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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"

20517 results found.

  1. GRB 121108A: Weihai observatory optical observations
  2. GRB 121108A: TAROT Calern observatory optical observations
  3. GRB 121108A: Swift detection of a burst
  4. GRB 121028A: Swift/UVOT Upper Limits
  5. GRB 121102A: Swift/UVOT Upper Limits
  6. GRB 121031A: Swift/UVOT Upper Limits
  7. GRB 121102A: Enhanced Swift-XRT position
  8. GRB 121031A: Enhanced Swift-XRT position
  9. GRB 121102A: Swift-XRT refined Analysis
  10. GRB 121102A: Swift detection of a burst
  11. GRB 121031A: Swift-BAT refined analysis
  12. GRB 121031A: Swift detection of a burst
  13. GRB 121027A: Swift/UVOT Possible Detection
  14. GRB 121024A: SMARTS optical/IR afterglow observations
  15. GRB 121027A: GROND Confirmation of Rebrightening
  16. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  17. GRB 121027A: MASTER early prompt optical limit
  18. GRB 121027A: Swift-XRT refined Analysis
  19. GRB 121028A: Enhanced Swift-XRT position
  20. GRB 121028A: Swift-BAT refined analysis
  21. GRB 121027A: Enhanced Swift-XRT position
  22. GRB 121028A: MITSuME Okayama Optical upper limits
  23. GRB 121028A: Swift detection of a burst
  24. GRB 121011A: optical observations
  25. GRB 121027A: nIR afterglow candidate with AAT
  26. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  27. GRB 121027A: Swift detection of a burst
  28. GRB 121024A: optical observations
  29. GRB 121024A: Swift/UVOT Observations
  30. GRB 121024A: GMG optical observation
  31. GRB 121024A: MITSuME Ishigakijima upper limits
  32. GRB 121024A: MITSuME Okayama Optical upper limits
  33. GRB 121025A: MAXI/GSC detection
  34. GRB 121024A: Enhanced Swift-XRT position
  35. GRB 121024A: PAIRITEL NIR Detection
  36. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  37. Skynet PROMPT/Dolomiti observations of GRB121024A
  38. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  39. GRB 121024A: Swift detection of a burst with an optical counterpart
  40. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  41. GRB 121017A: Swift/UVOT Upper Limits
  42. GRB 121017A: GROND Observations
  43. GRB 121017A: Enhanced Swift-XRT position
  44. GRB 121017A: 1.23m CAHA R-band observations
  45. GRB 121017A optical observations
  46. GRB 121017A: Swift detection of a burst
  47. GRB 121011A: Swift/UVOT Detection
  48. GRB 121011A: Fermi-LAT detection of a burst
  49. GRB 121011A: Swift-XRT refined Analysis
  50. GRB 121011A: optical observations
  51. GRB 121011A: Enhanced Swift-XRT position
  52. GRB 121011A: MITSuME Okayama Optical Observation
  53. GRB 121011A: Swift detection of a burst with optical afterglow
  54. Trigger 535747: Swift detection of an outburst from SGR1806-20
  55. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  56. GRB 120927A: optical upper limit
  57. GRB 120804A: Late-time Chandra observation
  58. GRB 121001A: GROND Afterglow Confirmation
  59. GRB 121001A: Swift/UVOT Upper Limits
  60. GRB 121001A: Swift-XRT refined Analysis
  61. GRB 121001A: Enhanced Swift-XRT Position
  62. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  63. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  64. GRB 121001A: possible optical counterpart
  65. Swift Trigger 535026: Galactic Transient or possible GRB
  66. GRB 120927A: Swift/UVOT Upper Limits
  67. GRB 120927A: GROND upper limits
  68. GRB 120927A: Enhanced Swift-XRT position
  69. GRB 120923A: JHK Observation
  70. GRB 120927A: Swift detection of a burst
  71. Further Swift-XRT observations of the GRB 120919A field.
  72. GRB 120923A: optical upper limit
  73. GRB 120921A: Fermi GBM detection of its 1000th GRB
  74. GRB 120923A: RAPTOR Early Afterglow Limits
  75. GRB 120923A: MITSuME Okayama Optical upper limits
  76. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  77. GRB 120923A: GROND Upper limits
  78. GRB 120922A: GROND photometric redshift
  79. GRB 120922A: Swift/UVOT Detection
  80. GRB 120923A: Swift/UVOT Upper Limit
  81. GRB 120923A: Enhanced Swift-XRT position
  82. GRB 120922A: Enhanced Swift-XRT position
  83. GRB 120922A: TAROT La Silla observatory optical observations
  84. GRB 120923A: TAROT La Silla observatory optical observations
  85. GRB 120923A: Swift detection of a burst
  86. GRB 120922A: GROND afterglow candidate
  87. GRB 120922A: Swift detection of a burst
  88. GRB 120919B: MASTER prompt optical observations
  89. GRB 120919A: Swift/UVOT Upper Limits
  90. Swift trigger 534017 was not an astrophysical event
  91. Swift Trigger 534017 is probably not real.
  92. IPN Triangulation of long GRB 120916A
  93. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  94. Swift Trigger 533836 is a new Galactic transient
  95. GRB 120913B: Swift-BAT refined analysis
  96. GRB 120913A: Fermi GBM observation
  97. GRB 120913B: REM NIR early time detection
  98. Continued Skynet/PROMPT observations of GRB120913B
  99. GRB 120913B: TAROT La Silla observatory optical detection
  100. Skynet/PROMPT observations of GRB120913B

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