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GCN Circular 17

Subject
Untitled
Date
1970-01-01T00:00:00Z (55 years ago)
From
circulars@gcn.nasa.gov
GRB 971227 optical observations:                                    #017

Paul Groot, Titus Galama (Univeristy of Amsterdam), Jan van Paradijs 
(UoA and University of Alabama in Hunstville), Chryssa Kouveliotou 
(USRA at NASA/MSFC), Nic Walton, (ING La Palma), Penny Sackett 
(Groningen), Arlin Crotts (Columbia University, NY), Simone Bianchi 
and Jonathan Davies (Cardiff, UK) report:
"Visual comparison of optical R-band observations made on December 
28.237 UT (1800s) and December 29.108 UT (900s) with the 2.5m Isaac 
Newton Telescope at La Palma of the inner 12'x12' region of the 
SAX WFC errorbox of GRB971227 shows no obvious varying object. 
Preliminary photometry shows that this corresponds to an upper limit 
on variability of 0.3 mags down to a limiting magnitude of R=22.8"

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