VERITAS Blazar Monitoring Program

VERITAS regularly monitors a set of very high energy (VHE) blazars. Our goal is to build a deep archival data set on these sources. Observations will be scheduled at regular intervals. Note that observation scheduling may vary depending on the weather conditions, visibility, and for other reasons. The following table shows the list of regularly-monitored blazars. Click on a source name to open the list of VERITAS observation windows since 2009 to present.

Source RA (J2000)
hh mm ss.ss
DEC (J2000)
dd mm ss.ss
1ES 0229+200 02 32 48.59 +20 17 16.92
RGB J0710+591 07 10 30.10 +59 08 20.96
1ES 1218+304 12 21 21.9 +30 10 36.99
PKS 1424+240 14 27 00.4 +23 47 59.93
H 1426+428 14 28 32.6 +42 40 28.91
3C 66A 02 22 39.6 +43 02 07.97
W Comae 12 21 31.7 +28 13 59.05
BL Lac 22 02 43.3 +42 16 39.91
Mrk 421 11 04 27.30 +38 12 32.02
Mrk 501 16 53 52.19 +39 45 37.05
M87 12 30 49.40 +12 23 28.10
1ES 0414+009 04 16 53.00 +01 04 54.07
1ES 0502+675 05 07 56.30 +67 37 24.04

VERITAS also performs shallow observations of all VHE blazars with good visibility to VERITAS that are not explicitly summarized above. Our goal is to build at least 10 hours of exposure on each known northern VHE blazar by 2019. Generally VERITAS observes each of these blazars eight times per year. Each observations is typically 15 minutes long.

Coordinated observations with Swift

VERITAS and Swift perform coordinated multiwavelength observations on selected blazars. The following table shows the scheduled dates for the upcoming simultaneous observations.

VERITAS Blazars Scheduled for simultaneous observations with Swift
Source NameScheduled Date
H1426+428 2017-06-15
Mrk 501 2017-06-17
Mrk 501 2017-06-20
Mrk 501 2017-06-23
Mrk 501 2017-06-26
BL Lac 2017-06-24
BL Lac 2017-07-02

Table Last updated 2021-06-17 04:27:03.176491

Note that the observation schedule might vary dependent on weather conditions and for other reasons. If you are interested in organizing a joint multiwavelength campaign with VERITAS please contact theVERITAS spokesperson