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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"

11527 results found.

  1. GRB 090326: Fermi GBM detection
  2. GRB 090328: BOOTES-3 optical observations
  3. GRB 090328: Fermi GBM Spectral Analysis
  4. GRB 090328B: Fermi GBM Detection
  5. GRB 090330: Fermi GBM detection
  6. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  7. GRB 090328: Gemini South Redshift
  8. GRB 090328: Swift XRT refined analysis
  9. Konus-Wind observation of GRB 090328
  10. GRB 090328: IPN Triangulation
  11. GRB 090328: Swift UVOT observations
  12. Fermi LAT and GBM detections of GRB090328
  13. GRB 090323: Radio afterglow detection
  14. GRB 090323: TLS detection at 5 days, no break
  15. GRB 090327: Fermi GBM detection
  16. GRB 090323: Faulkes Telescope South Observations
  17. GRB 090320B: MASTER-Net prompt optical observations
  18. GRB 090323: Fermi GBM Spectral Analysis
  19. GRB 090323 TLS detection - still bright
  20. GRB 090323: UVOT Detection of Afterglow
  21. GRB 090323: Swift-XRT refined analysis
  22. Konus-Wind observation of GRB 090323
  23. GRB 090323: GROND Detection of the Afterglow and Photo-z
  24. SGR J1550-5418: two Fermi GBM triggers on March 22
  25. GRB 090323: Possible XRT Counterpart
  26. IPN triangulation of GRB090323
  27. GRB 090320C: Fermi GBM Detection
  28. Fermi GBM and LAT detections of GRB 090323
  29. GRB 090320B: Fermi GBM detection.
  30. GRB 090319: Fermi GBM detection
  31. GRB 090320A: Fermi GBM detection
  32. GRB090305B: MASTER-net prompt optical short burst observations
  33. GRB090310: Fermi GBM detection
  34. GRB090305B: Fermi GBM detection
  35. GRB 090309B: Fermi GBM detection
  36. GRB 090308B: Fermi GBM detection
  37. GRB 090307B: Fermi GBM detection
  38. GRB 090306C: Fermi GBM detection
  39. Fermi GBM trigger 090305784 is not a GRB
  40. GRB 090303: Fermi GBM detection
  41. GRB 090304: Fermi GBM detection
  42. Konus-RF catches first GRB and SGR bursts
  43. GRB 090228B: Fermi GBM detection
  44. Konus-Wind observation of bright short GRB 090227B
  45. IPN localization of short bright GRB 090227B
  46. GRB 090301B: Fermi GBM detection
  47. GRB 090227B: Fermi GBM detection
  48. GRB 090228: Fermi GBM detection
  49. GRB 090227: Fermi GBM detection
  50. GRB 090206: Fermi GBM detection
  51. SGR J1550-5418
  52. Ongoing activity of AXP/SGR 1E1547.0-5408
  53. GRB 090222: Fermi GBM detection
  54. GRB 090219: Fermi GBM detection
  55. GRB 090217: Suzaku WAM observation of the prompt emission
  56. Konus-Wind observation of GRB 090217
  57. IPN localization of GRB 090217
  58. GRB 090213: Fermi GBM detection
  59. GRB090217: Fermi-LAT Detection
  60. GRB 090217: Fermi GBM detection
  61. SGR activity seen by BAT during ICSP Ionospheric Events
  62. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  63. GRB 090207 - Fermi GBM Observations
  64. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  65. GRB 090129: Fermi GBM detection
  66. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  67. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  68. GRB 090202: Fermi GBM detection
  69. GRB 090131: Fermi GBM detection
  70. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  71. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  72. GRB 090126C: Fermi GBM detection
  73. GRB 090126B: Fermi GBM detection
  74. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  75. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  76. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  77. AXP 1E1547.0-5408: Fermi GBM observations
  78. AXP 1E1547.0-5408 activity with SGR bursts
  79. GRB 090117B : Fermi GBM detection
  80. GRB 090117C - Fermi GRB Detection
  81. GRB 090117 - Fermi GBM Observations
  82. GRB 090112B: Fermi GBM Detection
  83. GRB 090113: Swift detection of a burst
  84. GRB 090112: Fermi GBM detection
  85. GRB 090109: Fermi GBM detection
  86. GRB 090108B: Fermi GBM detection
  87. GRB 090108: Fermi GBM Detection
  88. GRB090107B: Fermi GBM Detection
  89. Fermi/GBM detection of GRB 081226A
  90. Fermi/GBM detection of GRB 081225
  91. GRB 081231: Fermi GBM Detection
  92. GRB 081229: Fermi GBM detection
  93. GRB 081226B: Fermi GBM observation
  94. GRB 081226C: Fermi GBM detection
  95. GRB 081224: Suzaku WAM observation of the prompt emission
  96. GRB 081224: Swift-XRT observation
  97. GRB 081224: Fermi GBM Detection & LAT Localization
  98. GRB 081223: Fermi GBM detection
  99. GRB 081221: GROND observations
  100. GRB 081222: Fermi GBM observation

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