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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

5163 results found.

  1. GRB 240214A/1H 0451-560: MAXI/GSC detection
  2. Fermi trigger No 729152364: Global MASTER-Net observations report
  3. Fermi trigger No 729012023: Global MASTER-Net observations report
  4. Fermi trigger No 728796365: Global MASTER-Net observations report
  5. Konus-Wind detection of GRB 240123C
  6. IPN triangulation of GRB 240125B (short)
  7. GRB 240122A: ATCA detection of radio counterpart
  8. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  9. GRB 240124B: AstroSat CZTI detection
  10. IPN triangulation of GRB 240123C (short)
  11. IceCube Alert 240123.48: Global MASTER-Net observations report
  12. GRB 240123A: SAO RAS optical observations
  13. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  14. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  15. GRB 240123A: Swift-XRT refined Analysis
  16. GRB 240122A: Swift-XRT afterglow detection
  17. Fermi GRB 240115A: Global MASTER-Net observations report
  18. GRB 240112C: Swift/UVOT Detection
  19. GRB 240112C: Swift-XRT refined Analysis
  20. GRB 240112D: Fermi GBM Final Real-time Localization
  21. Fermi trigger No 726774492: Global MASTER-Net observations report
  22. GRB 240112C: Swift detection of a burst with an optical counterpart
  23. GRB 230818A: further radio observations with the VLA
  24. GRB 230812B: further radio observations with the VLA
  25. GRB 240107A: MAXI/GSC detection
  26. IPN triangulation of GRB 240101C (short)
  27. IceCube Alert 240105.52: Global MASTER-Net observations report
  28. GRB 240102A: Swift-XRT refined Analysis
  29. Fermi trigger No 725857207: Global MASTER-Net observations report
  30. GRB 240101A: Terskol Zeiss-2000 optical observations
  31. GRB 240101C: GRBAlpha detection
  32. GRB 240101A: Swift-XRT refined Analysis
  33. GRB 231230A: Swift-XRT refined Analysis
  34. Fermi trigger No 725592555: Global MASTER-Net observations report
  35. Fermi trigger No 725143760: Global MASTER-Net observations report
  36. GRB 231224A: Fermi GBM Final Real-time Localization
  37. LIGO/Virgo/KAGRA S231224e: Identification of a GW compact binary merger candidate
  38. LIGO/Virgo/KAGRA S231223j: Identification of a GW compact binary merger candidate
  39. Fermi trigger No 724781422: Global MASTER-Net observations report
  40. GRB 231210B: new optical transient detected with the Greenhill Observatory University of Tasmania within the BAT-Swift enhanced position
  41. GRB 231214B: Fermi GBM observation
  42. GRB 231216A: optical upper limits from the INAF Asiago Observatory
  43. GRB 231216A: Swift-XRT refined analysis correction
  44. GRB 231216A: R-band observations from T120 at Observatoire de Haute-Provence
  45. Swift GRB231216.77: Global MASTER-Net observations report
  46. GRB 231215A: Swift-XRT refined Analysis
  47. GRB 231214A: Fermi GBM observation
  48. GRB 231215A : MITSuME Akeno optical afterglow candidate detection
  49. GRB 231214A: Swift-XRT refined Analysis
  50. GRB 231214A: AstroSat CZTI detection
  51. GRB 231214A: Fermi-LAT detection
  52. GRB 231214A: Swift detection of a burst
  53. GRB 231214A: Fermi GBM Final Real-time Localization
  54. IceCube Alert 231211.03: Global MASTER-Net observations report
  55. GRB 231210B: Swift-XRT refined Analysis
  56. Swift GRB231210.90: Global MASTER-Net observations report
  57. Fermi trigger No 723581802: Global MASTER-Net observations report
  58. GRB 231205B: Swift-XRT refined Analysis
  59. GRB 231205B : MITSuME Akeno optical upper limits
  60. Fermi trigger No 723435916: Global MASTER-Net observations report
  61. Fermi trigger No 723326169: Global MASTER-Net observations report
  62. GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
  63. GRB 231128A: VZLUSAT-2 detection
  64. GRB 231129A : MITSuME Akeno optical upper limits
  65. GRB 231129C: MAXI/GSC detection
  66. GRB 231129A: Swift-XRT refined Analysis
  67. Fermi trigger No 722977823: Global MASTER-Net observations report
  68. IceCube-231125A: Upper limits from a search for additional neutrino events in IceCube
  69. GRB 231124A: GRBAlpha detection
  70. Fermi trigger No 722653947: Global MASTER-Net observations report
  71. Fermi trigger No 722507896: Global MASTER-Net observations report
  72. GRB 231124A: Glowbug gamma-ray detection
  73. Fermi trigger No 722462310: Global MASTER-Net observations report
  74. GRB 231124A: CALET Gamma-Ray Burst Monitor detection
  75. GRB 231124A: Fermi GBM Final Real-time Localization
  76. Fermi trigger No 722400249: Global MASTER-Net observations report
  77. GRB 231117A : MITSuME Akeno optical afterglow candidate detection
  78. GRB 231118A: MeerLICHT afterglow detection
  79. LIGO/Virgo/KAGRA S231118an: Identification of a GW compact binary merger candidate
  80. GRB 231117A : MITSuME Akeno optical upper limits
  81. Fermi GRB 231116A: Global MASTER-Net observations report
  82. GRB 231115A : MITSuME Akeno and Okayama optical upper limits
  83. GRB 231111A: Swift-XRT refined Analysis
  84. IceCube-231103A: No candidates from the Zwicky Transient Facility
  85. Fermi trigger No 721204446: Global MASTER-Net observations report
  86. Fermi GRB 231108A: Global MASTER-Net observations report
  87. GRB 231104A: 3.6m DOT optical upper limit
  88. Fermi GRB 231103A: Global MASTER-Net observations report
  89. GRB 231104A: AstroSat CZTI detection
  90. GRB 231104A: Swift-XRT refined Analysis
  91. IceCube Alert 231103.39: Global MASTER-Net observations report
  92. Fermi trigger No 720498201: Global MASTER-Net observations report
  93. IceCube-231027A: Upper limits from a search for additional neutrino events in IceCube
  94. GRB 231024A: AKO Optical Counterpart Candidate
  95. LIGO/Virgo/KAGRA S231029ai: Global MASTER-Net observations report
  96. IceCube Alert 231027.18: Global MASTER-Net observations report
  97. LIGO/Virgo/KAGRA S231025t: Global MASTER-Net observations report
  98. LIGO/Virgo/KAGRA S231025a: Global MASTER-Net observations report
  99. IC231004A: GRANDMA observations of AT2023uqf/ZTF23abidzvf candidate
  100. GRB 231024A: Fermi GBM Observation

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