batgrbproduct Analysis for Trigger=657750
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): Wed Oct 7 09:09:22 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger657750
======================================================================
Trigger: 00657750 Segment: 000
BAT Trigger Time: 465818117.12 [s; MET]
Trigger Stop: 465818118.144 [s; MET]
UTC: 2015-10-06T09:55:01.886520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 147.451471925599 Dec: 70.5086429872937 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.58
Image Trigger?: NO
Rate S/N Ratio: 47.1911008559877 [ if not an image trigger ]
Image S/N Ratio: 16.58
Flight Position: [ source = BAT ]
RA: 147.451471925599 Dec: 70.5086429872937 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 147.42611563476 Dec: 70.5083980175362 [deg; J2000]
{ 09h 49m 42.3s , +70d 30' 30.2" }
+/- 0.604059197257891 [arcmin] (estimated 90% radius based on SNR)
+/- 0.111979009988196 [arcmin] (formal 1-sigma fit error)
SNR: 62.4973999163192
Angular difference between Flight and Ground position is 0.507846 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 203.888000011444 +/- 41.6406355071822
Measured from: -1.68000000715256
to: 202.208000004292 [s; relative to TRIGTIME]
T50: 55.4240000247955 +/- 3.1984396233763
Measured from: 5.95200002193451
to: 61.37600004673 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.49199998378754
to: 2.49199998378754 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.87999999523163
to: 311.167999982834 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.615501 4.329044 3.212612 0.812372
0.106930 0.108084 0.096733 0.087830 [error]
Peak 0.090219 0.128110 0.102991 0.021787
0.007150 0.008104 0.007381 0.006044 [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 9.97e-07 1.76e-06 2.38e-06 6.64e-06 6.91e-06 1.18e-05 erg/cm2
Error 6.02e-08 6.02e-08 9.84e-08 6.26e-07 2.33e-07 6.84e-07 erg/cm2
Peak flux Power-law 8.16e-01 8.67e-01 6.53e-01 7.98e-01 2.64e+00 3.13e+00 ph/cm2/s
Error 9.53e-02 6.35e-02 5.88e-02 1.45e-01 1.84e-01 2.29e-01 ph/cm2/s
Fluence Cutoff-PL 9.81e-07 1.77e-06 2.40e-06 5.88e-06 6.86e-06 1.10e-05 erg/cm2
Error 5.80e-08 6.64e-08 1.04e-07 1.49e-06 2.04e-07 1.24e-06 erg/cm2
Peak flux Cutoff-PL 7.60e-01 9.10e-01 6.74e-01 4.61e-01 2.59e+00 2.81e+00 ph/cm2/s
Error 1.11e-01 7.81e-02 6.51e-02 -------- 1.90e-01 3.23e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.564 0.061 - - 2.33e-03 7.28e-05 44.950 57
CPL 1.485 0.182 338.0 0.0 2.54e-03 5.25e-04 44.630 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.409 0.118 - - 2.16e-02 1.55e-03 57.680 57
CPL 0.954 0.487 111.6 1136.1 3.74e-02 2.32e-02 54.800 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: 112.384000 sec.
T50 in the 50-300 keV band: 36.736000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 316.048 -4.880 311.168
T90 203.888 -1.680 202.208
T50 55.424 5.952 61.376
Peak 1.000 1.492 2.492
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
147.4261 +70.5084 0.0031 1.6 118.8 4.6411 62.5 TRIG_00657750
------------------------------------------
Foreground time interval of the image:
-4.880 13.381 (delta_t = 18.261 [sec])
Background time interval of the image:
-239.120 -4.880 (delta_t = 234.240 [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 -4.880 sec. to 311.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56430 ( -0.0609053 0.06111 )
Norm@50keV : 2.32712E-03 ( -7.28256e-05 7.27134e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.95 using 59 PHA bins.
# Reduced chi-squared = 0.7886 for 57 degrees of freedom
# Null hypothesis probability = 8.761578e-01
Photon flux (15-150 keV) in 316 sec: 0.295834 ( -0.00984169 0.0098846 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.90906e-06 ( -2.32404e-07 2.3351e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.880 sec. to 311.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48467 ( -0.248391 0.116382 )
Epeak [keV] : 337.988 ( -337.993 -337.993 )
Norm@50keV : 2.54019E-03 ( -0.000275313 0.000774881 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.63 using 59 PHA bins.
