Gamma-ray Burst 000301A
On March 1, 2000, 02:33:55 UT Earth-crossing time, a GRB was detected
by Ulysses, BATSE (#8005), NEAR, Konus, and the BeppoSAX GRBM.
(All information courtesy of the instrument teams.)
Previous IAU Circulars
Results of Observations
- GCN notice #567
K. Hurley, S. Barthelmy, T. Cline, E. Mazets, and M. Feroci, report:
Ulysses, BATSE, NEAR, Konus, and the BeppoSAX GRBM observed this burst
(BATSE #8005). Its Earth-crossing time was 02:33:55 UT. Its duration
was ~6 s, and its 25-100 keV fluence was ~2 x 10^-6 erg/cm2.
Preliminary triangulation gives an ~35 sq. arcmin. error box whose
center and corners (3 sigma) are at:
RA(2000) DEC(2000)
23 h 39 m 27.12 s 75 o 47 ' 12.86 " (CENTER)
23 h 38 m 13.41 s 75 o 53 ' 21.64 " (CORNER)
23 h 39 m 55.29 s 75 o 48 ' 43.78 " (CORNER)
23 h 38 m 59.05 s 75 o 45 ' 41.71 " (CORNER)
23 h 40 m 40.21 s 75 o 40 ' 59.86 " (CORNER)
This error box can be refined considerably.
- GCN notice #569
E. Rol (Univ. of Amsterdam), R. Strom (NFRA, UoA), P. Vreeswijk (UoA),
C. Kouveliotou (USRA, NASA/MSFC), L. Kaper (UoA) report, on behalf of
a larger collaboration:
We have observed the IPN error box of the GRB000301A (GCN #567) at
4.9 GHz with the Westerbork Synthesis Radio Telescope. We obtained a 6
hour observation, centered at March 2.64 UT. Within the error box, we
detect only one source, at a flux level of 0.37 +- 0.055 mJy. The
position of the source is (J2000):
RA 23:39:47
Decl 75:46:15
with a conservative error of 2 arcseconds.
At this point, we do not claim that this is the radio counterpart to
GRB000301A. We are currently trying to find a catalogue for this
wavelength to compare with. Observations of the error box will
continue with the WSRT.
- GCN notice #574
D. A. Frail and G. B. Taylor (NRAO) report:
We imaged the IPN error box of GRB000301A (GCN #567) with the VLA at
frequencies of 4.86 GHz and 8.46 GHz, starting on March 3.86 UT. The
radio source reported by Rol et al. (GCN #569) is visible. We obtain
an improved position of (J2000) r.a.= 23 39 47.51 (+/-0.05), dec. =
+75 46 14.5 (+/-0.2). The VLA flux density at 4.86 GHz is 408+/-61
microJy, consistent with that measured at WSRT 30 hrs earlier. The
8.46 GHz flux density is 432+/-68 microJy, and indicates a flat
spectrum. A search of the NRAO All Sky Survey (NVSS; Condon et
al. 1998, AJ, 115, 1693) shows that the VLA observed in this direction
at a frequency of 1.4 GHz on 1993 October 20. At the position of the
radio source there is a weak (2.5-sigma) NVSS source with a flux
density of 1.1+/-0.45 milliJy.
The absence of significant variability, the flat spectrum and the
possible identification of a NVSS source at this position, makes it
unlikely that the radio source is related to GRB 000301A.
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Jochen Greiner, last update: 7-Mar-2000
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