December January paper

This page is devoted to the first paper on OP313 following the LST detection and the ATel

The aim is to focus on the December 2023 and January 2024 data set and publish this data set in a quick paper

Fermi analysis

The Fermi LAT analysis has been performed on a large time scale to derive a long-term light curve and run a Bayesian block analysis to defined bocks of observation

Parameters

RA = 197.6324 degrees

Dec = 32.3547 degrees

Start = 715617241.0 MET (s)

Stop = 727281241.0 MET (s)

ROI = 10.0 degrees

E min = 100.0 MeV

E max = 300000.0 MeV

E min ext = 50.11872336272722 MeV

E max ext = 598578.6944906638 MeV

IRFs = P8R3_SOURCE_V3

evclass = 128

evtype = 3

Long term Fermi-LAT Light curve

For more information, see https://www.lst1.iac.es/wiki/index.php/Fermi_LAT_Main_OP313

This plot is the Fermi-LAT LC with the final bayesian block description.

The SEDs corresponding to each block is given here :

Focus on the December / January data

The Fermi analysis has been run on the LST GTI and lead to a detection at TS=485.58. Power-law and logparabola model were tested and the later is prefered at a TS 0f 8.

LST analysis

Data-taking information

• observation summary

Date	Runs	time (h)	Zd	Az	Transmission	Comments
2023-12-09	15942, 15943, 15944, 15945	1.31	35-53	-	-	50-sec shifted timestamp -> solved!
2023-12-10	15975, 15976, 15977, 15978	1.61	30-51	-	-
2023-12-11	16007, 16008, 16009, 16010	1.39	30-54	-	-
2023-12-12	16042, 16043, 16044, 16045	1.63	30-54	-	-
2023-12-13	16079, 16080, 16081, 16082, 16083	1.69	30-53	-	-
2023-12-14	16114, 16116, 16117, 16118, 16119	1.60	30-52	-	-
2023-12-15	16150, 16151, 16152, 16153, 16154, 16155, 16156	1.75	30-52	-	-
2023-12-16	16188, 16189, 16191, 16192, 16193	1.67	25-52	-	-	Drive issue during run 16190 (no tracking)
2023-12-17	16220, 16221, 16222, 16223, 16224, 16225	1.72	25-50	-	-
2023-12-18	16240, 16241, 16242, 16243, 16244, 16246		25-50	-	-	online gain-selected data
2023-12-19	16258, 16259, 16260, 16261, 16262, 16263		25-50	-	-	online gain-selected data. Removed ?
2023-12-20	16269, 16270		40-43	-	-	online gain-selected data, humidity is rising during run 16270 Removed ?
2024-01-09	16293, 16294, 16295	0.63	20-26	-	-
2024-01-13	16350, 16351, 16352, 16353, 16354, 16356, 16357, 16358, 16359	2.08	15-43	-	-
2024-01-17	16391, 16392	0.46	25-30	-	-	Timestamp is shifted?? -> solved!
2024-01-18	16407	0.10	4-6	-	-	Removed ?
2024-01-19	16412, 16413, 16414, 16415	1.34	5-30	-	-
2024-01-21	16418, 16419, 16420	0.70	4-8	-	-