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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"

35259 results found.

  1. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  2. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  3. GRB 060109: Upper Limit on Host Galaxy
  4. GRB 060105: Upper limit on Host Galaxy
  5. GRB060614: Detection of the host galaxy but no supernova emission
  6. GRB 060614: redshift confirmation
  7. GRB 060614: Redshift
  8. Swift-BAT trigger 215279 is not a GRB
  9. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  10. GRB060614: Optical observations
  11. GRB 060614: spectroscopy
  12. GRB050326: Host Galaxy Candidates
  13. GRB050124: Possible Host Galaxy
  14. GRB050223: Host Galaxy
  15. GRB060512: near IR observations
  16. GRB060526: optical observations
  17. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  18. Konus-Wind observation of GRB 060614
  19. GRB060605: optical observation
  20. The Unusually Long-Lived Afterglow of GRB 060614
  21. GRB 060614: optical observations
  22. GRB 060605, optical observations
  23. GRB 060614, SMARTS optical/IR afterglow observation
  24. GRB060614: SSO 1m observations
  25. GRB060614: Watcher observation
  26. GRB 060614: Swift-BAT refined analysis
  27. GRB 060614: Swift/UVOT Observations
  28. GRB 060604, optical observations
  29. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  30. GRB 060602A: Swift/XRT analysis
  31. GRB 060610: KAIT observations
  32. GRB 060607: RTT150 optical observations
  33. GRB 070706B: Watcher upper limit
  34. GRB 060607B: Swift-BAT Refined Analysis
  35. GRB 060607B: Swift detection of a burst
  36. GCN 060607: Swift-UVOT obswervations.
  37. GRB 060607: Swift-BAT Refined Analysis
  38. GRB 060607: optical limit by "Pi of the Sky"
  39. GRB 060607: Swift-XRT Team refined analysis
  40. GRB 060607: IR observations
  41. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  42. VLT/UVES observations of GRB 060607
  43. GRB 060607: PROMPT Observations
  44. GRB 060605: RTT150 optical observations
  45. GRB 060607: REM NIR afterglow
  46. GRB 060607: Swift detection of a burst with bright optical counterpart
  47. GRB 060522: PROMPT Optical Limits
  48. GRB 060605 BAT refined analysis
  49. GRB 060605: Xinglong TNT optical observations
  50. GRB060602B : REM infrared observations
  51. GRB060605: Swift/UVOT detections
  52. GRB 060605: Swift-XRT Team refined analysis
  53. SALT spectroscopy of GRB 060605
  54. GRB 060605: TNG optical observations
  55. GRB 060605: RTT150 optical observations
  56. GRB 060605: ROTSE-III Optical Counterpart
  57. GRB 060605: Swift detection of a burst with optical counterpart
  58. GRB 060605: ROTSE-III Detection of Optical Counterpart
  59. GRB 060604: redshift
  60. GRB 060512: Keck Redshift
  61. GRB 060604 optical photometry
  62. GRB 060604: Swift-XRT Team refined analysis
  63. GRB 060604: BAT refined analysis
  64. GRB 060604A: ROTSE-III Optical Limits
  65. GRB 060604: Swift detection of a burst with possible optical counterpart
  66. GRB 060602A: Swift-BAT Refined Analysis: Correction
  67. GRB 060602B: XMM-Newton Survey Source
  68. GRB 060602B: Swift-XRT Refined Analysis
  69. GRB 060602B: Swift-BAT Refined Analysis
  70. GRB 060602B: Swift/UVOT observations
  71. GRB 060602A: Swift-BAT Refined Analysis
  72. GRB 060602B: RTT150 optical observations
  73. GRB 060211A : WIDGET simultaneous optical observations
  74. GRB060602A: optical observations(/transient?)
  75. GRB 060526: Tautenburg Second Epoch Observations
  76. GRB060602A: Bootes-IR observations
  77. GRB 060602B: Swift detection of a burst
  78. GRB060602B: Watcher observations - no OT candidate
  79. GRB060602B: BOOTES-IR candidate afterglow
  80. GRB060602 - SDSS Pre-Burst Observations
  81. GRB 060602: Swift detection of a burst
  82. GRB 060502A: Optical afterglow observations
  83. GRB 060526: Break in X-ray light curve
  84. GRB 060526: RTT150 optical observations
  85. GRB060526, optical observations
  86. GRB 051227 : WIDGET simultaneous optical observations
  87. GRB 051028 : WIDGET pre-trigger limit
  88. GRB 060526: RTT150 optical observations
  89. GRB 060526: Multiple Optical Flares
  90. GRB060526: afterglow fitting and probable jet break
  91. GRB 060526: RTT150 optical observations
  92. GRB060502b: optical observations
  93. GRB 060526: RTT150 optical observations
  94. GRB 060526: Tautenburg OT observation and light curve fitting
  95. GRB060526: optical observations
  96. GRB 060526: SMARTS optical/IR afterglow observations
  97. GRB 060526: REM observations
  98. GRB 060526: RTT150 optical observations, afterglow flattening
  99. GRB 060526: Optical Flare
  100. GRB 060526: MDM-2.4m Observations

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