batgrbproduct Analysis for Trigger=597570
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): Tue Apr 29 19:11:36 EDT 2014
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger597570/GCN5_download_cron
======================================================================
Trigger: 00597570 Segment: 000
BAT Trigger Time: 420470020.416 [s; MET]
Trigger Stop: 420470020.432 [s; MET]
UTC: 2014-04-29T13:13:28.468540 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 272.159291950148 Dec: -20.4036481092704 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 14.7
Image Trigger?: NO
Rate S/N Ratio: 71.7425954367418 [ if not an image trigger ]
Image S/N Ratio: 14.7
Flight Position: [ source = BAT ]
RA: 272.159291950148 Dec: -20.4036481092704 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.159755930618 Dec: -20.4108722255144 [deg; J2000]
{ 18h 08m 38.3s , -20d 24' 39.1" }
+/- 1.2646849725318 [arcmin] (estimated 90% radius based on SNR)
+/- 0.434650706746377 [arcmin] (formal 1-sigma fit error)
SNR: 21.7484994000738
Angular difference between Flight and Ground position is 0.434232 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.175999939441681 +/- 0.0533666929262319
Measured from: -0.00799989700317383
to: 0.168000042438507 [s; relative to TRIGTIME]
T50: 0.0479999184608459 +/- 0.0126491362748289
Measured from: 0.00400012731552124
to: 0.0520000457763672 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.396000027656555
to: 0.603999972343445 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0199999809265137
to: 0.223999977111816 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.072108 0.074726 0.021044 0.004262
0.004697 0.004563 0.002855 0.001961 [error]
Peak 0.080281 0.083381 0.025915 0.003854
0.007512 0.006851 0.005078 0.004231 [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 2.31e-08 2.53e-08 1.97e-08 2.52e-08 7.75e-08 9.33e-08 erg/cm2
Error 2.36e-09 1.95e-09 2.54e-09 6.14e-09 6.40e-09 9.69e-09 erg/cm2
Peak flux Power-law 7.84e-01 5.31e-01 2.35e-01 1.44e-01 1.62e+00 1.69e+00 ph/cm2/s
Error 1.11e-01 5.48e-02 4.05e-02 4.59e-02 1.68e-01 1.74e-01 ph/cm2/s
Fluence Cutoff-PL 2.11e-08 2.98e-08 1.74e-08 3.41e-09 7.12e-08 7.17e-08 erg/cm2
Error 2.65e-09 3.04e-09 3.67e-09 3.95e-09 6.84e-09 7.78e-09 erg/cm2
Peak flux Cutoff-PL 7.10e-01 6.23e-01 2.03e-01 2.03e-02 1.55e+00 1.56e+00 ph/cm2/s
Error 1.26e-01 8.25e-02 5.78e-02 3.56e-02 1.72e-01 1.74e-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 2.360 0.134 - - 3.29e-02 3.19e-03 73.940 57
CPL 0.923 0.858 29.2 8.2 2.42e-01 4.71e-01 61.320 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.176 0.187 - - 9.91e-03 1.31e-03 59.210 57
CPL 0.643 1.200 33.3 8.8 8.65e-02 3.14e-01 51.970 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: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.244 -0.020 0.224
T90 0.176 -0.008 0.168
T50 0.048 0.004 0.052
Peak 1.000 -0.396 0.604
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.1598 -20.4109 0.0089 14.4 -9.3 0.1704 21.7 TRIG_00597570
------------------------------------------
Foreground time interval of the image:
-0.020 0.224 (delta_t = 0.244 [sec])
Background time interval of the image:
-48.115 -0.020 (delta_t = 48.095 [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 -0.020 sec. to 0.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36009 ( -0.131364 0.137451 )
Norm@50keV : 3.28501E-02 ( -0.00320912 0.00316494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.94 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 57 degrees of freedom
# Null hypothesis probability = 6.511500e-02
Photon flux (15-150 keV) in 0.244 sec: 5.93914 ( -0.462722 0.463162 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.7509e-08 ( -6.38165e-09 6.41537e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.020 sec. to 0.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.922874 ( -0.954103 0.76146 )
Epeak [keV] : 29.1836 ( -11.3918 5.0993 )
Norm@50keV : 0.241590 ( -0.24209 0.700653 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.32 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 56 degrees of freedom
# Null hypothesis probability = 2.912472e-01
Photon flux (15-150 keV) in 0.244 sec: 5.75778 ( -0.47345 0.47358 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11843e-08 ( -6.68877e-09 6.98865e-09 ) ergs/cm2
Band function
Time interval is from -0.020 sec. to 0.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.733982 ( -1.24098 -0.0240555 )
beta : -2.95576 ( -1.18179 0.40867 )
Epeak [keV] : 28.6908 ( -4.28434 4.16381 )
Norm@50keV : 3.52169 ( -3.43131 2079.83 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.74 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.744377e-01
Photon flux (15-150 keV) in 0.244 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] : 8.48949 (-0.608909 0.653785)
R^2/D10^2 : 5.29911 (-1.4216 1.93361)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.24 using 59 PHA bins.
