batgrbproduct analysis for trigger=1330958
batgrbproduct Analysis for Trigger=1330958
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Mon Jul 7 11:05:26 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1330958/GCN5_download_cron
======================================================================
Trigger: 01330958 Segment: 000
BAT Trigger Time: 773509746.88 [s; MET]
Trigger Stop: 773509755.072 [s; MET]
UTC: 2025-07-06T15:48:30.964200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 284.007496618123 Dec: 32.2870690698247 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 11.4891252930761 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 284.007496618123 Dec: 32.2870690698247 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 284.011433725708 Dec: 32.3268946184961 [deg; J2000]
{ 18h 56m 02.7s , +32d 19' 36.8" }
+/- 1.66662737108326 [arcmin] (estimated 90% radius based on SNR)
+/- 0.6990879190588 [arcmin] (formal 1-sigma fit error)
SNR: 14.662439153018
Angular difference between Flight and Ground position is 2.397860 arcmin
Partial Coding Fraction: 0.265625 [ including projection effects ]
Duration
T90: 31.8919999599457 +/- 7.22764152062382
Measured from: 1.07200014591217
to: 32.9640001058578 [s; relative to TRIGTIME]
T50: 16.1479998826981 +/- 4.35373870554184
Measured from: 6.41200017929077
to: 22.5600000619888 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.932000041008
to: 2.932000041008 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0959999561309814
to: 40.0880000591278 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.495102 0.800195 0.815323 0.224324
0.081188 0.084906 0.072852 0.057698 [error]
Peak 0.011010 0.047896 0.075631 0.025137
0.012667 0.013989 0.012859 0.009686 [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 1.81e-07 3.66e-07 5.76e-07 2.01e-06 1.60e-06 3.13e-06 erg/cm2
Error 3.41e-08 4.28e-08 6.91e-08 5.16e-07 1.76e-07 5.62e-07 erg/cm2
Peak flux Power-law 2.46e-01 3.63e-01 4.00e-01 8.30e-01 1.26e+00 1.84e+00 ph/cm2/s
Error 1.30e-01 1.23e-01 9.49e-02 3.95e-01 3.28e-01 4.56e-01 ph/cm2/s
Fluence Cutoff-PL 1.47e-07 3.98e-07 6.29e-07 6.57e-07 1.53e-06 1.83e-06 erg/cm2
Error 4.14e-08 5.21e-08 8.35e-08 5.66e-07 1.88e-07 5.81e-07 erg/cm2
Peak flux Cutoff-PL 1.48e-01 3.76e-01 4.86e-01 2.89e-01 1.20e+00 1.30e+00 ph/cm2/s
Error 1.63e-01 1.50e-01 1.40e-01 5.14e-01 3.37e-01 5.87e-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 1.344 0.169 - - 4.15e-03 4.29e-04 59.120 57
CPL 0.346 0.829 88.6 59.9 1.24e-02 1.32e-02 53.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.860 0.397 - - 1.10e-02 2.89e-03 51.320 57
CPL -0.791 2.855 103.4 -34.1 5.28e-02 7.78e-01 49.240 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: 24.960000 sec.
T50 in the 50-300 keV band: 9.600000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 40.184 -0.096 40.088
T90 31.892 1.072 32.964
T50 16.148 6.412 22.560
Peak 1.000 1.932 2.932
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
284.0114 +32.3269 0.0131 39.2 138.8 2.5386 14.7 TRIG_01330958
------------------------------------------
Foreground time interval of the image:
-0.096 27.400 (delta_t = 27.496 [sec])
28.120 40.088 (delta_t = 11.968 [sec])
Background time interval of the image:
-239.880 -0.096 (delta_t = 239.784 [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
Multiple GTIs in the spectrum
tstart tstop
-0.096000 27.400000
28.120000 40.088000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34438 ( -0.169755 0.167442 )
Norm@50keV : 4.15214E-03 ( -0.000428818 0.000428811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.12 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.978653e-01
Photon flux (15-150 keV) in 39.46 sec: 0.499641 ( -0.0544128 0.0546141 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60225e-06 ( -1.75256e-07 1.75978e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-0.096000 27.400000
28.120000 40.088000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.345899 ( -0.908775 0.75015 )
Epeak [keV] : 88.6200 ( -20.1431 99.6311 )
Norm@50keV : 1.23976E-02 ( -0.0068358 0.0195706 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.71 using 59 PHA bins.
