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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"

21093 results found.

  1. Swift-BAT Trigger 348720 is not a GRB
  2. GRB 090408: Xinglong TNT optical Upper Limit
  3. GRB 090408B: MASTER II-Kourovka optical observations
  4. GRB 090407: GROND upper limits
  5. GRB 090407: VLT observations
  6. Konus-Wind and Konus-RF observations of GRB 090406
  7. GRB 090407: Swift detection of a burst
  8. GRB 090404: millimeter detection
  9. GRB 090404: nIR observations at Calar Alto
  10. GRB 090404: GROND upper limits
  11. GRB 090404: further NOT observations
  12. Swift/UVOT observations of GRB090404
  13. GRB 090404: NOT observations
  14. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  15. GRB 090404: Xinglong TNT optical Upper Limit
  16. GRB 090401B: Xinglong TNT optical Upper Limit
  17. GRB 090401B: NOT optical observations
  18. Swift/UVOT observations of GRB090401B
  19. Swift/UVOT observations of GRB090401B
  20. AGILE Gamma-ray detection of GRB 090401B
  21. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  22. GRB 090323: Further TLS detections - a break?
  23. GRB 090328: Radio afterglow detection
  24. GRB 090328: BOOTES-3 optical observations
  25. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  26. GRB 090328: Gemini South Redshift
  27. GRB090323: Optical observations from NOT
  28. GRB 090328: Swift UVOT observations
  29. GRB 090323: WSRT Radio Detection
  30. Fermi LAT and GBM detections of GRB090328
  31. GRB 090323: Radio afterglow detection
  32. GRB 090323: Additional Lick observations
  33. GRB 090323: TLS detection at 5 days, no break
  34. GRB 090323: Faulkes Telescope South Observations
  35. GRB 090320B: MASTER-Net prompt optical observations
  36. GRB 090323: RTT150 optical observations
  37. GRB 090323: Lick observations
  38. GRB 090323: Optical observation of xinglong TNT
  39. GRB 090323 TLS detection - still bright
  40. GRB 090323: UVOT Detection of Afterglow
  41. GRB 090323 Gemini-South Redshift
  42. GRB 090323: P60 Afterglow Confirmation
  43. GRB 090323: GROND Detection of the Afterglow and Photo-z
  44. Further 15GHz observations of GRB090313
  45. GRB 090313: WSRT Radio Detection
  46. X-shooter observations of GRB 090313
  47. GRB 090313, SMARTS optical/IR observations
  48. Further Swift/UVOT observations of GRB 090313
  49. GRB090305B: MASTER-net prompt optical short burst observations
  50. GRB 090313: Additional Gemini-S photometry
  51. GRB 090313: WSRT Radio Observations
  52. GRB 090313: Light curve steepening
  53. GRB 090313: TAROT La Silla observatory optical detection
  54. GRB 090313: Zadko Telescope observations
  55. GRB 090313 - PAIRITEL NIR detections
  56. GRB 090313: Gemini-S redshift
  57. GRB 090313 optical observations
  58. GRB 090313: Ongoing plateau phase
  59. GRB 090313: Swift/UVOT upper limits
  60. GRB 090313: Faulkes Telescope North observations
  61. GRB 090313: Sustained optical brightness (correction)
  62. GRB 090306B: Confirmation of the X-ray afterglow
  63. GRB 090313: Sustained optical brightness
  64. GRB 090313, GROND observations
  65. GRB 090205: Zadko Telescope late-time observations
  66. GRB 090309A: GROND upper limits
  67. GRB 090307A: TAROT Calern observatory optical observations
  68. GRB 090308: GROND observations
  69. GRB 090308: Gemini GMOS Observations
  70. GRB 090307: GROND Upper Limits
  71. GRB 090306B: GROND Upper Limits
  72. ATCA observation of SGR J1550-5418
  73. GRB 090306B: Possible XRT afterglow
  74. GRB 090307: Swift-BAT refined analysis of trigger 345551
  75. GRB 090305: Magellan confirmation of the optical afterglow
  76. GRB090305: GMOS-S Candidate Optical Afterglow
  77. SGR J1550-5418
  78. GRB 081211B: Nearby cluster
  79. GRB 090207 - Fermi GBM Observations
  80. GRB 090205: VLT optical decay
  81. GRB 090205: Swift/UVOT Upper Limits
  82. GRB 090205: GROND observations and photometric redshift estimate
  83. GRB 090205: VLT candidate afterglow
  84. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  85. GRB090201: Swift UVOT upper limits
  86. GRB 090201: object inside the enhanced XRT error circle
  87. GRB 090201: VLT NIR observations
  88. GRB 090201: VLT afterglow candidate
  89. GRB090113: MAGIC telescope GeV observation
  90. Suzaku ToO Observation of AXP 1E 1547.0-5408
  91. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  92. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  93. GRB 090102: HST observations and host galaxy
  94. GRB 090118: no afterglow candidate
  95. 1E1547.0-5408: Swift detection of dust halo
  96. GRB 090123: Swift/UVOT Observations
  97. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  98. AXP 1E1547.0-5408: Fermi GBM observations
  99. GRB 090118: KPNO 4m 2nd Epoch Observations
  100. GRB 090118: KPNO 4m Detection of Candidate Afterglow

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