diff --git a/gcn_classic_to_json/notices/LVC_INITIAL/__init__.py b/gcn_classic_to_json/notices/LVC_INITIAL/__init__.py
new file mode 100644
index 0000000..e7df870
--- /dev/null
+++ b/gcn_classic_to_json/notices/LVC_INITIAL/__init__.py
@@ -0,0 +1,11 @@
+from ..LVC_PRELIMINARY import parse as parse_lvc_prelim
+
+
+def parse(bin):
+    property_bytes = bin[20:21].view(dtype=">u2")
+    prob_ns, prob_remnant = property_bytes * 1e-2
+    return {
+        **parse_lvc_prelim(bin),
+        "alert_type": "initial",
+        "properties": ({"NS": prob_ns}, {"REMNANT": prob_remnant}),
+    }
diff --git a/gcn_classic_to_json/notices/LVC_INITIAL/example.json b/gcn_classic_to_json/notices/LVC_INITIAL/example.json
new file mode 100644
index 0000000..9bef814
--- /dev/null
+++ b/gcn_classic_to_json/notices/LVC_INITIAL/example.json
@@ -0,0 +1,43 @@
+{
+  "mission": "LVC",
+  "alert_tense": "test",
+  "messenger": "GW",
+  "trigger_time": "2024-05-11T22:40:30.203Z",
+  "id": [
+    "MS240511w"
+  ],
+  "record_number": 3,
+  "fluence": null,
+  "peak_frequency": null,
+  "far": 9.111712330429193e-14,
+  "pipeline_type": "GSTLAL",
+  "search_type": "MockDataChallenge",
+  "group_type": "CBC",
+  "duration": null,
+  "p_astro": 1.0,
+  "classification": [
+    {
+      "TERRESTRIAL": 0.0
+    },
+    {
+      "BBH": 0.0
+    },
+    {
+      "BNS": 1.0
+    },
+    {
+      "NSBH": 0.0
+    }
+  ],
+  "properties": [
+    {
+      "NS": 1.0
+    },
+    {
+      "REMNANT": 1.0
+    }
+  ],
+  "skymap_url": "https://gracedb.ligo.org/superevents/MS240511w/files/bayestar.multiorder.fit",
+  "additional_info": "This is a test Notice.\nThis event is an Open Alert.\nLIGO-Handford Observatory contributed to this candidate event.\nLIGO-Livingston Observatory contributed to this candidate event.\nThis Notice was ground-generated.\n",
+  "alert_type": "initial"
+}
diff --git a/gcn_classic_to_json/notices/LVC_PRELIMINARY/__init__.py b/gcn_classic_to_json/notices/LVC_PRELIMINARY/__init__.py
new file mode 100644
index 0000000..0269a64
--- /dev/null
+++ b/gcn_classic_to_json/notices/LVC_PRELIMINARY/__init__.py
@@ -0,0 +1,159 @@
+import numpy as np
+
+from ... import utils
+
+pipeline_opts = [
+    "undefined/illegal",
+    "MTBAOnline",
+    "CWB",
+    "CWB2G",
+    "GSTLAL",
+    "GSTLAL_Spiir",
+    "Hardware Injection",
+    "X",
+    "Q",
+    "Omega",
+    "Ringdown",
+    "LIB",
+    "Fermi",
+    "Swift",
+    "SNEWS",
+    "pycbc",
+]
+
+search_opts = [
+    "undefined/illegal",
+    "AllSky",
+    "LowMass",
+    "HighMass",
+    "GRB",
+    "Supernova",
+    "MockDataChallenge",
+    "AllSkyLong",
+    "BBH",
+]
+
+group_opts = ["undefined/illegal", "CBC", "Burst", "Test"]
+
+trig_id_description = {
+    1: "This is a test Notice.\n",
+    2: "This is a hardware injection event.\n",
+    3: "This event has been vetted by a human.\n",
+    4: "This event is an Open Alert.\n",
+    5: "This is definitely a retraction.\n",
+    29: "There was a temporal coincidence with another event.\n",
+}
+
+misc_descriptions = {
+    0: "LIGO-Handford Observatory contributed to this candidate event.\n",
+    1: "LIGO-Livingston Observatory contributed to this candidate event.\n",
+    2: "Virgo Observatory contributed to this candidate event.\n",
+    3: "GEO600 Observatory contributed to this candidate event.\n",
+    4: "KAGRA Observatory contributed to this candidate event.\n",
+    5: "LIGO-India Observaiory contributed to this candidate event.\n",
+}
+
+prefix_letters = [
+    "G",
+    "T",
+    "M",
+    "Y",
+    "H",
+    "E",
+    "K",
+    "S",
+    "GW",
+    "TS",
+    "TGW",
+    "MS",
+    "MGW",
+]
+
+invalid_prob_descriptions = {
+    0: "Probability of NS is invalid.\n",
+    1: "Probability of REMNANT is invalid.\n",
+    2: "Probability of BNS is invalid.\n",
+    3: "Probability of NSBH is invalid.\n",
+    4: "Probability of BBH is invalid.\n",
+    5: "Probability of Mass Gap is invalid.\n",
+    6: "Probability of TERRESTRIAL is invalid.\n",
+}
+
+
+def parse(bin):
+    bin[7:9]  # Intentionally Omitted. RA/Dec is set to zero due to large localization.
