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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"

41916 results found.

  1. GRB 140304A: Swift-BAT refined analysis
  2. GRB 140304A: Swift-XRT refined Analysis
  3. GRB 140304A: Redshift from the NOT
  4. GRB 140304A: Fermi GBM detection
  5. GRB 140304A: 10.4m GTC redshift z = 5.39
  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 140304A: Swift detection of a burst
  13. GRB 140304A: MASTER OT detecton
  14. GRB 140301A: Swift/UVOT Upper Limits
  15. GRB 140302A: Swift/UVOT Upper Limits
  16. GRB 140302A: MITSuME Okayama upper limits
  17. GRB140302A: Fermi GBM detection
  18. GRB 140302A: Swift-XRT refined Analysis
  19. GRB 140302A: Swift-BAT refined analysis
  20. GRB 140301A: Swift-BAT refined analysis
  21. GRB 140301A: Swift-XRT refined Analysis
  22. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  23. GRB 140302A: GROND afterglow candidate
  24. GRB 140302A: Swift detection of a burst
  25. GRB 140301A: VLT/X-shooter redshift
  26. GRB 140301A: NOT afterglow candidate
  27. GRB 140301A: Skynet R-COP Observations
  28. GRB 140301A: Swift detection of a burst
  29. GRB 140226A/iPTF14yb: 1.23m CAHA observations
  30. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  31. GRB 140226A/iPTF14yb: Mondy optical observations
  32. GRB 140226A/iPTF14yb: RATIR Optical and NIR Observations
  33. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  34. GRB 140219A: Mondy optical observations of XRT source #5
  35. Konus-Wind observation of GRB 140226A
  36. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  37. PTF14yb: GROND Transient Detection
  38. iPTF14yb: RATIR Optical and NIR Observations of the optical transient
  39. GRB 140219A: Suzaku WAM observation of the prompt emission
  40. iPTF14yb: Swift-XRT detection
  41. iPTF14yb: iPTF Discovery of an Optical Afterglow-like Transient
  42. GRB 140219A: MAXI/GSC detection
  43. GRB 140219A: the confirmation of the brightening SDSS J102406.41+062937.6 star
  44. GRB 140219A: Retraction of X-ray afterglow
  45. GRB 140219A: MASTER optical brightening inside XRT-5 error box detection
  46. GRB 140219A: iPTF optical observations
  47. GRB 140102A: TAOS early optical afterglow detection
  48. GRB 140219A: optical observations of XRT source #5
  49. GRB 140219A: XRT afterglow candidate
  50. GRB 140221A: Results from Swift XRT tiled observations
  51. GRB 140219A: Xuyi and Nanshan upper limits
  52. GRB 140219A: results from Swift XRT and UVOT tiled observations
  53. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  54. Konus-Wind observation of exceptionally bright GRB 140219A
  55. GRB 140221A Tiled Swift observations
  56. GRB 140221A: MAXI/GSC detection
  57. GRB 140219A: Fermi-LAT detection of a burst
  58. GRB 140219A: Fermi GBM Detection
  59. GRB 140219A Tiled Swift observations
  60. Swift follow-up of an Integral weak transient
  61. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  62. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  63. Fermi GBM trigger 140214230 is not a GRB
  64. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  65. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  66. GRB 140215A: WSRT radio observation
  67. GRB 140211A: Khureltogot optical upper limits
  68. GRB 140215A: Continued RATIR Optical and NIR Observations
  69. Konus-Wind observation of GRB 140213A
  70. Konus-Wind observation of GRB 140215A
  71. GRB 140215A: Swift/UVOT Detection
  72. GRB 140211A: Swift-XRT and UVOT observations
  73. GRB140215A: Continued Discovery Channel Telescope Observations
  74. GRB 140215A: Continued RATIR Optical and NIR Observations
  75. GRB 140215A: MITSuME Okayama Optical Observation
  76. GRB 140215A: Swift-BAT refined analysis
  77. GRB 140215A: ISON-NM optical observations
  78. GRB 140215A: Swift-XRT refined Analysis
  79. GRB 140215A: P60 observations
  80. GRB 140215A: RATIR Optical and NIR Observations
  81. GRB140215A: Skynet PROMPT Optical Observations
  82. GRB 140215A: KAIT Optical Detection
  83. GRB140215A: Prompt Observations with Discovery Channel Telescope
  84. GRB 140215A: Swift detection of a burst with optical counterpart
  85. GRB 140213A: Swift-BAT refined analysis
  86. GRB140206A: Discovery Channel Telescope Optical Detection
  87. GRB 140213A: Swift/UVOT Observations
  88. GRB 140213A: Fermi GBM Detection
  89. GRB 140213A: Swift-XRT refined Analysis
  90. GRB140213A: VLT/X-shooter redshift
  91. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  92. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  93. GRB 140213A: Swift-XRT observations
  94. GRB 140213A: Swift/UVOT Detection
  95. GRB 140213A: Swift detection of a burst
  96. GRB140211A : Xinglong TNT upper limit
  97. Trigger 586482: Swift detection of GROJ1744-28
  98. Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
  99. GRB140209A: Swift/UVOT observations.
  100. GRB 140211A: Swift-BAT refined analysis

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