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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"

16233 results found.

  1. GRB 131108A: 1.23m CAHA optical candidate
  2. GRB 131030A: RATIR Optical and NIR Upper Limits
  3. GRB 131030A: Continued RATIR Optical and NIR Observations
  4. GRB 131105A: Swift/UVOT Upper Limits
  5. GRB 131105A: TAROT La Silla observatory optical observations
  6. GRB 131105A: VLT/X-shooter optical afterglow candidate
  7. GRB 131103A: NOT and VLT observations
  8. GRB 131030A: Continued RATIR Optical and NIR Observations
  9. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  10. GRB131031A: RATIR Optical and NIR Observations
  11. GRB 131018B: RATIR Optical/NIR Observations
  12. GRB 131030A: Continued RATIR Optical and NIR Observations
  13. GRB 131031A: Swift/UVOT Upper Limits
  14. LOAO B,R Observation of GRB131030A
  15. GRB 131030A - RoboPol optical afterglow polarimetry
  16. GRB 131031A: MASTER optical observation
  17. GRB 131030A: Bassano Bresciano Observatory optical observations
  18. GRB 131031A: 1.23m CAHA afterglow candidate
  19. GRB131030A : xinglong TNT optical observation
  20. GRB 131030A: RATIR Optical and NIR Observations
  21. GRB 131030A: TAROT La Silla observatory optical observations
  22. GRB 131030A: T21 optical observations
  23. GRB 131030A: SAO RAS optical observations
  24. GRB 131030A: 1.23m CAHA BVRI-band observations
  25. GRB 131030A: D50+BART detection and light curve optical decay
  26. GRB 131029A: Nanshan optical observations
  27. GRB 131030A: NOT redshift
  28. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  29. GRB 131030A: MASTER optical observation
  30. GRB 131030A: Watcher OT detection
  31. GRB 131030A: Swift detection of a burst with an optical counterpart
  32. GRB 131011A: ATCA 34GHz upper limit
  33. Swift 575905/GRB 131026A: optical observations
  34. Swift-BAT Trigger 575905 is probably not a real source
  35. GRB 131024B: AAO optical upper limit
  36. GRB 131024B: Mondy optical upper limits
  37. GRB 131024B: MASTER prompt optical observation
  38. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  39. Swift Trigger 575905: ROTSE-III Optical Limits
  40. Swift Trigger 575905: KAIT Optical Upper Limit
  41. GRB 131026A: TAROT La Silla observatory optical observations
  42. GRB 131024B: RATIR Optical and NIR Observations
  43. GRB 131024B: Swift/UVOT Upper Limits
  44. GRB 131024B : Xinglong TNT upper limit
  45. GRB 131024B: Nanshan optical upper limit
  46. GRB 131024A: Swift/UVOT Upper Limits
  47. GRB 131024A: Skynet R-COP optical observations
  48. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  49. GRB 131018B: Swift/UVOT Upper Limits
  50. GRB 131018A: RATIR Optical and NIR Observations
  51. GRB 131018A: Swift/UVOT Upper Limits
  52. GRB 131018A: KAIT Optical Upper Limit
  53. GRB131018A, optical observations
  54. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  55. GRB 131011A: Swift/UVOT Upper Limits
  56. Fermi 403206457 / GRB 131011A: AAO optical observations
  57. GRB 131014A: RATIR Optical and NIR Observations
  58. GRB 131014A: Enhanced XRT position
  59. GRB 131014A: NOT afterglow candidate
  60. GRB 131014A: Nanshan optical observations
  61. GRB 131011A: Fermi GBM detection
  62. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  63. Fermi403206457: continued P60 observations and fading behavior
  64. Fermi403206457: Weihai optical upper limit
  65. Fermi403206457: NOT optical observations
  66. Fermi403206457: iPTF detection of a possible optical afterglow
  67. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  68. GRB 130831A: Continued RATIR Optical and NIR Observations
  69. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  70. GRB 131004A: MOSFIRE NIR imaging
  71. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  72. GRB 131004A: CARMA 93 GHz upper limit
  73. GRB 131004A: RATIR Optical and NIR Upper Limits
  74. GRB131004A: TNG Redshift confirmation
  75. GRB 131004A: GROND observations of the afterglow
  76. GRB131004A: Magellan Redshift
  77. GRB 131004A: Liverpool Telescope optical afterglow observations
  78. GRB 131004A: TNG optical afterglow confirmation
  79. GRB 131004A: optical afterglow from the NOT
  80. GRB 131002B: Swift/UVOT Upper Limits
  81. GRB 131002A: Swift/UVOT Detection
  82. GRB 131002A: ISON-NM optical observations
  83. GRB 131001A: Swift UVOT and XRT Upper Limits
  84. NuSTAR observations of GRB 130925A
  85. GRB 131002A: Faulkes Telescope North optical afterglow
  86. GRB 130925A: continuing Swift/XRT monitoring
  87. GRB 130929A: Swift/UVOT Upper Limits
  88. GRB 130831A: Continued RATIR Optical and NIR Observations
  89. GRB 130929A: TAROT La Silla observatory optical observations
  90. GRB 130925A: optical upper limit
  91. GRB 130925A: Continued RATIR Optical and NIR Observations
  92. GRB 130925A: RATIR Optical and NIR Observations
  93. GRB 130925A: Initial Similarities to Swift J1644+57
  94. GRB 130925A: TAROT La Silla observatory optical observations
  95. GRB 130925A: VLT/X-shooter redshift
  96. GRB 130925A: VLT/UVES observations
  97. GRB 130831A: RTT150 optical observations
  98. GRB 130702A: RTT150 optical observations
  99. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  100. GRB 130903A: optical observations

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