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GCN Circular 1439

GRB/XRF 020427, detection of an underlying system with the VLT
2002-06-25T05:45:40Z (22 years ago)
Alberto Castro-Tirado at Astro. de Andalucia <>
GRB/XRF 020427, detection of an underlying system with the VLT

A. J. Castro-Tirado and J. Gorosabel (Instituto de Astrof�sica
de Andaluc�a, IAA-CSIC, Granada)
C. S�nchez-Fern�ndez (ESA-VILSPA, Madrid)
N. Lund and S. Brandt (DSRI, Copenhagen)
J. M. Castro Cer�n (ROA, San Fernando)


"We have observed the field of the GRB/XRF 020427 (GCN Circulars 1383, 1384,
1386, 1390, 1394) on 11.388-11.397 June 2002 with the 8.2-m VLT telescope
at Paranal ESO's observatory (equipped with FORS2). Imagery was obtained
in the B- and R-bands (300-s exposure time each) under rather poor seeing
conditions (1".2). The position of the likely X-ray afterglow detected by
BSAX and followed-up by Chandra (GCN Circulars 1387, 1392) is coincident
with the north part of a extended (about 4" x 2"), blue object with R =
23.3 +/- 0.2 and B = 23.8 +/- 0.4 which is consistent with the galaxy system
reported independently by Fruchter et al. (GCN Circ. 1440). An identification
chart is posted at
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