NGC 1275

General information

• Name of the source: NGC 1275
• Brief description of the source:

- Object type : FR-I Radio Galaxy + Spiral galaxy (in interaction)

- RA: 3 19 48.16 (hh mm ss), Dec: +41 30 42.1088 (dd mm ss)

NGC 1275 data analysis

Related analysis pages

Analysis_NGC1275_Dec_2022_w_IRF_interpolation_Priyadarshi (Dec 2022, source-independent, IRF interpolation, energy-dependent cuts. Dec 20 flare for ATel https://www.astronomerstelegram.org/?read=15819 )

Analysis_NGC1275_Dec_2022_source_dep_Nozaki (Dec 20 Flare, source-dependent, IRF interpolation, energy-dependent cuts for ATel https://www.astronomerstelegram.org/?read=15819 )

Cycle I (including major flare Dec 2022)

Mireia

• Producer: Mireia Nievas Rosillo <mnievas@iac.es>

old datacheck notebook

(below some key points from Abelardo's old datacheck selection notebook, only showing those relevant for data selection)

• ZD and AZ distributions

• NSB vs moon altitude and vs run number

• Rate of cosmics

• Rate of pulses above a given pulse size

• NSB after all cuts

new data_select notebook

Data selection

(old selection using Abelardo's old datacheck notebook)

• 204 wobble runs for the selected source (out of 246)
• Observation time: 53.56 hours (out of 65.53 hours)
• (most data in Perseus-MA mode, shared with IC310, some runs in NGC1275 pointing mode)
• (moon data is removed)

1 : 2022-12-20 : [11522, 11528, 11529, 11530, 11531, 11532, 11522, 11528, 11529, 11530, 11531, 11532]
2 : 2022-12-21 : [11546, 11547, 11548, 11549, 11550]
3 : 2022-12-22 : [11566, 11568, 11569, 11570, 11571, 11572, 11573, 11574, 11566, 11568, 11569, 11570, 11571, 11572, 11573, 11574]
4 : 2022-12-23 : [11595, 11596, 11597, 11598, 11599, 11600]
5 : 2023-01-13 : [11618, 11619]
6 : 2023-01-14 : [11641, 11642, 11643, 11644, 11641, 11642, 11643, 11644]
7 : 2023-01-15 : [11660, 11661, 11662, 11663, 11660, 11661, 11662, 11663]
8 : 2023-08-15 : [13935, 13936, 13937, 13938, 13939, 13940, 13941, 13942, 13943, 13944]
9 : 2023-08-17 : [13987, 13988, 13989, 13990, 13991, 13992, 13993, 13994, 13995, 13996]
10 : 2023-08-18 : [14020, 14021, 14022, 14023]
11 : 2023-08-20 : [14069, 14070, 14071, 14072, 14073]
12 : 2023-08-21 : [14093, 14094, 14095, 14096, 14097, 14098, 14099, 14100]
13 : 2023-09-11 : [14258]
14 : 2023-09-16 : [14456]
15 : 2023-09-18 : [14495]
16 : 2023-09-19 : [14590]
17 : 2023-09-20 : [14623, 14624, 14625, 14626]
18 : 2023-09-21 : [14668, 14669]
19 : 2023-09-22 : [14700, 14701, 14702, 14703, 14704]
20 : 2023-09-23 : [14712, 14713, 14715, 14718, 14719, 14720, 14721]
21 : 2023-09-24 : [14731, 14732, 14733, 14736, 14737, 14738]
22 : 2023-10-09 : [15010, 15011, 15012, 15013, 15014, 15015, 15016, 15017]
23 : 2023-10-10 : [15039, 15040]
24 : 2023-10-11 : [15070, 15071, 15072, 15073, 15074]
25 : 2023-10-12 : [15117, 15118, 15119, 15120]
26 : 2023-11-08 : [15321, 15322, 15323, 15324, 15325, 15326, 15327]
27 : 2023-11-10 : [15401, 15402, 15403, 15404, 15405, 15406, 15407]
28 : 2023-11-11 : [15436, 15437, 15438]
29 : 2023-11-12 : [15470, 15471, 15472, 15473]
30 : 2023-11-16 : [15627, 15628, 15629, 15630, 15631]
31 : 2023-11-17 : [15660, 15661, 15662, 15663, 15664]
32 : 2023-11-19 : [15739, 15740, 15741]
33 : 2023-12-01 : [15786, 15787, 15788]
34 : 2023-12-08 : [15889, 15890, 15891, 15892, 15893]
35 : 2024-01-29 : [16423, 16424, 16425, 16426]
36 : 2024-01-30 : [16438, 16439, 16440, 16441, 16442]
37 : 2024-02-02 : [16492, 16493, 16494, 16495, 16496, 16497, 16498, 16499, 16500, 16501, 16502, 16503]
 

