Data analysis method for the search of point sources of gamma rays with the HAGAR telescope array

R. J. Britto; B. S. Acharya; G. C. Anupama; P. Bhattacharjee; V. R. Chitnis; R. Cowsik; N. Dorji; S. K. Duhan; K. S. Gothe; P. U. Kamath; P. K. Mahesh; J. Manoharan; B. K. Nagesh; N. K. Parmar; T. P. Prabhu; S. K. Rao; L. Saha; F. Saleem; A. K. Saxena; S. K. Sharma; A. Shukla; B. B. Singh; R. Srinivasan; G. Srinivasulu; P. V. Sudersanan; D. Tsewang; S. S. Upadhya; P. R. Vishwanath

doi:10.7529/ICRC2011/V09/0943

Data analysis method for the search of point sources of gamma rays with the HAGAR telescope array

R. J. Britto
, B. S. Acharya
, G. C. Anupama
, P. Bhattacharjee
, V. R. Chitnis
, R. Cowsik
, N. Dorji
, S. K. Duhan
, K. S. Gothe
, P. U. Kamath
, P. K. Mahesh
, J. Manoharan
, B. K. Nagesh
, N. K. Parmar
, T. P. Prabhu
, S. K. Rao
, L. Saha
, F. Saleem
, A. K. Saxena
, S. K. Sharma

A. Shukla, B. B. Singh, R. Srinivasan, G. Srinivasulu, P. V. Sudersanan, D. Tsewang, S. S. Upadhya, P. R. Vishwanath

Department of Physics

Research output: Contribution to conference › Paper › peer-review

Abstract

The High Altitude GAmma-Ray (HAGAR) experiment is the highest altitude atmospheric Cherenkov sampling array, set up at 4300 m amsl in the Himalayas (Northern India). It constitutes 7 telescopes, each one with seven 90 cm-diameter mirrors, a field of view of 3 degrees, and was designed to reach a relatively low threshold (currently around 200 GeV) with quite a low total mirror area (31 m²). In order to remove the strong isotropic background of charged cosmic rays, data are collected by tracking separately On-source followed by Off-source regions, or vice-versa. Typical observation period is about 30-40 min. On-Off data pairs are then selected according to quality parameters such as stability of the trigger rate and the comparison of average trigger rates between On and Off-source data sets. Signal extraction from point sources is done by performing analysis cuts on the count rate excess, rejecting off-axis events. Validation of method and systematics are evaluated through the analysis of fake sources (Off-Off pairs) located at similar declination as the observed point sources. Spurious signal, if any, would show up in this study.

Original language	English
Pages	142-145
Number of pages	4
DOIs	https://doi.org/10.7529/ICRC2011/V09/0943
State	Published - 2011
Event	32nd International Cosmic Ray Conference, ICRC 2011 - Beijing, China Duration: Aug 11 2011 → Aug 18 2011

Conference

Conference	32nd International Cosmic Ray Conference, ICRC 2011
Country/Territory	China
City	Beijing
Period	08/11/11 → 08/18/11

Keywords

Crab nebula
Data analysis
Ground-based gamma-ray astronomy: Atmospheric Cherenkov Technique

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10.7529/ICRC2011/V09/0943

Cite this

Britto, R. J., Acharya, B. S., Anupama, G. C., Bhattacharjee, P., Chitnis, V. R., Cowsik, R., Dorji, N., Duhan, S. K., Gothe, K. S., Kamath, P. U., Mahesh, P. K., Manoharan, J., Nagesh, B. K., Parmar, N. K., Prabhu, T. P., Rao, S. K., Saha, L., Saleem, F., Saxena, A. K., ... Vishwanath, P. R. (2011). Data analysis method for the search of point sources of gamma rays with the HAGAR telescope array. 142-145. Paper presented at 32nd International Cosmic Ray Conference, ICRC 2011, Beijing, China. https://doi.org/10.7529/ICRC2011/V09/0943

@conference{097e2895cfbc4b12b919e860635e91f4,

title = "Data analysis method for the search of point sources of gamma rays with the HAGAR telescope array",

abstract = "The High Altitude GAmma-Ray (HAGAR) experiment is the highest altitude atmospheric Cherenkov sampling array, set up at 4300 m amsl in the Himalayas (Northern India). It constitutes 7 telescopes, each one with seven 90 cm-diameter mirrors, a field of view of 3 degrees, and was designed to reach a relatively low threshold (currently around 200 GeV) with quite a low total mirror area (31 m2). In order to remove the strong isotropic background of charged cosmic rays, data are collected by tracking separately On-source followed by Off-source regions, or vice-versa. Typical observation period is about 30-40 min. On-Off data pairs are then selected according to quality parameters such as stability of the trigger rate and the comparison of average trigger rates between On and Off-source data sets. Signal extraction from point sources is done by performing analysis cuts on the count rate excess, rejecting off-axis events. Validation of method and systematics are evaluated through the analysis of fake sources (Off-Off pairs) located at similar declination as the observed point sources. Spurious signal, if any, would show up in this study.",

keywords = "Crab nebula, Data analysis, Ground-based gamma-ray astronomy: Atmospheric Cherenkov Technique",

