|
site map
- Home
- About
- Support
- Data Access
- Data Analysis
- Data Products
- Publications
-
Links
Databases NED Simbad GCN circulars archive GRB data table Software & Tools Swift Software (HEASoft) Xanadu WebPIMMS Institutional Swift Sites GSFC PSU OAB SSDC MSSL University of Leicester
Swift Trigger: 517469;
Presumed name: GRB 120311A
| BAT | 18h 12m 20.88s, +14° 16′ 30.0″ |
|---|---|
| position: | (273.087, 14.275 ± 180″) |
| XRT | 18h 12m 21.52s, +14° 17′ 49.5″ |
| position: | (273.08966, 14.29709 ± 3.7″) |
| UVOT | 18h 12m 24.89s, +14° 13′ 29.3″ |
| position: | (273.1037, +14.2248 ± 1.1″) |
| Galactic NHI: | 1.03×1021 cm-2 |
| Galactic E(B-V): | 0.139 mag |
| Best RA: | 18h 12m 24.89s | = 273.1037 d |
|---|---|---|
| Best Dec: | +14° 13′ 29.3″ | = +14.2248 d |
| Gal Lat: | 15.01 | |
| Gal Long: | 41.55 | |
| Sun angle: | 79.82°, 5.2 hr West | |
1Sper #12 auto processing.
Galaxies within 3.33 of XRT position
| RA* | Dec* | Redshift | Catalogue | Query | ||
|---|---|---|---|---|---|---|
| 22.1 | 273.0934 | 14.3021 | B2=20.6, R2=19.5 | USNO-B1 |  | |
| 27.0 | 273.0822 | 14.2952 | I=18.0, R1=18.0 | USNO-B1 | | |
| 28.1 | 273.0819 | 14.2949 | B1=17.8, B2=17.9, I=17.0, R1=16.4, R2=16.6 | USNO-B1 | | |
| 29.6 | 273.0943 | 14.2902 | B2=20.6, R2=19.0 | USNO-B1 | | |
| 33.6 | 273.0951 | 14.2894 | B2=19.5, I=18.2, R2=18.0 | USNO-B1 | | |
| 38.4 | 273.0977 | 14.3044 | B2=20.7, I=18.2, R1=18.5, R2=19.0 | USNO-B1 | | |
| 38.8 | 273.0874 | 14.2865 | B2=20.1, I=17.8, R1=18.2, R2=18.6 | USNO-B1 | | |
| 40.1 | 273.0800 | 14.2911 | B1=20.2, B2=21.2, I=18.3, R1=18.6, R2=18.8 | USNO-B1 | | |
| 43.4 | 273.0904 | 14.2850 | B1=19.9, B2=20.9, I=18.3, R1=18.7, R2=19.2 | USNO-B1 | | |
| 44.8 | 273.0831 | 14.2864 | B2=19.7, I=18.0, R1=18.8, R2=17.9 | USNO-B1 | | |
| 45.0 | 273.0861 | 14.3091 | B2=21.1, R1=18.9, R2=19.5 | USNO-B1 | | |
| 53.9 | 273.0922 | 14.2823 | B2=20.4, I=17.7, R1=18.0, R2=18.4 | USNO-B1 | | |
| 54.6 | 273.1037 | 14.3039 | B1=19.9, B2=20.6, R1=18.8, R2=19.4 | USNO-B1 | | |
| 58.2 | 273.1057 | 14.3016 | B1=18.0, B2=18.6, I=17.4, R1=17.3, R2=17.4 | USNO-B1 | | |
| 59.1 | 273.0744 | 14.2899 | I=17.9, R1=19.0 | USNO-B1 | | |
| 67.6 | 273.0754 | 14.3098 | R1=19.0, R2=19.7 | USNO-B1 | | |
| 68.0 | 273.0923 | 14.2784 | B1=18.1, B2=18.2, I=17.3, R1=17.3, R2=16.9 | USNO-B1 | | |