+    bin[15:18]  # Spare. According to Docs: '12 bytes for the future'
+    bin[20]  # Unused. According to Docs: Not present in preliminary notice type.
+    bin[24:29]  # Spare. According to Docs: '20 bytes for the future'
+
+    event_type_bytes = np.flip(bin[12:13].view(dtype="u1"))
+    pipeline_num, search_num, group_num, _ = event_type_bytes
+
+    fluence = 10 ** (bin[9] * 1e-4) * 1e3
+    peak_freq = bin[10] * 1e-2
+    duration = bin[14] * 1e-2
+
+    trig_id_bits = np.flip(np.unpackbits(bin[18:19].view(dtype="u1")))
+
+    misc_bits = np.flip(np.unpackbits(bin[19:20].view(dtype="u1")))
+
+    first_suffix = chr(np.packbits(np.flip(misc_bits[10:18]))[0])
+    prefix = prefix_letters[
+        np.packbits(np.pad(np.flip(misc_bits[20:24]), (4, 0)))[0] - 1
+    ]
+    seq_num = np.packbits(np.flip(misc_bits[24:32]))[0]
+
+    mass_gap_and_letters_bytes = np.flip(bin[21:22].view(dtype="u1"))
+    second_suffix = chr(np.packbits(mass_gap_and_letters_bytes[0])[0])
+    prob_mass_gap = mass_gap_and_letters_bytes[3] * 1e-2
+
+    class_prob_bytes = bin[22:23].view(dtype="u1")
+    prob_bns, prob_nsbh, prob_bbh, prob_terrestrial = class_prob_bytes * 1e-2
+
+    prob_invalid_flags_bits = np.flip(np.unpackbits(bin[23:24].view(dtype="u1")))
+
+    comments = ""
+    comments += "".join(
+        [val for (key, val) in trig_id_description.items() if trig_id_bits[key]]
+    )
+    comments += "".join(
+        [val for (key, val) in misc_descriptions.items() if misc_bits[key]]
+    )
+    comments += (
+        "This Notice was ground-generated.\n"
+        if misc_bits[19]
+        else "This Notice was flight-generated.\n"
+    )
+    comments += "".join(
+        [
+            val
+            for (key, val) in invalid_prob_descriptions.items()
+            if prob_invalid_flags_bits[key]
+        ]
+    )
+
+    return {
+        "mission": "LVC",
+        "alert_tense": "test" if trig_id_bits[1] else "current",
+        "messenger": "GW",
+        "trigger_time": utils.datetime_to_iso8601(bin[5], bin[6] + (bin[13] * 1e-4)),
+        "id": [(prefix + str(bin[4]) + first_suffix + second_suffix).strip("\u0000")],
+        "record_number": seq_num,
+        "fluence": fluence if group_num == 2 else None,
+        "peak_frequency": peak_freq if group_num == 2 else None,
+        "far": 10 ** (bin[11] * 1e-4),
+        "pipeline_type": pipeline_opts[pipeline_num],
+        "search_type": search_opts[search_num],
+        "group_type": group_opts[group_num],
+        "duration": duration if group_num == 2 else None,
+        "p_astro": 1 - prob_terrestrial,
+        "classification": (
+            {"TERRESTRIAL": prob_terrestrial},
+            {"BBH": prob_bbh},
+            {"BNS": prob_bns},
+            {"NSBH": prob_nsbh},
+        ),
+        "properties": ({"Mass Gap": prob_mass_gap},),
+        "skymap_url": f"https://gracedb.ligo.org/superevents/{utils.binary_to_string(bin[29:39])}",
+        "additional_info": comments if comments else None,
+    }
diff --git a/gcn_classic_to_json/notices/LVC_PRELIMINARY/example.json b/gcn_classic_to_json/notices/LVC_PRELIMINARY/example.json
new file mode 100644
index 0000000..5f9f8a6
--- /dev/null
+++ b/gcn_classic_to_json/notices/LVC_PRELIMINARY/example.json
@@ -0,0 +1,39 @@
+{
+  "mission": "LVC",
+  "alert_tense": "test",
+  "messenger": "GW",
+  "trigger_time": "2024-05-10T05:47:17.764Z",
+  "id": [
+    "MS240510f"
+  ],
