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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"

20513 results found.

  1. GRB 120911B: Fermi GBM observation
  2. GRB 120911B: Fermi-LAT detection of a burst
  3. GRB120911A: MITSuME Okayama Optical upper limits
  4. GRB 120911A: Fermi/LAT upper limit
  5. GRB 120911A: Swift/UVOT Upper Limits
  6. GRB 120911A: Swift-BAT refined analysis
  7. GRB 120911A: Enhanced Swift-XRT position
  8. GRB 120911A: Swift-XRT observations
  9. GRB 120911A: ROTSE-III Optical Limits
  10. GRB 120908A: Fermi GBM detection
  11. GRB 120908A: Swift Observations
  12. GRB 120909A: TAROT La Silla observatory optical observations
  13. GRB 120909A: Pi of the Sky upper limits
  14. GRB 120909A: Swift/UVOT Detection
  15. GRB 120909A: Enhanced Swift-XRT position
  16. GRB 120908A: MAXI/GSC detection
  17. GRB 120909A: GROND detection of the afterglow
  18. Skynet/PROMPT Observations of GRB120909A
  19. GRB 120909A: Swift detection of a burst
  20. GRB 120907A: Swift/UVOT Detection
  21. GRB 120907A: Enhanced Swift-XRT position
  22. GRB 120907A: NOT optical observations
  23. GRB 120907A: Swift detection of a burst with optical counterpart
  24. XMM observations of the short GRB120804A
  25. GRB 120802A: optical observations in CrAO
  26. GRB 120830A: Further Swift Observations
  27. GRB 120830A: Swift-XRT and UVOT observations
  28. GRB 120830A: early MASTER optical limit
  29. GRB 120830A: Fermi-LAT detection of a short burst
  30. Fermi trigger 368003226 : MASTER optical observations
  31. GRB 120819A: Swift/UVOT Upper Limits
  32. GRB 120817A: Swift/UVOT Upper Limits
  33. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  34. GRB 120821A: Swift/UVOT Upper Limits
  35. GRB 120821A: GROND upper limits
  36. GRB 120817B - PTF Observations
  37. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  38. GRB 120811C: optical observations
  39. GRB 120819A: Bassano Bresciano Observatory optical observations
  40. GRB 120819A: GROND afterglow confirmation
  41. GRB 120819A: MITSuME Ishigakijima upper limits
  42. GRB 120819A: MITSuME Okayama Optical upper limits
  43. GRB 120819A: Enhanced Swift-XRT position
  44. GRB 120819A: afterglow candidate from NOT
  45. GRB 120819A: Swift detection of a burst
  46. GRB 120811C: optical observations
  47. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  48. GRB 120815A: MASTER-ICATE observations
  49. Konus-Wind observation of GRB 120816B
  50. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  51. Konus-Wind observation of GRB 120817B
  52. GRB 120817B: LCO Optical Observations
  53. GRB 120816A: optical upper limit
  54. GRB 120817A: Enhanced Swift-XRT position
  55. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  56. GRB 120816A: Bassano Bresciano Observatory optical observations
  57. GRB 120817A: Swift-XRT observations
  58. GRB 120816A: Enhanced Swift-XRT position
  59. GRB 120816A: BOOTES-2 observations
  60. GRB120816A: OPTIMA discovery of optical counterpart
  61. GRB 120816A: TAROT Calern observatory optical observations
  62. GRB 120816A: ROTSE-III Optical Limits
  63. GRB 120816A: Swift detection of a burst
  64. GRB 120815A: Enhanced Swift-XRT position
  65. GRB 120815A: VLT/X-shooter redshift
  66. GRB 120815A: GROND afterglow candidate
  67. GRB 120815A: Swift-XRT observations
  68. GRB 120815A: TAROT La Silla observatory optical observations
  69. GRB 120804A: Possible temporal break in the X-ray light-curve
  70. GRB 120811A: Swift/XRT-UVOT Obseravations
  71. GRB120804A: Chandra observations and afterglow detection
  72. GRB 120805A: optical afterglow confirmation from the NOT
  73. GRB 120805A: Enhanced Swift-XRT position
  74. GRB 120811C: RTT150 optical observations
  75. GRB 120811C: Bassano Bresciano Observatory optical observations
  76. GRB 120811C: Swift/UVOT Detection
  77. GRB 120811C: RTT150 optical observations
  78. GRB 120811C: Enhanced Swift-XRT position
  79. GRB 120811C: TAROT Calern observatory optical observations
  80. GRB 120811C: Swift detection of a burst with an optical counterpart
  81. Trigger 530588: Swift detection of XMM J174457-2850.3
  82. GRB 120803A: optical upper limit
  83. GRB 120807A: Swift/UVOT Upper Limits
  84. GRB 120802A: optical observations
  85. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  86. GRB 120807A: TAROT La Silla observatory optical observations
  87. GRB 120807A: Enhanced Swift-XRT position
  88. GRB 120807A: Swift detection of a burst
  89. GRB 120805A: Swift/UVOT Upper Limits
  90. Swift trigger 530214: uncertain if real or not
  91. GRB 120802A: Swift/UVOT Upper Limits
  92. GRB 120805A: TAROT Calern observatory optical observations
  93. GRB 120805A: Swift detection of a burst
  94. GRB 120804A: Gemini-North observations
  95. GRB 120804A: MITSuME Okayama Optical upper limits
  96. GRB 120804A: Swift/UVOT Upper Limits
  97. GRB 120804A: GROND upper limits
  98. GRB 120804A: Enhanced Swift-XRT position
  99. GRB 120803B: MITSuME Okayama Optical upper limits
  100. GRB 120803A: MITSuME Okayama Optical upper limits

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