Tuorla blazar monitoring program

Optical light curves

Main characteristics

Principal investigators: K. Nilsson and E. Lindfors
Co-investigator: V. Fallah Ramazani
Data analysers: J. Jormanainen, V. Fallah Ramazani, E. Lindfors (current), E. Johtela, F. Wierda (current)

Telescopes used
- the 35 cm telescope at the KVA observatory, La Palma, Canary islands, Spain
- the 1.03 m telescope at Tuorla Observatory, Turku, Finland
- the 50 cm Searchlight Observatory Network telescope, San Pedro de Atacama, Chile
- the 40 cm Searchlight Observatory Network telescope, New Mexico, USA
- the 60 cm telesocpe at Belogradchik, Bulgaria
- the 2.56 m Nordic Optical Telescope, La Palma, Canary islands, Spain (current)
- the 80 cm Joan Oró Telescope at Montsec Astronomical Observatory, Spain (current)

All data were taken through the Cousins R-band filter.

The light curves have been grouped as follows:

"VHE gamma-ray emitting blazars and AGNs" : Blazars and AGNs listed in online catalog for very-high-energy gamma-Ray Astronomy (TeVCat) with declination > -31 deg.
"Other blazars and AGNs" : A collection of Blazars and other AGN.
"Fermi-LAT bright sources" : A collection of high-energy gamma-ray AGNs that are not currently being monitored.

The plots show the light curves of the object (purple) and the control star (green). The latter is used to check possible problems with the comparison star and the overall quality of the photometry. The data presented are one-hour averages.

Further notes on the tables :

The finding charts show 12 arcmin field of view around the targets, unless otherwise noted.
For some sources we have used our own preliminary calibration for the comparison stars.
For some sources the control star light curves (green points) have been shifted in the vertical direction to enable better scaling of the light curve.
In the "Obs epochs" column, the right end of the image corresponds to 12:00 UT on the date of the last update, left end to this date - 100 days.

Former observers: R. Bachev, A. Berdyugin, S. Ciprini, V. Fallah Ramazani, A. Halkola, C. Harlingten, T. Hovatta, J. Jormanainen, V. Kadenius, P. Kehusmaa, N. Koivisto, E. Lindfors, A. Nabizadeh, K. Nilsson, P. Nurmi, A. Oksanen, L. Ostorero, C. Palmroos, M. Pasanen, R. Reinthal, J. Saarinen, J. Sainio, A. Somero, A. Strigachev, L. O. Takalo, N. Talebpour Sheshvan, T. Tuominen, C. Villforth, T. Vornanen, S. Wagner, F. Wierda

Data policy

The light curves shown on these pages are intended as a quick-look service for the astronomy community. They are made public here to aid multiwavelength observational campaigns, which sometimes require quick response times. If you want to use some of the data for a publication, please do not extract the data from the images. Contact us and ask for the possibility of getting the data you need.

Data analysis procedure is available at K. Nilsson et al. (2018, A&A, 620, 185).
The first data realease (2002-2012) of 31 northern sky blazars is available at: Strasbourg astronomical Data Center (CDS-Vizier).