author = "Britto, \{R. J.\} and Acharya, \{B. S.\} and Anupama, \{G. C.\} and P. Bhattacharjee and Chitnis, \{V. R.\} and R. Cowsik and N. Dorji and Duhan, \{S. K.\} and Gothe, \{K. S.\} and Kamath, \{P. U.\} and Mahesh, \{P. K.\} and J. Manoharan and Nagesh, \{B. K.\} and Parmar, \{N. K.\} and Prabhu, \{T. P.\} and Rao, \{S. K.\} and L. Saha and F. Saleem and Saxena, \{A. K.\} and Sharma, \{S. K.\} and A. Shukla and Singh, \{B. B.\} and R. Srinivasan and G. Srinivasulu and Sudersanan, \{P. V.\} and D. Tsewang and Upadhya, \{S. S.\} and Vishwanath, \{P. R.\}",

year = "2011",

doi = "10.7529/ICRC2011/V09/0943",

language = "English",

pages = "142--145",

note = "32nd International Cosmic Ray Conference, ICRC 2011 ; Conference date: 11-08-2011 Through 18-08-2011",

}

Britto, RJ, Acharya, BS, Anupama, GC, Bhattacharjee, P, Chitnis, VR, Cowsik, R, Dorji, N, Duhan, SK, Gothe, KS, Kamath, PU, Mahesh, PK, Manoharan, J, Nagesh, BK, Parmar, NK, Prabhu, TP, Rao, SK, Saha, L, Saleem, F, Saxena, AK, Sharma, SK, Shukla, A, Singh, BB, Srinivasan, R, Srinivasulu, G, Sudersanan, PV, Tsewang, D, Upadhya, SS & Vishwanath, PR 2011, 'Data analysis method for the search of point sources of gamma rays with the HAGAR telescope array', Paper presented at 32nd International Cosmic Ray Conference, ICRC 2011, Beijing, China, 08/11/11 - 08/18/11 pp. 142-145. https://doi.org/10.7529/ICRC2011/V09/0943

TY - CONF

T1 - Data analysis method for the search of point sources of gamma rays with the HAGAR telescope array

AU - Britto, R. J.

AU - Acharya, B. S.

AU - Anupama, G. C.

AU - Bhattacharjee, P.

AU - Chitnis, V. R.

AU - Cowsik, R.

AU - Dorji, N.

AU - Duhan, S. K.

AU - Gothe, K. S.

AU - Kamath, P. U.

AU - Mahesh, P. K.

AU - Manoharan, J.

AU - Nagesh, B. K.

AU - Parmar, N. K.

AU - Prabhu, T. P.

AU - Rao, S. K.

AU - Saha, L.

AU - Saleem, F.

AU - Saxena, A. K.

AU - Sharma, S. K.

AU - Shukla, A.

AU - Singh, B. B.

AU - Srinivasan, R.

AU - Srinivasulu, G.

AU - Sudersanan, P. V.

AU - Tsewang, D.

AU - Upadhya, S. S.

AU - Vishwanath, P. R.

PY - 2011

Y1 - 2011

N2 - The High Altitude GAmma-Ray (HAGAR) experiment is the highest altitude atmospheric Cherenkov sampling array, set up at 4300 m amsl in the Himalayas (Northern India). It constitutes 7 telescopes, each one with seven 90 cm-diameter mirrors, a field of view of 3 degrees, and was designed to reach a relatively low threshold (currently around 200 GeV) with quite a low total mirror area (31 m2). In order to remove the strong isotropic background of charged cosmic rays, data are collected by tracking separately On-source followed by Off-source regions, or vice-versa. Typical observation period is about 30-40 min. On-Off data pairs are then selected according to quality parameters such as stability of the trigger rate and the comparison of average trigger rates between On and Off-source data sets. Signal extraction from point sources is done by performing analysis cuts on the count rate excess, rejecting off-axis events. Validation of method and systematics are evaluated through the analysis of fake sources (Off-Off pairs) located at similar declination as the observed point sources. Spurious signal, if any, would show up in this study.

AB - The High Altitude GAmma-Ray (HAGAR) experiment is the highest altitude atmospheric Cherenkov sampling array, set up at 4300 m amsl in the Himalayas (Northern India). It constitutes 7 telescopes, each one with seven 90 cm-diameter mirrors, a field of view of 3 degrees, and was designed to reach a relatively low threshold (currently around 200 GeV) with quite a low total mirror area (31 m2). In order to remove the strong isotropic background of charged cosmic rays, data are collected by tracking separately On-source followed by Off-source regions, or vice-versa. Typical observation period is about 30-40 min. On-Off data pairs are then selected according to quality parameters such as stability of the trigger rate and the comparison of average trigger rates between On and Off-source data sets. Signal extraction from point sources is done by performing analysis cuts on the count rate excess, rejecting off-axis events. Validation of method and systematics are evaluated through the analysis of fake sources (Off-Off pairs) located at similar declination as the observed point sources. Spurious signal, if any, would show up in this study.

KW - Crab nebula

KW - Data analysis

KW - Ground-based gamma-ray astronomy: Atmospheric Cherenkov Technique

UR - https://www.scopus.com/pages/publications/84899544516

U2 - 10.7529/ICRC2011/V09/0943

DO - 10.7529/ICRC2011/V09/0943

M3 - Paper

AN - SCOPUS:84899544516

SP - 142

EP - 145

T2 - 32nd International Cosmic Ray Conference, ICRC 2011

Y2 - 11 August 2011 through 18 August 2011

ER -

Data analysis method for the search of point sources of gamma rays with the HAGAR telescope array

Abstract

Conference

Keywords

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