iraf.net

NUMBER:	331
MODULE:	daophot.allstar
SYSTEM:	V2.10
DATE:	Thu Mar  7 13:27:11 MST 1996
FROM:	davis

BUG:	Allstar may crash with a floating point exception error if the
	input readout noise value is exactly zero. The cause of the crash
	is uninitialized memory in the scratch image. Most of the time the
	bug is harmless as the affected pixels are never used in the fitting
	process. However if the affected portion of memory happens to contain
	illegal floating point numbers then a crash may occur. Users are
	most likely to encounter this problem if they run the daophot
	test script daotest, although so far such crashes have only been
	reported for allstar under iraf 2.10.4 on the Dec Alpha.

STATUS:	Fixed for the next release of iraf and in the version of daophot in
	the external addon package digiphotx. The workaround is to set the
	readout noise to a positive number.