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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"

23435 results found.

  1. GRB 090309: Swift/UVOT Upper Limits
  2. GRB090305B: Fermi GBM detection
  3. GRB 090309B: Fermi GBM detection
  4. GRB 090309: Enhanced Swift-XRT position
  5. GRB 090308: GROND observations
  6. GRB 090308: Gemini GMOS Observations
  7. GRB 090309: Swift detection of a burst
  8. GRB 090308B: Fermi GBM detection
  9. GRB 090308: Swift/UVOT Upper Limits
  10. GRB 090307B: Fermi GBM detection
  11. GRB 090306C: Fermi GBM detection
  12. GRB 090307: GROND Upper Limits
  13. GRB 090306B: GROND Upper Limits
  14. GRB 090308: Swift-XRT refined analysis
  15. GRB 090308: Swift detection of a burst
  16. GRB 090306B: Possible XRT afterglow
  17. GRB 090307: Swift-XRT afterglow confirmation and analysis
  18. Swift Trigger 345551 is probably not a GRB
  19. IPN localization of short GRB 090305C
  20. GRB 090306: Swift detection of a possible burst
  21. GRB 090305: Swift/UVOT Upper Limits
  22. GRB 090305: Swift-XRT refined analysis
  23. GRB090305: GMOS-S Candidate Optical Afterglow
  24. GRB 090305: Swift detection of a short burst
  25. GRB 090303: Fermi GBM detection
  26. GRB 090304: Fermi GBM detection
  27. Konus-RF catches first GRB and SGR bursts
  28. GRB 090228B: Fermi GBM detection
  29. IPN localization of short bright GRB 090227B
  30. GRB 090301B: Fermi GBM detection
  31. GRB 090227B: Fermi GBM detection
  32. GRB 090301: Swift detection of a burst
  33. GRB 090228: Fermi GBM detection
  34. GRB 090227: Fermi GBM detection
  35. GRB 090206: Fermi GBM detection
  36. GRB 081211B: Nearby cluster
  37. GRB 090222: Fermi GBM detection
  38. GRB 090219: Fermi GBM detection
  39. GRB090217: XRT analysis
  40. IPN localization of GRB 090217
  41. GRB 090213: Fermi GBM detection
  42. GRB 090217: Fermi GBM detection
  43. SGR activity seen by BAT during ICSP Ionospheric Events
  44. GRB 090207 - Fermi GBM Observations
  45. VLA radio upper limit on GRB 090205
  46. GRB 090205: VLT optical decay
  47. GRB 090205: Swift/UVOT Upper Limits
  48. GRB 090205: Swift-XRT refined analysis
  49. GRB 090205: GROND observations and photometric redshift estimate
  50. GRB 090205: VLT candidate afterglow
  51. GRB 090205: Swift-BAT refined analysis
  52. GRB 090205: Enhanced Swift-XRT position
  53. GRB 090205: Swift detection of a burst
  54. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  55. GRB 090202: Fermi GBM detection
  56. GRB 090131: Fermi GBM detection
  57. GRB090201: Swift UVOT upper limits
  58. GRB 090201: object inside the enhanced XRT error circle
  59. GRB 090201: Enhanced Swift-XRT position
  60. GRB 090201: VLT NIR observations
  61. GRB 090201: VLT afterglow candidate
  62. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  63. GRB 090201: ROTSE-III Optical Limits
  64. GRB 090201: Swift detection of a burst
  65. GRB 090126A: Swift/UVOT Upper Limits
  66. GRB 090129: Swift detection of a burst
  67. Suzaku ToO Observation of AXP 1E 1547.0-5408
  68. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  69. GRB 090102: HST observations and host galaxy
  70. GRB 090126C: Fermi GBM detection
  71. GRB 090126A: Swift-XRT Refined Analysis
  72. GRB 090126B: Fermi GBM detection
  73. GRB 090126: SuperAGILE Localization of a Long GRB
  74. GRB 090118: no afterglow candidate
  75. GRB 090123: GROND detection
  76. GRB 090123: Swift/UVOT Observations
  77. GRB 090123: Swift-BAT refined analysis
  78. GRB090123: Enhanced Swift-XRT position
  79. GRB 090123: Swift detection of a burst
  80. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  81. Trigger 340734: Swift detection of a possible short burst
  82. AXP 1E1547.0-5408 activity with SGR bursts
  83. GRB 090118: Subaru NIR Observation
  84. GRB 090118: KPNO 4m 2nd Epoch Observations
  85. GRB 090118 (BATSS): GRT Optical Observation
  86. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  87. GRB 090118: Swift-XRT observations
  88. GRB090118 Swift/UVOT upper limits
  89. GRB 090118: GROND Upper Limits
  90. GRB 090118: Possible burst detection from Swift-BAT slew data
  91. GRB 090117B : Fermi GBM detection
  92. GRB 090117C - Fermi GRB Detection
  93. GRB 090117: GROND Upper Limits
  94. GRB090117 Swift/UVOT upper limits
  95. GRB090117: Swift-XRT detection of a possible candidate afterglow
  96. GRB 090117 - SuperAGILE Localization of a long GRB
  97. GRB 090112B: Suzaku WAM observation of the prompt emission
  98. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  99. GRB 090113: Swift UVOT upper limits
  100. GRB 090113: GROND Upper Limits

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