# Reduced chi-squared = 0.7969 for 56 degrees of freedom
# Null hypothesis probability = 8.628326e-01
Photon flux (15-150 keV) in 316 sec: 0.293968 ( -0.01116 0.011022 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.86425e-06 ( -2.73087e-07 1.35438e-07 ) ergs/cm2
Band function
Time interval is from -4.880 sec. to 311.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41756 ( 1.30043 1.30043 )
beta : -1.63777 ( 1.63662 0.126517 )
Epeak [keV] : 192.012 ( -204.077 -204.077 )
Norm@50keV : 2.75592E-03 ( -0.000449101 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.39 using 59 PHA bins.
# Reduced chi-squared = 0.8070 for 55 degrees of freedom
# Null hypothesis probability = 8.463612e-01
Photon flux (15-150 keV) in 316 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] : 15.3747 ( )
R^2/D10^2 : 2.89220E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 258.77 using 59 PHA bins.
# Reduced chi-squared = 4.5398 for 57 degrees of freedom
# Null hypothesis probability = 1.697198e-27
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.504e-07 2.876e-08
25- 50 1.830e-06 6.968e-08
50-150 2.976e-06 1.932e-07
15-150 5.256e-06 1.959e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-26.0961 -200)
Norm : 1.19125 (-0.0367151 0.0367151)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.23 using 59 PHA bins.
# Reduced chi-squared = 0.8285 for 57 degrees of freedom
# Null hypothesis probability = 8.186523e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.377e-07 3.318e-08
25- 50 1.804e-06 5.641e-08
50-150 3.956e-06 1.296e-07
15-150 6.697e-06 2.338e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.62074 (-0.928414 1.09273)
R1^2/D10^2 : 0.363827 (-0.146196 0.275323)
kT2 [keV] : 25.0022 (-2.81189 4.23852)
R2^2/D10^2 : 4.28695E-03 (-0.0018467 0.00240204)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.42 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.863152e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.084e-07 1.141e-07
25- 50 1.768e-06 1.386e-07
50-150 3.995e-06 3.539e-07
15-150 6.671e-06 4.392e-07
Peak spectrum fit
Power-law model
Time interval is from 1.492 sec. to 2.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40945 ( -0.117903 0.1187 )
Norm@50keV : 2.16367E-02 ( -0.00155429 0.00154768 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.68 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.498050e-01
Photon flux (15-150 keV) in 1 sec: 2.64066 ( -0.183962 0.184014 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08668e-07 ( -1.68546e-08 1.70037e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.492 sec. to 2.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.953678 ( -0.51514 0.45842 )
Epeak [keV] : 111.561 ( -36.3383 2235.93 )
Norm@50keV : 3.73615E-02 ( -0.0153741 0.0309418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.80 using 59 PHA bins.
# Reduced chi-squared = 0.9786 for 56 degrees of freedom
# Null hypothesis probability = 5.202353e-01
Photon flux (15-150 keV) in 1 sec: 2.59449 ( -0.19 0.18976 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00562e-07 ( -1.8916e-08 1.894e-08 ) ergs/cm2
Band function
Time interval is from 1.492 sec. to 2.492 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.65864 ( -3.10591 -1.67692 )
beta : -1.55818 ( 1.55796 0.172169 )
Epeak [keV] : 33.7360 ( -8.80511 128.145 )
Norm@50keV : 2.99364 ( -3.38504 456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.70 using 59 PHA bins.
# Reduced chi-squared = 0.9581 for 55 degrees of freedom
# Null hypothesis probability = 5.630917e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03525e-07 ( -2.03518e-07 -1.7466e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.9008 (-1.29671 1.44721)
R^2/D10^2 : 0.313714 (-0.0858383 0.11603)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.91 using 59 PHA bins.
# Reduced chi-squared = 1.647 for 57 degrees of freedom
# Null hypothesis probability = 1.506801e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.460e-08 1.795e-09
25- 50 5.765e-08 5.175e-09
50-150 8.686e-08 1.273e-08
15-150 1.591e-07 1.485e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-31.4006 -200)
Norm : 10.7933 (-0.749864 0.749864)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.60 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.166053e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.697e-08 2.045e-09
25- 50 5.189e-08 4.855e-09
50-150 1.138e-07 3.333e-08
15-150 1.927e-07 3.320e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.30378 (-1.55288 1.90209)
R1^2/D10^2 : 2.19830 (-1.09228 2.5648)
kT2 [keV] : 26.3235 (-5.32083 10.9742)
R2^2/D10^2 : 3.44087E-02 (-0.0239578 0.0250665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.93 using 59 PHA bins.
# Reduced chi-squared = 0.9624 for 55 degrees of freedom
# Null hypothesis probability = 5.540890e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.367e-08 7.260e-09
25- 50 5.261e-08 1.152e-08
50-150 1.250e-07 5.180e-08
15-150 2.013e-07 6.023e-08
Plot creation:
Wed Oct 7 11:17:12 EDT 2015