# Reduced chi-squared = 0.9591 for 56 degrees of freedom
# Null hypothesis probability = 5.620006e-01
Photon flux (15-150 keV) in 39.46 sec: 0.480514 ( -0.056594 0.056626 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52523e-06 ( -1.87344e-07 1.8779e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-0.096000 27.400000
28.120000 40.088000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.84571 ( -13.5884 -4.84571 )
beta : -1.54826 ( -0.231441 0.21713 )
Epeak [keV] : 32.0389 ( -8.10456 5.90322 )
Norm@50keV : 71.1775 ( -7.27757 440.493 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9822 for 55 degrees of freedom
# Null hypothesis probability = 5.121075e-01
Photon flux (15-150 keV) in 39.46 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] : 17.4702 (-1.92335 2.23748)
R^2/D10^2 : 3.59824E-02 (-0.0124272 0.0181817)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.35 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.917466e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.757e-08 1.805e-08
25- 50 3.959e-07 6.442e-08
50-150 8.699e-07 1.687e-07
15-150 1.353e-06 1.784e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-37.88 -200)
Norm : 2.11009 (-0.218706 0.218706)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.074e-07 3.113e-08
25- 50 3.989e-07 1.254e-07
50-150 8.750e-07 4.258e-07
15-150 1.481e-06 6.950e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.63009 (-2.38846 5.08033)
R1^2/D10^2 : 0.403157 (-0.318754 1.59558)
kT2 [keV] : 22.1220 (-3.91676 12.8018)
R2^2/D10^2 : 1.37081E-02 (-0.011617 0.0153364)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.547e-07 8.446e-08
25- 50 3.894e-07 1.902e-07
50-150 9.656e-07 5.028e-07
15-150 1.510e-06 6.461e-07
Peak spectrum fit
Power-law model
Time interval is from 1.932 sec. to 2.932 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.859894 ( -0.419824 0.374506 )
Norm@50keV : 1.09999E-02 ( -0.00293989 0.00284905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.32 using 59 PHA bins.
# Reduced chi-squared = 0.9003 for 57 degrees of freedom
# Null hypothesis probability = 6.872776e-01
Photon flux (15-150 keV) in 1 sec: 1.26247 ( -0.325229 0.331591 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25419e-07 ( -3.00077e-08 3.00704e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.932 sec. to 2.932 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.791245 ( -3.92414 1.78684 )
Epeak [keV] : 103.359 ( -35.1728 -103.36 )
Norm@50keV : 5.27797E-02 ( -0.0527771 1.50389 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.24 using 59 PHA bins.
# Reduced chi-squared = 0.8794 for 56 degrees of freedom
# Null hypothesis probability = 7.264971e-01
Photon flux (15-150 keV) in 1 sec: 1.20323 ( -0.336308 0.33866 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20506e-07 ( -3.46803e-08 3.2332e-08 ) ergs/cm2
Band function
Time interval is from 1.932 sec. to 2.932 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.65492 ( -3.25888 -1.37336 )
beta : -1.82063 ( 1.76968 1.04712 )
Epeak [keV] : 83.1689 ( -57.0995 82.992 )
Norm@50keV : 0.130716 ( -0.133657 11.4759 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.40 using 59 PHA bins.
# Reduced chi-squared = 0.8800 for 55 degrees of freedom
# Null hypothesis probability = 7.230540e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19643e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.5994 (-5.62735 9.0652)
R^2/D10^2 : 3.98432E-02 (-0.0254967 0.0562008)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.971e-09 2.059e-09
25- 50 2.185e-08 9.191e-09
50-150 9.079e-08 4.027e-08
15-150 1.166e-07 5.808e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-59.2395 -200)
Norm : 5.35234 (-1.39454 1.39454)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.334e-08 8.125e-09
25- 50 2.566e-08 1.518e-08
50-150 5.629e-08 3.456e-08
15-150 9.529e-08 5.710e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 18.4911 (-18.4915 10.9258)
R1^2/D10^2 : 6.99408E-02 (-0.0700005 -0.0700005)
kT2 [keV] : 195.452 (-196.126 -196.126)
R2^2/D10^2 : 1.37631E-04 (-0.000135515 0.0752406)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Mon Jul 7 11:10:01 EDT 2025