Gamma-ray Burst 120403A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 03 Apr 12 01:17:01 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     519211,   Seg_Num: 0
  GRB_RA:           42.459d {+02h 49m 50s} (J2000),
                    42.655d {+02h 50m 37s} (current),
                    41.660d {+02h 46m 38s} (1950)
  GRB_DEC:         +40.466d {+40d 27' 57"} (J2000),
                   +40.516d {+40d 30' 58"} (current),
                   +40.259d {+40d 15' 33"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       4641 [cnts]    Image_Peak=175 [image_cnts]
  TRIGGER_DUR:     1.024 [sec] 
  TRIGGER_INDEX:   146     E_range: 25-100 keV
  BKG_INTEN:       31333 [cnts]
  BKG_TIME:        3911.93 SOD {01:05:11.93} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        16020 TJD;    94 DOY;   12/04/03
  GRB_TIME:        3923.58 SOD {01:05:23.58} UT
  GRB_PHI:         -48.72 [deg]
  GRB_THETA:        33.29 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     9.38 [sigma]
  IMAGE_SIGNIF:    7.42 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +0  +2  -2 -100  +0 -71  +0 
  SUN_POSTN:        12.60d {+00h 50m 25s}   +5.40d {+05d 24' 09"}
  SUN_DIST:         44.25 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
  MOON_POSTN:      143.46d {+09h 33m 50s}   +9.24d {+09d 14' 13"}
  MOON_DIST:        92.08 [deg]
  MOON_ILLUM:      82 [%]
  GAL_COORDS:      146.07,-17.03 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       52.42, 23.03 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
  COMMENTS:        probably due to it occurring during a Malindi downlink session.  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 258.44,20.49 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 03 Apr 12 01:17:25 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     519211,   Seg_Num: 0
  GRB_RA:           42.459d {+02h 49m 50s} (J2000),
                    42.655d {+02h 50m 37s} (current),
                    41.660d {+02h 46m 38s} (1950)
  GRB_DEC:         +40.466d {+40d 27' 57"} (J2000),
                   +40.516d {+40d 30' 58"} (current),
                   +40.259d {+40d 15' 33"} (1950)
  GRB_DATE:        16020 TJD;    94 DOY;   12/04/03
  GRB_TIME:        3923.58 SOD {01:05:23.58} UT
  TRIGGER_INDEX:   146
  GRB_PHI:         -48.72 [deg]
  GRB_THETA:        33.29 [deg]
  DELTA_TIME:      -43.00 [sec]
  TRIGGER_DUR:     1.024 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     9.38 [sigma]
  IMAGE_SIGNIF:    7.42 [sigma]
  LC_URL:          sw00519211000msb.lc
  SUN_POSTN:        12.60d {+00h 50m 25s}   +5.40d {+05d 24' 10"}
  SUN_DIST:         44.25 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
  MOON_POSTN:      143.46d {+09h 33m 51s}   +9.24d {+09d 14' 09"}
  MOON_DIST:        92.09 [deg]
  MOON_ILLUM:      82 [%]
  GAL_COORDS:      146.07,-17.03 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       52.42, 23.03 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Lightcurve.  
  COMMENTS:           
  COMMENTS:        The next comments were copied from the BAT_POS Notice:  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 258.44,20.49 [deg].  
  

  
• GCN Circular #13191
  A. P. Beardmore (U Leicester), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), V. D'Elia (ASDC), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-OAB/PSU) and C. A. Swenson (PSU) report on behalf of the Swift Team:
  At 01:05:23 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120403A (trigger=519211). Swift did not slew because of the Sun observering constraint. The BAT on-board calculated location is RA, Dec 42.459, +40.466 which is

     RA(J2000)  =  02h 49m 50s
     Dec(J2000) = +40d 27' 57"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike with a duration of about 2 sec. The peak count rate was ~2200 counts/sec (15-350 keV), at ~0 sec after the trigger.
  Due to a Sun observing constraint, Swift cannot slew to the BAT position until 18:44 UT on 2012 June 25. There will thus be no XRT or UVOT data for this trigger before this time.
  Burst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
• GCN Circular #13195
  T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
  Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 120403A (trigger #519211) (Beardmore, et al., GCN Circ. 13191). The BAT ground-calculated position is RA, Dec = 42.458, 40.489 deg which is

     RA(J2000)  =  02h 49m 49.8s 
     Dec(J2000) = +40d 29' 21.8" 
  

  with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%.
  The mask-weighted light curve shows a single peak, starting at T+0 s, peaking at T+0.1 s and ending at T+1.8 s. T90 (15-350 keV) is 1.25 +- 0.19 sec (estimated error including systematics).
  The time-averaged spectrum from T+0.0 to T+1.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.64 +- 0.30. The fluence in the 15-150 keV band is 1.0 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band is 1.1 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
  The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/519211/BA/
• GCN Circular #13197
  V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
  E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, A.Kuznetsov, A.Sankovich Moscow Lomonosov State University, Sternberg Astronomical Institute,
  K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
  A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
  V.Krushinski, I.Zalozhnich, A. Popov, A. Bourdanov, A. Punanova Ural Federal University
  Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
  Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
  MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB120403A 35321 sec s after notice time and 36026 sec after GRB time at 2012-04-03 11:05:49.415 UT. On our first (180s exposure) set we haven`t found optical transient within SWIFT error-box (Beardmore et al., GCN Circ 13191). The 5-sigma upper limit has been about 16.0 mag The message may be cited.
  The long delay was due to the Eath rotation.
  The message may be cited.
• GCN Circular #13204
  J. Norris (BSU), T. Sakamoto (GSFC/UMBC), S.D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC) for the BAT Team:
  We report the spectral lag analysis for GRB 120403A (Beardmore, et al., GCN Circ. 13191) based on the BAT data. Using 64-ms binned light curves, the spectral lag for the 15-25 keV to 50-100 keV bands is 63 +380/-180 msec. Because of a relatively large error in the lag measurement due to a weak nature of the burst, we can not conclusively say that this burst is in the short burst category.