| 69.1 | 273.0761 | 14.2831 | B2=20.1, I=18.4, R1=18.4, R2=18.9 | USNO-B1 | | |
| 69.3 | 273.0913 | 14.2779 | B2=20.6, R2=19.1 | USNO-B1 | | |
| 71.2 | 273.1064 | 14.3084 | R1=18.8, R2=19.1 | USNO-B1 | | |
| 71.4 | 273.0843 | 14.3162 | B1=17.3, B2=17.2, I=16.1, R1=16.1, R2=16.0 | USNO-B1 | | |
| 72.6 | 273.1104 | 14.2990 | B1=18.8, B2=18.8, I=17.3, R1=17.5, R2=17.2 | USNO-B1 | | |
| 72.7 | 273.0959 | 14.2778 | B1=19.2, B2=19.8, I=18.5, R1=18.4, R2=18.7 | USNO-B1 | | |
| 73.8 | 273.0942 | 14.3171 | I=18.5, R1=18.5, R2=19.4 | USNO-B1 | | |
| 79.3 | 273.0913 | 14.3191 | B1=18.3, B2=18.6, I=17.4, R1=18.0, R2=17.2 | USNO-B1 | | |
| 79.5 | 273.0686 | 14.3056 | R1=18.7, R2=19.5 | USNO-B1 | | |
| 80.4 | 273.0795 | 14.3172 | B2=20.5, R2=19.2 | USNO-B1 | | |
| 80.5 | 273.0910 | 14.3194 | B2=20.1, I=18.1, R1=17.6, R2=18.7 | USNO-B1 | | |
| 80.8 | 273.0672 | 14.2914 | B1=20.0, R2=19.1 | USNO-B1 | | |
| 83.4 | 273.0834 | 14.2747 | B1=19.1, B2=19.8, I=18.3, R1=18.8, R2=19.0 | USNO-B1 | | |
| 84.7 | 273.0970 | 14.3195 | I=18.6, R2=19.5 | USNO-B1 | | |
| 85.8 | 273.0676 | 14.2866 | B2=20.4, I=18.2, R1=18.5, R2=18.6 | USNO-B1 | | |
| 86.1 | 273.1086 | 14.3124 | I=18.3, R2=19.5 | USNO-B1 | | |
| 86.9 | 273.0666 | 14.2879 | B1=18.5, B2=18.5, I=16.8, R1=17.1, R2=17.0 | USNO-B1 | | |
| 87.2 | 273.0770 | 14.2762 | B1=19.1, B2=19.7, I=17.4, R1=17.8, R2=17.6 | USNO-B1 | | |
| 87.9 | 273.0892 | 14.3215 | B1=17.0, B2=17.1, I=15.8, R1=15.9, R2=15.9 | USNO-B1 | | |
| 88.8 | 273.0983 | 14.2739 | B1=16.9, B2=17.5, I=16.2, R1=16.1, R2=16.4 | USNO-B1 | | |
| 91.1 | 273.1137 | 14.3070 | B1=19.6, B2=20.7, I=18.1, R1=18.8, R2=18.5 | USNO-B1 | | |
| 94.2 | 273.0817 | 14.2721 | B1=17.4, B2=18.2, I=16.9, R1=16.2, R2=16.7 | USNO-B1 | | |
| 95.0 | 273.0779 | 14.3209 | B1=18.3, B2=18.6, I=17.4, R1=17.2, R2=17.2 | USNO-B1 | | |
| 95.9 | 273.0818 | 14.2716 | B2=17.5, I=17.4, R1=17.6, R2=16.2 | USNO-B1 | | |
| 97.8 | 273.1160 | 14.3064 | B2=20.5, R1=18.3 | USNO-B1 | | |
| 99.0 | 273.0804 | 14.3231 | B1=19.8, B2=19.9, I=18.0, R1=18.1, R2=18.6 | USNO-B1 | | |
| 100.0 | 273.0709 | 14.3181 | B1=20.0, B2=20.5 | USNO-B1 | | |
| 101.1 | 273.0764 | 14.2721 | B1=19.1, B2=19.7, I=18.2, R1=18.1, R2=18.4 | USNO-B1 | | |
| 101.3 | 273.0939 | 14.3249 | I=18.3, R1=18.6, R2=19.5 | USNO-B1 | | |
| 101.8 | 273.0903 | 14.3254 | B2=19.7, I=18.1, R1=18.2, R2=17.7 | USNO-B1 | | |
