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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"

20956 results found.

  1. GRB 140311A: MASTER early optical observations
  2. GRB 140304A: Continued RATIR Optical and NIR Observations
  3. GRB 140304A: MASTER OT light curve
  4. GRB 140304A: CARMA 3mm detection
  5. GRB 140304A: VLA Detection
  6. GRB 140304A: NOT observations and redshift estimate
  7. GRB 140304A: Swift/UVOT Upper Limits
  8. iPTF14yb: JVLA and CARMA observations
  9. GRB 140304A: Khureltogot optical observations
  10. GRB 140304A: Mondy optical observations
  11. GRB 140304A: Afterglow decay from Nanshan observations
  12. GRB 140301A: Swift/UVOT Upper Limits
  13. GRB 140302A: Swift/UVOT Upper Limits
  14. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  15. GRB 140302A: GROND afterglow candidate
  16. GRB 140301A: NOT afterglow candidate
  17. GRB 140301A: Skynet R-COP Observations
  18. GRB 140226A/iPTF14yb: 1.23m CAHA observations
  19. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  20. GRB 140226A/iPTF14yb: Mondy optical observations
  21. GRB 140226A/iPTF14yb: RATIR Optical and NIR Observations
  22. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  23. GRB 140219A: Mondy optical observations of XRT source #5
  24. PTF14yb: GROND Transient Detection
  25. iPTF14yb: RATIR Optical and NIR Observations of the optical transient
  26. iPTF14yb: iPTF Discovery of an Optical Afterglow-like Transient
  27. GRB 140219A: iPTF optical observations
  28. GRB 140102A: TAOS early optical afterglow detection
  29. GRB 140219A: optical observations of XRT source #5
  30. GRB 140219A: XRT afterglow candidate
  31. GRB 140221A: Results from Swift XRT tiled observations
  32. GRB 140219A: results from Swift XRT and UVOT tiled observations
  33. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  34. Konus-Wind observation of exceptionally bright GRB 140219A
  35. GRB 140221A Tiled Swift observations
  36. GRB 140219A Tiled Swift observations
  37. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  38. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  39. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  40. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  41. GRB 140215A: WSRT radio observation
  42. GRB 140215A: Continued RATIR Optical and NIR Observations
  43. GRB 140215A: Swift/UVOT Detection
  44. GRB 140211A: Swift-XRT and UVOT observations
  45. GRB140215A: Continued Discovery Channel Telescope Observations
  46. GRB 140215A: Continued RATIR Optical and NIR Observations
  47. GRB 140215A: ISON-NM optical observations
  48. GRB 140215A: P60 observations
  49. GRB 140215A: T24 optical observations
  50. GRB 140215A: RATIR Optical and NIR Observations
  51. GRB140215A: Skynet PROMPT Optical Observations
  52. GRB 140215A: KAIT Optical Detection
  53. GRB140215A: Prompt Observations with Discovery Channel Telescope
  54. GRB140206A: Discovery Channel Telescope Optical Detection
  55. GRB 140213A: Swift/UVOT Observations
  56. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  57. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  58. GRB 140213A: Swift-XRT observations
  59. Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
  60. GRB140209A: Swift/UVOT observations.
  61. GRB 140209A: Swift-XRT observations
  62. GRB 140209A: Early RAPTOR Optical Detection
  63. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  64. GRB 140209A: optical observations
  65. GRB 140206A: Mondy optical observations
  66. GRB 140206A: Liverpool Telescope optical afterglow observations
  67. GRB 140206A: TNG redshift confirmation
  68. GRB 140206A: Optical Observations via Virtual Telescope
  69. GRB 140206A: NOT redshift
  70. GRB 140206A: TNG optical observations
  71. GRB 140206A: T100 observations
  72. GRB 140206A: Swift/UVOT Detection
  73. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  74. GRB 140206A: ISON-Ussuriysk optical observations
  75. GRB 140206B: Fermi-LAT detection
  76. GRB 140206A: Nanshan optical observations
  77. GRB140206A - Optical afterglow candidate
  78. GRB 140129A: 5 GHz VLA observations
  79. GRB 140129A: Continued RATIR Optical and NIR Observations
  80. GRB 140129B: Swift/UVOT Detection
  81. GRB 140129A: Continued RATIR Optical and NIR Observations
  82. GRB 140129A: CARMA early observations
  83. GRB140129A: RAPTOR Observations of the Early Afterglow
  84. GRB 140129A: Swift/UVOT Observations
  85. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  86. GRB 140129A: RATIR Optical and NIR Observations
  87. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  88. Fermi412093190: iPTF optical counterpart search
  89. GRB 140110A: Second Follow-up Swift-XRT Observation
  90. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  91. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  92. GRB 140118A: RATIR Optical and NIR Observations
  93. GRB 140110A: Further Swift-XRT Observation
  94. GRB 140108A: Mondy optical observations, refined analysis
  95. GRB 140114A: NOT afterglow observations
  96. GRB 140114A: Continued RATIR Optical and NIR Observations
  97. GRB 140114A: Swift/UVOT Upper Limits
  98. GRB 140114A: KAIT Optical Upper Limit
  99. GRB 140104B: Further Swift XRT observations
  100. GRB 140114A: P60 Observations

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