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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"

16119 results found.

  1. GRB 121017A: 1.23m CAHA R-band observations
  2. GRB 121017A optical observations
  3. GRB 121017A: BOOTES-2/TELMA observations
  4. GRB 121011A: WSRT radio observation
  5. GRB 121011A: optical observations
  6. GRB 121011A: NOT optical observations
  7. GRB 121011A: optical observations
  8. GRB 121011A: TNG optical observations
  9. GRB 121011A: MASTER-Net early OT light curve
  10. GRB121011A : Xinglong TNT optical observation
  11. GRB 121011A: MITSuME Okayama Optical Observation
  12. GRB 121011A: Swift detection of a burst with optical afterglow
  13. GRB 120927A: optical upper limit
  14. GRB 121001A: GROND Afterglow Confirmation
  15. GRB 121001A: Swift/UVOT Upper Limits
  16. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  17. GRB 121001A: MASTER optical observations
  18. GRB 121001A: possible optical counterpart
  19. Swift Trigger 535026: ROTSE-III Optical Limits
  20. GRB 120927A: Swift/UVOT Upper Limits
  21. GRB 120923A: optical upper limit
  22. GRB 120923A: RAPTOR Early Afterglow Limits
  23. GRB 120923A: MITSuME Okayama Optical upper limits
  24. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  25. GRB 120922A: GROND photometric redshift
  26. GRB 120922A: Swift/UVOT Detection
  27. GRB 120923A: Swift/UVOT Upper Limit
  28. GRB 120923A: Gemini afterglow detection, high-z candidate
  29. GRB 120922A: TAROT La Silla observatory optical observations
  30. GRB 120923A: TAROT La Silla observatory optical observations
  31. GRB 120923A: ROTSE-III Optical Limits
  32. GRB 120919B: MASTER prompt optical observations
  33. GRB 120919A: Swift/UVOT Upper Limits
  34. GRB 120913B: FRAM early follow up and detection
  35. GRB 120913B: REM NIR early time detection
  36. GRB 120913B: TAROT La Silla observatory optical photometry
  37. GRB 120913B: TAROT La Silla observatory optical detection
  38. GRB 120907A: optical observations of ISON-Kislovodsk
  39. GRB 120911A: optical upper limit CrAO
  40. GRB 120911A: optical upper limit ISON-NM
  41. GRB120911A: MITSuME Okayama Optical upper limits
  42. GRB 120911A: Swift/UVOT Upper Limits
  43. GRB 120911A: ROTSE-III Optical Limits
  44. GRB 120907A: SMA upper limits
  45. GRB 120908A: Swift Observations
  46. GRB 120909A: TAROT La Silla observatory optical observations
  47. GRB 120909A: Swift/UVOT Detection
  48. GRB 120909A: X-Shooter redshift 3.93
  49. GRB 120907A: EVLA observations
  50. GRB 120907A: NOT optical observations
  51. GRB 120907A MASTER optical observations
  52. GRB 120907A: ROTSE-III Optical Limits
  53. GRB 120907A: Swift detection of a burst with optical counterpart
  54. GRB 120819A: optical upper limit
  55. GRB 120802A: optical observations in CrAO
  56. GRB 120830A: early MASTER optical limit
  57. Fermi trigger 368003226 : MASTER optical observations
  58. GRB 120819A: Swift/UVOT Upper Limits
  59. GRB 120817A: Swift/UVOT Upper Limits
  60. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  61. GRB 120821A: Swift/UVOT Upper Limits
  62. GRB 120811C: optical observations
  63. GRB 120819A: Bassano Bresciano Observatory optical observations
  64. GRB 120819A: MITSuME Ishigakijima upper limits
  65. GRB 120819A: MITSuME Okayama Optical upper limits
  66. GRB 120819A: MASTER optical observations
  67. GRB 120811C: optical observations
  68. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  69. GRB 120815A: MASTER-ICATE observations
  70. GRB 120817B: LCO Optical Observations
  71. GRB 120816A: optical upper limit
  72. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  73. GRB 120816A: Bassano Bresciano Observatory optical observations
  74. GRB 120816A: BOOTES-2 observations
  75. GRB120816A: OPTIMA discovery of optical counterpart
  76. GRB 120816A: TAROT Calern observatory optical observations
  77. GRB 120816A: ROTSE-III Optical Limits
  78. GRB 120805A: Liverpool Telescope optical candidate detection
  79. GRB 120815A: TAROT La Silla observatory optical observations
  80. GRB 120811A: Swift/XRT-UVOT Obseravations
  81. GRB 120805A: optical afterglow confirmation from the NOT
  82. GRB 120805A: Enhanced Swift-XRT position
  83. GRB 120811C: EVLA Observations
  84. GRB 120811C: RTT150 optical observations
  85. GRB 120811C: MASTER-Tunka OT observations
  86. GRB 120811C: NOT redshift
  87. GRB 120811C: Bassano Bresciano Observatory optical observations
  88. GRB 120811C: RTT150 optical observations
  89. GRB 120811C: TAROT Calern observatory optical observations
  90. GRB 120811C: MASTER-Amur observations of fading OT
  91. GRB 120811C: Swift detection of a burst with an optical counterpart
  92. GRB 120803A: optical upper limit
  93. GRB 120807A: Swift/UVOT Upper Limits
  94. GRB 120714B: GROND/FORS2 detection of a supernova
  95. GRB 120802A: optical observations
  96. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  97. GRB 120807A: TAROT La Silla observatory optical observations
  98. GRB 120805A: Swift/UVOT Upper Limits
  99. GRB 120805A: 1.23m CAHA observations
  100. GRB 120805A: TAROT Calern observatory optical observations

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