| 102.4 | 273.1186 | 14.3018 | B2=20.2, I=18.5, R1=18.3, R2=18.5 | USNO-B1 | | |
| 105.1 | 273.1063 | 14.2727 | B1=19.5, B2=20.4, I=18.5 | USNO-B1 | | |
| 106.5 | 273.1025 | 14.2703 | B1=16.8, B2=17.9, I=16.0 | USNO-B1 | | |
| 106.8 | 273.0590 | 14.2973 | B2=20.6, I=18.5, R1=18.6, R2=19.1 | USNO-B1 | | |
| 109.4 | 273.0641 | 14.3147 | B1=19.4, B2=19.5, I=18.0, R1=17.8, R2=17.6 | USNO-B1 | | |
| 111.3 | 273.0855 | 14.2664 | B1=17.9, B2=18.7, I=17.7, R1=17.4, R2=17.2 | USNO-B1 | | |
| 111.5 | 273.0719 | 14.3228 | I=17.8, R2=19.6 | USNO-B1 | | |
| 111.6 | 273.0915 | 14.3280 | B2=20.7, R1=19.0, R2=19.4 | USNO-B1 | | |
| 112.0 | 273.1022 | 14.2685 | B1=18.4, B2=17.6, R1=18.0 | USNO-B1 | | |
| 113.1 | 273.1216 | 14.2916 | B2=20.8, R1=18.9, R2=19.6 | USNO-B1 | | |
| 113.2 | 273.0656 | 14.3182 | B2=20.2, I=15.2 | USNO-B1 | | |
| 113.3 | 273.0707 | 14.3226 | B1=17.7, B2=17.7, I=16.0, R1=15.9, R2=16.1 | USNO-B1 | | |
| 113.8 | 273.1221 | 14.3003 | B1=20.1, B2=20.5, I=18.2, R1=18.4, R2=18.9 | USNO-B1 | | |
| 113.9 | 273.0587 | 14.2870 | B1=19.5, I=17.7 | USNO-B1 | | |
| 115.7 | 273.1166 | 14.2783 | B1=19.3, B2=20.1, I=18.3, R1=18.7, R2=18.5 | USNO-B1 | | |
| 116.4 | 273.0563 | 14.2978 | B1=19.5, B2=20.4, I=18.0, R1=18.4 | USNO-B1 | | |
| 116.7 | 273.0651 | 14.3191 | B1=16.8, B2=17.2, I=15.8, R1=15.9 | USNO-B1 | | |
| 119.4 | 273.0554 | 14.2974 | B1=19.7, B2=19.9 | USNO-B1 | | |
| 120.2 | 273.1235 | 14.2911 | B2=20.8, R2=19.1 | USNO-B1 | | |
| 124.3 | 273.0690 | 14.2689 | B1=18.8, B2=20.1, I=18.3, R1=18.2, R2=18.1 | USNO-B1 | | |
| 124.3 | 273.1146 | 14.2725 | B2=20.1, I=17.4 | USNO-B1 | | |
| 124.6 | 273.0988 | 14.2636 | R1=18.8, R2=18.8 | USNO-B1 | | |
| 124.8 | 273.0929 | 14.3316 | B1=16.5, B2=16.7, I=15.2, R1=15.0, R2=15.1 | USNO-B1 | | |
| 125.5 | 273.0551 | 14.3068 | B1=20.2, B2=20.5, I=18.1, R1=18.9, R2=18.8 | USNO-B1 | | |
| 127.1 | 273.0680 | 14.3255 | B1=19.6, B2=20.0, I=18.5, R1=18.6, R2=18.4 | USNO-B1 | | |
| 128.0 | 273.1216 | 14.3146 | B1=14.6, B2=14.2, I=10.8, R1=11.9, R2=12.1 | USNO-B1 | | |
| 129.9 | 273.0656 | 14.3247 | I=18.6, R1=19.0, R2=18.9 | USNO-B1 | | |
| 130.0 | 273.1027 | 14.2633 | B2=16.9, I=15.6 | USNO-B1 | | |
| 130.8 | 273.1253 | 14.2857 | R1=18.5, R2=19.8 | USNO-B1 | | |
| 132.0 | 273.1146 | 14.2695 | I=18.2, R2=19.0 | USNO-B1 | | |
| 132.7 | 273.1224 | 14.2784 | B1=17.2, B2=18.0, I=16.7, R1=16.5, R2=16.4 | USNO-B1 | | |
