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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"

14753 results found.

  1. GRB 140508A: NOT photometry and spectroscopy
  2. Konus-Wind observation of GRB 140506A
  3. Konus-Wind observation of GRB 140423A
  4. GRB 140430A: iTelescope.Net T16 Optical Observation
  5. GRB 140502A: Fermi GBM observation
  6. GRB 140430A: Further VATT Optical Observations
  7. GRB 140501A: Fermi GBM detection
  8. GRB 140430A: VATT Optical Observations
  9. GRB 140428A: GROND observations
  10. GRB 140428B: Fermi GBM observation
  11. Konus-Wind observation of GRB 140428B
  12. GRB 140428A: 1.5m OSN I-band detection
  13. GRB 140428A: Keck detection of a red optical afterglow candidate
  14. GRB 140428A: Swift Detection of a Possible Burst
  15. GRB 140423A: MITSuME Akeno Optical observation
  16. GRB 140423A: RATIR Optical and NIR Observations
  17. GRB 140423A: MITSuME Okayama Optical Observation
  18. GRB 140423A: Further Observations with Swift/UVOT
  19. GRB 140423A: Swift/UVOT detection of a possible counterpart
  20. GRB 140419A: KAIT Refined Analysis
  21. Konus-Wind observation of GRB 140419A
  22. GRB 140419A: MITSuME Ishigakijima Optical Observation
  23. GRB 140419A: MITSuME Okayama Optical Observation
  24. GRB 140419A: Swift UVOT refined analysis
  25. GRB 140419A: P60 Observations
  26. Konus-Wind observation of GRB 140416A
  27. GRB 140414A: Swift/UVOT Upper Limit
  28. GRB 140413A: Swift/UVOT Observations of the Optical Afterglow
  29. Konus-Wind observation of GRB 140413A
  30. GRB 140408A: 1.5m OSN optical upper limit
  31. Fermi418277210: iPTF optical observations
  32. GRB 140408A: RATIR Optical Upper Limits
  33. GRB 140408A: GROND Detection of an Afterglow Candidate
  34. GRB 140408A: Swift/UVOT Upper Limits
  35. GRB 140406A: Fermi GBM observation
  36. GRB 140331A: Continued RATIR Optical and NIR Observations
  37. GRB 140402A: Swift-XRT observations
  38. GRB 140402A BAT refined analysis
  39. GRB 140402A: Fermi-LAT detection of a burst
  40. GRB 140330A: Fermi GBM observation
  41. Retraction of the Fermi/LAT high-energy counterpart for GRB 140330A
  42. GRB 140330A: intense and persistent gamma-ray emission detected by AGILE
  43. GRB 140331A: Zadko observatory - Gingin optical observations
  44. Konus-Wind observation of GRB 140330A
  45. GRB 140331A: MITSuME Okayama upper limits
  46. GRB 140331A: RATIR Optical and NIR Observations
  47. GRB 140330A: Fermi-LAT Detection
  48. GRB 140329A: Fermi-LAT detection
  49. Konus-Wind observation of GRB 140329A
  50. GRB 140320D: Suzaku WAM observation of the prompt emission
  51. GRB 140323A : Suzaku WAM observation of the prompt emission
  52. GRB 140320C: Mondy optical observations and afterglow confirmation
  53. Konus-Wind observation of GRB 140323A
  54. GRB 140323A: Fermi-LAT detection
  55. GRB 140323A: Fermi GBM observation
  56. Konus-Wind observation of GRB 140320D
  57. GRB 140320B: P60 detection of a very red afterglow
  58. GRB 140320A: Swift-BAT refined analysis
  59. GRB 140320B: Swift-XRT detection of the afterglow
  60. GRB 140320C: A long GRB detected by INTEGRAL
  61. GRB 140320B: Xinglong TNT upper limit
  62. GRB 140320B: A long GRB detected by INTEGRAL
  63. GRB 140320A: Fermi GBM observations suggest a short GRB
  64. GRB 140318A: Continued RATIR Optical and NIR Observations
  65. GRB 140318A: Liverpool Telescope optical observations
  66. GRB 140318A: RATIR Optical and NIR Detections
  67. GRB140308A: Suzaku WAM observation of the prompt emission
  68. GRB 140311C: MASTER optical observations
  69. GRB 140311C: Swift-XRT and UVOT observations
  70. GRB 140311A: further NOT observations
  71. GRB 140311C: Fermi GBM Detection
  72. GRB 140311B: Fermi GBM Detection
  73. GRB 140311A: Kottamia I-band observation
  74. GRB 140311A: NOT redshift confirmation
  75. GRB 140311A: Enhanced Swift-XRT position
  76. GRB 140311A: Recalibration of photometry of OT detected with Kottamia 188cm telescope
  77. GRB 140311A: Nanshan afterglow decay
  78. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  79. GRB 140311A: NOT observations of the optical afterglow
  80. Konus-Wind observation of GRB 140308A
  81. GRB 140304A: Suzaku WAM observation of the prompt emission
  82. GRB 140306A: Suzaku WAM observation of the prompt emission
  83. Konus-Wind observation of GRB 140306A
  84. GRB 140304A: 10.4m GTC refined redshift z = 5.283
  85. GRB 140306A: Fermi GBM detection
  86. GRB 140304A: MASTER OT light curve
  87. GRB 140304A: RATIR g-band Dropout
  88. GRB 140304A: Redshift from the NOT
  89. GRB 140304A: Fermi GBM detection
  90. GRB 140304A: NOT observations and redshift estimate
  91. GRB 140304A: Swift/UVOT Upper Limits
  92. GRB 140304A: Khureltogot optical observations
  93. GRB 140304A: Mondy optical observations
  94. GRB 140302A: MITSuME Okayama upper limits
  95. GRB140302A: Fermi GBM detection
  96. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  97. GRB 140301A: NOT afterglow candidate
  98. GRB 140226A/iPTF14yb: RATIR Optical and NIR Observations
  99. Konus-Wind observation of GRB 140226A
  100. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb

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