977156035922 [ if not an image trigger ]
Image S/N Ratio: 9.66
Flight Position: [ source = BAT ]
RA: 20.0351563795243 Dec: -35.8075827980141 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 20.0328426888956 Dec: -35.7970367738224 [deg; J2000]
{ 01h 20m 07.9s , -35d 47' 49.3" }
+/- 1.92176848070199 [arcmin] (estimated 90% radius based on SNR)
+/- 1.04036633067413 [arcmin] (formal 1-sigma fit error)
SNR: 11.9627531887393
Angular difference between Flight and Ground position is 0.642700 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 0.223999917507172 +/- 0.0312410162257869
Measured from: 0.0280001759529114
to: 0.252000093460083 [s; relative to TRIGTIME]
T50: 0.163999915122986 +/- 0.0322490445964129
Measured from: 0.048000156879425
to: 0.212000072002411 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.357999980449677
to: 0.642000019550323 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0120000243186951
to: 0.26800000667572 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.013814 0.024899 0.019941 0.007162
0.002944 0.003245 0.003086 0.002437 [error]
Peak 0.017664 0.027383 0.019825 0.006709
0.005134 0.005510 0.005058 0.004017 [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 4.33e-09 9.00e-09 1.46e-08 5.35e-08 4.05e-08 8.14e-08 erg/cm2
Error 1.10e-09 1.46e-09 2.72e-09 2.08e-08 6.88e-09 2.29e-08 erg/cm2
Peak flux Power-law 1.49e-01 1.70e-01 1.39e-01 1.90e-01 5.26e-01 6.47e-01 ph/cm2/s
Error 6.22e-02 4.52e-02 3.95e-02 1.11e-01 1.28e-01 1.63e-01 ph/cm2/s
Fluence Cutoff-PL 3.62e-09 9.75e-09 1.60e-08 1.95e-08 4.89e-08 0.00e+00 erg/cm2
Error 1.25e-09 1.74e-09 3.22e-09 2.26e-08 2.33e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.31e-01 1.80e-01 1.48e-01 9.67e-02 5.15e-01 5.56e-01 ph/cm2/s
Error 7.05e-02 5.28e-02 4.60e-02 1.48e-01 1.29e-01 1.93e-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 5.68e-01 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 1.299 0.241 - - 1.60e-02 2.45e-03 73.210 57
CPL 0.455 0.939 97.1 536.7 4.11e-02 5.34e-02 70.240 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.290 0.399 - - 4.42e-03 1.07e-03 75.200 57
CPL 0.621 1.362 107.2 0.0 9.44e-03 3.01e-02 74.440 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.256 0.012 0.268
T90 0.224 0.028 0.252
T50 0.164 0.048 0.212
Peak 1.000 -0.358 0.642
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
20.0328 -35.7970 0.0161 25.9 -150.2 0.0690 12.0 TRIG_00516571
------------------------------------------
Foreground time interval of the image:
0.012 0.268 (delta_t = 0.256 [sec])
Background time interval of the image:
-127.803 -57.097 (delta_t = 70.707 [sec])
-56.104 0.012 (delta_t = 56.116 [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 0.012 sec. to 0.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29902 ( -0.240608 0.241251 )
Norm@50keV : 1.59865E-02 ( -0.00245216 0.00244764 )
------------------------------------------------------------
# Chi-Squared = 73.21 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 57 degrees of freedom
# Null hypothesis probability = 7.277869e-02
Photon flux (15-150 keV) in 0.256 sec: 1.90690 ( -0.293921 0.294288 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.04511e-08 ( -6.84163e-09 6.9204e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 0.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.455108 ( -1.0325 0.845165 )
Epeak [keV] : 97.0885 ( -32.1605 1041.19 )
Norm@50keV : 4.11160E-02 ( -0.0246387 0.0821148 )
------------------------------------------------------------
# Chi-Squared = 70.24 using 59 PHA bins.
# Reduced chi-squared = 1.254 for 56 degrees of freedom
# Null hypothesis probability = 9.543611e-02
Photon flux (15-150 keV) in 0.256 sec: 1.86713 ( -0.29593 0.29667 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.88594e-08 ( -1.38775e-08 3.28049e-08 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 0.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.457124 ( 0.770009 1.3348 )
beta : -10.00000 ( 6.29775e+10 6.29775e+10 )
Epeak [keV] : 97.1972 ( -30.784 1052.51 )
Norm@50keV : 4.10224E-02 ( -0.0246471 0.0821681 )