# Reduced chi-squared = 1.337 for 57 degrees of freedom
# Null hypothesis probability = 4.529001e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.755e-08 2.180e-09
25- 50 3.396e-08 2.855e-09
50-150 1.080e-08 2.262e-09
15-150 6.231e-08 5.295e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.2402 (-6.13564 7.68224)
Norm : 38.8270 (-5.33631 6.18364)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.92 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.049717e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.180e-08 2.080e-09
25- 50 2.875e-08 2.391e-09
50-150 2.239e-08 4.717e-09
15-150 7.294e-08 6.112e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.91249 (-1.4185 1.07613)
R1^2/D10^2 : 10.3138 (-4.06184 10.4333)
kT2 [keV] : 21.4749 (-8.42293 25.0769)
R2^2/D10^2 : 4.96106E-02 (-0.0461754 0.470842)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.46 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.495460e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.011e-08 3.935e-09
25- 50 3.092e-08 6.256e-09
50-150 2.277e-08 1.040e-08
15-150 7.380e-08 1.869e-08
Peak spectrum fit
Power-law model
Time interval is from -0.396 sec. to 0.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17602 ( -0.18226 0.19109 )
Norm@50keV : 9.90878E-03 ( -0.00131935 0.00129889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.21 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.948015e-01
Photon flux (15-150 keV) in 1 sec: 1.62004 ( -0.167671 0.167768 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.28606e-08 ( -1.08963e-08 1.10785e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.396 sec. to 0.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.642814 ( -1.36833 1.03128 )
Epeak [keV] : 33.2822 ( -11.0313 6.59167 )
Norm@50keV : 8.65075E-02 ( -0.0865467 0.541406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.97 using 59 PHA bins.
# Reduced chi-squared = 0.9280 for 56 degrees of freedom
# Null hypothesis probability = 6.282389e-01
Photon flux (15-150 keV) in 1 sec: 1.55410 ( -0.17191 0.17259 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12329e-08 ( -1.10782e-08 1.24601e-08 ) ergs/cm2
Band function
Time interval is from -0.396 sec. to 0.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.547419 ( -1.40418 -0.0423218 )
beta : -2.86155 ( 2.89851 0.577267 )
Epeak [keV] : 30.7903 ( -7.95187 6.46138 )
Norm@50keV : 0.595232 ( -0.583822 574.605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.15 using 59 PHA bins.
# Reduced chi-squared = 0.9118 for 55 degrees of freedom
# Null hypothesis probability = 6.601387e-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] : 8.74403 (-0.872391 0.9795)
R^2/D10^2 : 1.29088 (-0.453757 0.688607)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.46 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.213855e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.892e-08 3.340e-09
25- 50 3.841e-08 4.865e-09
50-150 1.340e-08 3.936e-09
15-150 7.073e-08 9.540e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.9869 (-10.47 15.6357)
Norm : 9.62331 (-1.61765 2.04475)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.98 using 59 PHA bins.
# Reduced chi-squared = 0.9295 for 57 degrees of freedom
# Null hypothesis probability = 6.266333e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.318e-08 3.210e-09
25- 50 3.254e-08 3.775e-09
50-150 2.976e-08 8.440e-09
15-150 8.547e-08 1.118e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.30058 (-2.51025 1.44398)
R1^2/D10^2 : 2.28282 (-1.05974 4.9423)
kT2 [keV] : 25.2714 (-20.6071 -25.3996)
R2^2/D10^2 : 8.26027E-03 (-0.00806414 0.189549)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.14 using 59 PHA bins.
# Reduced chi-squared = 0.9117 for 55 degrees of freedom
# Null hypothesis probability = 6.603190e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.129e-08 6.685e-09
25- 50 3.543e-08 1.169e-08
50-150 3.039e-08 1.619e-08
15-150 8.711e-08 3.016e-08
Plot creation:
Tue Apr 29 19:39:26 EDT 2014