* Czech 15-yr auction demand strong, yields up
* Polish yield rises at 2-yr, 5-yr auctions
* Markets brace for new supply as auctions pick up
By Jason Hovet
PRAGUE, April 1 (Reuters) - Central Europe's fiscally-stronger countries Poland and the Czech Republic stepped up borrowing at auctions on Wednesday, scooping up funds despite a jump in yields.
A slight pickup in global sentiment has raised investors' appetite for emerging assets over the past month and auctions have been well-bid although debt has become costlier.
The Czech Finance Ministry sold a quarter more than offered of its 4.7 percent coupon bonds due 2022 at a Wednesday auction, with the average yield rising about 80 basis points from a June 2008 auction, when interest rates were 200 basis points higher.
In Poland demand outweighed supply at auctions of 2-year and 5-year bonds, with yields rising around 50-70 basis points over previous auctions. [
]"As we expected, demand for the short end of the curve was bigger than for the long end," said Pawel Golebiewski, a fixed income dealer at BPH bank in Warsaw.
Analysts warned that, while Poland and Czech Republic are better off than their neighbours, keeping up the pace of borrowing could be tougher later this year due to economic uncertainties and a spate of competing issuance from western European countries selling record debt to combat recession.
"The overall supply of government debt is exploding now, and within that it will be harder for the Czech Republic or Poland to attract buyers," said Lars Christensen, senior economist at Danske Bank.
Central Europe's bond markets are slowly recovering after the widening global financial crisis hit the region hard last autumn, and the region's currencies have taken a beating from growing concerns over growth, financing and banks.
The Czech Republic issued a third more in bonds than planned in March after going slow to start the year, and on Wednesday announced plans to offer 21 billion crowns of bonds at three auctions in May, similar to plans this month. [
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LONGER-DATED DOUBTS
Analyst and rating agencies generally view Poland and the Czech Republic as being better off than neighbours such as Hungary or Romania, which have both sought aid packages from the International Monetary Fund and European Union.
Hungary's bond market has stayed under pressure with rising yields on secondary markets -- accelerated by downgrades from ratings agencies this week -- and the state has virtually halted bond issues since October.
The Poles and Czechs have had little trouble in raising short-term debt, but concerns have started over the willingness of funds and bank books to buy longer-dated maturities.
"I'm afraid on the long end there will not be such demand," said a Czech fund manager. "The new (Czech) calendar (includes) quite a lot, so I would expect spreads to widen."
The Czech 15-year bond <CZ15YT=RR> on auction on Wednesday traded with an asset swap spread of 202.7 basis points, down from 205.4 before the auction but compared with 107 in January.
In the Czechs' case, after an opposition-led no-confidence vote toppled Prime Minister Mirek Topolanek's government last week, there could be growing risks to financing costs, said Finance Minister Miroslav Kalousek.
"When an economic crisis is compounded by the opposition to include a political crisis, the opposition must realise that that it complicates problems with financing debt, as well as maintenance costs," he told Reuters.
(Additonal reporting by Jana Mlcochova and Dagmara Leszkowicz in Warsaw; Editing by Ruth Pitchford)