| 132.9 | 273.1039 | 14.2629 | B1=14.6, R2=14.0 | USNO-B1 | | |
| 133.3 | 273.0515 | 14.2957 | B1=17.4, B2=17.4, I=15.4, R1=15.6, R2=15.8 | USNO-B1 | | |
| 135.1 | 273.1045 | 14.2624 | B1=14.8, B2=15.2, I=13.9, R1=13.4, R2=13.9 | USNO-B1 | | |
| 136.6 | 273.0794 | 14.3337 | B1=19.1, B2=19.6, I=18.3, R1=18.3, R2=18.4 | USNO-B1 | | |
| 138.4 | 273.0617 | 14.3244 | B1=18.6, B2=18.3, I=16.9, R1=16.9, R2=16.9 | USNO-B1 | | |
| 139.7 | 273.1037 | 14.1861 | NED | | ||
| 140.9 | 273.0513 | 14.3094 | I=16.9, R1=17.8 | USNO-B1 | | |
| 141.0 | 273.1166 | 14.2679 | B2=19.9, I=17.2, R1=17.4, R2=17.4 | USNO-B1 | | |
| 141.0 | 273.1043 | 14.3336 | B2=20.5, I=16.9, R1=18.1, R2=17.9 | USNO-B1 | | |
| 141.1 | 273.0776 | 14.2597 | B1=20.4, B2=20.8 | USNO-B1 | | |
| 141.9 | 273.1196 | 14.2704 | B1=17.6, B2=18.0, I=16.6, R1=16.6, R2=16.7 | USNO-B1 | | |
| 142.0 | 273.0868 | 14.2577 | I=18.5, R2=19.8 | USNO-B1 | | |
| 144.3 | 273.0842 | 14.3368 | B2=19.9, R1=18.7, R2=18.6 | USNO-B1 | | |
| 144.9 | 273.0499 | 14.3086 | B2=19.9, I=16.4, R1=17.9, R2=17.3 | USNO-B1 | | |
| 145.2 | 273.0734 | 14.3342 | B2=20.4, I=17.9, R1=18.7, R2=18.8 | USNO-B1 | | |
| 146.0 | 273.1274 | 14.3147 | B1=19.9, B2=20.9, R2=19.1 | USNO-B1 | | |
| 146.6 | 273.0726 | 14.3343 | B1=20.3, B2=19.9 | USNO-B1 | | |
| 147.0 | 273.1221 | 14.2710 | B1=17.4, B2=16.8, I=16.0, R1=15.5, R2=16.2 | USNO-B1 | | |
| 147.7 | 273.1029 | 14.2658 | NED | | ||
| 147.9 | 273.1320 | 14.2961 | B1=20.1, B2=20.9 | USNO-B1 | | |
| 148.5 | 273.1223 | 14.2706 | I=15.9, R1=16.5, R2=16.3 | USNO-B1 | | |
| 149.2 | 273.0488 | 14.2847 | B1=17.9, B2=18.0, I=16.6, R1=16.6, R2=16.9 | USNO-B1 | | |
| 150.5 | 273.0655 | 14.3317 | B1=18.6, B2=19.1, I=17.8, R1=17.8, R2=17.6 | USNO-B1 | | |
| 150.8 | 273.1329 | 14.2957 | B1=19.9, B2=20.9, R2=19.2 | USNO-B1 | | |
| 151.3 | 273.1211 | 14.3260 | B1=19.9, B2=20.9, R2=19.3 | USNO-B1 | | |
| 152.5 | 273.0970 | 14.3388 | B1=17.8, B2=17.8, I=16.6, R1=16.4, R2=16.5 | USNO-B1 | | |
| 152.9 | 273.1007 | 14.3382 | B1=19.0, B2=19.5, I=17.1, R1=17.3, R2=16.9 | USNO-B1 | | |
| 156.6 | 273.0743 | 14.3379 | B2=21.2, R1=19.1 | USNO-B1 | | |
| 157.6 | 273.0475 | 14.3129 | B1=20.0, I=18.3, R1=18.0, R2=19.7 | USNO-B1 | | |
| 158.1 | 273.0765 | 14.2551 | B2=20.6, R1=18.8, R2=19.8 | USNO-B1 | | |
| 158.2 | 273.0718 | 14.2567 | B1=18.7, B2=19.3, I=17.6, R1=17.7, R2=18.1 | USNO-B1 | | |
