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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"

20979 results found.

  1. GRB 060719: VLT observations
  2. GRB 060719: LCO optical observations
  3. GRB060714: optical observations
  4. GRB 060717: NOT observations
  5. GRB060717 - SDSS Pre-burst Observations
  6. GRB 060714: REM infrared observations
  7. GRB060714: optical observations
  8. GRB 060714 : Liverpool Telescope Observations
  9. GRB 060708: VLT spectroscopy
  10. GRB060708: MARGE low resolution spectrum observations
  11. GRB060714: optical observations
  12. GRB 060605: SkyNet Optical Limits
  13. GRB060712: P60 Observations
  14. GRB 060712: Swift/UVOT Upper Limits
  15. GRB060526: optical observations
  16. GCN 060708: Swift-UVOT Observations
  17. GCN 060707: Swift-UVOT observations
  18. GRB 060707: BOOTES-IR optical observation
  19. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  20. GRB 050223: Magellan redshift
  21. GRB 060614: SMARTS host galaxy observations
  22. GRB 060614: Redshift
  23. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  24. GRB060614: Optical observations
  25. GRB 060614: spectroscopy
  26. GRB060512: near IR observations
  27. GRB060526: optical observations
  28. The Unusually Long-Lived Afterglow of GRB 060614
  29. GRB 060614: optical observations
  30. GRB 060605, optical observations
  31. GRB060614: SSO 1m observations
  32. GRB060614: Watcher observation
  33. GRB 060614: Swift/UVOT Observations
  34. GRB 060604, optical observations
  35. GRB 060610: KAIT observations
  36. GRB 060607: RTT150 optical observations
  37. GRB 060607: IR observations
  38. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  39. VLT/UVES observations of GRB 060607
  40. GRB 060607: PROMPT Observations
  41. GRB 060605: RTT150 optical observations
  42. GRB 060607: REM NIR afterglow
  43. GRB 060605: Xinglong TNT optical observations
  44. GRB060602B : REM infrared observations
  45. GRB060605: Swift/UVOT detections
  46. GRB 060605: TNG optical observations
  47. GRB 060605: RTT150 optical observations
  48. GRB060605: Spectral Observations and Redshift
  49. GRB 060605: ROTSE-III Optical Counterpart
  50. GRB 060605: ROTSE-III Detection of Optical Counterpart
  51. GRB 060604: redshift
  52. GRB 060512: Keck Redshift
  53. GRB 060602B: Swift-BAT Refined Analysis
  54. GRB 060602B: Swift/UVOT observations
  55. GRB 060602B: RTT150 optical observations
  56. GRB 060211A : WIDGET simultaneous optical observations
  57. GRB060602A: optical observations(/transient?)
  58. GRB 060526: Tautenburg Second Epoch Observations
  59. GRB060602A: Bootes-IR observations
  60. GRB060602B: Watcher observations - no OT candidate
  61. GRB060602B: BOOTES-IR candidate afterglow
  62. GRB060602 - SDSS Pre-Burst Observations
  63. GRB 060502A: Optical afterglow observations
  64. GRB 060526: RTT150 optical observations
  65. GRB060526, optical observations
  66. GRB 051227 : WIDGET simultaneous optical observations
  67. GRB 060526: RTT150 optical observations
  68. GRB 060526: Multiple Optical Flares
  69. GRB 060526: RTT150 optical observations
  70. GRB060502b: optical observations
  71. GRB 060526: RTT150 optical observations
  72. GRB060526: optical observations
  73. GRB 060526: SMARTS optical/IR afterglow observations
  74. GRB 060526: REM observations
  75. GRB 060526: RTT150 optical observations, afterglow flattening
  76. GRB 060526: Optical Flare
  77. GRB 060526: MDM-2.4m Observations
  78. GRB 060526: RTT150 optical observations
  79. GRB060526: Further Swift-UVOT Observations
  80. GRB060526, optical observations
  81. GRB 060526: Magellan Redshift
  82. GRB 060526: TNG optical observations
  83. GRB 060526: ROTSE-III Observations of Optical Counterpart
  84. GRB 060526: Watcher Observations
  85. GRB060526 - SDSS Pre-burst Observations
  86. GRB 060526: Continued emission for the Swift burst
  87. GRB060505: VLT observations of the optical afterglow
  88. GRB 060413 : WIDGET simultaneous optical observations
  89. GRB 060522: Swift/UVOT Observations: Correction
  90. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  91. GRB060512: Late-Time P200 Observations
  92. GRB 060522: REM NIR observations
  93. GRB 060522: TNG optical observations
  94. GRB060515: P200 NIR Observations
  95. GRB 060512: TAROT optical observation
  96. GRB 060515: Super-LOTIS Observations
  97. Swift/UVOT observations of GRB060512.
  98. GRB 060512: Subaru NIR observation
  99. GRB 060512: 1.54m Kuiper Observations
  100. GRB 060512: Detection of NIR afterglow

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