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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"

37358 results found.

  1. GRB 140311A: further NOT observations
  2. GRB 140311B: Swift-BAT refined analysis
  3. GRB 140311A: RATIR Optical and NIR Detection
  4. GRB 140311C: Fermi GBM Detection
  5. GRB 140311A: Montarrenti Observatory optical upper limit
  6. GRB 140311B: Fermi GBM Detection
  7. GRB 140311A: Kottamia I-band observation
  8. GRB 140311A: Swift/UVOT Upper Limits
  9. GRB 140311B: Swift/UVOT Upper Limits
  10. GRB 140311B: RATIR Optical and NIR Observations
  11. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  12. GRB 140311A: Swift-XRT refined Analysis
  13. GRO J1744-28: Fermi GBM observation
  14. GRB 140311A: Gemini-North redshift
  15. GRB 140302A: GROND confirmation of the afterglow
  16. GRB 140311A: NOT redshift confirmation
  17. GRB 140311B: Swift-XRT refined Analysis
  18. GRB 140311A: Swift-BAT refined analysis
  19. GRB 140311A: Gemini-South redshift
  20. GRB 140311B: final MASTER OT light curve
  21. GRB 140311A: Enhanced Swift-XRT position
  22. GRB 140311B: Enhanced Swift-XRT position
  23. GRB 140311A: Recalibration of photometry of OT detected with Kottamia 188cm telescope
  24. GRB 140311A: Nanshan afterglow decay
  25. GRB 140311B: TAROT Calern observatory optical observations
  26. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  27. GRB 140311A: NOT observations of the optical afterglow
  28. GRB 140311A: Zadko observatory - Gingin optical observations
  29. GRB 140311B: Swift-XRT observations
  30. GRB 140311B: Nanshan afterglow detection
  31. GRB 140311B: MASTER early optical observations
  32. GRB 140311A: Nanshan OT detection
  33. GRB 140311A: MASTER early optical observations
  34. GRB 140311B: Swift detection of a burst
  35. GRB 140311A: Swift detection of a probable burst
  36. Konus-Wind observation of GRB 140308A
  37. GRB 140304A: Suzaku WAM observation of the prompt emission
  38. IPN Triangulation of GRB 140308A
  39. GRB 140306A: Suzaku WAM observation of the prompt emission
  40. Konus-Wind observation of GRB 140306A
  41. IPN Triangulation of GRB 140306A
  42. GRB 140304A: Continued RATIR Optical and NIR Observations
  43. GRB 140304A: 10.4m GTC refined redshift z = 5.283
  44. GRB 140306A: Fermi GBM detection
  45. GRB 140305A: Swift-BAT refined analysis
  46. GRB 140304A: MASTER OT light curve
  47. GRB 140304A: CARMA 3mm detection
  48. GRB 140304A: VLA Detection
  49. GRB 140305A: Swift detection of a burst
  50. GRB 140304A: RATIR g-band Dropout
  51. GRB 140304A: Swift-BAT refined analysis
  52. GRB 140304A: Swift-XRT refined Analysis
  53. GRB 140304A: Enhanced Swift-XRT position
  54. GRB 140304A: Redshift from the NOT
  55. GRB 140304A: Fermi GBM detection
  56. GRB 140304A: 10.4m GTC redshift z = 5.39
  57. GRB 140304A: NOT observations and redshift estimate
  58. GRB 140304A: Swift/UVOT Upper Limits
  59. GRB 140304A: Khureltogot optical observations
  60. GRB 140304A: Mondy optical observations
  61. GRB 140304A: Afterglow decay from Nanshan observations
  62. GRB 140304A: Swift detection of a burst
  63. GRB 140304A: MASTER OT detecton
  64. GRB 140301A: Swift/UVOT Upper Limits
  65. GRB 140302A: Swift/UVOT Upper Limits
  66. GRB 140302A: MITSuME Okayama upper limits
  67. GRB140302A: Fermi GBM detection
  68. GRB 140302A: Swift-XRT refined Analysis
  69. GRB 140302A: Swift-BAT refined analysis
  70. GRB 140302A: Enhanced Swift-XRT position
  71. GRB 140301A: Swift-BAT refined analysis
  72. GRB 140301A: Swift-XRT refined Analysis
  73. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  74. GRB 140302A: GROND afterglow candidate
  75. GRB 140302A: Prompt enhanced Swift-XRT position
  76. GRB 140302A: Swift detection of a burst
  77. GRB 140301A: VLT/X-shooter redshift
  78. GRB 140301A: NOT afterglow candidate
  79. GRB 140301A: Enhanced Swift-XRT position
  80. GRB 140301A: Skynet R-COP Observations
  81. GRB 140301A: Swift detection of a burst
  82. GRB 140226A/iPTF14yb: 1.23m CAHA observations
  83. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  84. GRB 140226A/iPTF14yb: Mondy optical observations
  85. GRB 140226A/iPTF14yb: RATIR Optical and NIR Observations
  86. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  87. GRB 140219A: Mondy optical observations of XRT source #5
  88. Konus-Wind observation of GRB 140226A
  89. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  90. PTF14yb: GROND Transient Detection
  91. GRB 140219A: Suzaku WAM observation of the prompt emission
  92. iPTF14yb: Swift-XRT detection
  93. GRB 140219A: MAXI/GSC detection
  94. GRB 140219A: the confirmation of the brightening SDSS J102406.41+062937.6 star
  95. GRB 140219A: Retraction of X-ray afterglow
  96. GRB 140219A: MASTER optical brightening inside XRT-5 error box detection
  97. GRB 140219A: iPTF optical observations
  98. GRB 140102A: TAOS early optical afterglow detection
  99. GRB 140219A: optical observations of XRT source #5
  100. GRB 140219A: XRT afterglow candidate

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