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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"

23463 results found.

  1. GRB 120913A: Swift detection of a burst
  2. GRB 120907A: optical observations of ISON-Kislovodsk
  3. GRB 120911A: optical upper limit CrAO
  4. GRB 120911A: optical upper limit ISON-NM
  5. GRB 120911B: Fermi-LAT detection of a burst
  6. IPN Triangulation of GRB 120911B (long/bright)
  7. GRB120911A: MITSuME Okayama Optical upper limits
  8. GRB 120911A: Fermi/LAT upper limit
  9. GRB 120911A: Swift/UVOT Upper Limits
  10. GRB 120911A: Enhanced Swift-XRT position
  11. GRB 120911A: Swift-XRT observations
  12. GRB 120911A: ROTSE-III Optical Limits
  13. GRB 120911A: Swift detection of a burst
  14. GRB 120907A: SMA upper limits
  15. GRB 120908A: Swift Observations
  16. GRB 120909A: TAROT La Silla observatory optical observations
  17. GRB 120909A: Pi of the Sky upper limits
  18. Konus-Wind observation of GRB 120909A
  19. GRB 120909A: Swift/UVOT Detection
  20. GRB 120909A: Enhanced Swift-XRT position
  21. GRB 120909A: GROND detection of the afterglow
  22. Skynet/PROMPT Observations of GRB120909A
  23. GRB 120909A: Swift detection of a burst
  24. GRB 120907A: Swift/UVOT Detection
  25. GRB 120907A: Enhanced Swift-XRT position
  26. GRB 120907A: Swift-BAT refined analysis
  27. GRB 120907A: NOT optical observations
  28. GRB 120907A: Swift detection of a burst with optical counterpart
  29. XMM observations of the short GRB120804A
  30. GRB 120819A: optical upper limit
  31. GRB 120802A: optical observations in CrAO
  32. GRB 120830A: Further Swift Observations
  33. GRB 120830A: Swift-XRT and UVOT observations
  34. GRB 120830A: early MASTER optical limit
  35. IPN Triangulation of short GRB 120830A
  36. Fermi trigger 368003226 : MASTER optical observations
  37. GRB 120819A: Swift/UVOT Upper Limits
  38. GRB 120817A: Swift/UVOT Upper Limits
  39. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  40. GRB 120821A: Swift/XRT observations
  41. GRB 120821A: Swift/UVOT Upper Limits
  42. GRB 120821A: GROND upper limits
  43. GRB 120817B - PTF Observations
  44. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  45. GRB 120811C: optical observations
  46. GRB 120819A: Bassano Bresciano Observatory optical observations
  47. GRB 120819A: GROND afterglow confirmation
  48. GRB 120819A: MITSuME Ishigakijima upper limits
  49. GRB 120819A: MITSuME Okayama Optical upper limits
  50. GRB 120819A: Enhanced Swift-XRT position
  51. GRB 120819A: afterglow candidate from NOT
  52. GRB 120819A: Swift detection of a burst
  53. GRB 120817B: Swift-XRT observations
  54. GRB 120811C: optical observations
  55. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  56. GRB 120815A: MASTER-ICATE observations
  57. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  58. GRB 120817B: LCO Optical Observations
  59. IPN Triangulation of GRB 120817B (short/very intense)
  60. GRB 120816A: optical upper limit
  61. GRB 120817A: Enhanced Swift-XRT position
  62. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  63. GRB 120816A: Bassano Bresciano Observatory optical observations
  64. GRB 120817A: Swift-XRT observations
  65. GRB 120817A: Swift detection of a burst
  66. GRB 120816A: Enhanced Swift-XRT position
  67. GRB 120816A: BOOTES-2 observations
  68. GRB120816A: OPTIMA discovery of optical counterpart
  69. GRB 120816A: TAROT Calern observatory optical observations
  70. GRB 120816A: ROTSE-III Optical Limits
  71. GRB 120816A: Swift detection of a burst
  72. GRB 120815A: Enhanced Swift-XRT position
  73. GRB 120815A: VLT/X-shooter redshift
  74. GRB 120815A: GROND afterglow candidate
  75. GRB 120815A: Swift-XRT observations
  76. GRB 120815A: TAROT La Silla observatory optical observations
  77. GRB 120815A: Swift detection of a burst
  78. GCN for GRB 120811C
  79. GRB 120811A: Swift/XRT-UVOT Obseravations
  80. GRB120804A: Chandra observations and afterglow detection
  81. GRB 120805A: optical afterglow confirmation from the NOT
  82. GRB 120805A: Enhanced Swift-XRT position
  83. GRB 120811C: RTT150 optical observations
  84. GRB 120811C: MASTER-Tunka OT observations
  85. GRB 120811C: Bassano Bresciano Observatory optical observations
  86. GRB 120811C: Swift/UVOT Detection
  87. Improved IPN error box for short hard GRB 120811B
  88. GRB 120811C: RTT150 optical observations
  89. GRB 120811C: Enhanced Swift-XRT position
  90. GRB 120811C: TAROT Calern observatory optical observations
  91. GRB 120811C: Swift detection of a burst with an optical counterpart
  92. IPN Triangulation of short hard GRB 120811B
  93. Trigger 530588: Swift detection of XMM J174457-2850.3
  94. Swift Trigger 530581: GRB 120811A or a galactic transient
  95. GRB 120803A: optical upper limit
  96. GRB 120807A: Swift/UVOT Upper Limits
  97. GRB 120803A: Confirmation of the X-ray afterglow
  98. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  99. GRB 120714B: GROND/FORS2 detection of a supernova
  100. Swift Trigger 530441 is a false trigger

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