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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"

21263 results found.

  1. GRB 060707: Refined analysis of the Swift-BAT burst
  2. GRB 060515: Upper Limit on Host Galaxy
  3. GRB 060109: Upper Limit on Host Galaxy
  4. GRB 060105: Upper limit on Host Galaxy
  5. GRB 060614: Redshift
  6. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  7. GRB050326: Host Galaxy Candidates
  8. GRB050124: Possible Host Galaxy
  9. GRB050223: Host Galaxy
  10. Konus-Wind observation of GRB 060614
  11. GRB060605: optical observation
  12. GRB 060605, optical observations
  13. GRB060614: SSO 1m observations
  14. GRB 060614: Swift-BAT refined analysis
  15. GRB 060614: Swift/UVOT Observations
  16. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  17. GRB 060602A: Swift/XRT analysis
  18. GRB 060610: KAIT observations
  19. GRB 060607: RTT150 optical observations
  20. GRB 060607B: Swift-BAT Refined Analysis
  21. GRB060602A: Swift/UVOT upper limits
  22. GRB 060607B: Swift detection of a burst
  23. GCN 060607: Swift-UVOT obswervations.
  24. GRB 060607: Swift-BAT Refined Analysis
  25. GRB 060607: IR observations
  26. VLT/UVES observations of GRB 060607
  27. GRB 060605: RTT150 optical observations
  28. GRB 060607: REM NIR afterglow
  29. GRB 060607: Swift detection of a burst with bright optical counterpart
  30. GRB 060522: PROMPT Optical Limits
  31. GRB 060605: Xinglong TNT optical observations
  32. GRB060602B : REM infrared observations
  33. GRB060605: Swift/UVOT detections
  34. GRB 060605: Swift-XRT Team refined analysis
  35. GRB 060605: RTT150 optical observations
  36. GRB060604: Swift/UVOT detections
  37. GRB 060604A: ROTSE-III Optical Limits
  38. GRB 060604: Swift detection of a burst with possible optical counterpart
  39. GRB 060602B: Swift/UVOT observations
  40. GRB 060602B: RTT150 optical observations
  41. GRB 060211A : WIDGET simultaneous optical observations
  42. GRB060602A: optical observations(/transient?)
  43. GRB 060602B: Swift detection of a burst
  44. GRB060602 - SDSS Pre-Burst Observations
  45. GRB 060502A: Optical afterglow observations
  46. GRB 060526: Break in X-ray light curve
  47. GRB060526, optical observations
  48. GRB 051227 : WIDGET simultaneous optical observations
  49. GRB 051028 : WIDGET pre-trigger limit
  50. GRB060526: Optical counterpart from MIRO
  51. GRB 060526: RTT150 optical observations
  52. GRB060526: optical observations
  53. GRB 060526: SMARTS optical/IR afterglow observations
  54. GRB 060526: REM observations
  55. GRB 060526: RTT150 optical observations, afterglow flattening
  56. GRB 060526: Refined analysis of the Swift-BAT burst
  57. GRB 060526: RTT150 optical observations
  58. GRB060526, optical observations
  59. GRB 060526: Watcher Observations
  60. GRB060526 - SDSS Pre-burst Observations
  61. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  62. GRB 060413 : WIDGET simultaneous optical observations
  63. XMM-Newton observation of GRB060510b
  64. GRB060512: Late-Time P200 Observations
  65. GRB 060522: Swift-BAT Refined Analysis
  66. GRB 060522: REM NIR observations
  67. GRB 060522: TNG optical observations
  68. GRB 060522: Swift detection of a burst with possible optical afterglow
  69. GRB 060515: NIR observation
  70. GRB060515: P200 NIR Observations
  71. GRB 060515 BAT refined analysis
  72. GRB 060512: TAROT optical observation
  73. GRB 060515: Swift/UVOT Upper Limits
  74. GRB 060515: Swift/XRT position
  75. GRB 060515: Super-LOTIS Observations
  76. GRB 060515: TAROT optical observation
  77. GRB 060515: ROTSE-III Optical Limits
  78. GRB 060515: Swift detection of a burst
  79. GRB 060512: Subaru NIR observation
  80. GRB060512: Swift XRT Team refined analysis
  81. GRB 060512: 1.54m Kuiper Observations
  82. GRB 060512: Detection of NIR afterglow
  83. GRB 060512: P60 Observations
  84. GRB 060512: REM NIR observations
  85. GRB060512 - SDSS Pre-Burst Observations
  86. GRB 060512: Swift detection of a burst with an optical afterglow
  87. GRB 060505: X-ray afterglow - Correction -
  88. GRB 060505: X-ray afterglow
  89. Konus-Wind observation of GRB 060510A
  90. GRB060418: optical observations
  91. GRB060510 - SDSS Pre-Burst Observations
  92. GRB 060510B: Super-LOTIS Observations
  93. GRB 060510B: Swift detection of a burst
  94. GRB 060510: Swift detection of a burst with optical transient
  95. GRB060507: optical afterglow detection
  96. GRB060502B: improvement in the XRT afterglow position
  97. GRB 060507: Swift-BAT Refined Analysis
  98. GRB 060505: PROMPT Observations
  99. GRB 060507: Swift/UVOT Upper Limits
  100. GRB 060507: Swift XRT Team Refined Analysis

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