GRB 000301A
GCN Circular 567
Subject
GRB000301A [IPN Position]
Date
2000-03-02T01:29:50Z (25 years ago)
From
Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu>
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 Circular 569
Subject
Radio observations of the error box of GRB000301A
Date
2000-03-03T00:08:23Z (25 years ago)
From
Evert Rol at U.Amsterdam <evert@astro.uva.nl>
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."
This message may be cited
GCN Circular 574
Subject
GRB 000301A, Radio Observations
Date
2000-03-03T22:59:39Z (25 years ago)
From
Dale A. Frail at NRAO <dfrail@nrao.edu>
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."