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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"

36124 results found.

  1. GRB 090323: TLS detection at 5 days, no break
  2. GRB 090327: Fermi GBM detection
  3. GRB 090323: Faulkes Telescope South Observations
  4. GRB 090320B: MASTER-Net prompt optical observations
  5. GRB 090323: RTT150 optical observations
  6. GRB 090323: Lick observations
  7. GRB 090323: Fermi GBM Spectral Analysis
  8. GRB 090323: Optical observation of xinglong TNT
  9. GRB 090323 TLS detection - still bright
  10. GRB 090323: UVOT Detection of Afterglow
  11. GRB 090323: Swift-XRT refined analysis
  12. Konus-Wind observation of GRB 090323
  13. GRB 090324: SuperAGILE Localization of a Long GRB
  14. GRB 090323 Gemini-South Redshift
  15. GRB 090323: P60 Afterglow Confirmation
  16. GRB 090323: GROND Detection of the Afterglow and Photo-z
  17. GRB 090323: Possible XRT Counterpart
  18. IPN triangulation of GRB090323
  19. GRB 090320C: Fermi GBM Detection
  20. Fermi GBM and LAT detections of GRB 090323
  21. GRB 090320B: Fermi GBM detection.
  22. GRB 090319: Fermi GBM detection
  23. GRB 090320A: Fermi GBM detection
  24. GRB 090313: WSRT Radio Detection
  25. X-shooter observations of GRB 090313
  26. GRB 090315: Suzaku WAM observation of the prompt emission
  27. GRB 090313: VLT spectroscopy
  28. GRB090313: radio detection with the VLA
  29. Konus-Wind observation of GRB 090315
  30. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  31. GRB 090313, SMARTS optical/IR observations
  32. Further radio observation of GRB 090313
  33. Further Swift/UVOT observations of GRB 090313
  34. GRB 090313: detection with CARMA in 3mm band
  35. GRB090305B: MASTER-net prompt optical short burst observations
  36. Radio detection of GRB090313
  37. GRB 090313: MITSuME Okayama observation
  38. GRB 090313: Additional Gemini-S photometry
  39. GRB 090313: WSRT Radio Observations
  40. GRB 090313: Light curve steepening
  41. GRB 090313: TAROT La Silla observatory optical detection
  42. GRB 090313: Gemini-S photometry
  43. GRB 090313: Zadko Telescope observations
  44. GRB 090313 - PAIRITEL NIR detections
  45. GRB 090313: Gemini-S redshift
  46. GRB 090313 optical observations
  47. GRB 090313: Ongoing plateau phase
  48. GRB 090313: Swift-XRT refined analysis
  49. GRB 090313: Swift/UVOT upper limits
  50. GRB 090313: Faulkes Telescope North observations
  51. GRB 090313: Sustained optical brightness (correction)
  52. GRB 090306B: Confirmation of the X-ray afterglow
  53. GRB 090313: Swift-BAT refined analysis
  54. GRB 090313: Sustained optical brightness
  55. GRB 090313: SDSS object underlying the optical afterglow position
  56. GRB 090313, GROND observations
  57. GRB 090309, Swift-BAT lag analysis
  58. GRB 090313: Swift detection of a burst
  59. GRB 090313: Swift detection of a burst
  60. GRB 090313 OA candidate
  61. Swift trigger 346250 is probably not a burst
  62. GRB090310: Fermi GBM detection
  63. GRB 090205: Zadko Telescope late-time observations
  64. GRB 090309A: GROND upper limits
  65. GRB 090307A: TAROT Calern observatory optical observations
  66. GRB 090309: Swift/UVOT Upper Limits
  67. GRB090305B: Fermi GBM detection
  68. GRB 090309B: Fermi GBM detection
  69. GRB 090309: Swift-XRT refined analysis
  70. GRB 090309: Enhanced Swift-XRT position
  71. GRB 090306B: INTEGRAL SPI-ACS light curve
  72. GRB 090309, Swift-BAT refined analysis
  73. GRB 090308: GROND observations
  74. GRB 090308: Gemini GMOS Observations
  75. GRB 090309: Swift detection of a burst
  76. GRB 090308B: Fermi GBM detection
  77. GRB 090308: Swift/UVOT Upper Limits
  78. GRB 090307B: Fermi GBM detection
  79. GRB 090306C: Fermi GBM detection
  80. GRB 090307: GROND Upper Limits
  81. GRB 090306B: GROND Upper Limits
  82. GRB 090305C: Suzaku WAM observation of the prompt emission
  83. GRB 090308: Swift-XRT refined analysis
  84. Radio observation of GRB 090201 with ATCA
  85. Radio observation of GRB 090117 with ATCA
  86. Radio observation of GRB 081226b with ATCA
  87. Radio observation of GRB 081226a with ATCA
  88. Radio observation of GRB 081007 with ATCA
  89. GRB 090308: Swift-BAT refined analysis
  90. GRB 090308: Swift detection of a burst
  91. GRB 090306B: Possible XRT afterglow
  92. GRB 090307: Swift-XRT afterglow confirmation and analysis
  93. GRB 090307: Swift-BAT refined analysis of trigger 345551
  94. GRB 090306B: Burst detection from Swift-BAT slew data
  95. Swift Trigger 345551 is probably not a GRB
  96. Swift-BAT trigger 345396 is not a GRB
  97. IPN localization of short GRB 090305C
  98. Fermi GBM trigger 090305784 is not a GRB
  99. GRB 090306: Swift detection of a possible burst
  100. GRB 090305: Swift/UVOT Upper Limits

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