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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"

16099 results found.

  1. GRB 121212A: Maidanak optical observations
  2. GRB 121211A: RATIR Optical and NIR Observations
  3. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  4. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  5. GRB 121212A: optical observations in ISON-NM observatory
  6. GRB 121211A: MITSuME Okayama Optical Observation
  7. GRB 121211A: Keck/LRIS redshift
  8. GRB 121211A - Faulkes Telescope North afterglow confirmation
  9. GRB 121211A: Swift detection of a burst with an optical counterpart
  10. GRB 121209A: Keck observations
  11. GRB 121209A: CARMA 3mm Observations
  12. GRB 121209A: EVLA Observations
  13. GRB121209A: RATIR Optical and NIR Upper Limits
  14. GRB 121209A: GROND optical afterglow candidate
  15. GRB 121209A: Gemini-South imaging
  16. GRB 121128A: Optical Observations
  17. GRB 121202A: Swift/UVOT Upper Limits
  18. GRB 121202A: TAROT Calern observatory optical observations
  19. GRB 121201A: GROND afterglow observations and photometric redshift
  20. GRB 121201A: BOOTES-4 optical observations
  21. GRB 121201A: a GRB with an optical counterpart
  22. GRB 121128A: optical observation in Mondy observatory
  23. GRB 121128A: MITSuME Akeno Optical upper limits
  24. GRB 121125A: optical upper limit
  25. GRB 121128A: optical observation in Mondy observatory
  26. GRB 121128A: WSRT radio observation
  27. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  28. GRB 121128A: FTN optical afterglow confirmation
  29. GRB 121128A: Swift detection of a burst with an optical counterpart
  30. GRB 121117A: Terskol obseravtions
  31. GRB 121123A: Swift/UVOT Observations
  32. GRB 121125A: MASTER-NET optical observations
  33. GRB 121125A: Swift detection of a burst with optical counterpart
  34. GRB 121123A: GROND observations
  35. GRB 121123A: optical observations
  36. GRB 121123A: BOOTES-4 and IAC80 optical observations
  37. GRB 121123A: NOT optical observations
  38. GRB 121123A: MASTER-NET optical limit
  39. GRB 121123A: GMG optical observation
  40. GRB 121123A: Swift detection of a burst with optical counterpart
  41. GRB 121108A: optical upper limit
  42. GRB 121117A: Optical observations
  43. GRB 121117A: optical upper limit
  44. GRB 121117A: Swift/UVOT Observations
  45. GRB 121117A: MASTER prompt optical limit
  46. GRB 121117A: ROTSE-III Optical Limits
  47. GRB 121117A: BOOTES-3 early optical upper limit
  48. GRB 121108A: Swift/UVOT Upper Limits
  49. GRB 121108A: Xinglong TNT upper limit
  50. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  51. GRB 121108A: Optical observations
  52. GRB 121108A: MITSuME Ishigakijima upper limits
  53. GRB 121108A: Weihai observatory optical observations
  54. GRB 121108A: MASTER early prompt optical limit
  55. GRB 121108A: TAROT Calern observatory optical observations
  56. GRB 121102A: Swift/UVOT Upper Limits
  57. GRB 121031A: Swift/UVOT Upper Limits
  58. GRB 121027A: X-shooter redshift confirmation
  59. GRB 121024A: SMARTS optical/IR afterglow observations
  60. GRB 121027A: GROND Confirmation of Rebrightening
  61. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  62. GRB 121027A: MASTER early prompt optical limit
  63. GRB 121028A: MITSuME Okayama Optical upper limits
  64. GRB 121011A: optical observations
  65. GRB 121024A: optical observations
  66. GRB 121024A: EVLA Detection
  67. GRB 121024A: Swift/UVOT Observations
  68. GRB 121024A: CARMA 3mm Detection
  69. GRB 121024A: GMG optical observation
  70. GRB 121024A: MITSuME Ishigakijima upper limits
  71. GRB 121024A: MITSuME Okayama Optical upper limits
  72. GRB 121024A: PAIRITEL NIR Detection
  73. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  74. Skynet PROMPT/Dolomiti observations of GRB121024A
  75. GRB 121024A: BOOTES-1B optical detection
  76. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  77. GRB 121024A: Swift detection of a burst with an optical counterpart
  78. GRB 121011A: early optical light curve
  79. GRB 121017A: Swift/UVOT Upper Limits
  80. GRB 121017A: GROND Observations
  81. GRB 121017A: 1.23m CAHA R-band observations
  82. GRB 121017A optical observations
  83. GRB 121017A: BOOTES-2/TELMA observations
  84. GRB 121011A: WSRT radio observation
  85. GRB 121011A: optical observations
  86. GRB 121011A: NOT optical observations
  87. GRB 121011A: optical observations
  88. GRB 121011A: TNG optical observations
  89. GRB 121011A: MASTER-Net early OT light curve
  90. GRB121011A : Xinglong TNT optical observation
  91. GRB 121011A: MITSuME Okayama Optical Observation
  92. GRB 121011A: Swift detection of a burst with optical afterglow
  93. GRB 120927A: optical upper limit
  94. GRB 121001A: GROND Afterglow Confirmation
  95. GRB 121001A: Swift/UVOT Upper Limits
  96. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  97. GRB 121001A: MASTER optical observations
  98. GRB 121001A: possible optical counterpart
  99. Swift Trigger 535026: ROTSE-III Optical Limits
  100. GRB 120927A: Swift/UVOT Upper Limits

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