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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"

32536 results found.

  1. GRB 060614: Swift/UVOT Observations
  2. GRB060614: Swift-XRT refined analysis
  3. GRB 060604, optical observations
  4. GRB 060602A: Swift/XRT analysis
  5. BAT Trigger #214277 is SGR 1900+14
  6. GRB 070706B: Watcher upper limit
  7. GRB 060607B: Swift-BAT Refined Analysis
  8. GRB060602A: Swift/UVOT upper limits
  9. GCN 060607: Swift-UVOT obswervations.
  10. GRB 060607: Swift-BAT Refined Analysis
  11. GRB 060607: Swift-XRT Team refined analysis
  12. GRB 060607: IR observations
  13. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  14. VLT/UVES observations of GRB 060607
  15. GRB 060607: PROMPT Observations
  16. GRB 060607: REM NIR afterglow
  17. GRB 060522: PROMPT Optical Limits
  18. GRB 060605 BAT refined analysis
  19. GRB 060605: Xinglong TNT optical observations
  20. GRB060602B : REM infrared observations
  21. GRB060605: Swift/UVOT detections
  22. GRB 060605: Swift-XRT Team refined analysis
  23. SALT spectroscopy of GRB 060605
  24. GRB 060605: TNG optical observations
  25. GRB 060605: RTT150 optical observations
  26. GRB060605: Spectral Observations and Redshift
  27. GRB 060605: ROTSE-III Optical Counterpart
  28. GRB 060605: ROTSE-III Detection of Optical Counterpart
  29. GRB060604: Swift/UVOT detections
  30. GRB 060604: redshift
  31. GRB 060512: Keck Redshift
  32. GRB 060604 optical photometry
  33. GRB 060604: Swift-XRT Team refined analysis
  34. GRB 060604: BAT refined analysis
  35. GRB 060604A: ROTSE-III Optical Limits
  36. GRB 060602A: Swift-BAT Refined Analysis: Correction
  37. GRB 060602B: XMM-Newton Survey Source
  38. GRB 060602B: Swift-XRT Refined Analysis
  39. GRB 060602B: Swift-BAT Refined Analysis
  40. GRB 060602B: Swift/UVOT observations
  41. GRB 060602A: Swift-BAT Refined Analysis
  42. GRB 060211A : WIDGET simultaneous optical observations
  43. GRB060602A: optical observations(/transient?)
  44. GRB 060526: Tautenburg Second Epoch Observations
  45. GRB060602A: Bootes-IR observations
  46. GRB 060602B: Swift detection of a burst
  47. GRB060602B: Watcher observations - no OT candidate
  48. GRB060602B: BOOTES-IR candidate afterglow
  49. GRB 060502A: Optical afterglow observations
  50. GRB 060526: Break in X-ray light curve
  51. GRB 060526: RTT150 optical observations
  52. GRB060526, optical observations
  53. GRB 051227 : WIDGET simultaneous optical observations
  54. GRB 051028 : WIDGET pre-trigger limit
  55. GRB 060526: RTT150 optical observations
  56. GRB 060526: Multiple Optical Flares
  57. GRB060526: afterglow fitting and probable jet break
  58. GRB 060526: RTT150 optical observations
  59. GRB060526: Optical counterpart from MIRO
  60. GRB060502b: optical observations
  61. GRB 060526: RTT150 optical observations
  62. GRB 060526: Tautenburg OT observation and light curve fitting
  63. GRB060526: optical observations
  64. GRB 060526: SMARTS optical/IR afterglow observations
  65. GRB060526: possible break in the optical light curve
  66. GRB 060526: REM observations
  67. GRB 060526: RTT150 optical observations, afterglow flattening
  68. GRB 060526: Optical Flare
  69. GRB 060526: MDM-2.4m Observations
  70. GRB 060526: Refined analysis of the Swift-BAT burst
  71. GRB 060526: RTT150 optical observations
  72. GRB060526: Further Swift-UVOT Observations
  73. GRB 060526: Magellan Redshift
  74. GRB 060526: Swift/XRT Team refined analysis
  75. GRB 060526: TNG optical observations
  76. GRB 060526: ROTSE-III Observations of Optical Counterpart
  77. GRB 060526: Watcher Observations
  78. GRB060526 - SDSS Pre-burst Observations
  79. GRB 060526: Continued emission for the Swift burst
  80. GRB060505: VLT observations of the optical afterglow
  81. GRB 060413 : WIDGET simultaneous optical observations
  82. GRB 060522: Swift/UVOT Observations: Correction
  83. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  84. XMM-Newton observation of GRB060510b
  85. GRB060512: Late-Time P200 Observations
  86. GRB060522: z = 5.11 Keck-LRIS Redshift
  87. GRB 060522: Swift/XRT Team refined analysis
  88. GRB 060522: Swift-BAT Refined Analysis
  89. GRB 060522: REM NIR observations
  90. GRB 060522: TNG optical observations
  91. GRB 060512: reanalysis of optical spectra
  92. GRB 060515: NIR observation
  93. GRB 060210: Jet Break in the XRT light curve
  94. GRB 060516: Refined analysis of the Swift-BAT burst
  95. GRB 060512: TNG optical spectroscopy
  96. GRB060515: P200 NIR Observations
  97. GRB 060505 BAT refined analysis
  98. GRB 060515 BAT refined analysis
  99. GRB 060515: Swift/XRT Team refined analysis
  100. GRB 060515: Swift/UVOT Upper Limits

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