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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"

25476 results found.

  1. Further Swift/UVOT observations of GRB 090313
  2. GRB 090313: detection with CARMA in 3mm band
  3. GRB090305B: MASTER-net prompt optical short burst observations
  4. GRB 090313: Additional Gemini-S photometry
  5. GRB 090313: Light curve steepening
  6. GRB 090313: TAROT La Silla observatory optical detection
  7. GRB 090313: Gemini-S photometry
  8. GRB 090313 optical observations
  9. GRB 090313: Ongoing plateau phase
  10. GRB 090313: Swift-XRT refined analysis
  11. GRB 090313: Swift/UVOT upper limits
  12. GRB 090313: Faulkes Telescope North observations
  13. GRB 090306B: Confirmation of the X-ray afterglow
  14. GRB 090313: Swift-BAT refined analysis
  15. GRB 090313: SDSS object underlying the optical afterglow position
  16. GRB 090313, GROND observations
  17. GRB 090313: Swift detection of a burst
  18. GRB 090313: Swift detection of a burst
  19. GRB090310: Fermi GBM detection
  20. GRB 090205: Zadko Telescope late-time observations
  21. GRB 090307A: TAROT Calern observatory optical observations
  22. GRB090305B: Fermi GBM detection
  23. GRB 090309B: Fermi GBM detection
  24. GRB 090309: Swift-XRT refined analysis
  25. GRB 090309: Enhanced Swift-XRT position
  26. GRB 090306B: INTEGRAL SPI-ACS light curve
  27. GRB 090309, Swift-BAT refined analysis
  28. GRB 090308: GROND observations
  29. GRB 090308: Gemini GMOS Observations
  30. GRB 090309: Swift detection of a burst
  31. GRB 090308B: Fermi GBM detection
  32. GRB 090307B: Fermi GBM detection
  33. GRB 090306C: Fermi GBM detection
  34. GRB 090307: GROND Upper Limits
  35. GRB 090306B: GROND Upper Limits
  36. GRB 090305C: Suzaku WAM observation of the prompt emission
  37. GRB 090308: Swift-XRT refined analysis
  38. Radio observation of GRB 090201 with ATCA
  39. Radio observation of GRB 090117 with ATCA
  40. Radio observation of GRB 081226b with ATCA
  41. Radio observation of GRB 081226a with ATCA
  42. Radio observation of GRB 081007 with ATCA
  43. ATCA observation of SGR J1550-5418
  44. GRB 090308: Swift-BAT refined analysis
  45. GRB 090308: Swift detection of a burst
  46. GRB 090307: Swift-XRT afterglow confirmation and analysis
  47. GRB 090307: Swift-BAT refined analysis of trigger 345551
  48. GRB 090306B: Burst detection from Swift-BAT slew data
  49. Swift Trigger 345551 is probably not a GRB
  50. Fermi GBM trigger 090305784 is not a GRB
  51. GRB 090306: Swift detection of a possible burst
  52. GRB 090305: Swift/UVOT Upper Limits
  53. GRB 090305: Swift-XRT refined analysis
  54. GRB 090305, Swift-BAT refined analysis
  55. GRB 090227A: Suzaku WAM observation of the prompt emission
  56. GRB 090305: Magellan confirmation of the optical afterglow
  57. GRB090305: GMOS-S Candidate Optical Afterglow
  58. GRB 090305: Swift detection of a short burst
  59. GRB 090304: Fermi GBM detection
  60. GRB 090301A: Suzaku WAM observation of the prompt emission
  61. Konus-RF catches first GRB and SGR bursts
  62. GRB 090228B: Fermi GBM detection
  63. Konus-Wind observation of bright short GRB 090227B
  64. IPN localization of short bright GRB 090227B
  65. Konus-Wind observation of GRB 090301A
  66. GRB 090301A: Swift-BAT refined analysis
  67. GRB 090301B: Fermi GBM detection
  68. GRB 090227B: Fermi GBM detection
  69. GRB 090301: Swift detection of a burst
  70. GRB 090228: Fermi GBM detection
  71. GRB 090227: Fermi GBM detection
  72. GRB 090206: Fermi GBM detection
  73. SGR J1550-5418
  74. GRB 081211B: Nearby cluster
  75. Ongoing activity of AXP/SGR 1E1547.0-5408
  76. GRB 090222: Fermi GBM detection
  77. GRB 090219: Fermi GBM detection
  78. GRB 090217: Suzaku WAM observation of the prompt emission
  79. GRB090217: XRT analysis
  80. Konus-Wind observation of GRB 090217
  81. IPN localization of GRB 090217
  82. GRB090217: Fermi-LAT Detection
  83. GRB 090217: Fermi GBM detection
  84. SGR activity seen by BAT during ICSP Ionospheric Events
  85. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  86. GRB 090207 - Fermi GBM Observations
  87. GRB 090129: Fermi GBM detection
  88. VLA radio upper limit on GRB 090205
  89. GRB 090205: VLT optical decay
  90. GRB 090205: Swift/UVOT Upper Limits
  91. GRB 090205: Swift-XRT refined analysis
  92. GRB 090205: Swift burst of interest
  93. GRB 090205: VLT spectroscopic redshift
  94. GRB 090205: GROND observations and photometric redshift estimate
  95. GRB 090205: Swift-BAT refined analysis
  96. GRB 090205: Enhanced Swift-XRT position
  97. GRB 090205: Swift detection of a burst
  98. GRB 090131: Suzaku WAM observation of the prompt emission
  99. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  100. GRB 090126A: Swift-XRT afterglow confirmation

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