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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"

25559 results found.

  1. GRB 090313: Swift detection of a burst
  2. GRB090310: Fermi GBM detection
  3. GRB 090205: Zadko Telescope late-time observations
  4. GRB 090307A: TAROT Calern observatory optical observations
  5. GRB090305B: Fermi GBM detection
  6. GRB 090309B: Fermi GBM detection
  7. GRB 090309: Swift-XRT refined analysis
  8. GRB 090309: Enhanced Swift-XRT position
  9. GRB 090306B: INTEGRAL SPI-ACS light curve
  10. GRB 090309, Swift-BAT refined analysis
  11. GRB 090308: GROND observations
  12. GRB 090308: Gemini GMOS Observations
  13. GRB 090309: Swift detection of a burst
  14. GRB 090308B: Fermi GBM detection
  15. GRB 090307B: Fermi GBM detection
  16. GRB 090306C: Fermi GBM detection
  17. GRB 090307: GROND Upper Limits
  18. GRB 090306B: GROND Upper Limits
  19. GRB 090305C: Suzaku WAM observation of the prompt emission
  20. GRB 090308: Swift-XRT refined analysis
  21. Radio observation of GRB 090201 with ATCA
  22. Radio observation of GRB 090117 with ATCA
  23. Radio observation of GRB 081226b with ATCA
  24. Radio observation of GRB 081226a with ATCA
  25. Radio observation of GRB 081007 with ATCA
  26. ATCA observation of SGR J1550-5418
  27. GRB 090308: Swift-BAT refined analysis
  28. GRB 090308: Swift detection of a burst
  29. GRB 090307: Swift-XRT afterglow confirmation and analysis
  30. GRB 090307: Swift-BAT refined analysis of trigger 345551
  31. GRB 090306B: Burst detection from Swift-BAT slew data
  32. Swift Trigger 345551 is probably not a GRB
  33. Fermi GBM trigger 090305784 is not a GRB
  34. GRB 090306: Swift detection of a possible burst
  35. GRB 090305: Swift/UVOT Upper Limits
  36. GRB 090305: Swift-XRT refined analysis
  37. GRB 090305, Swift-BAT refined analysis
  38. GRB 090227A: Suzaku WAM observation of the prompt emission
  39. GRB 090305: Magellan confirmation of the optical afterglow
  40. GRB090305: GMOS-S Candidate Optical Afterglow
  41. GRB 090305: Swift detection of a short burst
  42. GRB 090304: Fermi GBM detection
  43. GRB 090301A: Suzaku WAM observation of the prompt emission
  44. Konus-RF catches first GRB and SGR bursts
  45. GRB 090228B: Fermi GBM detection
  46. Konus-Wind observation of bright short GRB 090227B
  47. IPN localization of short bright GRB 090227B
  48. Konus-Wind observation of GRB 090301A
  49. GRB 090301A: Swift-BAT refined analysis
  50. GRB 090301B: Fermi GBM detection
  51. GRB 090227B: Fermi GBM detection
  52. GRB 090301: Swift detection of a burst
  53. GRB 090228: Fermi GBM detection
  54. GRB 090227: Fermi GBM detection
  55. GRB 090206: Fermi GBM detection
  56. SGR J1550-5418
  57. GRB 081211B: Nearby cluster
  58. Ongoing activity of AXP/SGR 1E1547.0-5408
  59. GRB 090222: Fermi GBM detection
  60. GRB 090219: Fermi GBM detection
  61. GRB 090217: Suzaku WAM observation of the prompt emission
  62. GRB090217: XRT analysis
  63. Konus-Wind observation of GRB 090217
  64. IPN localization of GRB 090217
  65. GRB090217: Fermi-LAT Detection
  66. GRB 090217: Fermi GBM detection
  67. SGR activity seen by BAT during ICSP Ionospheric Events
  68. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  69. GRB 090207 - Fermi GBM Observations
  70. GRB 090129: Fermi GBM detection
  71. VLA radio upper limit on GRB 090205
  72. GRB 090205: VLT optical decay
  73. GRB 090205: Swift/UVOT Upper Limits
  74. GRB 090205: Swift-XRT refined analysis
  75. GRB 090205: Swift burst of interest
  76. GRB 090205: VLT spectroscopic redshift
  77. GRB 090205: GROND observations and photometric redshift estimate
  78. GRB 090205: Swift-BAT refined analysis
  79. GRB 090205: Enhanced Swift-XRT position
  80. GRB 090205: Swift detection of a burst
  81. GRB 090131: Suzaku WAM observation of the prompt emission
  82. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  83. GRB 090126A: Swift-XRT afterglow confirmation
  84. Konus-Wind observation of GRB 090201
  85. GRB 090202: Fermi GBM detection
  86. GRB 090131: Fermi GBM detection
  87. GRB 090201: Swift-XRT refined analysis
  88. GRB 090201: Enhanced Swift-XRT position
  89. GRB 090201: VLT NIR observations
  90. GRB 090201: Swift-BAT refined analysis
  91. GRB 090201: Swift detection of a burst
  92. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  93. GRB 090129: Swift-BAT refined analysis
  94. GRB 090129: Swift detection of a burst
  95. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  96. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  97. GRB 090126A: Swift-XRT Refined Analysis
  98. GRB 090126B: Fermi GBM detection
  99. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  100. GRB 090118: no afterglow candidate

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