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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

3031 results found.

  1. GRB 190708B: MAXI/GSC detection
  2. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  3. GRB 190706A: MAXI/GSC detection
  4. LIGO/Virgo S190630ag: no counterpart candidate in the SVOM/GWAC observations
  5. GRB 190701A: COATLI Optical Observations
  6. GRB 190701A: Swift detection of a burst
  7. GRB 190630B: Swift-XRT refined Analysis
  8. Fermi trigger No 583567803 Global MASTER-Net observations report
  9. Fermi trigger No 583327924 Global MASTER-Net observations report
  10. GRB 190626B: Fermi GBM Final Real-time Localization
  11. Fermi trigger No 583111521 Global MASTER-Net observations report
  12. Fermi trigger No 582886211 Global MASTER-Net observations report
  13. Fermi trigger No 582856902 Global MASTER-Net observations report
  14. Fermi trigger No 582615488 Global MASTER-Net observations report
  15. GRB 190613B: AstroSat CZTI detection
  16. GRB 190611B: AstroSat CZTI detection
  17. Konus-Wind observation of GRB 190613B
  18. Fermi trigger No 582159815 Global MASTER-Net observations report
  19. GRB 190611B: CALET Gamma-Ray Burst Monitor detection
  20. GRB 190613B: Insight-HXMT/HE detection
  21. Konus-Wind observation of short/hard GRB 190610A
  22. Konus-Wind observation of GRB 190611B
  23. Fermi trigger No 582115625 Global MASTER-Net observations report
  24. GRB 190613B: Fermi GBM observation
  25. GRB 190611B: BALROG localization (Fermi Trigger 581986074 / GRB 190611950)
  26. IPN Triangulation of GRB 190611B
  27. GRB 190613B: BALROG localization (Fermi Trigger 582115625 / GRB 190613449)
  28. GRB 190613B: Swift detection of a burst with an optical counterpart
  29. GRB 190613B: Fermi GBM Final Real-time Localization
  30. GRB 190613A: Fermi GBM Final Real-time Localization
  31. GRB 190611B: Fermi GBM detection
  32. Fermi trigger No 581889628 Global MASTER-Net observations report
  33. Fermi trigger No 581882394 Global MASTER-Net observations report
  34. GRB 190609A: Fermi GBM Final Real-time Localization
  35. Fermi trigger No 581719018 Global MASTER-Net observations report
  36. Fermi trigger No 581645543 Global MASTER-Net observations report
  37. Fermi trigger No 581469752 Global MASTER-Net observations report
  38. GRB 190605A: Fermi GBM Final Real-time Localization
  39. Fermi trigger No 581281470 Global MASTER-Net observations report
  40. Konus-Wind observation of extremely bright GRB 190530A
  41. GRB 190525A: AstroSat CZTI detection
  42. LIGO/Virgo S190521r: CNEOST follow-up observations
  43. Fermi GRB190525.03 Global MASTER-Net observations report
  44. GRB 190525A: Fermi GBM Final Real-time Localization
  45. LIGO/Virgo S190521g: No optical counterpart from SVOM/GWAC observations.
  46. IGO/Virgo S190521g: Coverage and upper limits from MAXI/GSC observations
  47. LIGO/Virgo S190512at: SVOM/GWAC-F60A observations
  48. LIGO/Virgo S190519bj: MAXI/GSC Observations
  49. LIGO/Virgo S190519bj Global MASTER-Net observations report
  50. Fermi GRB190517.81 Global MASTER-Net observations report
  51. LIGO/Virgo S190513bm : TAROT-Calern and TAROT-Chile (TCA/TCH)/GRANDMA observation report.
  52. Fermi GRB190514.67 Global MASTER-Net observations report
  53. LIGO/Virgo S190513bm: Lick/KAIT Follow-Up Observations
  54. LIGO/Virgo S190510g: Further KMTNet observation of DECam-GROWTH and DESGW candidates
  55. LIGO/Virgo S190513bm Global MASTER-Net observations report
  56. LIGO/Virgo S190510g: Pan-STARRS and ATLAS observations and candidates
  57. LIGO/Virgo S190512at Global MASTER-Net observations report
  58. LIGO/Virgo S190510g: DOAO Observation
  59. LIGO/Virgo S190510g: KMTNet observation of DECam-GROWTH and DESGW candidates
  60. LIGO/Virgo S190510g: Las Cumbres Observatory Galaxy Targeted Counterpart Search
  61. LIGO/Virgo S190510g: Dabancheng/HMT Follow-Up Observations
  62. LIGO/Virgo S190510g: Xinglong/Schmidt Follow-Up Observations
  63. LIGO/Virgo S190510g: SOAR/Goodman follow-up observations
  64. LIGO/Virgo S190510g: CNEOST Follow-Up Observations
  65. LIGO/Virgo S190510g: Lick/KAIT Follow-Up Observations
  66. LIGO/Virgo S190510g: Lulin Optical Follow-up Observations
  67. LIGO/Virgo S190425z: CAHA-GRANDMA Observation of the Swift UVOT Source
  68. Konus-Wind observation of GRB 190501A
  69. LIGO/Virgo S190510g: HSC Y-band follow-up observation
  70. Fermi GRB190510.12 Global MASTER-Net observations report
  71. LIGO/Virgo S190510g Global MASTER-Net observations report
  72. Fermi GRB190507.97 Global MASTER-Net observations report
  73. Fermi GRB190507.27 Global MASTER-Net observations report
  74. IceCube-190504A: MASTER optical monitoring analysis
  75. Fermi GRB190505.05 Global MASTER-Net observations report
  76. Fermi GRB190504.68 Global MASTER-Net observations report
  77. LIGO/Virgo S190503bf Global MASTER-Net observations report
  78. IceCube-190503A: Lick/KAIT Follow-Up Observations
  79. Fermi GRB190429.74 Global MASTER-Net observations report
  80. LIGO/Virgo S190426c: YAHPT Optical Observation
  81. LIGO/Virgo S190426c: MASTER analysys of GRAWITA transients
  82. LIGO/Virgo S190426c: OAJ-GRANDMA observation report
  83. LIGO/Virgo S190426c: DDOTI/OAN Optical Observations
  84. LIGO/Virgo S190426c: COATLI Optical Observations of Galaxies
  85. LIGO/Virgo S190426c: MMT Follow-Up Observations
  86. LIGO/Virgo S190426c: Lick/KAIT Follow-Up Observations
  87. LIGO/Virgo S190426c: CNEOST Optical Observations
  88. LIGO/Virgo S190425z: CNEOST Optical Observations
  89. LIGO/Virgo S190426c: Optical Wide-field Search with the Zwicky Transient Facility
  90. LIGO/Virgo S190425z: BOOTES-5/JGT observations of galaxies
  91. LIGO/Virgo S190425z: GRANDMA follow-up observations with Les Makes-T60, AZT-8 and Abastumani-T70
  92. LIGO/Virgo S190426c: SAO optical observation
  93. LIGO/Virgo S190425z: Further MMT Follow-Up Observations
  94. LIGO/Virgo S190425z: COATLI Observations of Galaxies
  95. LIGO/Virgo S190426c Global MASTER-Net observations report
  96. LIGO/Virgo S190425z: YAHPT Optical Observation
  97. LIGO/Virgo S190425z: Las Cumbres Observatory Galaxy Targeted Counterpart Search
  98. LIGO/Virgo S190425z: KMTNet Observation
  99. LIGO/Virgo S190425z: GRAWITA TNG observations of ZTF19aarzaod
  100. LIGO/Virgo S190425z: Las Cumbres Observatory Galaxy Targeted Counterpart Search

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