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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"

16141 results found.

  1. GRB 131024B: Mondy optical upper limits
  2. GRB 131024B: MASTER prompt optical observation
  3. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  4. Swift Trigger 575905: ROTSE-III Optical Limits
  5. Swift Trigger 575905: KAIT Optical Upper Limit
  6. GRB 131026A: TAROT La Silla observatory optical observations
  7. GRB 131024B: RATIR Optical and NIR Observations
  8. GRB 131024B: Swift/UVOT Upper Limits
  9. GRB 131024B : Xinglong TNT upper limit
  10. GRB 131024B: Nanshan optical upper limit
  11. GRB 131024A: Swift/UVOT Upper Limits
  12. GRB 131024A: Skynet R-COP optical observations
  13. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  14. GRB 131018B: Swift/UVOT Upper Limits
  15. GRB 131018A: RATIR Optical and NIR Observations
  16. GRB 131018A: Swift/UVOT Upper Limits
  17. GRB 131018A: KAIT Optical Upper Limit
  18. GRB131018A, optical observations
  19. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  20. GRB 131011A: Swift/UVOT Upper Limits
  21. Fermi 403206457 / GRB 131011A: AAO optical observations
  22. GRB 131014A: RATIR Optical and NIR Observations
  23. GRB 131014A: Enhanced XRT position
  24. GRB 131014A: NOT afterglow candidate
  25. GRB 131014A: Nanshan optical observations
  26. GRB 131011A: Fermi GBM detection
  27. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  28. Fermi403206457: continued P60 observations and fading behavior
  29. Fermi403206457: Weihai optical upper limit
  30. Fermi403206457: NOT optical observations
  31. Fermi403206457: iPTF detection of a possible optical afterglow
  32. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  33. GRB 130831A: Continued RATIR Optical and NIR Observations
  34. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  35. GRB 131004A: MOSFIRE NIR imaging
  36. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  37. GRB 131004A: CARMA 93 GHz upper limit
  38. GRB 131004A: RATIR Optical and NIR Upper Limits
  39. GRB131004A: TNG Redshift confirmation
  40. GRB 131004A: GROND observations of the afterglow
  41. GRB131004A: Magellan Redshift
  42. GRB 131004A: Liverpool Telescope optical afterglow observations
  43. GRB 131004A: TNG optical afterglow confirmation
  44. GRB 131004A: optical afterglow from the NOT
  45. GRB 131002B: Swift/UVOT Upper Limits
  46. GRB 131002A: Swift/UVOT Detection
  47. GRB 131002A: ISON-NM optical observations
  48. GRB 131001A: Swift UVOT and XRT Upper Limits
  49. GRB 131002A: Faulkes Telescope North optical afterglow
  50. GRB 130929A: Swift/UVOT Upper Limits
  51. GRB 130831A: Continued RATIR Optical and NIR Observations
  52. GRB 130929A: TAROT La Silla observatory optical observations
  53. GRB 130925A: optical upper limit
  54. GRB 130925A: Continued RATIR Optical and NIR Observations
  55. GRB 130925A: RATIR Optical and NIR Observations
  56. GRB 130925A: Initial Similarities to Swift J1644+57
  57. GRB 130925A: TAROT La Silla observatory optical observations
  58. GRB 130925A: VLT/X-shooter redshift
  59. GRB 130925A: VLT/UVES observations
  60. GRB 130831A: RTT150 optical observations
  61. GRB 130702A: RTT150 optical observations
  62. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  63. GRB 130903A: optical observations
  64. GRB 130907A: Maidanak optical observations
  65. GRB 130912A: AAO optical upper limit
  66. Fermi Trigger 401326696: MASTER prompt optical observations
  67. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  68. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  69. GRB 130912A: Swift/UVOT Upper Limits
  70. GRB 130912A: 5.8 GHz VLA upper limit
  71. GRB 130912A: RATIR Optical and NIR Upper Limits
  72. GRB 130912A: WHT confirmation of optical counterpart
  73. GRB 130907A: Continued RATIR Optical and NIR Observations
  74. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  75. GRB 130912A: REM optical/NIR upper limits
  76. GRB 130912A: KAIT optical upper limit
  77. GRB 130907A: AMI radio detection
  78. GRB 130907A: Continued RATIR Optical and NIR Observations
  79. GRB 130907A: RATIR Optical and NIR Observations
  80. GRB 130907A: WSRT radio detection
  81. GRB 130907A: T21 optical observations
  82. GRB 130907A: VLA detection
  83. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  84. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  85. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  86. GRB 130831A: Maidanak optical observations
  87. GRB 130831A: optical observation in Chuguev AO
  88. GRB 130831A: ISON-Kislovodsk optical observations
  89. GRB 130907A: NOT redshift
  90. GRB 130831A: optical observation in Gissar AO
  91. GRB 130831A: ISON-UAFO optical observations
  92. GRB 130907A: MASTER early OT observations
  93. GRB 130907A: Swift detection of a burst with an optical counterpart
  94. Swift follow-up results of the possible weak INTEGRAL GRB
  95. GRB 130831A: RATIR Optical and NIR Upper Limits
  96. GRB 130903A: MASTER early optical limit
  97. GRB 130903A: Swift-XRT observations
  98. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  99. GRB 130831A: Montarrenti Observatory optical follow-up
  100. GRB 130831A: Optical Observations via Virtual Telescope, follow-up

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