(new selection using news data_select notebook, 07.02.2024)

Total number of runs: 142 (in 34 nights) out of 246 Total observation time: 38.47 hours out of 65.53 h

20221220 [11522 11528 11529 11530 11531 11532]
20221221 [11546 11547 11548 11549 11550]
20221222 [11566 11568 11569 11570 11571 11572 11573 11574]
20221223 [11595 11596 11597 11598 11599 11600]
20230113 [11618 11619]
20230114 [11641 11642 11643 11644]
20230115 [11660 11661 11662 11663]
20230817 [13987 13988 13989 13990 13991 13992 13993 13994 13995 13996]
20230911 [14258]
20230916 [14456]
20230918 [14495]
20230919 [14590]
20230920 [14623 14624 14625]
20230921 [14668]
20230922 [14700 14701 14702 14703 14704]
20230923 [14712 14713 14715 14718 14719 14720 14721]
20230924 [14730 14731 14732 14733 14736 14737 14738]
20231006 [14930 14931]
20231007 [14954 14955 14956 14957 14958]
20231010 [15040]
20231012 [15117 15118 15119]
20231108 [15321 15322 15323 15324 15325 15326 15327]
20231110 [15401 15402 15403 15404 15405 15406 15407]
20231111 [15436 15437 15438]
20231112 [15470 15471 15472 15473]
20231113 [15517]
20231116 [15627 15628 15629 15630 15631]
20231117 [15660 15661 15662 15663 15664]
20231119 [15739 15740]
20231201 [15786 15787 15788]
20231208 [15889 15890 15891 15892 15893]
20240129 [16423 16424 16425 16426]
20240130 [16438 16439 16440 16441 16442]
20240202 [16492 16493 16495 16496 16497 16498 16500 16503]

 

Analysis details

Software and analysis notebook:

• Files (inc. provence): /fefs/aswg/workspace/mireia.nievas/NGC1275
• Pipeline: /fefs/aswg/workspace/mireia.nievas/NGC1275/NGC1275_to_DL3.ipynb
• lstchain: v0.10.5 originally, v0.10.7 now.
• gammapy: 1.1
• ctapipe: 0.19.2
• astropy: 5.3.4

Source:

• Coordinates: RA=49.95066663, DEC=41.5116969 (solved with astropy's SkyCoord / CDS name resolver)
• Closest (chosen) dec track: 48.22 deg.
• Cleaning: default, tail-cuts 8-4.
• Analysis type: source-independent
• IRFs: point-like, energy-dependent gammaness/theta2 cuts

Starting points:

• MC: DL2
• Models
• Data: DL1b (merged files with no images)

Results

Analysis details

• Total significance (per energy bin)

• December flare

• January flare

(note that the highest flux night was with Moon, so not included for now)

720px

• Post-flare

720px

• Per bayesian block bin (from LC analysis, see below)

Theta2 plots for different bayesian blocks

BB0	BB1
BB2	BB3
BB4	BB5
BB6

TS SkyMap

• Average (all selected runs)

• Dec flare

• Jan flare

• Night of 2023-12-08 to 2023-12-09 (~ 1.72h)

Both NGC1275 and IC310 detectable at the same time (!!). This mini-flare from IC310 will be covered in a dedicated wiki.

Light Curve

SED

• Average

• Flux-Binned SED

(from the 2nd plot, I show also the previous state for comparison)

• December

720px

• January

720px

Bayesian blocks from the flux in the run-wise Light Curve to define flux bins, then computing one SED per block.

• Fermi+LST