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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"

36423 results found.

  1. Swift Trigger 1180060 is not a GRB
  2. Swift Trigger 1180055 is not a GRB
  3. GRB 230718A: Final Localization Correction
  4. GRB 230718A: Fermi GBM Final Real-time Localization
  5. Fermi Gamma-ray Burst Monitor trigger 711329677/230717982 is not a GRB
  6. IPN triangulation of GRB 230712C (short)
  7. IPN triangulation of GRB 230712A (short)
  8. GRB 230717A: Fermi GBM Final Real-time Localization
  9. GRB 230715A: Fermi GBM Final Real-time Localization
  10. Fermi GRB 230713A: Global MASTER-Net observations report
  11. GRB 230713A: Fermi GBM Final Real-time Localization
  12. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  13. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  14. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  15. IceCube-230708A: Upper limits from Swift/BAT-GUANO
  16. GRB 230712B: Fermi GBM Final Localization
  17. GRB 230707A: Swift/BAT-GUANO position correction
  18. GRB 230712A: Fermi GBM Final Real-time Localization
  19. GRB 230709C: GRBAlpha detection
  20. GRB 230709B: GRBAlpha detection
  21. GRB 230709C: Fermi GBM Detection
  22. GRB 230709C: Fermi GBM Final Localization
  23. GRB 230707B: Fermi GBM Observation
  24. GRB 230710A: Fermi GBM Final Real-time Localization
  25. GRB 230709C: AstroSat CZTI detection
  26. GRB 230707B: CALET Gamma-Ray Burst Monitor detection
  27. GRB 230703A detected with multiple GRID detectors
  28. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  29. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  30. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  31. IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube
  32. IceCube-230707A: Upper limits from a search for additional neutrino events in IceCube
  33. Swift Trigger 1178410: possible GRB 230709A
  34. GRB 230628C: GRID Detection
  35. GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  36. GRB 230707A: Swift-XRT observations
  37. GRB 230707B: Fermi GBM Final Real-time Localization
  38. GRB 230707A: Fermi GBM Detection
  39. GRB 230707A: Swift ToO observations
  40. GRB 230707A: Swift/BAT-GUANO arcminute localization of a burst
  41. Fermi GRB 230707A: Global MASTER-Net observations report
  42. GRB 230707A: Fermi GBM Final Real-time Localization
  43. IBAS trigger number 10311: not a real GRB
  44. GRB 230625A: Detection by GRID
  45. LIGO/Virgo/KAGRA S230529ay: Updated Sky localization and EM Bright Classification
  46. GRB 230626A: VZLUSAT-2 detection
  47. LVK S230619bd/GBM-230619: Upper limits from a two-week IceCube neutrino search
  48. GRB 230328B: LBT detection of the likely host galaxy
  49. Konus-Wind detection of GRB 220623A
  50. GRB 230701B: AstroSat CZTI detection
  51. GRB 230628E: Swift/UVOT Detection
  52. GRB 230628E: Swift-BAT refined analysis
  53. GRB 230702A: Fermi GBM Final Real-time Localization
  54. GRB 230628E: ATCA rapid radio follow-up
  55. GRB 230701A: Fermi GBM Final Real-time Localization
  56. LIGO/Virgo/KAGRA S230627c: Upper limits from Swift/BAT-GUANO
  57. IPN triangulation of GRB 230625B (ultra-long)
  58. GRB 230625B: CALET Gamma-Ray Burst Monitor detection
  59. GRB 230628E - VLT spectroscopic observations
  60. Fermi GRB 230628C: Global MASTER-Net observations report
  61. GRB 230625B: AstroSat CZTI detection
  62. GRB230628E: VLT optical identification of afterglow candidate
  63. GRB 230628E: Swift-XRT refined Analysis
  64. GRB 230628E: Enhanced Swift-XRT position (Correction to name in GCN 34115)
  65. GRB 230628A: Enhanced Swift-XRT position
  66. Fermi GRB 230628D: Global MASTER-Net observations report
  67. GRB 230628E: LCOGT Optical Upper Limit
  68. GRB 230628E: Swift detection of a burst
  69. GRB 230628D: BALROG localization (Fermi Trigger 709676556 / GRB 230628849)
  70. GRB 230628D: Fermi GBM Final Real-time Localization
  71. GRB 230628C: Fermi GBM Final Real-time Localization
  72. GRB 230628B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  73. GRB 230623B: CALET Gamma-Ray Burst Monitor detection
  74. GRB 230628A: Fermi GBM Final Localization
  75. GRB 230626A: GRBAlpha detection
  76. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  77. LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations
  78. GRB230626A: Fermi GBM Detection
  79. Konus-Wind detection of GRB 230616A
  80. GRB 230618A: Swift-BAT refined analysis
  81. GRB 230625B: Swift/BAT-GUANO detection of a long burst
  82. GRB 230622A: Swift-BAT refined analysis
  83. GRB 230623A: Swift-XRT observations
  84. GRB 230625A: Fermi GBM Final Real-time Localization
  85. INTEGRAL upper limit on any GRB associated with ZTF23aaoohpy/AT2023lcr
  86. ATLAS23msn/ZTF23aaoohpy/AT2023lcr: Zeiss-1000 of Koshka observatory optical observations
  87. GRB 230623B: Swift/BAT-GUANO detection of a long burst outside the coded FOV 
  88. GRB 230623A: Tiled Swift observations
  89. MAXI GRB 230623A: MASTER optical observations
  90. GRB 230623A: Tiled Swift observations
  91. GRB 230622A: ATCA rapid radio follow-up
  92. GRB 230622A: Swift-XRT refined Analysis
  93. GRB 230623A: MAXI/GSC detection
  94. Swift GRB 230622A: Global MASTER-Net observations report
  95. Fermi GBM-230619: AstroSat CZTI non-detection and upper limits for the sub-threshold candidate
  96. GRB 230622A: Swift detection of a burst
  97. GRB 230621A: Fermi GBM Final Localization Correction
  98. Fermi GBM-230619: A soft subthreshold candidate potentially associated with a subthreshold LIGO/Virgo compact binary merger candidate
  99. ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations
  100. ZTF23aaoohpy (AT2023lcr/ATLAS23msn): Upper limits from Konus-Wind observations

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