+  "record_number": 1,
+  "fluence": null,
+  "peak_frequency": null,
+  "far": 9.31536765238572e-16,
+  "pipeline_type": "GSTLAL",
+  "search_type": "MockDataChallenge",
+  "group_type": "CBC",
+  "duration": null,
+  "p_astro": 1.0,
+  "classification": [
+    {
+      "TERRESTRIAL": 0.0
+    },
+    {
+      "BBH": 0.0
+    },
+    {
+      "BNS": 1.0
+    },
+    {
+      "NSBH": 0.0
+    }
+  ],
+  "properties": [
+    {
+      "Mass Gap": 0.0
+    }
+  ],
+  "skymap_url": "https://gracedb.ligo.org/superevents/MS240510f/files/bayestar.multiorder.fit",
+  "additional_info": "This is a test Notice.\nThis event is an Open Alert.\nLIGO-Handford Observatory contributed to this candidate event.\nLIGO-Livingston Observatory contributed to this candidate event.\nVirgo Observatory contributed to this candidate event.\nThis Notice was ground-generated.\n"
+}
diff --git a/gcn_classic_to_json/notices/LVC_RETRACTION/__init__.py b/gcn_classic_to_json/notices/LVC_RETRACTION/__init__.py
new file mode 100644
index 0000000..51d887c
--- /dev/null
+++ b/gcn_classic_to_json/notices/LVC_RETRACTION/__init__.py
@@ -0,0 +1,114 @@
+import numpy as np
+
+from ... import utils
+
+pipeline_opts = [
+    "undefined/illegal",
+    "MTBAOnline",
+    "CWB",
+    "CWB2G",
+    "GSTLAL",
+    "GSTLAL_Spiir",
+    "Hardware Injection",
+    "X",
+    "Q",
+    "Omega",
+    "Ringdown",
+    "LIB",
+    "Fermi",
+    "Swift",
+    "SNEWS",
+    "pycbc",
+]
+
+search_opts = [
+    "undefined/illegal",
+    "AllSky",
+    "LowMass",
+    "HighMass",
+    "GRB",
+    "Supernova",
+    "MockDataChallenge",
+    "AllSkyLong",
+    "BBH",
+]
+
+group_opts = ["undefined/illegal", "CBC", "Burst", "Test"]
+
+trig_id_description = {
+    1: "This is a test Notice.\n",
+    2: "This is a hardware injection event.\n",
+    3: "This event has been vetted by a human.\n",
+    4: "This event is an Open Alert.\n",
+    5: "This is definitely a retraction.\n",
+    29: "There was a temporal coincidence with another event.\n",
+}
+
+misc_descriptions = {
+    0: "LIGO-Handford Observatory contributed to this candidate event.\n",
+    1: "LIGO-Livingston Observatory contributed to this candidate event.\n",
+    2: "Virgo Observatory contributed to this candidate event.\n",
+    3: "GEO600 Observatory contributed to this candidate event.\n",
+    4: "KAGRA Observatory contributed to this candidate event.\n",
+    5: "LIGO-India Observaiory contributed to this candidate event.\n",
+}
+
+prefix_letters = [
+    "G",
+    "T",
+    "M",
+    "Y",
+    "H",
+    "E",
+    "K",
+    "S",
+    "GW",
+    "TS",
+    "TGW",
+    "MS",
+    "MGW",
+]
+
+
+def parse(bin):
+    bin[7:13]  # Spare. According to Docs:'24 bytes for the future'
+    bin[14:18]  # Spare. According to Docs:'16 bytes for the future'
+    bin[20:29]  # Spare. According to Docs:'36 bytes for the future'
+
+    trig_id_bits = np.flip(np.unpackbits(bin[18:19].view(dtype="u1")))
+
+    misc_bits = np.flip(np.unpackbits(bin[19:20].view(dtype="u1")))
+
+    first_suffix = chr(np.packbits(np.flip(misc_bits[10:18]))[0])
+    prefix = prefix_letters[
+        np.packbits(np.pad(np.flip(misc_bits[20:24]), (4, 0)))[0] - 1
+    ]
+    seq_num = np.packbits(np.flip(misc_bits[24:32]))[0]
+
+    letter_bytes = np.flip(bin[21:22].view(dtype="u1"))
+    second_suffix = chr(np.packbits(letter_bytes[0])[0])
+
+    comments = ""
+    comments += "".join(
