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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"

32723 results found.

  1. GRB 090323: RTT150 optical observations
  2. GRB 090323: Lick observations
  3. GRB 090323: Fermi GBM Spectral Analysis
  4. GRB 090323: Optical observation of xinglong TNT
  5. GRB 090323 TLS detection - still bright
  6. GRB 090323: UVOT Detection of Afterglow
  7. GRB 090323: Swift-XRT refined analysis
  8. Konus-Wind observation of GRB 090323
  9. GRB 090323 Gemini-South Redshift
  10. GRB 090323: P60 Afterglow Confirmation
  11. GRB 090323: GROND Detection of the Afterglow and Photo-z
  12. SGR J1550-5418: two Fermi GBM triggers on March 22
  13. GRB 090323: Possible XRT Counterpart
  14. IPN triangulation of GRB090323
  15. Further 15GHz observations of GRB090313
  16. GRB 090313: WSRT Radio Detection
  17. X-shooter observations of GRB 090313
  18. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  19. GRB 090315: Suzaku WAM observation of the prompt emission
  20. GRB 090313: VLT spectroscopy
  21. GRB090313: radio detection with the VLA
  22. Konus-Wind observation of GRB 090315
  23. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  24. GRB 090313, SMARTS optical/IR observations
  25. Further Swift/UVOT observations of GRB 090313
  26. GRB 090313: detection with CARMA in 3mm band
  27. GRB090305B: MASTER-net prompt optical short burst observations
  28. Radio detection of GRB090313
  29. GRB 090313: MITSuME Okayama observation
  30. GRB 090313: Additional Gemini-S photometry
  31. GRB 090313: WSRT Radio Observations
  32. GRB 090313: Gemini-S photometry
  33. GRB 090313: Zadko Telescope observations
  34. GRB 090313 - PAIRITEL NIR detections
  35. GRB 090313: Gemini-S redshift
  36. GRB 090313 optical observations
  37. GRB 090313: Ongoing plateau phase
  38. GRB 090313: Swift-XRT refined analysis
  39. GRB 090313: Swift/UVOT upper limits
  40. GRB 090313: Faulkes Telescope North observations
  41. GRB 090313: Sustained optical brightness (correction)
  42. GRB 090306B: Confirmation of the X-ray afterglow
  43. GRB 090313: Swift-BAT refined analysis
  44. GRB 090313: Sustained optical brightness
  45. GRB 090313: SDSS object underlying the optical afterglow position
  46. GRB 090313, GROND observations
  47. GRB 090309, Swift-BAT lag analysis
  48. GRB 090205: Zadko Telescope late-time observations
  49. GRB 090309A: GROND upper limits
  50. GRB 090309: Swift/UVOT Upper Limits
  51. GRB 090309: Swift-XRT refined analysis
  52. GRB 090306B: INTEGRAL SPI-ACS light curve
  53. GRB 090309, Swift-BAT refined analysis
  54. GRB 090308: GROND observations
  55. GRB 090308: Gemini GMOS Observations
  56. GRB 090308: Swift/UVOT Upper Limits
  57. GRB 090307: GROND Upper Limits
  58. GRB 090306B: GROND Upper Limits
  59. GRB 090305C: Suzaku WAM observation of the prompt emission
  60. GRB 090308: Swift-XRT refined analysis
  61. Radio observation of GRB 090201 with ATCA
  62. Radio observation of GRB 090117 with ATCA
  63. Radio observation of GRB 081226b with ATCA
  64. Radio observation of GRB 081226a with ATCA
  65. Radio observation of GRB 081007 with ATCA
  66. ATCA observation of SGR J1550-5418
  67. GRB 090308: Swift-BAT refined analysis
  68. GRB 090306B: Possible XRT afterglow
  69. GRB 090307: Swift-XRT afterglow confirmation and analysis
  70. GRB 090307: Swift-BAT refined analysis of trigger 345551
  71. Swift Trigger 345551 is probably not a GRB
  72. GRB 090305: Swift/UVOT Upper Limits
  73. GRB 090305: Swift-XRT refined analysis
  74. GRB 090305, Swift-BAT refined analysis
  75. GRB 090227A: Suzaku WAM observation of the prompt emission
  76. GRB 090305: Magellan confirmation of the optical afterglow
  77. GRB090305: GMOS-S Candidate Optical Afterglow
  78. GRB 090301A: Suzaku WAM observation of the prompt emission
  79. Konus-RF catches first GRB and SGR bursts
  80. Konus-Wind observation of bright short GRB 090227B
  81. IPN localization of short bright GRB 090227B
  82. Konus-Wind observation of GRB 090301A
  83. GRB 090301A: Swift-BAT refined analysis
  84. SGR J1550-5418
  85. GRB 081211B: Nearby cluster
  86. GRB 090217: Suzaku WAM observation of the prompt emission
  87. GRB090217: XRT analysis
  88. Konus-Wind observation of GRB 090217
  89. IPN localization of GRB 090217
  90. GRB090217: Fermi-LAT Detection
  91. SGR activity seen by BAT during ICSP Ionospheric Events
  92. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  93. VLA radio upper limit on GRB 090205
  94. GRB 090205: VLT optical decay
  95. GRB 090205: Swift/UVOT Upper Limits
  96. GRB 090205: VLT refined redshift
  97. GRB 090205: Swift-XRT refined analysis
  98. GRB 090205: VLT spectroscopic redshift
  99. GRB 090205: GROND observations and photometric redshift estimate
  100. GRB 090205: VLT candidate afterglow

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