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Supernova Cosmology Project 2004 Search for distant Type Ia Supernovae

The SCP is conducting a search for very distant (redshifts greater than 1.2) Type Ia supernovae using the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. We are searching on the same area of sky covered by the GOODS-N survey (Giavalisco et al. 2003), which is roughly centered on the Hubble Deep Field North (Williams et al. 1996). Observations are divided into four search epochs separated by approximately 50 days.Each of the four searches is comprised of 15 ACS pointings which cover a total of 170 square arcminutes. Variable objects, such as high redshift supernovae, are identified by subtracting the 2003 GOODS-N ACS imaging from the new search images. For the second, third, and fourth searches,the previous search epochs provide additional information useful for determining which supernovae were discovered before maximum light, making them suitable candidates for the subsequent follow-up. Supernovae will be reported via IAU Circulars and this web page. This search is done in coordination with the STScI Higher-z Team, with both teams searching independently, comparing results, and then following different supernovae.

First search: April 2004

Report on April Search Result

April Search Candidates:  Epoch 1: UT 2 April 2004 - 4 April 2004 (sorted by RA)

SCP ID
IAU PSN   
Discovery Date (UT)
RA(J2000)
DEC(J2000)
z' mag (Vega)
i' mag (Vega)
acs04-193 K0404-004
Apr. 02.74 12 36 19.86 +62 13 48.0 25.1 25.5
acs04-177 K0404-001
Apr. 02.08 12 36 20.90 +62 10 19.6 25.4 26.3
acs04-176 K0404-002
Apr. 02.08 12 36 25.93 +62 09 37.4 23.7 **
acs04-194 K0404-005
Apr. 02.74 12 36 27.07 +62 15 09.6 24.4 25.1
acs04-185 K0404-003
Apr. 02.08 12 36 29.44 +62 11 41.9 24.4 24.3
acs04-186 K0404-010
Apr. 04.71 12 36 46.07 +62 16 25.7 25.8 **
acs04-181 K0404-011
Apr. 04.71 12 36 49.36 +62 16 04.8 24.9 25.7
acs04-196 K0404-006
Apr. 03.40 12 37 06.73 +62 21 17.8 25.4 25.7
acs04-076 K0404-007
Apr. 03.40 12 37 09.44 +62 22 15.6 25.1 26.5
acs04-197 K0404-009
Apr. 03.54 12 37 21.32 +62 09 35.2 25.7 >26.5
acs04-195 K0404-008
Apr. 03.34 12 38 03.58 +62 17 11.9 24.7 25.2

CBAT Possible-Supernovae Page

Supernova Cosmology Project  Search Team:
Robert KnopRachel Gibbons,  S. Perlmutter, G. Aldering, M. Doi, V. Fadeyev, G. Goldhaber, A. Goobar,  N.Kashikawa,  M. Kowalski, N. Kuznetsova, T. Morokuma, A. Spadafora, V. Stanishev, L. Wang, N. Yasuda.

APRIL Candidates:
acs04-193
acs04-177
acs04-176176
acs04-194
acs04-185
acs04-186
acs04-181
acs04-196
acs04-076
acs04-197
acs04-195


updated 05-May-2004. A. Spadafora