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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"

24537 results found.

  1. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  2. GRB 240109B: Fermi GBM Final Real-time Localization
  3. IceCube-240105A: Three candidates from the Zwicky Transient Facility
  4. LIGO/Virgo/KAGRA S240109a: Updated Sky localization
  5. Konus-Wind detection of GRB 240101C
  6. Swift GRB240109.17: Global MASTER-Net observations report
  7. LIGO/Virgo/KAGRA S240109a: Identification of a GW compact binary merger candidate
  8. GRB 240109A: Swift detection of a short burst
  9. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  10. Update of IceCube-240105A - Corrected errors
  11. GRB 240106A: GRBAlpha detection
  12. LIGO/Virgo/KAGRA S240107b: Updated Sky localization and Source Classification
  13. Fermi trigger No 726347794: Global MASTER-Net observations report
  14. LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate
  15. GRB 240106B: Fermi GBM Final Real-time Localization
  16. Fermi trigger No 726194053: Global MASTER-Net observations report
  17. GRB 240106A: Fermi GBM Final Real-time Localization
  18. IPN triangulation of GRB 240101C (short)
  19. GRB GRB240101C: Fermi GBM observation
  20. IceCube Alert 240105.52: Global MASTER-Net observations report
  21. GRB 240101A: 1.3m DFOT optical observations
  22. IceCube-240105A - IceCube observation of a high-energy neutrino candidate track-like event
  23. GRB 240102A: 1.3m DFOT optical upper limit
  24. GRB 240101B: 1.3m DFOT optical upper limit
  25. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  26. LIGO/Virgo/KAGRA S240104bl: Updated Sky localization
  27. LIGO/Virgo/KAGRA S240104bl: Identification of a GW compact binary merger candidate
  28. GRB 231220A: Swift-UVOT upper limit
  29. GRB 240102A: Swift-BAT refined analysis
  30. GRB 231230A: Swift-BAT refined analysis
  31. GRB 240101A: Swift-BAT refined analysis
  32. GRB 240101B: Swift-BAT refined analysis
  33. GRB 240101B: Swift-XRT refined Analysis
  34. GRB 240102A: Swift-XRT refined Analysis
  35. GRB 240102A: LCOGT Optical Upper Limits
  36. Fermi trigger No 725857207: Global MASTER-Net observations report
  37. GRB 240102B: Fermi GBM Final Real-time Localization
  38. IceCube-Cascade 231230A: Upper limits from a search for additional neutrino events in IceCube
  39. GRB 240102A: Swift detection of a burst
  40. GRB 240101C: GRBAlpha detection
  41. GRB 240101C: Fermi GBM Final Localization
  42. Swift GRB240101.85: Global MASTER-Net observations report
  43. GRB 240101A: Swift detection of a burst
  44. Fermi trigger No 725806648: Global MASTER-Net observations report
  45. LIGO/Virgo/KAGRA S231231ag: Updated Sky localization and Source Classification
  46. LIGO/Virgo/KAGRA S231231ag: Identification of a GW compact binary merger candidate
  47. GRB231230A: Fermi GBM Observation
  48. GRB 231230A: NOT optical upper limits
  49. Fermi trigger No 725592555: Global MASTER-Net observations report
  50. GRB 231230A: Swift detection of a burst
  51. Swift GRB231230.06: Global MASTER-Net observations report
  52. GRB 231230A: Fermi GBM Final Real-time Localization
  53. LIGO/Virgo/KAGRA S231224e: Upper limits from Swift/BAT-GUANO
  54. IPN triangulation of GRB 231224A (short)
  55. LIGO/Virgo/KAGRA S231226av: Updated Sky localization
  56. LIGO/Virgo/KAGRA S231226av: Identification of a GW compact binary merger candidate
  57. Fermi trigger No 725143760: Global MASTER-Net observations report
  58. GRB 231224A: Fermi GBM Final Real-time Localization
  59. GRB 231222B: GRBAlpha detection
  60. LIGO/Virgo/KAGRA S231224e: Updated Sky localization and Source Classification
  61. LIGO/Virgo/KAGRA S231224e: Identification of a GW compact binary merger candidate
  62. LIGO/Virgo/KAGRA S231223j: Updated Sky localization
  63. GRB 231222B: Swift-XRT afterglow detection
  64. LIGO/Virgo/KAGRA S231223j: Identification of a GW compact binary merger candidate
  65. Fermi trigger No 724921799: Global MASTER-Net observations report
  66. GRB 231222B: Fermi GBM Detection
  67. LAT GRB231222.31: Global MASTER-Net observations report
  68. GRB 231222B: Fermi-LAT detection
  69. GRID detection of GRB 231215A
  70. GRB 231222A: Fermi GBM Final Real-time Localization
  71. GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst
  72. Fermi trigger No 724781422: Global MASTER-Net observations report
  73. GRB 231220A: Fermi GBM Final Real-time Localization
  74. GRB 231210B: new optical transient detected with the Greenhill Observatory University of Tasmania within the BAT-Swift enhanced position
  75. Fermi trigger No 724698747: Global MASTER-Net observations report
  76. GRB 231219A: Fermi GBM Final Real-time Localization
  77. GRB 231214B: Fermi GBM observation
  78. GRB 231216A: LCOGT Optical Upper Limits
  79. GRB 231216A: REM NIR upper limits
  80. GRB 231216A: Swift-BAT refined analysis
  81. GRB 231215A: Swift-BAT refined analysis
  82. GRB 231214A: Swift-BAT refined analysis
  83. GRB 231216A: R-band observations from T120 at Observatoire de Haute-Provence
  84. GRB 231216A: NOT optical upper limits
  85. GRB 231215A: GRBAlpha detection
  86. Swift GRB231216.77: Global MASTER-Net observations report
  87. GRB 231216A: Swift detection of a burst
  88. Konus-Wind detection of GRB 231215A
  89. GRB 231205B: VZLUSAT-2 detection
  90. GRB 231204A: VZLUSAT-2 detection
  91. GRB 231215A: Fermi GBM observation
  92. LIGO/Virgo/KAGRA S231215i: 3 counterpart neutrino candidate events from an IceCube neutrino search
  93. GRB 231215A: AKO Optical Upper Limit
  94. GRB 231215A: AGILE detection
  95. GRB 231214A: Fermi GBM observation
  96. Konus-Wind detection of GRB 231210B
  97. Fermi trigger No 724326442: Global MASTER-Net observations report
  98. GRB 231214A: REM optical/NIR upper limits
  99. GRB 231215A : MITSuME Akeno optical afterglow candidate detection
  100. Swift GRB231215.41: Global MASTER-Net observations report

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