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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"

11546 results found.

  1. GRB 140928A: Swift-XRT follow-up observations
  2. GRB 140928A: MAXI-GSC detection
  3. GRB140928A: Gemini-South observation
  4. Konus-Wind observation of GRB 140928A
  5. GRB 140928A: LCO-Cerro Tololo further observations
  6. IPN Triangulation of GRB 140928A
  7. GRB 140928A: LCO-Cerro Tololo observations
  8. GRB 140928A: Fermi GBM detection
  9. GRB 140928A: GROND Afterglow Candidate
  10. GRB 140928A: Swift-XRT observations
  11. GRB 140928A: Fermi-LAT detection
  12. GRB 140919A: Fermi GBM observation
  13. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  14. GRB 140916B: iPTF Optical Observations
  15. Fermi GBM trigger 140913075 is not a GRB
  16. GRB 140907A: MASTER optical observations
  17. GRB 140907A: Fermi GBM Detection
  18. GRB 140906B: Fermi GBM Detection of a Long GRB
  19. GRB 140906A - Fermi GBM Detection
  20. GRB 140906A: iPTF optical transient candidates
  21. GRB 140901B: Swift XRT observation
  22. GRB 140901B: Fermi GBM detection
  23. GRB 140901B found in ground analysis of BAT data
  24. GRB 140901A: Fermi GBM detection
  25. IPN Triangulation of GRB 140901A (short/hard/very intense)
  26. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  27. GRB 140829A: Fermi GBM Detection
  28. GRB 140829A: iPTF optical observations
  29. GRB 140828A: Fermi GBM observation
  30. IPN Triangulation of GRB 140824B
  31. GRB 140824B: Swift observations
  32. Fermi TRIGGER_NUM 430645968: MASTER OT inside error box
  33. GRB 140824B: Fermi GBM Detection
  34. GRB 140821A: Fermi GBM Detection
  35. Fermi TRIGGER_NUM 430583595: MASTER OT 20 hours later
  36. Fermi TRIGGER_NUM 430583595: MASTER OT JR011101.13+603337.5 detection
  37. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  38. Fermi trigger 430148973: Swift-XRT observation
  39. GRB 140808A/iPTF14eag: AMI 15 GHz detection
  40. GRB140819A: Deep GROND Upper Limits
  41. Fermi 430148973/MASTER candidate: LCO-Sutherland observations
  42. Fermi trigg_num 430148973: OSN I-band observations
  43. Fermi trigg_num 430148973: bright OT inside large error box!
  44. Konus-Wind observation of GRB 140818A
  45. GRB 140818B: Fermi GBM detection
  46. GRB 140818A - Fermi GBM Detection
  47. GRB 140818A: Correction to GCN 16702
  48. Konus-Wind observation of GRB 140817A
  49. GRB 140817A: Fermi GBM Detection
  50. GRB 140808A / PTFeag: VLA K-band observations
  51. IPN triangulation of GRB 140810A
  52. GRB 140808A: Confirmation of the Swift-XRT afterglow
  53. GRB140809A: Fermi GBM observation
  54. GRB 140810A: Fermi GBM observation
  55. Konus-Wind observation of GRB 140810A
  56. GRB140810A: Fermi-LAT detection
  57. Swift observations of possible GRB 140809A candidate
  58. GRB 140809A : Virtual Telescope optical observations
  59. GRB 140809A (FERMI trigger 429246673): MASTER follow-up inspection
  60. Konus-Wind observation of GRB 140808A
  61. GRB 140808A: Swift/UVOT Upper Limits
  62. GRB 140808A: Redshift from the 10.4m GTC telescope
  63. GRB 140808A: Swift-XRT observations
  64. GRB 140808A: Fermi GBM detection
  65. GRB 140808A: optical afterglow candidate iPTF14eag
  66. GRB 140801A: GROND Afterglow detection, unbroken decay
  67. GRB140801A: Swift/XRT further observations
  68. GRB 140801A: BTA confirmation of redshift
  69. GRB 140801A: Swift/UVOT Upper Limits
  70. GRB 140801A: Swift-XRT observations
  71. Konus-Wind observation of GRB 140801A
  72. GRB 140801A : Virtual Telescope optical observations
  73. GRB 140801A: Fermi GBM observation
  74. GRB 140801A: Redshift from the 10.4m GTC telescope
  75. GRB 140801A: NOT afterglow confirmation
  76. IPN triangulation of GRB 140801A (Fermi trigger 428612396)
  77. GRB 140801A: archival upper limits on the host galaxy
  78. GRB 140801A (FERMI trigger 428612396): MASTER brigth OT discovery
  79. Konus-Wind observation of GRB 140729A
  80. GRB 140729A: iPTF optical upper limit
  81. IPN Triangulation of GRB 140729A
  82. GRB 140729A: Fermi-GBM detection
  83. Correction to Fermi-LAT GCN Circular 16633
  84. GRB 140729A Tiled Swift observations
  85. GRB 140729A: Fermi-LAT detection
  86. GRB 140723A: MASTER optical observation
  87. Konus-Wind observation of GRB 140723A
  88. GRB 140723A: LCO-Sutherland optical candidate
  89. GRB 140723A: Fermi GBM detection
  90. IPN Triangulation of GRB 140723A
  91. GRB 140723A Tiled Swift observations
  92. GRB 140723A: Fermi-LAT detection
  93. Konus-Wind observation of GRB 140721A
  94. IPN Triangulation of GRB 140721A
  95. GRB 140721A: Fermi GBM detection
  96. Konus-Wind observation of GRB 140716A
  97. GRB 140716A: Swift-XRT detection of an afterglow candidate
  98. GRB 140716A: A Fermi GBM Detection
  99. GRB 140716A found in ground analysis of Swift-BAT data
  100. GRB 140714A: Fermi GBM detection

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