At :: UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB  ***A*** (trigger=1327910).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec ,  which is 
   RA(J2000) = h m s
   Dec(J2000) = d ' "
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a [**double-peaked**]
structure with a duration of about TTT sec.  The peak count rate
was ~2625 counts/sec (15-350 keV), at ~1 sec after the trigger.

Initial TDRSS lightcurve and spacecraft attitude plot

TDRSS lightcurve from T0-30 to T0+50 (zoom in)

TDRSS light curve from T0-1 to T0+2 (More zoom in)

1.6s binned TDRSS light curve

Tilan's background subtracted TDRSS light curves

Extended TDRSS light curve and spacecraft attitude plot(s)

Extended TDRSS lc No.1

TDRSS extended lightcurve from T0-1 to T0+2

T50 and T90 calculation

******************************************
         battblocks v1.18
------------------------------------------
     Input Data: bat_raw_lc.fits
     Output GTI: bb.gti
 Events to Skip: 128     Changepoint log(prob) Prior: 6.000000
  Internal Tick: 1.000000e-04 s
  Lookback time: 0 s
 Bkg. Subtract?: yes (for fluence/T50/T90 calculations)
------------------------------------------
  Estimated T90 duration: 87.936 s +/- 58.5877 s
  Estimated T50 duration: 87.936 s +/- 64.0553 s
  Estimated Peak Interval: MET   772560333.31200004 +/- 0.500000 s
  Estimated background rate 1:     4035.135 near MET 772560320.640000 s
  Estimated background rate 2:     4376.465 near MET 772560469.568000 s
  Estimated total duration: 87.936 s (for data selection)
       (from MET 772560332.480000 to MET 772560420.416000)
  Estimated total fluence: -1975.072897 count
  Created GTI with 10 entries
------------------------------------------
 

Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)

bat_grb_pos_cat.sh   0.083

Usage: bat_grb_pos_cat.sh   []

   Searches through the BAT GRB position (all numbers in degrees)

Search for this GRB position to the source locations in BAT transient monitor (search radius within 12 arcmin)

python compare_catalog.py  
No match

Link to SIMBAD

Frank's UVOT result

Frank's UVOT Blinking images

Elevation angle of GRB/Sun at the ground telescope locations

Usage elevation_grd_obs.sh (ra) (dec) (UT year) (UT month) (UT day) (UT hour)
 
 
The data/results are in /local/data/bat1/prebascript/trigger1327910/tdrss_ql/
 
bat_raw_lc.fits  : TDRSS FITS light curve from GCN
gcn_position.txt : GCN BAT position notice
ratelc_tdrss.qdp : QDP file of the TDRSS light curve
tdrss_lc.gif     : GIF TDRSS light curve
sc_att.qdp       : QDP file of the spacecraft attitude
sc_att.gif       : GIF spacecraft attitude
bb.gti           : Bayesian block GTI file (battblocks)
dur.gti          : Duration GTI file (battblocks)
battblocks.log   : Output log of battblocks
 

Plot creation:
Thu Jun 26 15:37:42 EDT 2025