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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"

36139 results found.

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

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