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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"

19689 results found.

  1. GRB 140628A: Zadko observatory - Gingin optical observations
  2. GRB 140628A: Swift/UVOT Detection
  3. GRB 140628A: Swift/UVOT Detection
  4. GRB 140628A: Swift-XRT afterglow detection and enhanced position
  5. GRB 140626A: TAROT La Silla observatory optical observations
  6. GRB 140622A: TAROT La Silla observatory optical observations
  7. GRB 140628A: Swift detection of a burst
  8. GRB 140619B: Magellan near-infrared observations
  9. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  10. Swift Trigger 602668 is probably not an astrophysical source
  11. GRB 140626A: Swift/UVOT Upper Limits
  12. GRB 140626A: Enhanced Swift-XRT position
  13. GRB 140626A: GROND Afterglow Candidate
  14. GRB 140626A: Swift detection of a burst
  15. GRB 140623A: Swift-XRT and UVOT observations
  16. GRB 140621A: Swift-XRT observations
  17. GRB 140622A: iTelescope.Net T11 Optical Observation
  18. GRB 140622A: Swift/UVOT Upper Limits
  19. IPN Triangulation of GRB 140621A
  20. GRB 140620A / iPTF14cva: Konkoly optical observations
  21. GRB 140622A: An unusual short event, Swift-BAT refined analysis
  22. GRB 140622A: VLT/X-shooter redshift
  23. GRB 140622A: RATIR Optical and NIR Observations
  24. GRB 140622A: GROND Upper limits
  25. GRB 140622A: Enhanced Swift-XRT position
  26. GRB 140622A: Swift detection of a short burst
  27. GRB 140620A: Swift/UVOT Detection
  28. GRB 140606B / iPTF 14bfu: SAO RAS optical observations
  29. GRB 140620A: Swift-XRT observations
  30. GRB 140610A: TShAO optical upper limit
  31. GRB 140619A: Swift/UVOT Observations
  32. GRB 140619A: Enhanced Swift-XRT position
  33. GRB 140619A: Swift detection of a burst with a possible optical counterpart
  34. Swift-BAT trigger 601928: Detection of a possible outburst from V490 Cep
  35. GRB 140606B: Swift XRT final light curve
  36. GRB 140606A: BTA and OSN optical observations
  37. GRB 140614B: MOSFIRE Ks-band nondetection
  38. GRB 140614B: MITSuME Akeno upper limits
  39. GRB 140614B: MITSuME Okayama upper limits
  40. GRB 140606B / iPTF 14bfu: Mondy optical observations
  41. GRB 140614B: Swift/UVOT Upper Limits
  42. GRB 140614B: RATIR Optical and NIR Observations
  43. GRB 140606B / iPTF 14bfu: AAO optical observations
  44. GRB 140614A: Swift/UVOT Upper Limits
  45. GRB 140614B: Enhanced Swift-XRT position
  46. GRB 140614B: Swift detection of a burst
  47. GRB 140614A: Enhanced Swift-XRT position
  48. GRB 140614A: GROND afterglow candidate
  49. GRB 140614A: Swift detection of a burst
  50. GRB 140610A: Swift-XRT refined Analysis
  51. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  52. GRB 140611A Detection of a source in BAT ground analysis
  53. IPN Triangulation of GRB 140611A (short/hard)
  54. GRB 140610A: RATIR Optical and NIR Observations
  55. GRB 140610A: Swift/UVOT Upper Limits
  56. GRB 140610A: Swift-XRT observations
  57. Konus-Wind observation of GRB 140606B
  58. GRB 140606B: Swift XRT refined analysis
  59. GRB 140521A: AAO optical upper limit
  60. GRB 140606A: AAO optical upper limit
  61. GRB 140606B: Swift/UVOT Upper Limits
  62. GRB140606B/iPTF14bfu: Discovery Channel Telescope Optical Detection
  63. GRB 140606B: Swift XRT position
  64. GRB 140606A: Nanshan optical upper limit
  65. GRB 140606A: Swift/UVOT Upper Limits
  66. GRB 140606A: Swift-XRT upper limits
  67. GRB 140606A: Swift-BAT refined analysis
  68. GRB 140606A: Swift detection of a short hard burst
  69. GRB 140523A: further Swift-XRT observations
  70. GRB 140529A: Swift/UVOT Upper Limits
  71. GRB 140529A: Swift-XRT afterglow detection.
  72. GRB 140408A: Withdrawal of afterglow candidate
  73. Swift trigger 600114 is not an outbursting X-ray source
  74. Swift detection of a bright X-ray source in M31
  75. Swift detection of SFXT IGR J17544-2619
  76. GRB 140523A: NOT observation
  77. IPN Triangulation of GRB 140523A
  78. GRB 140523A: Nanshan optical upper limit
  79. Swift trigger 599860 probably not real
  80. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  81. GRB 140423A: TShAO optical observations
  82. GRB 140521A: AAO optical observations
  83. GRB 140521A: AROMA-N Optical Observation
  84. GRB 140521A: MITSuME Okayama upper limits
  85. GRB 140516A: further Swift-XRT analysis
  86. GRB 140518A: T100 observations
  87. GRB 140518A: Continued RATIR Optical and NIR Observations
  88. GRB 140512A: MASTER prompt and afterglow optical observations
  89. GRB 140518A, Swift-BAT refined analysis
  90. GRB 140518A: Swift-XRT refined Analysis
  91. GRB 140518A: Skynet GORT Detections of the Optical Afterglow
  92. GRB 140518A: Swift/UVOT Upper Limits
  93. GRB 140518A: RATIR Optical and NIR Observations
  94. GRB 140518A: Gemini-N redshift
  95. GRB 140518A: Swift detection of a burst
  96. GRB 140516A: RATIR Optical and NIR Observations
  97. GRB 140516A: Subaru NIR imaging observations
  98. GRB 140516A: 6 GHz upper limit
  99. GRB 140516A: Gemini-North limit on an optical afterglow
  100. GRB 140516A: Swift/UVOT Upper Limits

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