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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. GRB 140311A: Gemini-South redshift
  2. GRB 140311A: Enhanced Swift-XRT position
  3. GRB 140311A: Nanshan afterglow decay
  4. GRB 140311B: TAROT Calern observatory optical observations
  5. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  6. GRB 140311A: NOT observations of the optical afterglow
  7. GRB 140311A: Zadko observatory - Gingin optical observations
  8. GRB 140311B: MASTER early optical observations
  9. GRB 140311A: Nanshan OT detection
  10. GRB 140311A: MASTER early optical observations
  11. GRB 140304A: Continued RATIR Optical and NIR Observations
  12. GRB 140304A: 10.4m GTC refined redshift z = 5.283
  13. GRB 140304A: CARMA 3mm detection
  14. GRB 140304A: VLA Detection
  15. GRB 140304A: Redshift from the NOT
  16. GRB 140304A: 10.4m GTC redshift z = 5.39
  17. GRB 140304A: NOT observations and redshift estimate
  18. GRB 140304A: Swift/UVOT Upper Limits
  19. GRB 140304A: Khureltogot optical observations
  20. GRB 140304A: Mondy optical observations
  21. GRB 140304A: Afterglow decay from Nanshan observations
  22. GRB 140304A: MASTER OT detecton
  23. GRB 140301A: Swift/UVOT Upper Limits
  24. GRB 140302A: Swift/UVOT Upper Limits
  25. GRB 140302A: MITSuME Okayama upper limits
  26. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  27. GRB 140301A: VLT/X-shooter redshift
  28. GRB 140301A: NOT afterglow candidate
  29. GRB 140301A: Skynet R-COP Observations
  30. GRB 140226A/iPTF14yb: 1.23m CAHA observations
  31. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  32. GRB 140226A/iPTF14yb: Mondy optical observations
  33. GRB 140226A/iPTF14yb: RATIR Optical and NIR Observations
  34. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  35. GRB 140219A: Mondy optical observations of XRT source #5
  36. Konus-Wind observation of GRB 140226A
  37. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  38. PTF14yb: GROND Transient Detection
  39. iPTF14yb: RATIR Optical and NIR Observations of the optical transient
  40. iPTF14yb: iPTF Discovery of an Optical Afterglow-like Transient
  41. GRB 140219A: the confirmation of the brightening SDSS J102406.41+062937.6 star
  42. GRB 140219A: MASTER optical brightening inside XRT-5 error box detection
  43. GRB 140219A: iPTF optical observations
  44. GRB 140102A: TAOS early optical afterglow detection
  45. GRB 140219A: optical observations of XRT source #5
  46. GRB 140219A: Xuyi and Nanshan upper limits
  47. GRB 140219A: results from Swift XRT and UVOT tiled observations
  48. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  49. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  50. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  51. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  52. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  53. GRB 140215A: WSRT radio observation
  54. GRB 140211A: Khureltogot optical upper limits
  55. GRB 140215A: Continued RATIR Optical and NIR Observations
  56. GRB140215A: Continued Discovery Channel Telescope Observations
  57. GRB 140215A: Continued RATIR Optical and NIR Observations
  58. GRB 140215A: MITSuME Okayama Optical Observation
  59. GRB 140215A: ISON-NM optical observations
  60. GRB 140215A: P60 observations
  61. GRB 140215A: T24 optical observations
  62. GRB 140215A: RATIR Optical and NIR Observations
  63. GRB140215A: Skynet PROMPT Optical Observations
  64. GRB 140215A: KAIT Optical Detection
  65. GRB140215A: Prompt Observations with Discovery Channel Telescope
  66. GRB 140215A: Swift detection of a burst with optical counterpart
  67. GRB140206A: Discovery Channel Telescope Optical Detection
  68. GRB 140213A: Swift/UVOT Observations
  69. GRB140213A: VLT/X-shooter redshift
  70. GRB 140213A: GROND Detection of the Optical/NIR Afterglow
  71. GRB 140213A: Skynet R-COP Detection of Optical Afterglow
  72. GRB140209A: Swift/UVOT observations.
  73. GRB 140209A: Swift-XRT observations
  74. GRB 140211A: MITSuME Okayama upper limits
  75. GRB 140209A: Early RAPTOR Optical Detection
  76. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  77. GRB 140209A: optical observations
  78. GRB 140209A: P60 optical afterglow detection
  79. GRB 140206A: Mondy optical observations
  80. GRB 140206A: Liverpool Telescope optical afterglow observations
  81. GRB 140206A: MITSuME Akeno detection of the optical counterpart
  82. GRB 140206A: TNG redshift confirmation
  83. GRB 140206A: Optical Observations via Virtual Telescope
  84. GRB 140206A: NOT redshift
  85. GRB 140206A: TNG optical observations
  86. GRB 140206A: Swift/UVOT Detection
  87. GRB 140206A: ISON-Ussuriysk optical observations
  88. GRB 140206A: Nanshan optical observations
  89. GRB 140206A: MASTER OT detection
  90. GRB 140206A: Swift/UVOT optical detection
  91. GRB140206A - Optical afterglow candidate
  92. GRB 140129A: 5 GHz VLA observations
  93. GRB 140129A: Continued RATIR Optical and NIR Observations
  94. GRB 140129A: Khureltogot optical limit
  95. GRB 140129A: Continued RATIR Optical and NIR Observations
  96. GRB 140102A: MITSuME Akeno Optical observation
  97. GRB 140129B: MASTER OT early light curve
  98. GRB 140129A: CARMA early observations
  99. GRB 140129A: P200 spectroscopy
  100. GRB140129A: RAPTOR Observations of the Early Afterglow

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