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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"

11532 results found.

  1. Fermi GBM trigger 140913075 is not a GRB
  2. GRB 140907A: MASTER optical observations
  3. GRB 140907A: Fermi GBM Detection
  4. GRB 140906B: Fermi GBM Detection of a Long GRB
  5. GRB 140906A - Fermi GBM Detection
  6. GRB 140906A: iPTF optical transient candidates
  7. GRB 140901B: Swift XRT observation
  8. GRB 140901B: Fermi GBM detection
  9. GRB 140901B found in ground analysis of BAT data
  10. GRB 140901A: Fermi GBM detection
  11. IPN Triangulation of GRB 140901A (short/hard/very intense)
  12. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  13. GRB 140829A: Fermi GBM Detection
  14. GRB 140829A: iPTF optical observations
  15. GRB 140828A: Fermi GBM observation
  16. IPN Triangulation of GRB 140824B
  17. GRB 140824B: Swift observations
  18. Fermi TRIGGER_NUM 430645968: MASTER OT inside error box
  19. GRB 140824B: Fermi GBM Detection
  20. GRB 140821A: Fermi GBM Detection
  21. Fermi TRIGGER_NUM 430583595: MASTER OT 20 hours later
  22. Fermi TRIGGER_NUM 430583595: MASTER OT JR011101.13+603337.5 detection
  23. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  24. Fermi trigger 430148973: Swift-XRT observation
  25. GRB 140808A/iPTF14eag: AMI 15 GHz detection
  26. GRB140819A: Deep GROND Upper Limits
  27. Fermi 430148973/MASTER candidate: LCO-Sutherland observations
  28. Fermi trigg_num 430148973: OSN I-band observations
  29. Fermi trigg_num 430148973: bright OT inside large error box!
  30. Konus-Wind observation of GRB 140818A
  31. GRB 140818B: Fermi GBM detection
  32. GRB 140818A - Fermi GBM Detection
  33. GRB 140818A: Correction to GCN 16702
  34. Konus-Wind observation of GRB 140817A
  35. GRB 140817A: Fermi GBM Detection
  36. GRB 140808A / PTFeag: VLA K-band observations
  37. IPN triangulation of GRB 140810A
  38. GRB 140808A: Confirmation of the Swift-XRT afterglow
  39. GRB140809A: Fermi GBM observation
  40. GRB 140810A: Fermi GBM observation
  41. Konus-Wind observation of GRB 140810A
  42. GRB140810A: Fermi-LAT detection
  43. Swift observations of possible GRB 140809A candidate
  44. GRB 140809A : Virtual Telescope optical observations
  45. GRB 140809A (FERMI trigger 429246673): MASTER follow-up inspection
  46. Konus-Wind observation of GRB 140808A
  47. GRB 140808A: Swift/UVOT Upper Limits
  48. GRB 140808A: Redshift from the 10.4m GTC telescope
  49. GRB 140808A: Swift-XRT observations
  50. GRB 140808A: Fermi GBM detection
  51. GRB 140808A: optical afterglow candidate iPTF14eag
  52. GRB 140801A: GROND Afterglow detection, unbroken decay
  53. GRB140801A: Swift/XRT further observations
  54. GRB 140801A: BTA confirmation of redshift
  55. GRB 140801A: Swift/UVOT Upper Limits
  56. GRB 140801A: Swift-XRT observations
  57. Konus-Wind observation of GRB 140801A
  58. GRB 140801A : Virtual Telescope optical observations
  59. GRB 140801A: Fermi GBM observation
  60. GRB 140801A: Redshift from the 10.4m GTC telescope
  61. GRB 140801A: NOT afterglow confirmation
  62. IPN triangulation of GRB 140801A (Fermi trigger 428612396)
  63. GRB 140801A: archival upper limits on the host galaxy
  64. GRB 140801A (FERMI trigger 428612396): MASTER brigth OT discovery
  65. Konus-Wind observation of GRB 140729A
  66. GRB 140729A: iPTF optical upper limit
  67. IPN Triangulation of GRB 140729A
  68. GRB 140729A: Fermi-GBM detection
  69. Correction to Fermi-LAT GCN Circular 16633
  70. GRB 140729A Tiled Swift observations
  71. GRB 140729A: Fermi-LAT detection
  72. GRB 140723A: MASTER optical observation
  73. Konus-Wind observation of GRB 140723A
  74. GRB 140723A: LCO-Sutherland optical candidate
  75. GRB 140723A: Fermi GBM detection
  76. IPN Triangulation of GRB 140723A
  77. GRB 140723A Tiled Swift observations
  78. GRB 140723A: Fermi-LAT detection
  79. Konus-Wind observation of GRB 140721A
  80. IPN Triangulation of GRB 140721A
  81. GRB 140721A: Fermi GBM detection
  82. Konus-Wind observation of GRB 140716A
  83. GRB 140716A: Swift-XRT detection of an afterglow candidate
  84. GRB 140716A: A Fermi GBM Detection
  85. GRB 140716A found in ground analysis of Swift-BAT data
  86. GRB 140714A: Fermi GBM detection
  87. GRB 140713A: Fermi GBM detection
  88. GRB 140710B: Fermi GBM detection
  89. Fermi GBM Observations of SGR 1935+2154
  90. GRB 140709B: Fermi GBM detection
  91. GRB 140709A: Fermi GBM detection
  92. Fermi GBM trigger 140708682 is not a GRB
  93. GRB 140706A: Fermi GBM detection
  94. GRB 140621A: Suzaku WAM observation of the prompt emission
  95. GRB 140703A: Fermi GBM detection
  96. Fermi 425667201: optical counterpart search
  97. GRB 140619B: Magellan near-infrared observations
  98. GRB 140623A: further Swift-XRT observations
  99. GRB 140619B: Suzaku WAM observation of the prompt emission
  100. GRB140606B/iPTF14bfu: Keck detection of an associated supernova

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