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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 131014A: Enhanced XRT position
  2. GRB 131014A: NOT afterglow candidate
  3. GRB 131014A: Nanshan optical observations
  4. GRB 131011A: Fermi GBM detection
  5. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  6. Fermi403206457: continued P60 observations and fading behavior
  7. Fermi403206457: Weihai optical upper limit
  8. Fermi403206457: NOT optical observations
  9. Fermi403206457: iPTF detection of a possible optical afterglow
  10. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  11. GRB 130831A: Continued RATIR Optical and NIR Observations
  12. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  13. GRB 131004A: MOSFIRE NIR imaging
  14. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  15. GRB 131004A: CARMA 93 GHz upper limit
  16. GRB 131004A: RATIR Optical and NIR Upper Limits
  17. GRB131004A: TNG Redshift confirmation
  18. GRB 131004A: GROND observations of the afterglow
  19. GRB131004A: Magellan Redshift
  20. GRB 131004A: Liverpool Telescope optical afterglow observations
  21. GRB 131004A: TNG optical afterglow confirmation
  22. GRB 131004A: optical afterglow from the NOT
  23. GRB 131002B: Swift/UVOT Upper Limits
  24. GRB 131002A: Swift/UVOT Detection
  25. GRB 131002A: ISON-NM optical observations
  26. GRB 131001A: Swift UVOT and XRT Upper Limits
  27. GRB 131002A: Faulkes Telescope North optical afterglow
  28. GRB 130929A: Swift/UVOT Upper Limits
  29. GRB 130831A: Continued RATIR Optical and NIR Observations
  30. GRB 130929A: TAROT La Silla observatory optical observations
  31. GRB 130925A: optical upper limit
  32. GRB 130925A: Continued RATIR Optical and NIR Observations
  33. GRB 130925A: RATIR Optical and NIR Observations
  34. GRB 130925A: Initial Similarities to Swift J1644+57
  35. GRB 130925A: TAROT La Silla observatory optical observations
  36. GRB 130925A: VLT/X-shooter redshift
  37. GRB 130925A: VLT/UVES observations
  38. GRB 130831A: RTT150 optical observations
  39. GRB 130702A: RTT150 optical observations
  40. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  41. GRB 130903A: optical observations
  42. GRB 130907A: Maidanak optical observations
  43. GRB 130912A: AAO optical upper limit
  44. Fermi Trigger 401326696: MASTER prompt optical observations
  45. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  46. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  47. GRB 130912A: Swift/UVOT Upper Limits
  48. GRB 130912A: 5.8 GHz VLA upper limit
  49. GRB 130912A: RATIR Optical and NIR Upper Limits
  50. GRB 130912A: WHT confirmation of optical counterpart
  51. GRB 130907A: Continued RATIR Optical and NIR Observations
  52. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  53. GRB 130912A: REM optical/NIR upper limits
  54. GRB 130912A: KAIT optical upper limit
  55. GRB 130907A: AMI radio detection
  56. GRB 130907A: Continued RATIR Optical and NIR Observations
  57. GRB 130907A: RATIR Optical and NIR Observations
  58. GRB 130907A: WSRT radio detection
  59. GRB 130907A: T21 optical observations
  60. GRB 130907A: VLA detection
  61. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  62. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  63. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  64. GRB 130831A: Maidanak optical observations
  65. GRB 130831A: optical observation in Chuguev AO
  66. GRB 130831A: ISON-Kislovodsk optical observations
  67. GRB 130907A: NOT redshift
  68. GRB 130831A: optical observation in Gissar AO
  69. GRB 130831A: ISON-UAFO optical observations
  70. GRB 130907A: MASTER early OT observations
  71. GRB 130907A: Swift detection of a burst with an optical counterpart
  72. Swift follow-up results of the possible weak INTEGRAL GRB
  73. GRB 130831A: RATIR Optical and NIR Upper Limits
  74. GRB 130903A: MASTER early optical limit
  75. GRB 130903A: Swift-XRT observations
  76. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  77. GRB 130831A: Montarrenti Observatory optical follow-up
  78. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  79. GRB 130831A: RATIR Optical and NIR Observations
  80. GRB 130831A: VLA Observations
  81. GRB 130831B: Swift/UVOT Upper Limits
  82. GRB 130831A: THO optical observation
  83. GRB 130831A: optical observations
  84. GRB 130831A: Optical Observations via Virtual Telescope
  85. GRB 130831A: Montarrenti Observatory optical observations
  86. GRB 130831A : Xinglong 60cm optical observation
  87. GRB 130831A: MITSuME Akeno Optical observation
  88. GRB 130831A: Weihai optical observations
  89. GRB 130831A: Faulkes Telescope North and South optical afterglow
  90. GRB 130831A: Swift detection of a burst with an optical counterpart
  91. GRB 130822A: optical upper limits
  92. GRB 130829A: AAO optical observations
  93. GRB 130829A: NOT optical observations
  94. GRB 130821A: Weihai optical upper limit
  95. GRB 130822A: Swift/UVOT Upper Limits
  96. GRB 130822A: Weihai optical upper limit
  97. GRB 130816A: REM NIR candidate afterglow
  98. GRB 130812A: Swift/UVOT Upper Limits
  99. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  100. GRB130807A: Swift/UVOT observations

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