| 158.6 | 273.1286 | 14.3198 | B1=17.4, B2=17.4, I=16.2, R1=16.3, R2=16.1 | USNO-B1 | | |
| 159.9 | 273.0477 | 14.2793 | B1=19.8, B2=20.6, I=17.8, R1=18.2, R2=19.2 | USNO-B1 | | |
| 160.2 | 273.0729 | 14.2557 | B1=20.5, B2=20.5, R2=19.9 | USNO-B1 | | |
| 160.2 | 273.0825 | 14.3411 | B2=20.6, I=18.1, R1=18.6, R2=18.8 | USNO-B1 | | |
| 161.3 | 273.1356 | 14.3018 | I=18.7, R1=18.9, R2=19.1 | USNO-B1 | | |
| 162.6 | 273.0829 | 14.3418 | B1=19.3, B2=19.8, I=18.6, R1=18.6, R2=18.7 | USNO-B1 | | |
| 162.7 | 273.1341 | 14.3110 | I=17.9, R1=18.4, R2=18.9 | USNO-B1 | | |
| 163.2 | 273.1332 | 14.2805 | B1=19.5, B2=19.8, I=18.2, R1=18.3, R2=18.3 | USNO-B1 | | |
| 164.7 | 273.0956 | 14.2517 | B1=20.1, B2=20.6, I=18.4, R2=19.2 | USNO-B1 | | |
| 165.4 | 273.1250 | 14.2664 | B2=19.9, I=15.4 | USNO-B1 | | |
| 165.6 | 273.1247 | 14.2660 | B1=16.5, B2=16.6, I=15.5, R1=15.4, R2=15.2 | USNO-B1 | | |
| 165.7 | 273.1254 | 14.2668 | B2=19.3, I=16.5, R1=17.7, R2=16.0 | USNO-B1 | | |
| 167.1 | 273.1359 | 14.3091 | B2=19.9, I=16.0, R1=17.1, R2=17.0 | USNO-B1 | | |
| 168.4 | 273.0853 | 14.3437 | I=16.7, R1=18.4, R2=16.4 | USNO-B1 | | |
| 168.5 | 273.1070 | 14.3408 | B2=21.0, I=18.0, R1=18.6, R2=19.0 | USNO-B1 | | |
| 168.7 | 273.0810 | 14.2510 | B1=18.6, B2=19.0, I=18.2, R1=18.1, R2=18.2 | USNO-B1 | | |
| 169.0 | 273.1114 | 14.2551 | B1=18.1, B2=18.2, I=17.1, R1=16.7, R2=16.6 | USNO-B1 | | |
| 169.8 | 273.1361 | 14.2831 | R1=19.0, R2=19.6 | USNO-B1 | | |
| 170.2 | 273.0861 | 14.3442 | B1=17.3, B2=17.0, I=15.6, R1=15.7, R2=15.2 | USNO-B1 | | |
| 171.0 | 273.0852 | 14.3444 | I=17.2, R1=16.9, R2=18.0 | USNO-B1 | | |
| 173.7 | 273.0520 | 14.3287 | B1=17.0, B2=17.2, I=15.9, R1=16.1, R2=16.0 | USNO-B1 | | |
| 174.5 | 273.1055 | 14.2511 | B1=20.0, B2=20.1, R2=18.6 | USNO-B1 | | |
| 175.2 | 273.0598 | 14.3362 | B2=19.8, I=17.8, R1=17.3, R2=17.8 | USNO-B1 | | |
| 175.4 | 273.0624 | 14.3380 | B1=19.6, B2=20.1, I=18.4, R1=18.4, R2=18.7 | USNO-B1 | | |
| 177.0 | 273.1060 | 14.2505 | B2=20.0, I=18.5, R1=18.2, R2=18.8 | USNO-B1 | | |
| 177.1 | 273.1091 | 14.3425 | B2=21.1, R1=19.0 | USNO-B1 | | |
| 177.8 | 273.0921 | 14.3464 | B1=19.8, B2=18.8, I=16.5, R1=16.7, R2=16.5 | USNO-B1 | | |
| 178.6 | 273.0907 | 14.2475 | B2=21.1, R2=19.1 | USNO-B1 | | |
| 179.8 | 273.0623 | 14.2547 | B2=20.6, R2=19.9 | USNO-B1 | | |
