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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"

28293 results found.

  1. GRB 180504A: Swift-BAT refined analysis
  2. GRB 180505A: Fermi GBM detection
  3. GRB 180504A: ePESSTO NTT NIR observations
  4. Correction to Swift-XRT light curve fit for GRB 180504A in GCN 22685
  5. GRB 180504A: Swift-XRT refined Analysis
  6. GRB 180504A: NOT afterglow candidate
  7. GRB 180504A: Swift detection of a burst
  8. IPN Triangulation of GRB 180427A
  9. GRB 180427A: Fermi GBM detection
  10. GRB 180425A: Swift-XRT refined Analysis
  11. GRB 180425A: Swift-BAT refined analysis
  12. GRB 180425A: Swift/UVOT Upper Limits
  13. GRB 180425A: Enhanced Swift-XRT position
  14. GRB 180425A: Swift detection of a burst
  15. GRB 180418A: TAROT La Silla observatory early optical observations
  16. GRB 180418A: MITSuME Ishigakijima Optical Observation
  17. GRB 180418A : SQUEAN observations
  18. GRB 180418A: Further GROND observations
  19. GRB 180418A: Swift/UVOT Detection
  20. GRB 180418A: Continued RATIR Optical Observations
  21. GRB 180418A: Imaging of the optical afterglow with the 1.3 m DFOT and 3.6 m DOT in ARIES, India
  22. GRB 180418A GROND observations
  23. GRB 180418A: Gemini-North imaging and spectroscopy
  24. GRB 180418A: Swift-BAT refined analysis
  25. GRB 180418A: Swift-XRT refined Analysis
  26. GRB 180418A: RATIR Optical Observations
  27. LIGO/Virgo G299232: LOFAR follow-up
  28. GRB 180418A: Enhanced Swift-XRT position
  29. GRB 180418A: Swift-XRT observations
  30. GRB 180416A: Fermi GBM detection
  31. GRB 180409A: Swift-XRT afterglow detection
  32. GRB 180411A: Swift/UVOT Upper Limit
  33. GRB 180411A: Tautenburg observations
  34. GRB 180410A: Fermi GBM observation
  35. GRB 180411A: Fermi GBM detection
  36. GRB 180411A: Swift-BAT refined analysis
  37. GRB 180411A: Swift-XRT refined Analysis
  38. GRB 180410A: RATIR Optical Observations
  39. GRB 180411A: Swift detection of a burst
  40. GRB 180410A: Swift-XRT refined Analysis
  41. GRB 180410A: Swift-BAT refined analysis
  42. GRB 180410A: Swift/UVOT Upper Limits
  43. GRB 180409A: Fermi GBM observation
  44. GRB 180409A: Swift-XRT observations
  45. GRB 180410A: Enhanced Swift-XRT position
  46. GRB 180410A: Swift detection of a burst or a Galactic transient.
  47. IPN Triangulation of GRB 180409A
  48. GRB 180402A: ISON-NM early optical limits
  49. GRB 180407A: Swift-BAT refined analysis
  50. Swift Trigger 823014: TAROT Calern observatory optical observations
  51. GRB 180407A: COATLI Upper Limits
  52. Swift Trigger 823014 is probably not a GRB
  53. GRB 180404B: Swift/UVOT Detection
  54. Chandra observations of GRB161219B 400 days after the explosion
  55. GRB 180404A: Swift/UVOT Detection
  56. GRB 180404A: Swift-XRT refined Analysis
  57. GRB 180404B: Swift-BAT refined analysis
  58. GRB 180404A: Swift-BAT refined analysis
  59. GRB 180404B: Swift-XRT refined Analysis
  60. GRB 180404B: Enhanced Swift-XRT position
  61. GRB 180404A: MASTER-OAFA OT observation
  62. GRB 180404A: Enhanced Swift-XRT position
  63. GRB 180404B: Swift detection of a burst with an optical counterpart
  64. GRB 180404A: Swift detection of a burst with an optical afterglow
  65. GRB 180402A: Swift/UVOT Upper Limits
  66. GRB 180402A: Swift-XRT refined Analysis
  67. GRB 180402A: Fermi GBM detection
  68. GRB 180402A, Swift-BAT refined analysis
  69. GRB 180402A: RATIR Upper Limits
  70. GRB 180402A: LCO McDonald observations
  71. GRB 180402A: Swift detection of a possibly short burst
  72. GRB 180331B: Swift/UVOT Upper Limits
  73. GRB 180331B: Swift-XRT refined Analysis
  74. GRB 180331B: AbAO optical observations
  75. GRB 180331B: Swift-BAT refined analysis
  76. GRB 180331B: Enhanced Swift-XRT position
  77. GRB 180331A: Swift-BAT refined analysis
  78. GRB 180331B: Swift detection of a burst
  79. GRB 180331A: Swift-XRT refined Analysis
  80. GRB 180331A: Swift/UVOT Upper Limits
  81. GRB 180331A: Enhanced Swift-XRT position
  82. GRB 180331A: Swift detection of a burst
  83. GRB 180329B: Swift-BAT refined analysis
  84. GRB 180329B: Swift/UVOT Detection
  85. GRB 180329B: RATIR Optical Observations
  86. Swift Trigger 819863 is not a GRB
  87. GRB 180329B: NOT optical afterglow detection
  88. GRB 180329A: Swift-BAT refined analysis
  89. GRB 180329B: Swift-XRT refined Analysis
  90. GRB 180329B: Enhanced Swift-XRT position
  91. GRB 180329B: Swift detection of a burst with an optical afterglow
  92. Swift Trigger 819301: possible GRB 180329A
  93. GRB 180325A: Swift/UVOT Detection
  94. Konus-Wind observation of GRB 180325A
  95. GRB 180325A, Swift-BAT refined analysis
  96. GRB 180325A: GROND observations
  97. GRB 180325A: Global MASTER-Net OT prompt observations
  98. GRB 180325A: TAROT Calern observatory optical observations
  99. GRB 180325A: D50 early optical follow-up
  100. GRB 180325A: Swift-XRT refined Analysis

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