diff --git a/content/04-gravitational-waves-example.ipynb b/content/04-gravitational-waves-example.ipynb
deleted file mode 100644
index 6a144bb..0000000
--- a/content/04-gravitational-waves-example.ipynb
+++ /dev/null
@@ -1,71 +0,0 @@
-{
- "cells": [
-  {
-   "attachments": {},
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "# Gravitational Waves Events with the VO tools"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "from js import fetch\n",
-    "from io import BytesIO\n",
-    "from astropy.io.votable import parse_single_table"
-   ]
-  },
-  {
-   "attachments": {},
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "We first interogate the Simbad database for all the known gravitational waves events. "
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "simbad_url = \"https://simbad.cds.unistra.fr/simbad/sim-tap/sync?\"\n",
-    "\n",
-    "TAP_query = \"SELECT * from basic WHERE otype = 'GWE'\"\n",
-    "\n",
-    "query_url = f\"{simbad_url}request=doQuery&lang=adql&format=votable&query={TAP_query}\""
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "result_TAP_query = await fetch(query_url)\n",
-    "votable_result = await BytesIO(result_TAP_query.text().encode('utf8'))\n",
-    "gravitational_waves_table = parse_single_table(votable_result).to_table()\n",
-    "gravitational_waves_table"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
-  }
- ],
- "metadata": {
-  "language_info": {
-   "name": "python"
-  },
-  "orig_nbformat": 4
- },
- "nbformat": 4,
- "nbformat_minor": 2
-}