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XRF 011030

GCN Circular 1145

Subject
XRF011030: J and K band observations
Date
2001-11-21T14:25:54Z (24 years ago)
Edited On
2025-09-09T19:07:32Z (a month ago)
From
Elena Pian at ITESRE-CNR,Bologna <pian@tesre.bo.cnr.it>
Edited By
courey.elliott@gmail.com
F. Mannucci (CAISMI, CNR, Firenze), V. Calamai (INAF, Oss. Astrofisico di
Arcetri), E. Palazzi, N.  Masetti (ITeSRE, CNR, Bologna), E. Pian (INAF,
Astr. Obs. Trieste), P. Saracco (INAF, Astr. Obs.  Brera), A. Antonelli
(INAF, Astr. Obs. Rome), on behalf of a larger collaboration,

report:

We imaged the field of XRF011030 (GCN 1118) with TIRGO equipped with the
near-IR camera ARNICA and the J and K filters on Oct 30, 18:15 - 21:22 UT.
The PSF FWHM was about 2.0".  A standard star for flux calibration is
available in the K band only; the J band image was calibrated instead by
using an average zero point. No source is detected at the position of the
radio transient reported by Taylor et al. (GCN 1136), nor in the Chandra
error box of the X-ray source detected by Harrison et al. (GCN 1143) to
5-sigma limiting magnitudes of J=19.8 and K=18.0.

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GCN Circular 1143

Subject
XRF011030: Chandra Observations
Date
2001-11-18T02:59:44Z (24 years ago)
Edited On
2025-09-09T19:07:30Z (a month ago)
From
Derek Fox at CIT <derekfox@astro.caltech.edu>
Edited By
courey.elliott@gmail.com
F. A. Harrison, S. Yost, D. Fox, J. Heise, S. R. Kulkarni,
P. A. Price, and E. Berger report on behalf of the Caltech-NROA-CARA
GRB collaboration:  

"We obtained a 47 ksec Chandra observation of the field containing the
BeppoSAX X-ray transient XRF 011030 (GCN 1118), centered on the radio
transient reported by Taylor et al. (GCN 1136).  We detect an X-ray
source within 1.2'' of the radio transient, at RA 20:43:32.5, DEC
+77:17:17.4.  The X-ray spectrum over 0.2-5 keV is consistent with a
power law of photon index ~1.45, with interstellar absorption levels
of N_H ~ 2e21 cm^-2, consistent with the Galactic value along the line
of sight.  Extrapolating this spectrum to the 2-10 keV band, we derive
an unabsorbed flux of 2.4e-13 erg cm^-2 s^-1.  This source is not
detected in the ROSAT All-Sky Survey and its position is consistent,
within the uncertainties, with the VLA position of the radio
transient.  We therefore associate the X-ray source with the variable
radio object.  Further monitoring is planned in order to determine its
long-term X-ray variability."

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