Properties of SN candidates in MS1054.4-0321:

Candidate 1:

Detected in March 1996 data-set. Absent in images from May 1998.
Appears on 6 x 2600 F814W images, taken over ~ 8 hrs.

Flux measurement:

Total exposure time 15600.
Total flux in object ~450 counts.
Flambda = (450/15600) x 2.5e-18 = 7.211e-20 [erg/(sec x cm2 x Ang)]
Fnu = Flambda x (lambda2 / c [Ang/sec]) = 1.515e-30 [erg/(sec cm2 Hz)] 
I814 = -2.5 log(Fnu) - 48.6 = 25.95

Coordinates:

Cluster coordinates: R.A: 10:57:00.2 (2000) DEC: -03:37:27.4
No apparent host.

Candidate 2:

Detected in March 1996 data-set. Absent in images from May 1998.
Appears on 6 x 2600 F814W images, taken over ~ 8 hrs.

Flux measurement:

Total exposure time 15600.
Total flux in object ~280 counts.
Flambda = (280/15600) x 2.5e-18 = 4.487e-20 [erg/(sec x cm2 x Ang)]
Fnu = Flambda x (lambda2 / c [Ang/sec]) = 9.430e-31 [erg/(sec cm2 Hz)] 
I814 = -2.5 log(Fnu) - 48.6 = 26.46

Coordinates:

Cluster coordinates: R.A: 10:57:00.2 (2000) DEC: -03:37:27.4
Host galaxy coordinates:
Host redshift/color:
SN coordinates:

Candidate 3:

Detected in March 1996 data-set. Absent in images from May 1998.
Appears on 6 x 2600 F814W images, taken over ~ 8 hrs.

Type: probably Ia within few weeks from peak, due to high observed magnitude.
  
Flux measurement:

Total exposure time 15600.
Total flux in object ~2965 counts.
Flambda = (2965/15600) x 2.5e-18 = 4.752e-19 [erg/(sec x cm2 x Ang)]
Fnu = Flambda x (lambda2 / c [Ang/sec]) = 9.985e-30 [erg/(sec cm2 Hz)] 
I814 = -2.5 log(Fnu) - 48.6 = 23.90

Coordinates:

Cluster coordinates: R.A: 10:57:00.2 (2000) DEC: -03:37:27.4
Host galaxy coordinates:
Host redshift/color: Color consistent with cluster membership
                     (ApJ 475 20 1997)
SN coordinates: