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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"

16268 results found.

  1. Fermi403206457: iPTF detection of a possible optical afterglow
  2. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  3. GRB 130831A: Continued RATIR Optical and NIR Observations
  4. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  5. GRB 131004A: MOSFIRE NIR imaging
  6. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  7. GRB 131004A: CARMA 93 GHz upper limit
  8. GRB 131004A: RATIR Optical and NIR Upper Limits
  9. GRB131004A: TNG Redshift confirmation
  10. GRB 131004A: GROND observations of the afterglow
  11. GRB131004A: Magellan Redshift
  12. GRB 131004A: Liverpool Telescope optical afterglow observations
  13. GRB 131004A: TNG optical afterglow confirmation
  14. GRB 131004A: optical afterglow from the NOT
  15. GRB 131002B: Swift/UVOT Upper Limits
  16. GRB 131002A: Swift/UVOT Detection
  17. GRB 131002A: ISON-NM optical observations
  18. GRB 131001A: Swift UVOT and XRT Upper Limits
  19. NuSTAR observations of GRB 130925A
  20. GRB 131002A: Faulkes Telescope North optical afterglow
  21. GRB 130925A: continuing Swift/XRT monitoring
  22. GRB 130929A: Swift/UVOT Upper Limits
  23. GRB 130831A: Continued RATIR Optical and NIR Observations
  24. GRB 130929A: TAROT La Silla observatory optical observations
  25. GRB 130925A: optical upper limit
  26. GRB 130925A: Continued RATIR Optical and NIR Observations
  27. GRB 130925A: RATIR Optical and NIR Observations
  28. GRB 130925A: Initial Similarities to Swift J1644+57
  29. GRB 130925A: TAROT La Silla observatory optical observations
  30. GRB 130925A: VLT/X-shooter redshift
  31. GRB 130925A: VLT/UVES observations
  32. GRB 130831A: RTT150 optical observations
  33. GRB 130702A: RTT150 optical observations
  34. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  35. GRB 130903A: optical observations
  36. GRB 130907A: Maidanak optical observations
  37. GRB 130912A: AAO optical upper limit
  38. Fermi Trigger 401326696: MASTER prompt optical observations
  39. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  40. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  41. GRB 130912A: Swift/UVOT Upper Limits
  42. GRB 130912A: 5.8 GHz VLA upper limit
  43. GRB 130912A: RATIR Optical and NIR Upper Limits
  44. GRB 130912A: WHT confirmation of optical counterpart
  45. GRB 130907A: Continued RATIR Optical and NIR Observations
  46. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  47. GRB 130912A: REM optical/NIR upper limits
  48. GRB 130912A: KAIT optical upper limit
  49. GRB 130907A: AMI radio detection
  50. GRB 130907A: Continued RATIR Optical and NIR Observations
  51. GRB 130907A: RATIR Optical and NIR Observations
  52. GRB 130907A: WSRT radio detection
  53. GRB 130907A: T21 optical observations
  54. GRB 130907A: VLA detection
  55. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  56. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  57. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  58. GRB 130831A: Maidanak optical observations
  59. GRB 130831A: optical observation in Chuguev AO
  60. GRB 130831A: ISON-Kislovodsk optical observations
  61. GRB 130907A: NOT redshift
  62. GRB 130831A: optical observation in Gissar AO
  63. GRB 130831A: ISON-UAFO optical observations
  64. GRB 130907A: MASTER early OT observations
  65. GRB 130907A: Swift detection of a burst with an optical counterpart
  66. Swift follow-up results of the possible weak INTEGRAL GRB
  67. GRB 130831A: RATIR Optical and NIR Upper Limits
  68. GRB 130903A: MASTER early optical limit
  69. GRB 130903A: Swift-XRT observations
  70. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  71. GRB 130831A: Montarrenti Observatory optical follow-up
  72. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  73. GRB 130831A: RATIR Optical and NIR Observations
  74. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  75. GRB 130831A: VLA Observations
  76. GRB 130831B: Swift/UVOT Upper Limits
  77. GRB 130831A: THO optical observation
  78. GRB 130831A: optical observations
  79. GRB 130831A: Optical Observations via Virtual Telescope
  80. GRB 130831A: Montarrenti Observatory optical observations
  81. GRB 130831A : Xinglong 60cm optical observation
  82. GRB 130831A: MITSuME Akeno Optical observation
  83. GRB 130831A: Weihai optical observations
  84. GRB 130831A: Faulkes Telescope North and South optical afterglow
  85. GRB 130831A: Swift detection of a burst with an optical counterpart
  86. GRB 130822A: optical upper limits
  87. GRB 130829A: AAO optical observations
  88. GRB 130829A: NOT optical observations
  89. GRB 130821A: Weihai optical upper limit
  90. GRB 130822A: Swift/UVOT Upper Limits
  91. GRB 130822A: Weihai optical upper limit
  92. GRB 130816A: REM NIR candidate afterglow
  93. GRB 130812A: Swift/UVOT Upper Limits
  94. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  95. GRB130807A: Swift/UVOT observations
  96. GRB 130623A: GROND detection of the optical/NIR afterglow
  97. GRB 130806A: MITSuME Akeno Optical observation
  98. GRB 130806A: MITSuME Okayama upper limits
  99. GRB 130803A: RATIR Optical and NIR Observations
  100. GRB 130803A: Swift/UVOT Upper Limits

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