| 180.1 | 273.0402 | 14.2828 | B2=20.3, R2=18.7 | USNO-B1 | | |
| 183.4 | 273.1217 | 14.3375 | B2=20.4, I=18.3, R1=19.0, R2=19.1 | USNO-B1 | | |
| 183.5 | 273.0652 | 14.3422 | B1=17.6, B2=17.5, I=15.7, R1=16.0, R2=15.9 | USNO-B1 | | |
| 184.5 | 273.1425 | 14.2943 | B2=16.8, I=14.6 | USNO-B1 | | |
| 185.3 | 273.0392 | 14.2812 | R1=19.0, R2=19.6 | USNO-B1 | | |
| 185.5 | 273.1418 | 14.2871 | B1=17.4, B2=17.8, I=16.6, R1=16.5, R2=16.5 | USNO-B1 | | |
| 187.2 | 273.1184 | 14.3410 | B2=21.1, R2=19.3 | USNO-B1 | | |
| 187.5 | 273.1391 | 14.2766 | B1=19.6, B2=20.2, I=18.3, R1=18.6, R2=19.3 | USNO-B1 | | |
| 188.0 | 273.0520 | 14.3344 | B1=16.9, B2=16.8, I=15.0, R1=15.2, R2=15.1 | USNO-B1 | | |
| 188.8 | 273.1336 | 14.3277 | B2=20.8, R1=18.8, R2=19.3 | USNO-B1 | | |
| 189.0 | 273.1090 | 14.2481 | B1=17.8, B2=17.9, I=15.8, R1=15.9, R2=16.0 | USNO-B1 | | |
| 189.2 | 273.0937 | 14.3495 | B1=19.8, B2=20.4, I=18.3, R2=19.1 | USNO-B1 | | |
| 189.2 | 273.0375 | 14.2828 | B1=18.0, B2=18.5, I=17.3, R1=17.1, R2=17.1 | USNO-B1 | | |
| 189.2 | 273.0420 | 14.2721 | B1=16.1, B2=16.4, I=15.2, R1=14.8, R2=15.2 | USNO-B1 | | |
| 189.7 | 273.0369 | 14.2844 | B2=19.9, I=17.9, R2=18.5 | USNO-B1 | | |
| 192.1 | 273.1109 | 14.3463 | B1=15.2, B2=15.5, I=14.2, R1=13.9, R2=14.2 | USNO-B1 | | |
| 192.8 | 273.0347 | 14.2912 | I=18.4, R2=19.5 | USNO-B1 | | |
| 195.3 | 273.1086 | 14.3482 | B2=20.5, I=18.3, R2=19.0 | USNO-B1 | | |
| 195.3 | 273.1366 | 14.3267 | B2=20.7, R1=18.7, R2=19.0 | USNO-B1 | | |
| 195.4 | 273.0679 | 14.3471 | B1=19.6, B2=20.6, R1=17.3 | USNO-B1 | | |
| 195.6 | 273.1086 | 14.2459 | B2=21.2, R1=18.9, R2=19.1 | USNO-B1 | | |
| 196.7 | 273.1429 | 14.2793 | B1=17.1, B2=17.4, I=16.0, R1=15.7, R2=15.9 | USNO-B1 | | |
| 196.9 | 273.0354 | 14.2819 | I=17.9, R2=19.4 | USNO-B1 | | |
| 197.8 | 273.0344 | 14.2846 | B2=19.9, R2=19.1 | USNO-B1 | | |
| 198.6 | 273.0605 | 14.3445 | B1=17.4, B2=17.5, I=16.5, R1=17.1 | USNO-B1 | | |
| 198.8 | 273.1246 | 14.3407 | B1=19.6, B2=20.2, I=18.2, R1=18.5, R2=19.0 | USNO-B1 | | |
| 199.5 | 273.1025 | 14.2431 | B2=20.4, R2=19.1 | USNO-B1 | | |
| 199.7 | 273.1457 | 14.3086 | B1=19.4, B2=19.3, I=18.1, R1=18.0, R2=18.1 | USNO-B1 | |
Queried APM-N, SDSS, PSCz, SSS, NED, 2MASSX, USNO-B1.
* RA/Dec in equinox J2000
Magnitudes depend on the catalogue. e.g. For Sloan, R is the Sloan r mag, not the Johnson R from APM, for example