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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"

28301 results found.

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

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