------------------------------------------------------------
# Chi-Squared = 70.24 using 59 PHA bins.
# Reduced chi-squared = 1.277 for 55 degrees of freedom
# Null hypothesis probability = 8.080783e-02
Photon flux (15-150 keV) in 0.256 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] : 18.1694 (-3.53816 4.15474)
R^2/D10^2 : 0.122366 (-0.0605296 0.128645)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 77.86 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 57 degrees of freedom
# Null hypothesis probability = 3.459926e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.064e-09 6.638e-10
25- 50 9.614e-09 2.639e-09
50-150 2.309e-08 6.643e-09
15-150 3.477e-08 8.362e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 7.88847 (-7.88847 -7.88847)
------------------------------------------------------------
# Chi-Squared = 74.55 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 57 degrees of freedom
# Null hypothesis probability = 5.924342e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.028e-09 2.772e-09
25- 50 9.671e-09 5.341e-09
50-150 2.121e-08 1.167e-08
15-150 3.591e-08 1.983e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.55066 (-2.37732 3.15861)
R1^2/D10^2 : 1.28285 (-0.884196 1.9431)
kT2 [keV] : 27.2108 (-6.8281 13.603)
R2^2/D10^2 : 2.53375E-02 (-0.0190155 0.0465292)
------------------------------------------------------------
# Chi-Squared = 67.44 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 55 degrees of freedom
# Null hypothesis probability = 1.211800e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.028e-09 2.203e-09
25- 50 9.811e-09 5.192e-09
50-150 2.651e-08 1.478e-08
15-150 4.035e-08 2.140e-08
Peak spectrum fit
Power-law model
Time interval is from -0.358 sec. to 0.642 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29024 ( -0.401188 0.396174 )
Norm@50keV : 4.41713E-03 ( -0.00106643 0.00106393 )
------------------------------------------------------------
# Chi-Squared = 75.20 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 57 degrees of freedom
# Null hypothesis probability = 5.345842e-02
Photon flux (15-150 keV) in 1 sec: 0.526043 ( -0.128214 0.128568 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.3754e-08 ( -1.15979e-08 1.18392e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.358 sec. to 0.642 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.620776 ( -1.72097 1.00249 )
Epeak [keV] : 107.193 ( -107.15 -107.15 )
Norm@50keV : 9.43742E-03 ( -0.00591026 0.0542823 )
------------------------------------------------------------
# Chi-Squared = 74.44 using 59 PHA bins.
# Reduced chi-squared = 1.329 for 56 degrees of freedom
# Null hypothesis probability = 5.023771e-02
Photon flux (15-150 keV) in 1 sec: 0.514905 ( -0.128477 0.130237 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.20903e-08 ( -1.22606e-08 1.2368e-08 ) ergs/cm2
Band function
Time interval is from -0.358 sec. to 0.642 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.13872 ( 0.771283 1.86336 )
beta : -1.66955 ( 10 20 )
Epeak [keV] : 41.8195 ( -55.8016 344.066 )
Norm@50keV : 0.604870 ( -0.591096 62.0861 )
------------------------------------------------------------
# Chi-Squared = 73.86 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 55 degrees of freedom
# Null hypothesis probability = 4.573089e-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] : 17.8087 (-5.92468 8.0168)
R^2/D10^2 : 3.50991E-02 (-0.0244983 0.100956)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 78.16 using 59 PHA bins.
# Reduced chi-squared = 1.371 for 57 degrees of freedom
# Null hypothesis probability = 3.288033e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.236e-09 1.226e-09
25- 50 1.026e-08 5.679e-09
50-150 2.355e-08 1.167e-08
15-150 3.605e-08 1.848e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-35.8983 -199.954)
Norm : 2.17713 (-0.52612 0.526115)
------------------------------------------------------------
# Chi-Squared = 75.88 using 59 PHA bins.
# Reduced chi-squared = 1.331 for 57 degrees of freedom
# Null hypothesis probability = 4.795373e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.421e-09 3.179e-09
25- 50 1.043e-08 5.985e-09
50-150 2.287e-08 1.351e-08
15-150 3.872e-08 2.268e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.85564 (-3.57641 5.11463)
R1^2/D10^2 : 0.341238 (-0.270188 1.46768)
kT2 [keV] : 29.9200 (-25.8678 63.088)
R2^2/D10^2 : 4.94430E-03 (-0.00450556 0.0226536)
------------------------------------------------------------
# Chi-Squared = 72.97 using 59 PHA bins.
# Reduced chi-squared = 1.327 for 55 degrees of freedom
# Null hypothesis probability = 5.283017e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.449e-09 2.641e-09
25- 50 1.064e-08 5.780e-09
50-150 2.863e-08 1.700e-08
15-150 4.372e-08 2.264e-08
Plot creation:
Thu Mar 1 10:49:14 EST 2012