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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"

36155 results found.

  1. GRB 060614: spectroscopy
  2. GRB050326: Host Galaxy Candidates
  3. GRB050124: Possible Host Galaxy
  4. GRB050223: Host Galaxy
  5. GRB060512: near IR observations
  6. GRB060526: optical observations
  7. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  8. Konus-Wind observation of GRB 060614
  9. GRB060605: optical observation
  10. The Unusually Long-Lived Afterglow of GRB 060614
  11. GRB 060614: optical observations
  12. GRB 060605, optical observations
  13. GRB 060614, SMARTS optical/IR afterglow observation
  14. GRB060614: SSO 1m observations
  15. GRB060614: Watcher observation
  16. GRB 060614: Swift-BAT refined analysis
  17. GRB 060614: Swift/UVOT Observations
  18. GRB 060604, optical observations
  19. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  20. GRB 060602A: Swift/XRT analysis
  21. GRB 060610: KAIT observations
  22. GRB 060607: RTT150 optical observations
  23. GRB 070706B: Watcher upper limit
  24. GRB 060607B: Swift-BAT Refined Analysis
  25. GRB 060607B: Swift detection of a burst
  26. GCN 060607: Swift-UVOT obswervations.
  27. GRB 060607: Swift-BAT Refined Analysis
  28. GRB 060607: optical limit by "Pi of the Sky"
  29. GRB 060607: Swift-XRT Team refined analysis
  30. GRB 060607: IR observations
  31. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  32. VLT/UVES observations of GRB 060607
  33. GRB 060607: PROMPT Observations
  34. GRB 060605: RTT150 optical observations
  35. GRB 060607: REM NIR afterglow
  36. GRB 060607: Swift detection of a burst with bright optical counterpart
  37. GRB 060522: PROMPT Optical Limits
  38. GRB 060605 BAT refined analysis
  39. GRB 060605: Xinglong TNT optical observations
  40. GRB060602B : REM infrared observations
  41. GRB060605: Swift/UVOT detections
  42. GRB 060605: Swift-XRT Team refined analysis
  43. SALT spectroscopy of GRB 060605
  44. GRB 060605: TNG optical observations
  45. GRB 060605: RTT150 optical observations
  46. GRB 060605: ROTSE-III Optical Counterpart
  47. GRB 060605: Swift detection of a burst with optical counterpart
  48. GRB 060605: ROTSE-III Detection of Optical Counterpart
  49. GRB 060604: redshift
  50. GRB 060512: Keck Redshift
  51. GRB 060604 optical photometry
  52. GRB 060604: Swift-XRT Team refined analysis
  53. GRB 060604: BAT refined analysis
  54. GRB 060604A: ROTSE-III Optical Limits
  55. GRB 060604: Swift detection of a burst with possible optical counterpart
  56. GRB 060602A: Swift-BAT Refined Analysis: Correction
  57. GRB 060602B: XMM-Newton Survey Source
  58. GRB 060602B: Swift-XRT Refined Analysis
  59. GRB 060602B: Swift-BAT Refined Analysis
  60. GRB 060602B: Swift/UVOT observations
  61. GRB 060602A: Swift-BAT Refined Analysis
  62. GRB 060602B: RTT150 optical observations
  63. GRB 060211A : WIDGET simultaneous optical observations
  64. GRB060602A: optical observations(/transient?)
  65. GRB 060526: Tautenburg Second Epoch Observations
  66. GRB060602A: Bootes-IR observations
  67. GRB 060602B: Swift detection of a burst
  68. GRB060602B: Watcher observations - no OT candidate
  69. GRB060602B: BOOTES-IR candidate afterglow
  70. GRB060602 - SDSS Pre-Burst Observations
  71. GRB 060602: Swift detection of a burst
  72. GRB 060502A: Optical afterglow observations
  73. GRB 060526: Break in X-ray light curve
  74. GRB 060526: RTT150 optical observations
  75. GRB060526, optical observations
  76. GRB 051227 : WIDGET simultaneous optical observations
  77. GRB 051028 : WIDGET pre-trigger limit
  78. GRB 060526: RTT150 optical observations
  79. GRB 060526: Multiple Optical Flares
  80. GRB060526: afterglow fitting and probable jet break
  81. GRB 060526: RTT150 optical observations
  82. GRB060502b: optical observations
  83. GRB 060526: RTT150 optical observations
  84. GRB 060526: Tautenburg OT observation and light curve fitting
  85. GRB060526: optical observations
  86. GRB 060526: SMARTS optical/IR afterglow observations
  87. GRB 060526: REM observations
  88. GRB 060526: RTT150 optical observations, afterglow flattening
  89. GRB 060526: Optical Flare
  90. GRB 060526: MDM-2.4m Observations
  91. GRB 060526: Refined analysis of the Swift-BAT burst
  92. GRB 060526: RTT150 optical observations
  93. GRB060526, optical observations
  94. GRB 060526: Magellan Redshift
  95. GRB 060526 Lulin optical observation
  96. GRB 060526: Swift/XRT Team refined analysis
  97. GRB 060526: TNG optical observations
  98. GRB 060526: ROTSE-III Observations of Optical Counterpart
  99. GRB 060526: Watcher Observations
  100. GRB060526 - SDSS Pre-burst Observations

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