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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"

21018 results found.

  1. GRB 090418A: RTT150 optical observations
  2. GRB 090422: Liverpool Telescope observations
  3. Swift-BAT trigger 349718 is not a burst
  4. GRB 090418B: GRAS002 observatios
  5. GRB 090418A: optical observations
  6. GRB 090418B: GROND observations
  7. GRB 090419: Swift/UVOT Observations
  8. GRB 090418B: Faulkes Telescope North observations
  9. GRB 090418A: Swift/UVOT Observations
  10. GRB 090419: GROND detection of afterglow candidate
  11. GRB 090418: Optical observations with MITSuME Okayama and Ishigaki 1m telescope
  12. GRB 090419: Swift-BAT refined analysis
  13. VLA observations of short burst GRB 090417A
  14. GRB 090417B: Gemini imaging
  15. GRB 090417B: Galaxy redshift
  16. GRB 090418 OA candidate
  17. GRB 090417B: Subaru NIR Observations
  18. GRB 090417B: Liverpool Telescope observations
  19. GRB090417B: Xinglong TNT optical upper limit
  20. GRB 090417B: optical observations
  21. GRB090417B: optical observations
  22. GRB 090410: GROND upper limits
  23. Konus-Wind and Konus-RF observations of GRB 090408b
  24. GRB090408 : TAOS optical observations
  25. Swift-BAT Trigger 348781 is not a GRB
  26. Swift-BAT Trigger 348720 is not a GRB
  27. GRB 090408: Xinglong TNT optical Upper Limit
  28. GRB 090408B: MASTER II-Kourovka optical observations
  29. GRB 090407: GROND upper limits
  30. GRB 090407: VLT observations
  31. Konus-Wind and Konus-RF observations of GRB 090406
  32. GRB 090407: Swift detection of a burst
  33. GRB 090404: millimeter detection
  34. GRB 090404: nIR observations at Calar Alto
  35. GRB 090404: GROND upper limits
  36. GRB 090404: further NOT observations
  37. Swift/UVOT observations of GRB090404
  38. GRB 090404: NOT observations
  39. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  40. GRB 090404: Xinglong TNT optical Upper Limit
  41. GRB 090401B: Xinglong TNT optical Upper Limit
  42. GRB 090401B: NOT optical observations
  43. Swift/UVOT observations of GRB090401B
  44. Swift/UVOT observations of GRB090401B
  45. AGILE Gamma-ray detection of GRB 090401B
  46. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  47. GRB 090323: Further TLS detections - a break?
  48. GRB 090328: Radio afterglow detection
  49. GRB 090328: BOOTES-3 optical observations
  50. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  51. GRB 090328: Gemini South Redshift
  52. GRB090323: Optical observations from NOT
  53. GRB 090328: Swift UVOT observations
  54. GRB 090323: WSRT Radio Detection
  55. Fermi LAT and GBM detections of GRB090328
  56. GRB 090323: Radio afterglow detection
  57. GRB 090323: Additional Lick observations
  58. GRB 090323: TLS detection at 5 days, no break
  59. GRB 090323: Faulkes Telescope South Observations
  60. GRB 090320B: MASTER-Net prompt optical observations
  61. GRB 090323: RTT150 optical observations
  62. GRB 090323: Lick observations
  63. GRB 090323: Optical observation of xinglong TNT
  64. GRB 090323 TLS detection - still bright
  65. GRB 090323: UVOT Detection of Afterglow
  66. GRB 090323 Gemini-South Redshift
  67. GRB 090323: P60 Afterglow Confirmation
  68. GRB 090323: GROND Detection of the Afterglow and Photo-z
  69. Further 15GHz observations of GRB090313
  70. GRB 090313: WSRT Radio Detection
  71. X-shooter observations of GRB 090313
  72. GRB 090313, SMARTS optical/IR observations
  73. Further Swift/UVOT observations of GRB 090313
  74. GRB090305B: MASTER-net prompt optical short burst observations
  75. GRB 090313: Additional Gemini-S photometry
  76. GRB 090313: WSRT Radio Observations
  77. GRB 090313: Light curve steepening
  78. GRB 090313: TAROT La Silla observatory optical detection
  79. GRB 090313: Zadko Telescope observations
  80. GRB 090313 - PAIRITEL NIR detections
  81. GRB 090313: Gemini-S redshift
  82. GRB 090313 optical observations
  83. GRB 090313: Ongoing plateau phase
  84. GRB 090313: Swift/UVOT upper limits
  85. GRB 090313: Faulkes Telescope North observations
  86. GRB 090313: Sustained optical brightness (correction)
  87. GRB 090306B: Confirmation of the X-ray afterglow
  88. GRB 090313: Sustained optical brightness
  89. GRB 090313, GROND observations
  90. GRB 090205: Zadko Telescope late-time observations
  91. GRB 090309A: GROND upper limits
  92. GRB 090307A: TAROT Calern observatory optical observations
  93. GRB 090308: GROND observations
  94. GRB 090308: Gemini GMOS Observations
  95. GRB 090307: GROND Upper Limits
  96. GRB 090306B: GROND Upper Limits
  97. ATCA observation of SGR J1550-5418
  98. GRB 090306B: Possible XRT afterglow
  99. GRB 090307: Swift-BAT refined analysis of trigger 345551
  100. GRB 090305: Magellan confirmation of the optical afterglow

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