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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"

37768 results found.

  1. GRB 230723B: Montarrenti Observatory upper limit
  2. GRB 230723B: Optical afterglow candidate from CAHA
  3. GRB 230723B: Bassano Bresciano Observatory upper limit
  4. GRB 230723B: Fermi GBM observation
  5. GRB 230723B: Swift-XRT refined Analysis
  6. GRB 230723B: non-detections from Observatoire de Haute-Provence
  7. Fermi trigger No 711853834: Global MASTER-Net observations report
  8. GRB 230724A: Fermi GBM Final Real-time Localization
  9. Fermi trigger No 711805358: Global MASTER-Net observations report
  10. GRB 230723B: Optical limit from CAHA
  11. GRB 230723B: Swift/UVOT Upper Limits
  12. Swift GRB 230723B: Global MASTER-Net observations report
  13. Swift-XRT position for GRB 230723B
  14. GRB 230723A: AGILE/MCAL detection
  15. GRB 230723B: Swift-XRT observations
  16. GRB 230723B: Swift detection of a burst
  17. Fermi GRB 230723A: Global MASTER-Net observations report
  18. GRB 230723A: Fermi GBM Final Real-time Localization
  19. IPN triangulation of GRB 230715D
  20. Swift Trigger 1180063 is not a GRB
  21. Swift Trigger 1180060 is not a GRB
  22. Swift Trigger 1180055 is not a GRB
  23. GRB 230718A: Final Localization Correction
  24. GRB 230718A: Fermi GBM Final Real-time Localization
  25. Fermi Gamma-ray Burst Monitor trigger 711329677/230717982 is not a GRB
  26. IPN triangulation of GRB 230712C (short)
  27. IPN triangulation of GRB 230712A (short)
  28. GRB 230717A: Fermi GBM Final Real-time Localization
  29. Fermi trigger No 711088412: Global MASTER-Net observations report
  30. GRB 230715A: Fermi GBM Final Real-time Localization
  31. Fermi GRB 230713A: Global MASTER-Net observations report
  32. GRB 230713A: Fermi GBM Final Real-time Localization
  33. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  34. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  35. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  36. IceCube-230708A: Upper limits from Swift/BAT-GUANO
  37. GRB 230712B: Fermi GBM Final Localization
  38. GRB 230707A: Swift/BAT-GUANO position correction
  39. GRB 230712A: Fermi GBM Final Real-time Localization
  40. Fermi trigger No 710741042: Global MASTER-Net observations report
  41. GRB 230709C: GRBAlpha detection
  42. GRB 230709B: GRBAlpha detection
  43. GRB 230709C: Fermi GBM Detection
  44. GRB 230709C: Fermi GBM Final Localization
  45. GRB 230707B: Fermi GBM Observation
  46. GRB 230710A: Fermi GBM Final Real-time Localization
  47. GRB 230709C: AstroSat CZTI detection
  48. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  49. GRB 230703A detected with multiple GRID detectors
  50. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  51. Fermi-LAT gamma-ray observations of IceCube-230708A
  52. Fermi-LAT gamma-ray observations of IceCube-230707B
  53. Fermi-LAT gamma-ray observations of IceCube-230707A
  54. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  55. Swift Trigger 1178410: possible GRB 230709A
  56. GRB 230628C: GRID Detection
  57. IceCube-230708A - IceCube observation of a high-energy neutrino candidate track-like event
  58. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  59. GRB 230707A: Swift-XRT observations
  60. IceCube-230707B - IceCube observation of a high-energy neutrino candidate track-like event
  61. GRB 230707B: Fermi GBM Final Real-time Localization
  62. IceCube-230707A - IceCube observation of a high-energy neutrino candidate track-like event
  63. GRB 230707A: Fermi GBM Detection
  64. GRB 230707A: Swift ToO observations
  65. GRB 230707A: Swift/BAT-GUANO arcminute localization of a burst
  66. Fermi GRB 230707A: Global MASTER-Net observations report
  67. GRB 230707A: Fermi GBM Final Real-time Localization
  68. IBAS trigger number 10311: not a real GRB
  69. GRB 230625A: Detection by GRID
  70. Fermi trigger No 710117592: Global MASTER-Net observations report
  71. GRB 230626A: VZLUSAT-2 detection
  72. GRB 230328B: LBT detection of the likely host galaxy
  73. Konus-Wind detection of GRB 220623A
  74. GRB 230701B: AstroSat CZTI detection
  75. GRB 230628E: Swift/UVOT Detection
  76. GRB 230628E: Swift-BAT refined analysis
  77. GRB 230702A: Fermi GBM Final Real-time Localization
  78. GRB 230628E: ATCA rapid radio follow-up
  79. GRB 230701A: Fermi GBM Final Real-time Localization
  80. LIGO/Virgo/KAGRA S230627c: Upper limits from Swift/BAT-GUANO
  81. IPN triangulation of GRB 230625B (ultra-long)
  82. GRB 230625B: CALET Gamma-Ray Burst Monitor detection
  83. GRB 230628E - VLT spectroscopic observations
  84. Fermi GRB 230628C: Global MASTER-Net observations report
  85. GRB 230625B: AstroSat CZTI detection
  86. GRB230628E: VLT optical identification of afterglow candidate
  87. GRB 230628E: Swift-XRT refined Analysis
  88. GRB 230628E: Enhanced Swift-XRT position (Correction to name in GCN 34115)
  89. GRB 230628A: Enhanced Swift-XRT position
  90. Fermi GRB 230628D: Global MASTER-Net observations report
  91. GRB 230628E: LCOGT Optical Upper Limit
  92. GRB 230628E: Swift detection of a burst
  93. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  94. GRB 230628D: Fermi GBM Final Real-time Localization
  95. GRB 230628C: Fermi GBM Final Real-time Localization
  96. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  97. GRB 230623B: CALET Gamma-Ray Burst Monitor detection
  98. GRB 230628A: Fermi GBM Final Localization
  99. GRB 230626A: GRBAlpha detection
  100. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation

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