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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"

41949 results found.

  1. GRB 140311A: NOT redshift confirmation
  2. GRB 140311B: Swift-XRT refined Analysis
  3. GRB 140311A: Swift-BAT refined analysis
  4. GRB 140311A: Gemini-South redshift
  5. GRB 140311B: final MASTER OT light curve
  6. GRB 140311A: Enhanced Swift-XRT position
  7. GRB 140311A: Recalibration of photometry of OT detected with Kottamia 188cm telescope
  8. GRB 140311A: Nanshan afterglow decay
  9. GRB 140311B: TAROT Calern observatory optical observations
  10. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  11. GRB 140311A: NOT observations of the optical afterglow
  12. GRB 140311A: Zadko observatory - Gingin optical observations
  13. GRB140311B: Swift/XRT position
  14. GRB 140311B: Nanshan afterglow detection
  15. GRB 140311B: MASTER early optical observations
  16. GRB 140311A: Nanshan OT detection
  17. GRB 140311A: MASTER early optical observations
  18. GRB 140311B: Swift detection of a burst
  19. GRB 140311A: Swift detection of a probable burst
  20. Konus-Wind observation of GRB 140308A
  21. GRB 140304A: Suzaku WAM observation of the prompt emission
  22. GRB 140306A: Suzaku WAM observation of the prompt emission
  23. Konus-Wind observation of GRB 140306A
  24. IPN Triangulation of GRB 140306A
  25. GRB 140304A: Continued RATIR Optical and NIR Observations
  26. GRB 140304A: 10.4m GTC refined redshift z = 5.283
  27. GRB 140306A: Fermi GBM detection
  28. GRB 140305A: Swift-BAT refined analysis
  29. GRB 140304A: MASTER OT light curve
  30. GRB 140304A: CARMA 3mm detection
  31. GRB 140304A: VLA Detection
  32. GRB 140305A: Swift detection of a burst
  33. GRB 140304A: RATIR g-band Dropout
  34. GRB 140304A: Swift-BAT refined analysis
  35. GRB 140304A: Swift-XRT refined Analysis
  36. GRB 140304A: Redshift from the NOT
  37. GRB 140304A: Fermi GBM detection
  38. GRB 140304A: 10.4m GTC redshift z = 5.39
  39. GRB 140304A: NOT observations and redshift estimate
  40. GRB 140304A: Swift/UVOT Upper Limits
  41. iPTF14yb: JVLA and CARMA observations
  42. GRB 140304A: Khureltogot optical observations
  43. GRB 140304A: Mondy optical observations
  44. GRB 140304A: Afterglow decay from Nanshan observations
  45. GRB 140304A: Swift detection of a burst
  46. GRB 140304A: MASTER OT detecton
  47. GRB 140301A: Swift/UVOT Upper Limits
  48. GRB 140302A: Swift/UVOT Upper Limits
  49. GRB 140302A: MITSuME Okayama upper limits
  50. GRB140302A: Fermi GBM detection
  51. GRB 140302A: Swift-XRT refined Analysis
  52. GRB 140302A: Swift-BAT refined analysis
  53. GRB 140301A: Swift-BAT refined analysis
  54. GRB 140301A: Swift-XRT refined Analysis
  55. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  56. GRB 140302A: GROND afterglow candidate
  57. GRB 140302A: Swift detection of a burst
  58. GRB 140301A: VLT/X-shooter redshift
  59. GRB 140301A: NOT afterglow candidate
  60. GRB 140301A: Skynet R-COP Observations
  61. GRB 140301A: Swift detection of a burst
  62. GRB 140226A/iPTF14yb: 1.23m CAHA observations
  63. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  64. GRB 140226A/iPTF14yb: Mondy optical observations
  65. GRB 140226A/iPTF14yb: RATIR Optical and NIR Observations
  66. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  67. GRB 140219A: Mondy optical observations of XRT source #5
  68. Konus-Wind observation of GRB 140226A
  69. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  70. PTF14yb: GROND Transient Detection
  71. iPTF14yb: RATIR Optical and NIR Observations of the optical transient
  72. GRB 140219A: Suzaku WAM observation of the prompt emission
  73. iPTF14yb: Swift-XRT detection
  74. iPTF14yb: iPTF Discovery of an Optical Afterglow-like Transient
  75. GRB 140219A: MAXI/GSC detection
  76. GRB 140219A: the confirmation of the brightening SDSS J102406.41+062937.6 star
  77. GRB 140219A: Retraction of X-ray afterglow
  78. GRB 140219A: MASTER optical brightening inside XRT-5 error box detection
  79. GRB 140219A: iPTF optical observations
  80. GRB 140102A: TAOS early optical afterglow detection
  81. GRB 140219A: optical observations of XRT source #5
  82. GRB 140219A: XRT afterglow candidate
  83. GRB 140221A: Results from Swift XRT tiled observations
  84. GRB 140219A: Xuyi and Nanshan upper limits
  85. GRB 140219A: results from Swift XRT and UVOT tiled observations
  86. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  87. Konus-Wind observation of exceptionally bright GRB 140219A
  88. GRB 140221A Tiled Swift observations
  89. GRB 140221A: MAXI/GSC detection
  90. GRB 140219A: Fermi-LAT detection of a burst
  91. GRB 140219A: Fermi GBM Detection
  92. GRB 140219A Tiled Swift observations
  93. Swift follow-up of an Integral weak transient
  94. GRB 140213A: Continued Skynet R-COP/PROMPT Observations of the Optical Afterglow
  95. GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
  96. Fermi GBM trigger 140214230 is not a GRB
  97. GRB 140213A: Continued Skynet R-COP/PROMPT Detections of a Rebrightening Optical Afterglow
  98. GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
  99. GRB 140215A: WSRT radio observation
  100. GRB 140211A: Khureltogot optical upper limits

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