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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"

27394 results found.

  1. GRB 140614B: RATIR Optical and NIR Observations
  2. GRB 140606B / iPTF 14bfu: AAO optical observations
  3. GRB 140614A: Swift/UVOT Upper Limits
  4. GRB 140614A: Swift-XRT refined Analysis
  5. GRB 140614B: Enhanced Swift-XRT position
  6. GRB 140614B: Swift detection of a burst
  7. GRB 140614A: Enhanced Swift-XRT position
  8. GRB 140614A: GROND afterglow candidate
  9. GRB 140614A: Swift detection of a burst
  10. GRB 140611A: Swift-XRT observations
  11. GRB 140610A: Swift-XRT refined Analysis
  12. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  13. GRB 140611A Detection of a source in BAT ground analysis
  14. IPN Triangulation of GRB 140611A (short/hard)
  15. GRB 140610A: RATIR Optical and NIR Observations
  16. GRB 140610A: Swift-BAT refined analysis
  17. GRB 140610A: MASTER optical observations
  18. GRB 140610A: Swift/UVOT Upper Limits
  19. Konus-Wind observation of GRB 140610A
  20. GRB 140610A: Swift-XRT observations
  21. GRB 140606B: Swift XRT refined analysis
  22. GRB 140521A: AAO optical upper limit
  23. GRB 140606A: AAO optical upper limit
  24. GRB 140607A: Swift-BAT refined analysis
  25. GRB 140606B: Swift/UVOT Upper Limits
  26. GRB140606B/iPTF14bfu: Discovery Channel Telescope Optical Detection
  27. GRB 140606B: Swift XRT position
  28. GRB 140606B: Fermi GBM detection
  29. Fermi423717114: iPTF optical transient candidates
  30. GRB 140606A: Nanshan optical upper limit
  31. GRB 140606A: Swift/UVOT Upper Limits
  32. GRB 140606A: Swift-XRT upper limits
  33. Swift XRT status update
  34. GRB 140606A: Swift-BAT refined analysis
  35. GRB 140606A: Swift detection of a short hard burst
  36. GRB 140523A: further Swift-XRT observations
  37. GRB 140529A BAT refined analysis
  38. Konus-Wind observation of GRB 140529A
  39. GRB 140529A: Swift/UVOT Upper Limits
  40. GRB 140529A: Swift-XRT afterglow detection.
  41. GRB 140408A: Withdrawal of afterglow candidate
  42. Swift trigger 600114 is not an outbursting X-ray source
  43. Swift Trigger 600114: Preliminary BAT analysis
  44. Swift detection of a bright X-ray source in M31
  45. Swift detection of SFXT IGR J17544-2619
  46. GRB 140523A: NOT observation
  47. IPN Triangulation of GRB 140523A
  48. GRB 140523A: Nanshan optical upper limit
  49. Swift trigger 599860 probably not real
  50. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  51. GRB 140523A: Fermi-LAT detection
  52. GRB 140523A: Fermi GBM detection
  53. GRB 140521A: AAO optical observations
  54. GRB 140521A: Swift-BAT refined analysis
  55. GRB 140521A: AROMA-N Optical Observation
  56. GRB 140521A: MITSuME Okayama upper limits
  57. GRB 140516A: further Swift-XRT analysis
  58. GRB 140521A: MASTER optical observations
  59. GRB 140518A: T100 observations
  60. GRB 140518A: Continued RATIR Optical and NIR Observations
  61. GRB 140512A: MASTER prompt and afterglow optical observations
  62. GRB 140518A, Swift-BAT refined analysis
  63. GRB 140518A: Swift-XRT refined Analysis
  64. GRB 140518A: Skynet GORT Detections of the Optical Afterglow
  65. GRB 140518A: Swift/UVOT Upper Limits
  66. GRB 140518A: RATIR Optical and NIR Observations
  67. GRB 140518A: KAIT optical candidate
  68. GRB 140518A: Swift detection of a burst
  69. GRB 140516A: RATIR Optical and NIR Observations
  70. GRB 140516A: Subaru NIR imaging observations
  71. GRB 140516A: 6 GHz upper limit
  72. GRB 140516A: Swift/UVOT Upper Limits
  73. GRB 140516A: Swift-BAT refined analysis
  74. GRB 140516A: Swift-XRT refined Analysis
  75. GRB 140516A: NOT optical observations
  76. GRB 140516A: Enhanced Swift-XRT position
  77. GRB 140516A: MASTER early optical observations
  78. GRB 140516A: ISON-Kislovodsk optical observations
  79. GRB 140516A: TNG optical observations
  80. GRB 140516A: Swift detection of a short burst
  81. GRB 140515A: Swift-BAT refined analysis
  82. GRB 140515A : TNG near-infrared observations
  83. GRB 140515A: GROND observation of the afterglow
  84. GRB 140515A: Swift-XRT refined Analysis
  85. GRB 140515B: MAXI/GSC detection
  86. GRB 140515A: Swift/UVOT Upper Limits
  87. GRB 140515A: MITSuME Akeno upper limits
  88. GRB 140515A: Enhanced Swift-XRT position
  89. GRB 140515A: Gemini-N redshift
  90. GRB 140515A: Swift detection of a burst
  91. GRB 140512A: Continued UVOT Observations
  92. GRB 140508A: Mondy upper limit
  93. GRB 140508A: MITSuME Akeno Optical observation
  94. GRB 140512A: Swift-BAT refined analysis
  95. GRB140512A : GROND observations
  96. GRB 140512A: Swift-XRT refined Analysis
  97. GRB 140512A: Enhanced Swift-XRT position
  98. Swift Observations of GRB 140508A
  99. GRB 140512A: Optical observations from the 2.5 m NOT
  100. GRB 140428A: GROND afterglow confirmation

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