Gamma-ray Burst 030416

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  
  TITLE:          GCN/HETE BURST POSITION NOTICE
  NOTICE_DATE:    Thu 17 Apr 03 02:47:53 UT
  NOTICE_TYPE:    HETE Ground Analysis
  TRIGGER_NUM:    10897,   Seq_Num: 1
  GRB_DATE:       12745 TJD;   106 DOY;   03/04/16
  GRB_TIME:       39839.00 SOD {11:03:59.00} UT
  TRIGGER_SOURCE: Trigger on the 6-120 keV band.
  SC_-Z_RA:       345 [deg]
  SC_-Z_DEC:       14 [deg]
  SC_LONG:        136 [deg East]
  WXM_CNTR_RA:    166.711d {+11h 06m 51s} (J2000),
                  166.753d {+11h 07m 01s} (current),
                  166.074d {+11h 04m 18s} (1950)
  WXM_CNTR_DEC:    -2.883d {-02d 52' 58"} (J2000),
                   -2.901d {-02d 54' 02"} (current),
                   -2.612d {-02d 36' 44"} (1950)
  WXM_MAX_SIZE:   14.00 [arcmin] diameter
  WXM_LOC_SN:     16 sig/noise (pt src in image)
  WXM_IMAGE_SN:   X= 7.5 Y= 8.0 [sig/noise]
  WXM_LC_SN:      X= 17.4 Y= 19.0 [sig/noise]
  SUN_POSTN:       24.16d {+01h 36m 39s}  +10.06d {+10d 03' 43"}
  SUN_DIST:       142.18 [deg]
  MOON_POSTN:     200.72d {+13h 22m 54s}   -5.25d {-05d 15' 02"}
  MOON_DIST:       33.96 [deg]
  MOON_ILLUM:     100 [%]
  GAL_COORDS:     258.79,50.80 [deg] galactic lon,lat of the burst
  ECL_COORDS:     168.90,-7.90 [deg] ecliptic lon,lat of the burst
  COMMENTS:       Definite GRB.
  COMMENTS:       WXM error box is circular; not rectangular.
  COMMENTS:       Burst_Validity flag is true.
  

• GCN notice #2154
  V. Lipunov, A. Krylov, V. Kornilov, A.M. Kuznetsov, V. Amirhanyan, G. Borisov, A. Belinski, D. Kuvshinov, S. Potanin, V. Vitrischak
  Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow report:
  The error box of GRB030416 (HETE Ground Analysis, TRIGGER_NUM:10897) was observed with MASTER system (280mm, http://observ.pereplet.ru). We obtained 25 measurements in R filter. Our observations started at Apr 17, 17h56m37s UT (33 hours after the GRB) and had been lasting for 4.0 hours up to Apr 17, 21h57m17s UT (37 hours after the GRB).
  We had very poor transparancy and full Moon at all time, so flux measurements uncertanities were quite big.
  There is no OT brighter that 15.0 (R-band) in error box.
  Our fts available at: http://observ.pereplet.ru/images/GRB030416/
  This message may be cited.
• GCN notice #2209
  J.G. Jernigan, N. Butler, R. Vanderspek, G. Crew, J. Doty, J. Villasenor, G. Monnelly, T. Cline, A. Levine, F. Martel, E. Morgan, G. Prigozhin, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams;
  G. Ricker, J-L Atteia, N. Kawai, D. Lamb, and S. Woosley on behalf of the HETE Science Team;
  Y. Shirasaki, C. Graziani, T. Donaghy, M. Matsuoka, M. Suzuki, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, Y. Nakagawa, D. Takahashi, R. Satoh, and Y. Urata, on behalf of the HETE WXM Team;
  M. Boer, J-F Olive, J-P Dezalay, C. Barraud and K. Hurley on behalf of the HETE FREGATE Team;
  write:
  At 11:03:59.00 UTC (39839.00 s UT) on 16 Apr 2003, the HETE FREGATE and WXM instruments detected event U10897, an X-ray flash.
  The burst had essentially no flux in the FREGATE 30-400 keV trigger band. The FREGATE 6-80 keV trigger and the WXM trigger were not active at the time, to avoid triggers due to flaring activity from Sco X-1. Consequently, the burst did not produce an on-board trigger. The SXC was off because of illumination by the full moon.
  The event was noticed by operators on the ground. Ground analysis of the WXM data for the burst produced a location which was reported in a GCN Notice at 02:47:53 UTC on 17 April 2003, about 16 hours after the burst. The WXM ground localization SNR was 16. The WXM localization can be expressed as a 90% confidence circle that is 7 arcminutes in radius and is centered at:
  R.A. = 11h 06m 51s, Dec. = -02d 52' 58" (J2000).
  The T_90 duration of the burst in the 2-25 keV WXM energy band was ~ 50 s. The fluence of the burst was ~ 5 x 10^-7 erg cm^-2 in the 2-25 keV energy band and ~ 1 x10^-7 erg cm^-2 in the 30-400 keV energy band; thus S(2-25)/S(30-400 keV) ~ 5. Therefore this burst is an XRF.
  A light curve and skymap for GRB030416 is provided at the following URL:
  http://space.mit.edu/HETE/Bursts/GRB030416
• GCN notice #2250
  A. Henden, J. Silvay, J. Moran, R. Soule, D. Reichart, J. Schaefer, R. Canterna, and B. Scoggins report on behalf of the USNO, UWYO, and UNC GRB teams of the FUN GRB collaboration:
  We observed the entire 14 arcminute diameter error circle of XRF 030416 (Jernigan et al., GCN 2209) in BVRcIc beginning 15.4 hours after the burst, despite a bright moon. We report the following limiting magnitudes:

  Start      Start Time Filter Integration Limiting  Telescope  Calibration
  Date       Since GRB         Time (sec)  Magnitude            Catalog
             (hours)           x Pointings (3 sigma)
  Apr 17.103 15.391     Rc     6000 x 1    19.8      0.6-m RBO* USNO A2.0
  Apr 17.143 16.361     B      300 x 1     20.1      1.3-m USNO USNO A2.0
  Apr 17.149 16.502     V      300 x 1     20.9      1.3-m USNO ACT
  Apr 17.155 16.643     Rc     300 x 1     20.4      1.3-m USNO USNO A2.0
  Apr 17.160 16.784     Ic     300 x 1     19.9      1.3-m USNO USNO B1.0
  Apr 20.143 88.454     Rc     2160 x 1    22.3      1.3-m USNO USNO A2.0
  

  * RBO = Red Buttes Observatory
  Using the image subtraction routine ISIS2 (Alard 2000, A&AS, 114, 363), we find no transient sources in either of our Rc images of April 17th when compared to our Rc image of April 20th.