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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20512 results found.

  1. GRB140215A: Continued Discovery Channel Telescope Observations
  2. GRB 140215A: Continued RATIR Optical and NIR Observations
  3. GRB 140215A: ISON-NM optical observations
  4. GRB 140215A: P60 observations
  5. GRB 140215A: T24 optical observations
  6. GRB 140215A: RATIR Optical and NIR Observations
  7. GRB140215A: Skynet PROMPT Optical Observations
  8. GRB 140215A: KAIT Optical Detection
  9. GRB140215A: Prompt Observations with Discovery Channel Telescope
  10. GRB140206A: Discovery Channel Telescope Optical Detection
  11. GRB 140213A: Swift/UVOT Observations
  12. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  13. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  14. GRB 140213A: Swift-XRT observations
  15. Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
  16. GRB140209A: Swift/UVOT observations.
  17. GRB 140209A: Swift-XRT observations
  18. GRB 140209A: Early RAPTOR Optical Detection
  19. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  20. GRB 140209A: optical observations
  21. GRB 140206A: Mondy optical observations
  22. GRB 140206A: Liverpool Telescope optical afterglow observations
  23. GRB 140206A: TNG redshift confirmation
  24. GRB 140206A: Optical Observations via Virtual Telescope
  25. GRB 140206A: NOT redshift
  26. GRB 140206A: TNG optical observations
  27. GRB 140206A: T100 observations
  28. GRB 140206A: Swift/UVOT Detection
  29. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  30. GRB 140206A: ISON-Ussuriysk optical observations
  31. GRB 140206B: Fermi-LAT detection
  32. GRB 140206A: Nanshan optical observations
  33. GRB140206A - Optical afterglow candidate
  34. GRB 140129A: 5 GHz VLA observations
  35. GRB 140129A: Continued RATIR Optical and NIR Observations
  36. GRB 140129B: Swift/UVOT Detection
  37. GRB 140129A: Continued RATIR Optical and NIR Observations
  38. GRB 140129A: CARMA early observations
  39. GRB140129A: RAPTOR Observations of the Early Afterglow
  40. GRB 140129A: Swift/UVOT Observations
  41. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  42. GRB 140129A: RATIR Optical and NIR Observations
  43. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  44. Fermi412093190: iPTF optical counterpart search
  45. GRB 140110A: Second Follow-up Swift-XRT Observation
  46. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  47. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  48. GRB 140118A: RATIR Optical and NIR Observations
  49. GRB 140110A: Further Swift-XRT Observation
  50. GRB 140108A: Mondy optical observations, refined analysis
  51. GRB 140114A: NOT afterglow observations
  52. GRB 140114A: Continued RATIR Optical and NIR Observations
  53. GRB 140114A: Swift/UVOT Upper Limits
  54. GRB 140114A: KAIT Optical Upper Limit
  55. GRB 140104B: Further Swift XRT observations
  56. GRB 140114A: P60 Observations
  57. GRB 140108A: Konkoly optical observations
  58. GRB 140110A: Swift/UVOT Observations
  59. GRB 140110A: Swift XRT observations
  60. GRB 140110A: Reported UVOT OT not GRB afterglow
  61. GRB 140110A: OT detection in Swift/UVOT imaging
  62. GRB 140110A Tiled Swift observations
  63. GRB 140105A: MASTER-Net early optical observations and time correction
  64. GRB 131231A: AAO optical observations
  65. GRB 140108A: Swift/UVOT Detection
  66. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  67. GRB 140108A: Mondy optical observations
  68. GRB 140108A: 1.23m CAHA observations
  69. New Fermi-LAT GRB Table
  70. GRB 140105A: HCT Observations
  71. GRB 140105A: continued iPTF observations and rejection of optical candidates
  72. GRB 140105A: Swift XRT observations
  73. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  74. GRB 140104B: Swift XRT observations
  75. GRB 140102A: Swift/UVOT Detection
  76. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  77. GRB 140102A: BOOTES-4 early optical observations
  78. GRB 131209A: Further Swift XRT observations
  79. GRB 140103A: Lulin Optical r-band Observations
  80. GRB 131231A : Lulin Optical Observations
  81. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  82. GRB 140102A, Optical Observations
  83. GRB 131231A, Optical Observations
  84. GRB 140103A: P60 Observations
  85. GRB 140102A: P60 observations
  86. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  87. GRB 140103A: Swift/UVOT Upper Limits
  88. GRB 140102A: Fermi/GBM Observation
  89. GRB 140103A: Swift-XRT refined analysis
  90. GRB 140102A: GROND observations
  91. GRB 140103A: MASTER-Net optical observations
  92. GRB 140102A: I-band observations from IAC80 and 1.23m CAHA telescopes
  93. GRB 140102A: Early optical observations from Nanshan
  94. GRB 131231A: Gemini-South Redshift
  95. GRB 131231A: P60 observations
  96. GRB 131231A: Swift-XRT observations
  97. GRB 131231A: Fermi GBM detection
  98. GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
  99. GRB 131231A: afterglow confirmation from the NOT
  100. GRB 131231A: Nanshan afterglow candidate

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