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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"

36142 results found.

  1. GRB 180331A: Swift detection of a burst
  2. GRB 180329B: VLT/X-shooter spectroscopic observations
  3. GRB 180329B: Swift-BAT refined analysis
  4. GRB 180329B: Swift/UVOT Detection
  5. GRB 180329B: RATIR Optical Observations
  6. Swift Trigger 819863 is not a GRB
  7. GRB 180329B: NOT optical afterglow detection
  8. GRB 180329A: Swift-BAT refined analysis
  9. GRB 180329B: Swift-XRT refined Analysis
  10. GRB 180329B: Enhanced Swift-XRT position
  11. GRB 180329B: Swift detection of a burst with an optical afterglow
  12. GRB180325A: AstroSat CZTI detection
  13. Swift Trigger 819301: possible GRB 180329A
  14. GRB 180325A: VLT/X-shooter spectroscopic observations
  15. Konus-Wind observation of GRB 180318A
  16. Konus-Wind observation of GRB 180326A
  17. Konus-Wind observation of GRB 180317A
  18. GRB 180325A: further NOT observations
  19. IPN Triangulation of GRB 180326A (long)
  20. GRB 180325A: Swift/UVOT Detection
  21. Konus-Wind observation of GRB 180316A
  22. Konus-Wind observation of GRB 180324A
  23. Konus-Wind observation of GRB 180325A
  24. GRB 180325A, Swift-BAT refined analysis
  25. GRB 180325A: GROND observations
  26. GRB 180325A: Global MASTER-Net OT prompt observations
  27. GRB 180325A: TAROT Calern observatory optical observations
  28. GRB 180325A: D50 early optical follow-up
  29. GRB 180325A: Swift-XRT refined Analysis
  30. GRB 180325A: Enhanced Swift-XRT position
  31. GRB 180325A: Optical Photometry with SLKT
  32. GRB 180325A: RATIR Optical Observations
  33. GRB 180325A: prompt REM optical/NIR detection
  34. GRB 180325A: NOT redshift
  35. GRB 180325A: prompt LT observations
  36. GRB 180324A, Swift-BAT refined analysis
  37. GRB 180325A: Swift detection of a burst with an optical counterpart
  38. GRB 180324A: Swift/UVOT Upper Limits
  39. GRB 180324A: Swift-XRT refined Analysis
  40. GRB 180324A: Enhanced Swift-XRT position
  41. GRB 180324A: RATIR Optical Observations and Possible Afterglow Detection
  42. GRB 180324A: KAIT Optical Upper Limit
  43. GRB 180324A: Prompt enhanced Swift-XRT position
  44. GRB 180324A: Swift detection of a burst
  45. IBAS Alert n. 8033: Not a GRB
  46. IPN Triangulation of GRB 180318A (long)
  47. IPN Triangulation of GRB 180317A (short/hard)
  48. IBAS Alert n. 8032: Not a GRB
  49. GRB 180316A: RATIR Optical Observations
  50. GRB 180316A: MITSuME Akeno optical upper limits
  51. GRB 180316A: MITSuME Okayama optical upper limits
  52. GRB 180316A: TSHAO optical observations
  53. GRB 180314A: AstroSat CZTI detection
  54. GRB 180316A: RATIR Optical Observations, Possible Re-brightening
  55. Konus-Wind observation of GRB 180314A
  56. GRB 180316A: Swift-BAT refined analysis
  57. GRB 180316A: Swift-XRT refined Analysis
  58. GRB 180316A: Swift/UVOT Detection
  59. GRB 180316A: RATIR Optical Observations
  60. GRB 180316A: Enhanced Swift-XRT position
  61. GRB 180316A: LCO Cerro Tololo observations
  62. GRB 180314A: MITSuME Okayama optical upper limits
  63. GROND observations of GRB 180316A
  64. GRB180316A: MASTER-IAC OT light curve
  65. GRB 180316A: Prompt enhanced Swift-XRT position
  66. GRB 180316A: Swift detection of a burst
  67. GRB 180314B: RATIR Optical Observations
  68. GRB 180314B: Swift-BAT refined analysis
  69. GRB 180314B: Zeiss-1000/CrAO optical upper limit
  70. GRB 180314B: Swift/UVOT Upper Limits
  71. GRB 180314B: Swift-XRT refined Analysis
  72. GRB 180314B: Enhanced Swift-XRT position
  73. GRB 180313A: Fermi GBM detection
  74. GRB 180314B: Prompt enhanced Swift-XRT position
  75. GRB 180314B: Swift detection of a burst
  76. GRB 180314A: Swift-BAT refined analysis
  77. Swift Trigger on MAXI J1820+070
  78. GRB 180314A: TAROT La Silla observatory optical observations
  79. GRB 180314A: LCO Siding Springs observations
  80. GRB 180314A: Swift-XRT refined Analysis
  81. GRB 180314A: Fermi GBM observation
  82. GRB 180314A: VLT/X-shooter redshift
  83. GRB 180314A: Swift/UVOT Detection
  84. GRB 180314A: REM optical/NIR observations
  85. GRB 180314A: MASTER-Net OT dtetction
  86. GRB 180314A: Enhanced Swift-XRT position
  87. GRB180314A: GROND detection of the afterglow
  88. GRB 180314A: Swift detection of a burst with an optical counterpart
  89. GRB 180305A: AstroSat CZTI detection
  90. GRB 180311A: Swift/UVOT Upper Limits
  91. GRB 180311A, Swift-BAT refined analysis
  92. GRB 180311A: Swift-XRT refined Analysis
  93. Swift detection of MAXI J1820+070
  94. GRB 180311A: Enhanced Swift-XRT position
  95. GRB 180311A: Prompt enhanced Swift-XRT position
  96. GRB 180311A: Swift detection of a burst
  97. GRB 180305A CALET Gamma-Ray Burst Monitor detection
  98. GRB 180305A: RATIR Optical Observations
  99. GRB 180305A: Swift/UVOT Upper Limits
  100. GRB 180305A: Mondy optical observations

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