GBT Observing Statistics

Beginning with January 2004 the definition of the recorded astronomy hours changed. The new definitions are:

Scheduled hours is the number of hours scheduled on the telescope including any last minute changes.
Actual hours is recorded for astronomical observations only and is equal to the scheduled hours minus lost time for astronomy.
Lost time refers to the number of scheduled astronomy hours lost to weather, equipment failure or any cause which resulted in either no data being collected or the quality of data severely corrupted.
Holiday shutdown periods normally occur in November and December (usually 36 hours each month) and are not included in the numbers.

2001
2002
2003
2004
2005
2006
2007
2008
2009

2001

Month	Scheduled Hours			Actual Hours
Month	Astronomy Obs	Maint & Equip	Test & Cal	Astronomy Obs	Lost Time
January		207	3		*
February		171	229		*
March	10	191	227	10	*
April	10	180		11	*
May		191
June		189
July		191	79
August	26	207	291	44	*
September	116	171	353	175	*
October	62	177	413	67	*
November	27	155	322	33	*
December	50	138	471	68	*

* Lost time will be tracked when major commissioning effort ceases

2002

Month	Scheduled Hours			Actual Hours
Month	Astronomy Obs	Maint & Equip	Test & Cal	Astronomy Obs	Lost Time
January	106	159	453	118	*
February	45	150	478	45	*
March	121	144	465	164	*
April	147	160	407	174	*
May	124	159	285	168	*
June	163	138	422	210	*
July	250	162	334	299	*
August	236	158	324	249	*
September	216	199	307	235	*
October	114	162	345	126	*
November	245	117	322	243	*
December	199	143	366	206	*

* Lost time will be tracked when major commissioning effort ceases

2003

Month	Scheduled Hours			Actual Hours
Month	Astronomy Obs	Maint & Equip	Test & Cal	Astronomy Obs	Lost Time
January	51	136	550	62	*
February	206	171	232	238	*
March	345	151	228	402	*
April	384	163	174	386	50
May	374	140	230	387	59
June	403	184	120	409	56
July	320	224	200	329	28
August	350	189	204	379	20
September	343	186	192	362	31
October	358	133	240	379	21
November	349	99	237	355	53
December	367	121	220	376	57

* Lost time will be tracked when major commissioning effort ceases

2004

Month	Scheduled Hours			Actual Hours
Month	Astronomy Obs	Maint & Equip	Test & Cal	Astronomy Obs	Lost Time
January	557	68	119	462	95
February	414	71	211	343	71
March	478	81	185	424	54
April	433	79	208	395	38
May	417	121	206	382	35
June	356	209	155	338	18
July	409	203	132	363	45
August	400	201	143	370	30
September	392	201	127	349	43
October	442	107	195	402	40
November	423	58	203	397	26
December	482	63	163	447	35

2005

Month	Scheduled Hours			Actual Hours
Month	Astronomy Obs	Maint & Equip	Test & Cal	Astronomy Obs	Lost Time
January	529	66	149	466	62
February	460	64	148	401	59
March	505	67	172	434	71
April	492	91	137	454	38
May	551	67	126	536	15
June	465	182	73	445	20
July	520	159	65	495	25
August	434	202	108	413	21
September	507	81	132	490	17
October	545	54	155	521	24
November	478	60	146	448	30
December	537	44	128	477	60

2006

Month	Scheduled Hours			Actual Hours
Month	Astronomy Obs	Maint & Equip	Test & Cal	Astronomy Obs	Lost Time
January	571	65	108	519	52
February	529	63	80	460	69
March	613	50	81	583	30
April	622	60	38	592	30
May	610	51	83	592	18
June	484	174	62	475	9
July	557	144	43	533	24
August	468	199	77	453	15
September	563	83	74	554	9
October	593	70	81	566	27
November	526	64	94	510	16
December	589	59	58	563	26

2007

Month	Scheduled Hours			Actual Hours
Month	Astronomy Obs	Maint & Equip	Test & Cal	Astronomy Obs	Lost Time
January	635	61	48	595	40
February	569	48	55	470	99
March	634	59	51	568	66
April	625	60	35	558	67
May	526	218	0	500	26
June	373	343	4	367	6
July	509	187	48	504	5
August	241	219	284	230	11
September	302	51	367	292	10
October	617	50	77	593	24
November	573	71	41	537	36
December	591	66	51	530	61

2008

Month	Scheduled Hours			Actual Hours
Month	Astronomy Obs	Maint & Equip	Test & Cal	Astronomy Obs	Lost Time
January	620	71	53	594	26
February	600	50	46	542	58
March	654	61	29	627	27
April	633	61	26	610	23
May	638	63	43	616	22
June	545	164	11	513	32
July	538	180	26	488	50
August	538	169	37	520	18
September	618	65	37	601	17
October	633	73	38	605	28
November	567	54	99	509	58
December	561	62	121	505	56

2009

Month	Scheduled Hours			Actual Hours
Month	Astronomy Obs	Maint & Equip	Test & Cal	Astronomy Obs	Lost Time
January	624	45	75	551	73
February	551	67	54	497	54
March	635	58	51	596	39
April	606	72	42	577	29
May	635	57	53	609	26
June	491	183	46	468	23
July	529	164	50	509	20
August	542	148	54	532	10
September	504	171	45	493	11
October
November
December

The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Last updated 08 October 2009 by Carl Bignell