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GCN Circular 339

X-ray/GRB 1SAX J0835.9+5118, Optical Observation
1999-05-21T15:55:42Z (25 years ago)
Arne A. Henden at USNO/USRA <>
A. Henden (USRA/USNO), F. Vrba, C. Luginbuhl, R. Stone,
B. Canzian, J. Munn, S. Levine, H. Guetter (USNO)

We monitored the field of the BeppoSAX fast X-ray transient 1SAX J0835.9+5118
(Piro GCN 333, Gandolfi et al., IAUC 7174) on the night of UT 990521
with the USNO 1.0-m telescope.  The night was photometric during the
observations, though cirrus arrived shortly thereafter.  Enough
standards were observed to calibrate the field in BVRI.  The calibration
file can be found on
where 19 Landolt standards were used for the photometric calibration, and
USNO-A2.0 was used for the astrometric calibration.  Stars brighter than
V=13.5 are saturated and are included only as field identifiers.

A report on our deeper imagery will be posted later.

[GCN EDITOR'S NOTE:  J.Greiner would like the GRB community to know
that due to a recent computer theft incident and subsequent computer
replacements operations, his GRB web site has moved to a new URL:]
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