GRB030131 observations from Nyrölä Observatory

The revised INTEGRAL error circle of GRB030131 imaged February 1, 2003 03:49-04:52 UT through Rc filter.

Copyright: Nyrölä Observatory, 2003

The optical afterglow suspect reported in the following GCN was not real. The followup circulars (GCN 1950, 1951 and 1952) confirmed that there was no optical transient at the position shown in our images. The faint star-like object is most probably a processing artifact.


 
TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1849
SUBJECT: GRB 030131: afterglow candidate 
DATE:    03/02/03 19:41:56 GMT
FROM:    Arto Oksanen at Nyrola Obs., Finland  

A. Oksanen (Jyvaskylan Sirius ry) reports on behalf of Nyrola Observatory GRB-team 
and AAVSO International GRB Network:

A 24 x 16 arcmin field covering the corrected INTEGRAL error circle of GRB 030131 
(GCN 1848) was imaged with the 0.4m SCT at the Nyrola Observatory starting at 
February 1, 2003 03:49 UT, 20 hours after the burst. The 19 x 180s Rc-exposures 
were sigma reject combined and compared to the Digitized Sky Survey (DSS2R) and 
one faint (R=20.5) new object was found near the image limit. 
 
The position of the suspect is:

   13:28:28.46   +30:42:05.4     J2000

using the USNO-A2.0 reference catalog. 

The combined image may contain some processing artifacts so the confidence that 
the suspect is a GRB OT is not very high. The FITS frame and a JPEG picture 
showing the corrected error circle plus the suspect OT are available on: 
http://nyrola.jklsirius.fi/grb/grb030131/

This message may be cited.

Fit-files

The combined fit frame is also available: GRB030131_20030201.fit (786 KB)

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