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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"

11528 results found.

  1. GRB 140906A - Fermi GBM Detection
  2. GRB 140906A: iPTF optical transient candidates
  3. GRB 140901B: Swift XRT observation
  4. GRB 140901B: Fermi GBM detection
  5. GRB 140901B found in ground analysis of BAT data
  6. GRB 140901A: Fermi GBM detection
  7. IPN Triangulation of GRB 140901A (short/hard/very intense)
  8. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  9. GRB 140829A: Fermi GBM Detection
  10. GRB 140829A: iPTF optical observations
  11. GRB 140828A: Fermi GBM observation
  12. IPN Triangulation of GRB 140824B
  13. GRB 140824B: Swift observations
  14. Fermi TRIGGER_NUM 430645968: MASTER OT inside error box
  15. GRB 140824B: Fermi GBM Detection
  16. GRB 140821A: Fermi GBM Detection
  17. Fermi TRIGGER_NUM 430583595: MASTER OT 20 hours later
  18. Fermi TRIGGER_NUM 430583595: MASTER OT JR011101.13+603337.5 detection
  19. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  20. Fermi trigger 430148973: Swift-XRT observation
  21. GRB 140808A/iPTF14eag: AMI 15 GHz detection
  22. GRB140819A: Deep GROND Upper Limits
  23. Fermi 430148973/MASTER candidate: LCO-Sutherland observations
  24. Fermi trigg_num 430148973: OSN I-band observations
  25. Fermi trigg_num 430148973: bright OT inside large error box!
  26. Konus-Wind observation of GRB 140818A
  27. GRB 140818B: Fermi GBM detection
  28. GRB 140818A - Fermi GBM Detection
  29. GRB 140818A: Correction to GCN 16702
  30. Konus-Wind observation of GRB 140817A
  31. GRB 140817A: Fermi GBM Detection
  32. GRB 140808A / PTFeag: VLA K-band observations
  33. IPN triangulation of GRB 140810A
  34. GRB 140808A: Confirmation of the Swift-XRT afterglow
  35. GRB140809A: Fermi GBM observation
  36. GRB 140810A: Fermi GBM observation
  37. Konus-Wind observation of GRB 140810A
  38. GRB140810A: Fermi-LAT detection
  39. Swift observations of possible GRB 140809A candidate
  40. GRB 140809A : Virtual Telescope optical observations
  41. GRB 140809A (FERMI trigger 429246673): MASTER follow-up inspection
  42. Konus-Wind observation of GRB 140808A
  43. GRB 140808A: Swift/UVOT Upper Limits
  44. GRB 140808A: Redshift from the 10.4m GTC telescope
  45. GRB 140808A: Swift-XRT observations
  46. GRB 140808A: Fermi GBM detection
  47. GRB 140808A: optical afterglow candidate iPTF14eag
  48. GRB 140801A: GROND Afterglow detection, unbroken decay
  49. GRB140801A: Swift/XRT further observations
  50. GRB 140801A: BTA confirmation of redshift
  51. GRB 140801A: Swift/UVOT Upper Limits
  52. GRB 140801A: Swift-XRT observations
  53. Konus-Wind observation of GRB 140801A
  54. GRB 140801A : Virtual Telescope optical observations
  55. GRB 140801A: Fermi GBM observation
  56. GRB 140801A: Redshift from the 10.4m GTC telescope
  57. GRB 140801A: NOT afterglow confirmation
  58. IPN triangulation of GRB 140801A (Fermi trigger 428612396)
  59. GRB 140801A: archival upper limits on the host galaxy
  60. GRB 140801A (FERMI trigger 428612396): MASTER brigth OT discovery
  61. Konus-Wind observation of GRB 140729A
  62. GRB 140729A: iPTF optical upper limit
  63. IPN Triangulation of GRB 140729A
  64. GRB 140729A: Fermi-GBM detection
  65. Correction to Fermi-LAT GCN Circular 16633
  66. GRB 140729A Tiled Swift observations
  67. GRB 140729A: Fermi-LAT detection
  68. GRB 140723A: MASTER optical observation
  69. Konus-Wind observation of GRB 140723A
  70. GRB 140723A: LCO-Sutherland optical candidate
  71. GRB 140723A: Fermi GBM detection
  72. IPN Triangulation of GRB 140723A
  73. GRB 140723A Tiled Swift observations
  74. GRB 140723A: Fermi-LAT detection
  75. Konus-Wind observation of GRB 140721A
  76. IPN Triangulation of GRB 140721A
  77. GRB 140721A: Fermi GBM detection
  78. Konus-Wind observation of GRB 140716A
  79. GRB 140716A: Swift-XRT detection of an afterglow candidate
  80. GRB 140716A: A Fermi GBM Detection
  81. GRB 140716A found in ground analysis of Swift-BAT data
  82. GRB 140714A: Fermi GBM detection
  83. GRB 140713A: Fermi GBM detection
  84. GRB 140710B: Fermi GBM detection
  85. Fermi GBM Observations of SGR 1935+2154
  86. GRB 140709B: Fermi GBM detection
  87. GRB 140709A: Fermi GBM detection
  88. Fermi GBM trigger 140708682 is not a GRB
  89. GRB 140706A: Fermi GBM detection
  90. GRB 140621A: Suzaku WAM observation of the prompt emission
  91. GRB 140703A: Fermi GBM detection
  92. Fermi 425667201: optical counterpart search
  93. GRB 140619B: Magellan near-infrared observations
  94. GRB 140623A: further Swift-XRT observations
  95. GRB 140619B: Suzaku WAM observation of the prompt emission
  96. GRB140606B/iPTF14bfu: Keck detection of an associated supernova
  97. GRB 140620A / iPTF14cva: TShAO optical observations
  98. GRB 140624A: Fermi GBM observation of a short burst
  99. GRB 140623A: Swift-XRT and UVOT observations
  100. GRB 140623A / iPTF14cyb: Fermi GBM detection

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