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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"

36340 results found.

  1. GRB 230723B: Optical afterglow candidate from CAHA
  2. GRB 230723B: Bassano Bresciano Observatory upper limit
  3. GRB 230723B: Fermi GBM observation
  4. GRB 230723B: Swift-XRT refined Analysis
  5. GRB 230723B: non-detections from Observatoire de Haute-Provence
  6. GRB 230724A: Fermi GBM Final Real-time Localization
  7. GRB 230723B: Optical limit from CAHA
  8. GRB 230723B: Swift/UVOT Upper Limits
  9. Swift GRB 230723B: Global MASTER-Net observations report
  10. Swift-XRT position for GRB 230723B
  11. GRB 230723A: AGILE/MCAL detection
  12. GRB 230723B: Swift-XRT observations
  13. GRB 230723B: Swift detection of a burst
  14. Fermi GRB 230723A: Global MASTER-Net observations report
  15. GRB 230723A: Fermi GBM Final Real-time Localization
  16. IPN triangulation of GRB 230715D
  17. Swift Trigger 1180063 is not a GRB
  18. Swift Trigger 1180060 is not a GRB
  19. Swift Trigger 1180055 is not a GRB
  20. GRB 230718A: Final Localization Correction
  21. GRB 230718A: Fermi GBM Final Real-time Localization
  22. Fermi Gamma-ray Burst Monitor trigger 711329677/230717982 is not a GRB
  23. IPN triangulation of GRB 230712C (short)
  24. IPN triangulation of GRB 230712A (short)
  25. GRB 230717A: Fermi GBM Final Real-time Localization
  26. GRB 230715A: Fermi GBM Final Real-time Localization
  27. Fermi GRB 230713A: Global MASTER-Net observations report
  28. GRB 230713A: Fermi GBM Final Real-time Localization
  29. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  30. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  31. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  32. IceCube-230708A: Upper limits from Swift/BAT-GUANO
  33. GRB 230712B: Fermi GBM Final Localization
  34. GRB 230707A: Swift/BAT-GUANO position correction
  35. GRB 230712A: Fermi GBM Final Real-time Localization
  36. GRB 230709C: GRBAlpha detection
  37. GRB 230709B: GRBAlpha detection
  38. GRB 230709C: Fermi GBM Detection
  39. GRB 230709C: Fermi GBM Final Localization
  40. GRB 230707B: Fermi GBM Observation
  41. GRB 230710A: Fermi GBM Final Real-time Localization
  42. GRB 230709C: AstroSat CZTI detection
  43. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  44. GRB 230703A detected with multiple GRID detectors
  45. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  46. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  47. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  48. IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube
  49. IceCube-230707A: Upper limits from a search for additional neutrino events in IceCube
  50. Swift Trigger 1178410: possible GRB 230709A
  51. GRB 230628C: GRID Detection
  52. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  53. GRB 230707A: Swift-XRT observations
  54. GRB 230707B: Fermi GBM Final Real-time Localization
  55. GRB 230707A: Fermi GBM Detection
  56. GRB 230707A: Swift ToO observations
  57. GRB 230707A: Swift/BAT-GUANO arcminute localization of a burst
  58. Fermi GRB 230707A: Global MASTER-Net observations report
  59. GRB 230707A: Fermi GBM Final Real-time Localization
  60. IBAS trigger number 10311: not a real GRB
  61. GRB 230625A: Detection by GRID
  62. LIGO/Virgo/KAGRA S230529ay: Updated Sky localization and EM Bright Classification
  63. GRB 230626A: VZLUSAT-2 detection
  64. LVK S230619bd/GBM-230619: Upper limits from a two-week IceCube neutrino search
  65. GRB 230328B: LBT detection of the likely host galaxy
  66. Konus-Wind detection of GRB 220623A
  67. GRB 230701B: AstroSat CZTI detection
  68. GRB 230628E: Swift/UVOT Detection
  69. GRB 230628E: Swift-BAT refined analysis
  70. GRB 230702A: Fermi GBM Final Real-time Localization
  71. GRB 230628E: ATCA rapid radio follow-up
  72. GRB 230701A: Fermi GBM Final Real-time Localization
  73. LIGO/Virgo/KAGRA S230627c: Upper limits from Swift/BAT-GUANO
  74. IPN triangulation of GRB 230625B (ultra-long)
  75. GRB 230625B: CALET Gamma-Ray Burst Monitor detection
  76. GRB 230628E - VLT spectroscopic observations
  77. Fermi GRB 230628C: Global MASTER-Net observations report
  78. GRB 230625B: AstroSat CZTI detection
  79. GRB230628E: VLT optical identification of afterglow candidate
  80. GRB 230628E: Swift-XRT refined Analysis
  81. GRB 230628E: Enhanced Swift-XRT position (Correction to name in GCN 34115)
  82. GRB 230628A: Enhanced Swift-XRT position
  83. Fermi GRB 230628D: Global MASTER-Net observations report
  84. GRB 230628E: LCOGT Optical Upper Limit
  85. GRB 230628E: Swift detection of a burst
  86. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  87. GRB 230628D: Fermi GBM Final Real-time Localization
  88. GRB 230628C: Fermi GBM Final Real-time Localization
  89. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  90. GRB 230623B: CALET Gamma-Ray Burst Monitor detection
  91. GRB 230628A: Fermi GBM Final Localization
  92. GRB 230626A: GRBAlpha detection
  93. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  94. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  95. GRB230626A: Fermi GBM Detection
  96. Konus-Wind detection of GRB 230616A
  97. GRB 230618A: Swift-BAT refined analysis
  98. GRB 230625B: Swift/BAT-GUANO detection of a long burst
  99. GRB 230622A: Swift-BAT refined analysis
  100. GRB 230623A: Swift-XRT observations

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