+        [val for (key, val) in trig_id_description.items() if trig_id_bits[key]]
+    )
+    comments += "".join(
+        [val for (key, val) in misc_descriptions.items() if misc_bits[key]]
+    )
+    comments += (
+        "This Notice was ground-generated.\n"
+        if misc_bits[19]
+        else "This Notice was flight-generated.\n"
+    )
+
+    return {
+        "mission": "LVC",
+        "alert_tense": "test" if trig_id_bits[1] else "current",
+        "messenger": "GW",
+        "alert_type": "retraction",
+        "trigger_time": utils.datetime_to_iso8601(bin[5], bin[6] + (bin[13] * 1e-4)),
+        "id": [(prefix + str(bin[4]) + first_suffix + second_suffix).strip("\u0000")],
+        "record_number": seq_num,
+        "skymap_url": f"https://gracedb.ligo.org/superevents/{utils.binary_to_string(bin[29:39])}",
+        "additional_info": comments if comments else None,
+    }
diff --git a/gcn_classic_to_json/notices/LVC_RETRACTION/example.json b/gcn_classic_to_json/notices/LVC_RETRACTION/example.json
new file mode 100644
index 0000000..fc9949d
--- /dev/null
+++ b/gcn_classic_to_json/notices/LVC_RETRACTION/example.json
@@ -0,0 +1,13 @@
+{
+  "mission": "LVC",
+  "alert_tense": "test",
+  "messenger": "GW",
+  "alert_type": "retraction",
+  "trigger_time": "2024-05-11T08:38:21.988Z",
+  "id": [
+    "MS240511i"
+  ],
+  "record_number": 3,
+  "skymap_url": "https://gracedb.ligo.org/superevents/",
+  "additional_info": "This is a test Notice.\nThis event is an Open Alert.\nThis is definitely a retraction.\nThis Notice was ground-generated.\n"
+}
diff --git a/gcn_classic_to_json/notices/LVC_UPDATE/__init__.py b/gcn_classic_to_json/notices/LVC_UPDATE/__init__.py
new file mode 100644
index 0000000..1dc7b78
--- /dev/null
+++ b/gcn_classic_to_json/notices/LVC_UPDATE/__init__.py
@@ -0,0 +1,11 @@
+from ..LVC_PRELIMINARY import parse as parse_lvc_prelim
+
+
+def parse(bin):
+    property_bytes = bin[20:21].view(dtype=">u2")
+    prob_ns, prob_remnant = property_bytes * 1e-2
+    return {
+        **parse_lvc_prelim(bin),
+        "alert_type": "update",
+        "properties": ({"NS": prob_ns}, {"REMNANT": prob_remnant}),
+    }
diff --git a/gcn_classic_to_json/notices/LVC_UPDATE/example.json b/gcn_classic_to_json/notices/LVC_UPDATE/example.json
new file mode 100644
index 0000000..33164d5
--- /dev/null
+++ b/gcn_classic_to_json/notices/LVC_UPDATE/example.json
@@ -0,0 +1,43 @@
+{
+  "mission": "LVC",
+  "alert_tense": "current",
+  "messenger": "GW",
+  "trigger_time": "2024-05-14T12:17:13.721Z",
+  "id": [
+    "S240514x"
+  ],
+  "record_number": 4,
+  "fluence": null,
+  "peak_frequency": null,
+  "far": 3.1681081593280504e-10,
+  "pipeline_type": "pycbc",
+  "search_type": "AllSky",
+  "group_type": "CBC",
+  "duration": null,
+  "p_astro": 1.0,
+  "classification": [
+    {
+      "TERRESTRIAL": 0.0
+    },
+    {
+      "BBH": 1.0
+    },
+    {
+      "BNS": 0.0
+    },
+    {
+      "NSBH": 0.0
+    }
+  ],
+  "properties": [
+    {
+      "NS": 0.0
+    },
+    {
+      "REMNANT": 0.0
+    }
+  ],
+  "skymap_url": "https://gracedb.ligo.org/superevents/S240514x/files/Bilby.multiorder.fits,0",
+  "additional_info": "This event is an Open Alert.\nLIGO-Handford Observatory contributed to this candidate event.\nLIGO-Livingston Observatory contributed to this candidate event.\nVirgo Observatory contributed to this candidate event.\nThis Notice was ground-generated.\n",
+  "alert_type": "update"
+}