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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"

28235 results found.

  1. Fermi trigger 430148973: Swift-XRT observation
  2. GRB 140818A: GROND confirmation of afterglow candidate
  3. GRB140819A: Deep GROND Upper Limits
  4. Fermi 430148973/MASTER candidate: LCO-Sutherland observations
  5. Fermi trigg_num 430148973: OSN I-band observations
  6. GRB 140818B, Swift-BAT refined analysis
  7. Fermi trigg_num 430148973: bright OT inside large error box!
  8. GRB 140818B: Swift/UVOT Upper Limits
  9. GRB 140818B: Swift-XRT refined Analysis
  10. GRB 140818B: Fermi GBM detection
  11. GRB140818B : GROND afterglow candidate
  12. GRB 140818B: Enhanced Swift-XRT position
  13. GRB 140818B: OSN I-band afterglow candidate
  14. GRB 140817A: Swift/UVOT Afterglow Detection
  15. GRB 140818B: Swift detection of a burst
  16. Swift detection of SAX J1712.6-3739
  17. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  18. GRB 140818A: MAXI/GSC detection
  19. GRB 140817A: Swift-XRT refined Analysis
  20. GRB 140817A: Swift-BAT refined analysis
  21. GRB 140817A: Enhanced Swift-XRT position
  22. GRB 140817A: Swift detection of a burst
  23. GRB 140815A: GROND afterglow candidate
  24. Swift Trigger 609694 is probably not an astrophysical source
  25. GRB 140815A: Swift-XRT observations
  26. GRB 140815A: A long GRB detected by INTEGRAL
  27. GRB 140814A: Swift-XRT and UVOT observations
  28. GRB 140814A: MASTER optical follow-up inspection
  29. GRB 140814A: Swift-XRT and UVOT observations
  30. GRB 140814A: MAXI/GSC detection
  31. GRB 140808A: Confirmation of the Swift-XRT afterglow
  32. GRB140810A: Fermi-LAT detection
  33. Swift trigger 609139 is probably 4U 1850-03
  34. Swift observations of possible GRB 140809A candidate
  35. GRB 140809A : Virtual Telescope optical observations
  36. GRB 140808A: Swift/UVOT Upper Limits
  37. GRB 140808A: Swift-XRT observations
  38. GRB 140808A: optical afterglow candidate iPTF14eag
  39. GRB 140801A: AAO optical observations
  40. GRB 140801A: GROND Afterglow detection, unbroken decay
  41. GRB140801A: Swift/XRT further observations
  42. GRB 140730A: GROND Upper limits
  43. GRB 140801A: BTA confirmation of redshift
  44. GRB 140801A: Swift/UVOT Upper Limits
  45. GRB 140801A: Swift-XRT observations
  46. GRB 140801A : Virtual Telescope optical observations
  47. GRB 140801A: Fermi GBM observation
  48. GRB 140801A: NOT afterglow confirmation
  49. GRB 140730A, Swift-BAT refined analysis
  50. GRB 140709B: TShAO optical upper limit
  51. GRB 140709A, the review of the sky area in plate archives
  52. Swift Trigger 607945: possible noise event in the direction of NGC2559
  53. GRB 140730A: LCO-Sutherland observations
  54. GRB 140730A: Swift-XRT refined Analysis
  55. GRB 140730A: Swift/UVOT Upper Limits
  56. GRB 140730A: Enhanced Swift-XRT position
  57. GRB 140730A: Swift detection of a burst
  58. GRB 140729A: iPTF optical upper limit
  59. Swift Trigger 607506 is probably noise
  60. GRB 140729A: Swift-XRT and UVOT observations
  61. IPN Triangulation of GRB 140729A
  62. GRB 140729A: Fermi-GBM detection
  63. Correction to Fermi-LAT GCN Circular 16633
  64. GRB 140729A: Fermi-LAT detection
  65. Trigger 607399: Swift detection of SGR1806-20
  66. GRB 140723A: Swift-XRT and UVOT observations
  67. GRB 140723A: LCO-Sutherland optical candidate retraction
  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. GRB 140709B: Swift/UVOT Upper Limits
  76. GRB 140719B: Swift XRT observation
  77. GRB 140719A: Swift/UVOT Upper Limits
  78. GRB 140721A: Fermi GBM detection
  79. GRB 140716A: Confirmation of the Swift-XRT afterglow
  80. GRB 140719B, Swift-BAT refined analysis
  81. GRB 140716A: GROND confirmation of the afterglow
  82. GRB 140719A, Swift-BAT refined analysis
  83. GRB 140719A: GROND Afterglow candidate
  84. GRB 140719B: Zadko observatory - Gingin optical observations
  85. GRB 140719A: Swift-XRT refined Analysis
  86. GRB 140719A: Enhanced Swift-XRT position
  87. GRB 140719A: Swift detection of a burst
  88. Konus-Wind observation of GRB 140716A
  89. GRB 140716A: Swift/UVOT Upper Limits
  90. GRB 140713A: AMI 15 GHz detection
  91. GRB 140713A: 10.4-m GTC deep optical observation
  92. GRB 140716A: GROND afterglow candidate
  93. GRB 140716A: Swift-XRT detection of an afterglow candidate
  94. GRB 140716A BAT refined analysis
  95. Swift observations of a flare from UX Ari
  96. GRB 140709A: Possible AMI 15 GHz detection
  97. Swift detection of UX Ari
  98. GRB 140714A: Fermi GBM detection
  99. GRB 140713A: Swift-XRT refined Analysis
  100. GRB 140713A: Swift/UVOT Upper Limits

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