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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"

19953 results found.

  1. Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events
  2. GRB 240118A: Swift ToO observations
  3. GRB 240118A: AbAO optical upper limit
  4. GRB 240118A: NuSTAR Offline Analysis of the GRB
  5. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  6. GRB 240118A: Fermi-LAT detection
  7. GRID detection of GRB 231230A
  8. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  9. Swift Trigger 1209406 is not an astrophysical event
  10. Swift Triggers 1209401 and 1209403 are not astrophysical events
  11. IPN triangulation of GRB 240112A (long)
  12. Swift Triggers 1209371 through 1209374 are not astrophysical events
  13. Swift Triggers 1209369 and 1209370 are not astrophysical events
  14. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  15. GRB 240112C: Glowbug gamma-ray detection
  16. GRB 240112C: VZLUSAT-2 detection
  17. Konus-Wind detection of GRB 240112C
  18. GRB 240112C: GRBAlpha detection
  19. GRB 240112C: Swift/UVOT Detection
  20. GRB 240112C: Fermi GBM Detection
  21. GRB 240112C: Swift-XRT refined Analysis
  22. GRB 240112C: SAO RAS optical observations
  23. Swift GRB 240112C: Global MASTER-Net observations report
  24. GRB 240109A: Swift-BAT refined analysis
  25. GRB 240112C: Swift detection of a burst with an optical counterpart
  26. GRB 240112A: GECAM detection of a burst
  27. GRB 240109A: Fermi GBM Observation
  28. GRB 231214A: ATCA Radio Upper Limits
  29. Konus-Wind detection of GRB 240101C
  30. Swift GRB240109.17: Global MASTER-Net observations report
  31. GRB 240109A: Swift detection of a short burst
  32. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  33. IPN triangulation of GRB 240101C (short)
  34. GRB GRB240101C: Fermi GBM observation
  35. GRB 240101A: 1.3m DFOT optical observations
  36. GRB 240102A: 1.3m DFOT optical upper limit
  37. GRB 240101B: 1.3m DFOT optical upper limit
  38. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  39. GRB 231220A: Swift-UVOT upper limit
  40. GRB 240102A: Swift-BAT refined analysis
  41. GRB 240102A: Swift/UVOT Upper Limits
  42. GRB 231230A: Swift-BAT refined analysis
  43. GRB 240101A: Swift-BAT refined analysis
  44. GRB 240101B: Swift-BAT refined analysis
  45. GRB 240102A: Enhanced Swift-XRT position
  46. GRB 240101B: Swift-XRT refined Analysis
  47. GRB 240102A: Swift-XRT refined Analysis
  48. GRB 240102A: LCOGT Optical Upper Limits
  49. GRB240102A: BOOTES-6/DPRT optical upper limit
  50. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  51. GRB 240102A: Swift detection of a burst
  52. GRB 240101A: Terskol Zeiss-2000 optical observations
  53. GRB 240101B: Swift/UVOT Upper Limits
  54. GRB 240101A: Swift/UVOT Upper Limits
  55. GRB 240101A: Swift-XRT refined Analysis
  56. GRB 240101B: Enhanced Swift-XRT position
  57. GRB 240101B: KAIT Optical Upper Limit
  58. GRB 240101A: KAIT Optical Upper Limit
  59. GRB 240101A: Enhanced Swift-XRT position
  60. Swift GRB240101.85: Global MASTER-Net observations report
  61. GRB 240101B: Swift detection of a burst
  62. GRB 240101A: Swift detection of a burst
  63. GRB231230A: Fermi GBM Observation
  64. GRB 231230A: Swift-XRT refined Analysis
  65. GRB 231230A: GOTO optical upper limits
  66. GRB 231230A: Enhanced Swift-XRT position
  67. GRB 231230A: Swift/UVOT Upper Limits
  68. GRB 231230A: Prompt enhanced Swift-XRT position
  69. GRB 231230A: Swift detection of a burst
  70. Swift GRB231230.06: Global MASTER-Net observations report
  71. GRB 231210B: BOOTES-7 optical upper limit
  72. Swift Triggers 1205103, 1205104, 1205107 and 1205110 are not astrophysical events
  73. LIGO/Virgo/KAGRA S231224e: Upper limits from Swift/BAT-GUANO
  74. GRB 231222B: Swift-XRT afterglow detection
  75. GRB 231222B: Fermi-LAT detection
  76. GRB 231222A: Tiled Swift observations
  77. GRID detection of GRB 231215A
  78. GRB 231220A: Swift-XRT follow-up observations
  79. GRB 231220A: Swift ToO observations
  80. GRB 231220A: Swift/BAT-GUANO arcminute localization of a long burst
  81. GRB 231210B: new optical transient detected with the Greenhill Observatory University of Tasmania within the BAT-Swift enhanced position
  82. GRID detection of GRB 231205B
  83. GRB 231216A: GAD Observatory, La Spezia, Italy upper limit
  84. GRB 231214B: Fermi GBM observation
  85. GRB 231216A: 10.4 m GTC optical upper limit
  86. GRB 231216A: Nanshan/HMT optical upper limit
  87. GRB 231216A: LCOGT Optical Upper Limits
  88. GRB 231216A: Osservatorio Astronomico Nastro Verde upper limit
  89. GRB 231216A: Swift-XRT refined analysis correction
  90. GRB 231215A: Osservatorio Astronomico Nastro Verde upper limit
  91. GRB 231216A: Swift-XRT refined Analysis
  92. GRB 231216A: AST3-3 YaoAn Optical Upper Limit
  93. GRB 231216A: REM NIR upper limits
  94. GRB 231216A: Swift/UVOT Upper Limits
  95. GRB 231216A: Swift-BAT refined analysis
  96. GRB 231215A: Swift-BAT refined analysis
  97. GRB 231214A: Swift-BAT refined analysis
  98. GRB 231216A: R-band observations from T120 at Observatoire de Haute-Provence
  99. GRB 231216A: GIT optical upper limit
  100. GRB 231216A: BOOTES-2/TELMA optical upper limit

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