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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"

21934 results found.

  1. GRB 140419A: Mondy optical observations
  2. GRB 140419A: Continued RATIR Optical and NIR Observations
  3. GRB 140419A: Continued RATIR Optical and NIR Observations
  4. Swift Trigger 596641 is not a GRB
  5. Konus-Wind observation of GRB 140419A
  6. GRB 140419A, Optical Observations
  7. GRB 140419A: MITSuME Ishigakijima Optical Observation
  8. GRB 140419A: MITSuME Okayama Optical Observation
  9. GRB 140419A: Swift UVOT refined analysis
  10. GRB 140419A: Swift-XRT refined Analysis
  11. GRB 140419A: Swift-BAT refined analysis
  12. GRB 140419A: Enhanced Swift-XRT position
  13. GRB 140419A: RATIR Optical and NIR Observations
  14. GRB 140419A: Swift detection of a burst with optical afterglow
  15. Konus-Wind observation of GRB 140416A
  16. GRB 140414A: Swift/UVOT Upper Limit
  17. GRB 140414A: Swift-XRT observations
  18. GRB 140414A: TNG optical observations
  19. GRB 140413A: Swift/UVOT Observations of the Optical Afterglow
  20. GRB 140412A: Swift/UVOT Upper Limits
  21. Konus-Wind observation of GRB 140413A
  22. GRB 140413A: Swift-XRT refined Analysis
  23. GRB 140413A: TAROT La Silla observatory optical observations
  24. GRB 140413A: Swift-XRT observations
  25. GRB 140412A: Enhanced Swift-XRT position
  26. GRB 140413A: GROND afterglow candidate
  27. GRB 140412A: Swift detection of a burst
  28. GRB 140408A: 1.5m OSN optical upper limit
  29. Swift Trigger 595345 is not an astrophysical source
  30. Swift-BAT trigger 595162 is noise
  31. GRB 140408A: MITSuME Akeno Optical observation
  32. Fermi418277210: iPTF optical observations
  33. GRB 140408A: RATIR Optical Upper Limits
  34. GRB 140408A: GROND Detection of an Afterglow Candidate
  35. GRB 140408A: Swift/UVOT Upper Limits
  36. GRB 140408A: MITSuME Okayama upper limits
  37. GRB 140408A: Enhanced Swift-XRT position
  38. GRB 140408A: Swift detection of a burst
  39. GRB 140402A: Deep limit on the optical afterglow from Magellan observations
  40. GRB 140331A: Continued RATIR Optical and NIR Observations
  41. GRB 140402A: MASTER optical observations
  42. GRB 140402A: Marginal BAT detection
  43. Swift trigger 594286: Is likely a noise trigger
  44. GRB 140301A: Zadko observatory - Gingin optical observations
  45. GRB 140331A: Swift/UVOT Upper Limits
  46. GRB 140302A: TAROT La Silla observatory optical observations
  47. GRB 140323A: Zadko observatory - Gingin optical observations
  48. GRB 140331A: Zadko observatory - Gingin optical observations
  49. GRB 140129B: AAO optical upper limit
  50. GRB 140129A: Mondy optical observations
  51. GRB 140331A: MITSuME Okayama upper limits
  52. GRB 140331A: Enhanced Swift-XRT position
  53. GRB 140331A: RATIR Optical and NIR Observations
  54. GRB 140331A: Swift detection of a burst
  55. GRB 140329A: Fermi-LAT detection
  56. Konus-Wind observation of GRB 140329A
  57. GRB 140320D: MASTER optical observations
  58. GRB 140329A: Fermi GBM observation of a bright burst
  59. GRB 140320D: Suzaku WAM observation of the prompt emission
  60. GRB 140323A : Suzaku WAM observation of the prompt emission
  61. GRB 140226A/iPTF14yb: Mondy optical observations
  62. GRB 140320C: Mondy optical observations and afterglow confirmation
  63. Konus-Wind observation of GRB 140323A
  64. GRB 140323A: Swift/UVOT Upper Limits
  65. GRB 140323A: Enhanced Swift-XRT position
  66. GRB 140323A: Swift detection of a burst
  67. GRB 140320A: RATIR Optical and NIR Observations
  68. Konus-Wind observation of GRB 140320D
  69. GRB 140320B: P60 detection of a very red afterglow
  70. IPN Triangulation of very intense GRB 140320D
  71. GRB 140320C: Mini-GWAC prompt observation
  72. GRB 140320C: Swift/UVOT Upper Limits
  73. GRB 140320B: Swift/UVOT Upper Limits
  74. GRB 140320A: Swift/UVOT Upper Limits
  75. GRB 140320C: Swift-XRT observations
  76. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  77. GRB 140320B: Swift-XRT detection of the afterglow
  78. GRB 140320C: Mondy optical observations
  79. GRB 140320A: Enhanced Swift-XRT position
  80. GRB 140320A: Swift-XRT detection of an afterglow candidate
  81. GRB 140320C: MASTER optical observations
  82. GRB 140320C: FTN optical observations
  83. GRB 140320B: ISON-NM optical observations
  84. Swift Trigger 592558 is not an astrophysical source
  85. GRB 140318A: Continued RATIR Optical and NIR Observations
  86. GRB 140318A: Mondy optical limit
  87. GRB 140318A: Swift/UVOT Upper Limits
  88. GRB 140311B: Mondy optical limit
  89. GRB 140311A: Mondy optical limits
  90. GRB 140318A: Enhanced Swift-XRT position
  91. GRB 140318A: RATIR Optical and NIR Detections
  92. GRB140318A: Discovery Channel Telescope Optical Detection
  93. GRB 140318A: NOT detection of the afterglow
  94. GRB 140318A: Swift detection of a burst
  95. GRB140308A: Suzaku WAM observation of the prompt emission
  96. GRB 140311C: MASTER optical observations
  97. GRB 140311C: Swift-XRT and UVOT observations
  98. GRB 140311C: MASTER before, during and after trigger optical observations
  99. GRB 140311B: Swift-BAT refined analysis
  100. GRB 140311A: RATIR Optical and NIR Detection

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