diff --git a/plans/README.md b/plans/README.md
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+# Observing plans and the T33 session runbook
+
+ACP observing plans for iTelescope scopes, plus the procedure to run one on T33
+(the free Siding Spring scope). Credentials are NOT in this repo: they live in
+the local claudetemp itelescope folder (creds.txt, `username=`/`password=` lines).
+
+## Plan format (ACP)
+
+See [ngc104-test.txt](ngc104-test.txt). Directives, then a target line:
+`Name<TAB>RA_decimal_hours<TAB>Dec_decimal_degrees`. Counts, intervals, binning
+and filters are parallel comma-separated lists. `#shutdown` parks safely at the
+end (iTelescope's own one-click plans do the same).
+
+## T33 endpoints (base http://t33.itelescope.net:8033, HTTP auth = iTelescope creds)
+
+| Purpose | Path |
+|---|---|
+| Status JSON (times, obsStat, obsOwner) | /ac/SystemStatus/asystemstatus.asp |
+| Console text | /ac/SystemStatus/aconsread.asp |
+| Scope connect control | /ac/SystemStatus/ascopeconn.asp |
+| Shutter/roof status | /ac/SystemStatus/ashutterctl.asp |
+| My plan folder (list/upload/delete) | /plans/qisback/aindex.asp, aupload.asp, adelfile.asp |
+| Run a plan ("Acquire Images") | POST /ac/Plans/plan.asp |
+| My logs | /logs/qisback/aindex.asp |
+| Finished data | data.itelescope.net |
+
+Upload: multipart POST to `/plans/qisback/aupload.asp`, fields `File1` (the file)
+and `DestPath=/plans/qisback`. Verified working 2026-07-18; content round-trips
+exactly.
+
+Run: the web UI posts the plan select to `/ac/Plans/plan.asp`; the select's value
+is the WINDOWS path `C:\ProgramData\ACP\ACP Web Data\Doc Root\plans\qisback\<file>`.
+Field names seen: `plan`, optional `VPhot`, `AutoLogoff`. NOT yet exercised live
+(observatory was closed, daytime); the first live session must confirm whether a
+scope-connect POST (ascopeconn.asp) is required first, and capture the exact
+response shape.
+
+## The 47 Tuc free-session test (ngc104-test.txt)
+
+- Target: NGC 104 / 47 Tucanae, RA 0.4015 h, Dec -72.0814 deg (circumpolar at SSO).
+- L 4x120 s, RGB 2x90 s each, Bin2: about 17 min exposure, about 24 min with
+  overhead, inside the daily free 30 minutes.
+- Uploaded to /plans/qisback/ on 2026-07-18 and verified.
+
+### When to run
+
+47 Tuc clears T33's 20 degree minimum elevation in the second half of the SSO
+night. SSO local = UTC+10; the good window is roughly 14:00-19:30 UTC (UK
+afternoon/evening). Sunrise at SSO was 06:14 local (20:14 UTC) at recon time;
+stop well before dawn.
+
+### Procedure
+
+1. GET asystemstatus.asp: confirm observatory open (obsStat) and no other user
+   (obsOwner n/a). If someone is on, wait and retry; T33 is first-come.
+2. Confirm the plan file is still in /plans/qisback/ (aindex.asp).
+3. POST plan.asp with the plan's Windows path to start acquisition.
+4. Poll aconsread.asp (console) every minute or two: slew, centering, filter
+   changes, exposures. The run self-terminates via #shutdown.
+5. Images land in /images/qisback/ on the scope server and then on
+   data.itelescope.net; logs in /logs/qisback/.
+6. Record the session outcome in state/NOTES.md.
+
+Abort path if something looks wrong: the web UI exposes an abort on the console
+page; locate it live before starting exposures (not yet mapped).
diff --git a/plans/ngc104-test.txt b/plans/ngc104-test.txt
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@@ -0,0 +1,12 @@
+;
+; 47 Tucanae (NGC 104) free-session test plan for qisback
+; L 4x120s, RGB 2x90s each, Bin2. ~17 min exposure, ~24 min with overhead.
+;
+#largepreviews
+#tiff
+#count 4,2,2,2
+#interval 120,90,90,90
+#binning 2,2,2,2
+#filter Luminance,Red,Green,Blue
+NGC104	0.401500	-72.081389
+#shutdown
diff --git a/state/TODO.md b/state/TODO.md
index ffc7f9c..b88c381 100644
--- a/state/TODO.md
+++ b/state/TODO.md
@@ -15,7 +15,11 @@
 
 ## In progress
 
-- (nothing)
+- T33 first-light test: ngc104-test.txt (47 Tuc, ~24 min LRGB) uploaded to
+  /plans/qisback/ on T33 and verified. Run window: 2026-07-19 roughly 14:00-19:30
+  UTC when 47 Tuc clears the 20 degree limit. Procedure in plans/README.md.
+  Remaining: live-run the plan (confirm the plan.asp POST and any scope-connect
+  step), monitor via console, pull images/logs, record outcome in NOTES.
 
 ## Pending