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GCN Circular 341

Subject
X-ray/GRB 1SAX J0835.9+5118, Optical Observation
Date
1999-05-22T08:23:45Z (25 years ago)
From
Christian B. Luginbuhl at USNO/Flagstaff <cluginbuhl@nofs.navy.mil>
C. Luginbuhl (USNO), A. Castro-Tirado (LAEFF-INTA Madrid and IAA-CSIC
Granada), B. Canzian (USNO), E. Costa (IAS Frascati), J. Greiner (AIP
Potsdam), H. Guetter (USNO), A. Henden (USRA/USNO), M. Kuemmel (MPIA,
Heidelberg), S. Levine (USNO), J. Munn (USNO), S. Phleps (MPIA
Heidelberg), E. Pian (ITESRE Bologna), T. Rauch (Univ. of Tuebingen),
and F. Vrba (USNO)

report that a detailed comparison of R-band imaging described in GCN
336 (May 20.82 UT, limiting magnitude R=22.5) and GCN 339 (May 21.18
UT, limiting magnitude R=20.2), as well as additional imaging at the
Calar-Alto 2.2m telescope (May 21.82 UT, limiting magnitude R=21.5)
shows no variable objects at the three sigma level to approximately
R=21.5 within or near the 3-arcmin radius error circle of 1SAX
J0835.9+5118 (GCN 333).  Areas within about 2 arcmin of the error
circle are included in these images.  There is some further processing
that can be done that may improve the detection limits on the May 21.82
Calar-Alto image.

The object noted by Bloom et al. (GCN 335) continues to appear stellar,
with R=21.21 +/- 0.06.  The galaxy noted by Pedersen et al (GCN 340) is
clearly extended in these data, but shows no detail indicative of a
superposed star or SN, though our seeing was at best just 1.3 arcsec.

All photometric measures reported here are calibrated with the sequence
by Henden et al. (GCN 339).

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