Light curves

Updated Mon 09 Feb 2026 01:32:56 PM UTC

FERMI-LAT bright targets

TeV blazars and AGNs
Name	Finding chart	Lightcurve		Obs epochs (last 100 days)	Days since last observation
1ES 0033+595	Find	Mag	Jy		27
S2 0109+22	Find	Mag	Jy		28
RGB 0136+391	Find	Mag	Jy		1
RGB 0214+517	Find	Mag	Jy		25
B2 0218+35	Find	Mag	Jy		1
3C 66A	Find	Mag	Jy		26
1ES 0229+200	Find	Mag	Jy		26
NGC 1275	Find	Mag	Jy		1
HB89 0317+185	Find	Mag	Jy		1
1ES 0414+009	Find	Mag	Jy		30
1ES 0502+675	Find	Mag	Jy		1
TXS 0506+056	Find	Mag	Jy		27
VER 0521+211	Find	Mag	Jy		25
VER 0648+151	Find	Mag	Jy		40
1ES 0647+250	Find	Mag	Jy		39
RGB 0710+591	Find	Mag	Jy		1
S5 0716+714	Find	Mag	Jy		1
NVSS J073326+515355	Find	Mag	Jy		1
1ES 0806+524	Find	Mag	Jy		1
RGB 0847+115	Find	Mag	Jy		1
OJ 287	Find	Mag	Jy		26
S4 0954+65	Find	Mag	Jy		28
1ES 1011+496	Find	Mag	Jy		28
1ES 1028+511	Find	Mag	Jy		28
RX J1058.5+2817	Find	Mag	Jy		27
Mkn 421	Find	Mag	Jy		27
Mkn 180	Find	Mag	Jy		28
RGB 1136+676	Find	Mag	Jy		27
4C 29.45	Find	Mag	Jy		26
ON 325	Find	Mag	Jy		26
1ES 1218+304	Find	Mag	Jy		27
ON 231	Find	Mag	Jy		27
MS 1221.8+2452	Find	Mag	Jy		27
ON 238	Find	Mag	Jy		27
ON 246	Find	Mag	Jy		29
3C 279	Find	Mag	Jy		27
B2 1308+32.6	Find	Mag	Jy		29
PKS 1413+135	Find	Mag	Jy		346
RGB 1417+257	Find	Mag	Jy		29
B2 1420+32	Find	Mag	Jy		29
PG 1424+240	Find	Mag	Jy		29
1ES 1426+428	Find	Mag	Jy		29
1ES 1440+122	Find	Mag	Jy		26
PKS 1441+25	Find	Mag	Jy		40
PKS 1510-089	Find	Mag	Jy		26
PG 1553+113	Find	Mag	Jy		26
Mkn 501	Find	Mag	Jy		28
H 1722+119	Find	Mag	Jy		8
OT 546	Find	Mag	Jy		29
1ES 1741+196	Find	Mag	Jy		29
HB89 1749+096	Find	Mag	Jy		8
B2 1811+31	Find	Mag	Jy		29
1ES 1959+650	Find	Mag	Jy		28
MG4 J200112+4352	Find	Mag	Jy		41
1ES 2037+521	Find	Mag	Jy		8
BL Lac	Find	Mag	Jy		25
RGB J2243+203	Find	Mag	Jy		27
B3 2247+381	Find	Mag	Jy		28
1ES 2344+514	Find	Mag	Jy		27

Other blazars and AGN
Name	Finding chart	Lightcurve		Obs epochs (last 100 days)	Days since last observation
RX J00352+1515	Find	Mag	Jy		31
4C+31.03	Find	Mag	Jy		8
3FHL J0134.4+2638	Find	Mag	Jy		9
CGRaBS J0211+1051	Find	Mag	Jy		8
B2 0234+28	Find	Mag	Jy		9
AO 0235+164	Find	Mag	Jy		8
PKS 0310+013	Find	Mag	Jy		8
RX J03384+1302	Find	Mag	Jy		9
RGB 0505+612	Find	Mag	Jy		30
3FHL J0601.0+3837	Find	Mag	Jy		1
B2 0716+33	Find	Mag	Jy		39
PKS 0735+178	Find	Mag	Jy		40
3FHL J0746.3-0225	Find	Mag	Jy		38
CRATES J0905+1358	Find	Mag	Jy		29
PMN 0953-0840	Find	Mag	Jy		29
RX J1022.7-0112	Find	Mag	Jy		29
RBS 0921	Find	Mag	Jy		29
RBS 0970	Find	Mag	Jy		29
TON 116	Find	Mag	Jy		29
PG 1246+586	Find	Mag	Jy		29
S4 1250+53	Find	Mag	Jy		29
B2 1348+308	Find	Mag	Jy		39
PKS 1406-076	Find	Mag	Jy		29
3FHL J1418.4-0233	Find	Mag	Jy		8
RBS 1409	Find	Mag	Jy		130
PKS 1502+106	Find	Mag	Jy		355
3FHL J1511.8-0513	Find	Mag	Jy		39
BZQ J1514+4450	Find	Mag	Jy		27
3FHL J1520.7-0348	Find	Mag	Jy		27
1ES 1544+820	Find	Mag	Jy		28
3FHL J1546.1+0818	Find	Mag	Jy		28
CRATES J1558+5625	Find	Mag	Jy		39
FGL 1656+6012	Find	Mag	Jy		27
RGB J1754+322	Find	Mag	Jy		8
GB6 J1838+4802	Find	Mag	Jy		27
GB6 B1842+1543	Find	Mag	Jy		63
RGB 1903+556	Find	Mag	Jy		26
3FHL J1942.7+1033	Find	Mag	Jy		60
3FHL J2156.0+1818	Find	Mag	Jy		30
RGB J2232+117	Find	Mag	Jy		30
TXS 2241+406	Find	Mag	Jy		9
3C 454.3	Find	Mag	Jy		29