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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"

28238 results found.

  1. GRB 120923A: TAROT La Silla observatory optical observations
  2. GRB 120923A: Swift detection of a burst
  3. GRB 120922A: GROND afterglow candidate
  4. GRB 120922A: Swift detection of a burst
  5. GRB 120919B: MASTER prompt optical observations
  6. GRB 120919A: Swift/UVOT Upper Limits
  7. GRB 120919A: Swift-XRT observations
  8. GRB 120919A: Fermi GBM detection
  9. GRB 120918A: Swift-BAT refined analysis
  10. Swift trigger 534017 was not an astrophysical event
  11. GRB 120916A: Fermi GBM Observation
  12. Swift Trigger 534017 is probably not real.
  13. IPN Triangulation of long GRB 120916A
  14. Swift Trigger 533836 is a new Galactic transient
  15. GRB 120913B: Swift-BAT refined analysis
  16. GRB 120913A: Swift-BAT refined analysis
  17. GRB 120913B: REM NIR early time detection
  18. Continued Skynet/PROMPT observations of GRB120913B
  19. GRB 120913B: TAROT La Silla observatory optical photometry
  20. GRB 120913B: TAROT La Silla observatory optical detection
  21. Skynet/PROMPT observations of GRB120913B
  22. GRB 120907A: optical observations of ISON-Kislovodsk
  23. GRB 120911A: optical upper limit CrAO
  24. GRB 120911A: optical upper limit ISON-NM
  25. GRB 120911B: Fermi-LAT detection of a burst
  26. GRB 120911A: Fermi GBM observation
  27. GRB120911A: MITSuME Okayama Optical upper limits
  28. GRB 120911A: Fermi/LAT upper limit
  29. GRB 120911A: Swift/UVOT Upper Limits
  30. GRB 120911A: Swift-XRT refined Analysis
  31. GRB 120911A: Swift-BAT refined analysis
  32. GRB 120911A: Enhanced Swift-XRT position
  33. GRB 120911A: Swift-XRT observations
  34. GRB 120911A: ROTSE-III Optical Limits
  35. GRB 120911A: Swift detection of a burst
  36. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  37. GRB 120908A: Fermi GBM detection
  38. GRB 120908A: Swift Observations
  39. GRB 120909A: TAROT La Silla observatory optical observations
  40. GRB 120909A: Pi of the Sky upper limits
  41. GRB 120909A: Fermi GBM observation
  42. Konus-Wind observation of GRB 120909A
  43. GRB 120909A: Swift/UVOT Detection
  44. GRB 120909A: Swift-XRT refined Analysis
  45. GRB 120909A: Swift-BAT refined analysis
  46. GRB 120909A: Enhanced Swift-XRT position
  47. GRB 120909A: GROND detection of the afterglow
  48. Skynet/PROMPT Observations of GRB120909A
  49. GRB 120909A: Swift detection of a burst
  50. GRB 120907A: Swift/UVOT Detection
  51. GRB 120907A: Swift-XRT refined Analysis
  52. GRB 120907A: Enhanced Swift-XRT position
  53. GRB 120907A: Fermi GBM detection
  54. GRB 120907A: Swift-BAT refined analysis
  55. GRB 120907A: NOT optical observations
  56. GRB 120907A: Swift detection of a burst with optical counterpart
  57. GRB 120802A: optical observations in CrAO
  58. GRB 120830A: Swift-XRT and UVOT observations
  59. GRB 120830A: early MASTER optical limit
  60. GRB 120830A: Fermi-LAT detection of a short burst
  61. Fermi trigger 368003226 : MASTER optical observations
  62. GRB 120819A: Swift/UVOT Upper Limits
  63. GRB 120817A: Swift/UVOT Upper Limits
  64. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  65. GRB 120821A: Swift/UVOT Upper Limits
  66. GRB 120821A: GROND upper limits
  67. GRB 120817B - PTF Observations
  68. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  69. GRB 120811C: optical observations
  70. GRB 120819A: MASTER final limits
  71. GRB 120819A: Bassano Bresciano Observatory optical observations
  72. GRB 120819A: Swift-BAT refined analysis
  73. GRB 120819A: GROND afterglow confirmation
  74. GRB 120819A: Swift-XRT refined Analysis
  75. GRB 120819A: MITSuME Ishigakijima upper limits
  76. GRB 120819A: MITSuME Okayama Optical upper limits
  77. GRB 120819A: Enhanced Swift-XRT position
  78. GRB 120819A: afterglow candidate from NOT
  79. GRB 120819A: Swift detection of a burst
  80. GRB 120817B: Swift-XRT observations
  81. GRB 120811C: optical observations
  82. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  83. GRB 120815A: MASTER-ICATE observations
  84. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  85. GRB 120817A: Swift-XRT refined Analysis
  86. GRB 120817B: LCO Optical Observations
  87. GRB 120817A: Swift-BAT refined analysis
  88. GRB 120816A: optical upper limit
  89. GRB 120817A: Enhanced Swift-XRT position
  90. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  91. GRB 120816A: Bassano Bresciano Observatory optical observations
  92. GRB 120817A: FTN and FTS observations
  93. GRB 120816A: Swift-XRT refined Analysis
  94. GRB 120817A: Swift-XRT observations
  95. GRB 120816A: Enhanced Swift-XRT position
  96. GRB 120816A: Swift-BAT refined analysis
  97. GRB 120816A: BOOTES-2 observations
  98. GRB120816A: OPTIMA discovery of optical counterpart
  99. GRB 120816A: TAROT Calern observatory optical observations
  100. GRB 120816A: ROTSE-III Optical Limits

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