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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"

25044 results found.

  1. GRB 060714: Swift XRT refined analysis
  2. GRB 060708: VLT spectroscopy
  3. Swift trigger 219136 is probably not a GRB
  4. GRB 060714, optical observation
  5. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  6. GRB060712: P60 Observations
  7. GRB 060712: XRT refined analysis
  8. GRB 060712: Swift/UVOT Upper Limits
  9. GRB060526: optical observations
  10. GRB 060712: XRT refined position
  11. GRB 060712: Refined analysis of the Swift-BAT burst
  12. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  13. GRB 060707: OA fading and redshift
  14. GRB 060708: Swift-XRT refined analysis
  15. GCN 060708: Swift-UVOT Observations
  16. GRB 060708: Refined analysis of the Swift-BAT burst
  17. GCN 060707: Swift-UVOT observations
  18. GRB 060707: Swift-XRT refined analysis
  19. GRB 060708: Swift detection of a burst with an UVOT countpart
  20. GRB 060707: Refined analysis of the Swift-BAT burst
  21. GRB 060707: BOOTES-IR optical observation
  22. GRB 060515: Upper Limit on Host Galaxy
  23. GRB 060614: SMARTS host galaxy observations
  24. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  25. GRB 060109: Upper Limit on Host Galaxy
  26. GRB 060105: Upper limit on Host Galaxy
  27. GRB 060614: Redshift
  28. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  29. GRB050326: Host Galaxy Candidates
  30. GRB050124: Possible Host Galaxy
  31. GRB050223: Host Galaxy
  32. Konus-Wind observation of GRB 060614
  33. GRB060605: optical observation
  34. GRB 060614: optical observations
  35. GRB 060605, optical observations
  36. GRB 060614: Swift-BAT refined analysis
  37. GRB 060614: Swift/UVOT Observations
  38. GRB060614: Swift-XRT refined analysis
  39. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  40. GRB 060602A: Swift/XRT analysis
  41. BAT Trigger #214277 is SGR 1900+14
  42. GRB 060610: KAIT observations
  43. GRB 060607: RTT150 optical observations
  44. GRB 060607B: Swift-BAT Refined Analysis
  45. GRB060602A: Swift/UVOT upper limits
  46. GRB 060607B: Swift detection of a burst
  47. GCN 060607: Swift-UVOT obswervations.
  48. GRB 060607: Swift-BAT Refined Analysis
  49. GRB 060607: Swift-XRT Team refined analysis
  50. GRB 060607: IR observations
  51. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  52. GRB 060605: RTT150 optical observations
  53. GRB 060607: REM NIR afterglow
  54. GRB 060607: Swift detection of a burst with bright optical counterpart
  55. GRB 060522: PROMPT Optical Limits
  56. GRB 060605 BAT refined analysis
  57. GRB 060605: Xinglong TNT optical observations
  58. GRB060602B : REM infrared observations
  59. GRB060605: Swift/UVOT detections
  60. GRB 060605: Swift-XRT Team refined analysis
  61. GRB 060605: RTT150 optical observations
  62. GRB 060605: Swift detection of a burst with optical counterpart
  63. GRB060604: Swift/UVOT detections
  64. GRB 060604: Swift-XRT Team refined analysis
  65. GRB 060604: BAT refined analysis
  66. GRB 060604A: ROTSE-III Optical Limits
  67. GRB 060604: Swift detection of a burst with possible optical counterpart
  68. GRB 060602A: Swift-BAT Refined Analysis: Correction
  69. GRB 060602B: Swift-XRT Refined Analysis
  70. GRB 060602B: Swift-BAT Refined Analysis
  71. GRB 060602B: Swift/UVOT observations
  72. GRB 060602A: Swift-BAT Refined Analysis
  73. GRB 060211A : WIDGET simultaneous optical observations
  74. GRB060602A: optical observations(/transient?)
  75. GRB 060602B: Swift detection of a burst
  76. GRB060602B: BOOTES-IR candidate afterglow
  77. GRB060602 - SDSS Pre-Burst Observations
  78. GRB 060502A: Optical afterglow observations
  79. GRB 060526: Break in X-ray light curve
  80. GRB060526, optical observations
  81. GRB 051227 : WIDGET simultaneous optical observations
  82. GRB 051028 : WIDGET pre-trigger limit
  83. GRB060526: Optical counterpart from MIRO
  84. GRB 060526: RTT150 optical observations
  85. GRB060526: optical observations
  86. GRB 060526: REM observations
  87. GRB 060526: RTT150 optical observations, afterglow flattening
  88. GRB 060526: MDM-2.4m Observations
  89. GRB 060526: Refined analysis of the Swift-BAT burst
  90. GRB 060526: RTT150 optical observations
  91. GRB060526, optical observations
  92. GRB 060526: Swift/XRT Team refined analysis
  93. GRB 060526: ROTSE-III Observations of Optical Counterpart
  94. GRB 060526: Watcher Observations
  95. GRB060526 - SDSS Pre-burst Observations
  96. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  97. GRB 060413 : WIDGET simultaneous optical observations
  98. XMM-Newton observation of GRB060510b
  99. GRB060512: Late-Time P200 Observations
  100. GRB 060522: Swift-BAT Refined Analysis

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