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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20967 results found.

  1. GRB 140430A: VLT/X-shooter redshift
  2. GRB 140430A: NOT optical observations
  3. GRB 140430A : Liverpool Telescope optical afterglow observations
  4. GRB 140428A: GROND observations
  5. GRB 140428A: Swift/UVOT Upper Limits
  6. GRB 140423A: RTT150 optical observations
  7. GRB 140428A: Keck detection of a red optical afterglow candidate
  8. GRB 140428A: NOT observations
  9. GRB 140423A Third epoch pODI photometry
  10. GRB 140423A: Continued RATIR Optical and NIR Observations
  11. GRB 140413A: GROND Afterglow Confirmation
  12. DG CVn: optical observations
  13. GRB 140423A: RATIR Optical and NIR Observations
  14. GRB 140423A: NOT Afterglow Observations
  15. GRB 140419A: Continued Mondy optical observations
  16. GRB 140423A: Nishi-Harima NIR Observations
  17. GRB 140423A: TNG NIR observations
  18. GRB 140423A pODI/WIYN afterglow photometry
  19. GRB 140423A, Optical Observations
  20. GRB 140423A: Kanata/HONIR Optical and NIR Observations
  21. GRB 140423A: Further Observations with Swift/UVOT
  22. GRB 140423A: KAIT Optical Detection
  23. GRB 140423A: P60 Observations
  24. GRB 140423A: Gemini-N redshift
  25. GRB 140419A, LOAO R-band observations
  26. GRB 140423A: Swift-XRT observations
  27. GRB 140423A: ROTSE-III Detection of Optical Counterpart
  28. GRB 140423A optical observations with pODI/WIYN at KPNO
  29. GRB 140419A: Mondy optical observations
  30. GRB 140419A: Refined NOT photometry
  31. GRB 140419A: Continued RATIR Optical and NIR Observations
  32. GRB140419A: NOT optical observations
  33. GRB 140419A: KAIT Refined Analysis
  34. GRB 140419A: Continued RATIR Optical and NIR Observations
  35. GRB 140419A, Optical Observations
  36. GRB 140419A: Swift UVOT refined analysis
  37. GRB 140419A: P60 Observations
  38. GRB 140419A: T24 optical observations
  39. GRB 140419A: Gemini-N redshift
  40. GRB 140419A: CARMA early 3mm detection
  41. GRB 140419A: RATIR Optical and NIR Observations
  42. GRB 140419A: ROTSE-III Detection of Optical Counterpart
  43. GRB 140419A (Swift trigger 596426) : KAIT optical candidate
  44. GRB 140414A: Swift-XRT observations
  45. GRB 140414A: TNG optical observations
  46. GRB 140413A: Swift/UVOT Observations of the Optical Afterglow
  47. GRB 140412A: Swift/UVOT Upper Limits
  48. GRB 140413A: TAROT La Silla observatory optical observations
  49. GRB 140413A: Swift-XRT observations
  50. GRB 140413A: GROND afterglow candidate
  51. Swift-BAT trigger 595162 is noise
  52. Fermi418277210: iPTF optical observations
  53. GRB 140408A: GROND Detection of an Afterglow Candidate
  54. GRB 140408A: Swift/UVOT Upper Limits
  55. GRB 140402A: Deep limit on the optical afterglow from Magellan observations
  56. GRB 111225A: Archeological redshift of the Christmas Burst 2011 from GTC
  57. GRB 140331A: Continued RATIR Optical and NIR Observations
  58. GRB 140402A: Swift-XRT observations
  59. GRB 140402A: MASTER optical observations
  60. GRB 140301A: Zadko observatory - Gingin optical observations
  61. Retraction of the Fermi/LAT high-energy counterpart for GRB 140330A
  62. GRB 140331A: Swift/UVOT Upper Limits
  63. GRB 140302A: TAROT La Silla observatory optical observations
  64. GRB 140323A: Zadko observatory - Gingin optical observations
  65. GRB 140331A: Zadko observatory - Gingin optical observations
  66. GRB 140129A: Mondy optical observations
  67. GRB 140331A: RATIR Optical and NIR Observations
  68. GRB 140320D: MASTER optical observations
  69. GRB 140226A/iPTF14yb: Mondy optical observations
  70. GRB 140320C: Mondy optical observations and afterglow confirmation
  71. GRB 140323A: Swift/UVOT Upper Limits
  72. GRB 140320A: RATIR Optical and NIR Observations
  73. GRB 140320B: P60 detection of a very red afterglow
  74. GRB 140320C: Swift/UVOT Upper Limits
  75. GRB 140320B: Swift/UVOT Upper Limits
  76. GRB 140320A: Swift/UVOT Upper Limits
  77. GRB 140320C: Swift-XRT observations
  78. GRB 140320C: Mondy optical observations
  79. GRB 140320C: MASTER optical observations
  80. GRB 140320C: FTN optical observations
  81. GRB 140320B: ISON-NM optical observations
  82. GRB 140320A: Fermi GBM observations suggest a short GRB
  83. GRB 140318A: Continued RATIR Optical and NIR Observations
  84. GRB 140318A: Swift/UVOT Upper Limits
  85. GRB 140318A: Liverpool Telescope optical observations
  86. GRB 140318A: RATIR Optical and NIR Detections
  87. GRB140318A: Discovery Channel Telescope Optical Detection
  88. GRB 140318A: NOT detection of the afterglow
  89. GRB 140311A: VLA Detection
  90. GRB 140311C: MASTER optical observations
  91. GRB 140311C: Swift-XRT and UVOT observations
  92. GRB 140311C: MASTER before, during and after trigger optical observations
  93. GRB 140311A: further NOT observations
  94. GRB 140311A: RATIR Optical and NIR Detection
  95. GRB 140311A: Montarrenti Observatory optical upper limit
  96. GRB 140311A: Swift/UVOT Upper Limits
  97. GRB 140311B: Swift/UVOT Upper Limits
  98. Fermi416242156: possible iPTF counterpart
  99. GRB 140311B: RATIR Optical and NIR Observations
  100. GRB 140311A: Bassano Bresciano Observatory optical upper limit

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