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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

20521 results found.

  1. GRB 060602B: Swift detection of a burst
  2. GRB060602B: Watcher observations - no OT candidate
  3. GRB060602 - SDSS Pre-Burst Observations
  4. GRB 060502A: Optical afterglow observations
  5. GRB 060526: Break in X-ray light curve
  6. GRB060526, optical observations
  7. GRB 051227 : WIDGET simultaneous optical observations
  8. GRB 051028 : WIDGET pre-trigger limit
  9. GRB060526: Optical counterpart from MIRO
  10. GRB 060526: RTT150 optical observations
  11. GRB060526: optical observations
  12. GRB 060526: REM observations
  13. GRB 060526: RTT150 optical observations, afterglow flattening
  14. GRB 060526: RTT150 optical observations
  15. GRB060526, optical observations
  16. GRB 060526: TNG optical observations
  17. GRB 060526: Watcher Observations
  18. GRB060526 - SDSS Pre-burst Observations
  19. GRB 060526: Continued emission for the Swift burst
  20. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  21. GRB060505: VLT observations of the optical afterglow
  22. GRB 060413 : WIDGET simultaneous optical observations
  23. XMM-Newton observation of GRB060510b
  24. GRB060512: Late-Time P200 Observations
  25. GRB 060522: Swift/XRT Team refined analysis
  26. GRB 060522: REM NIR observations
  27. GRB 060522: TNG optical observations
  28. GRB 060515: NIR observation
  29. GRB060515: P200 NIR Observations
  30. GRB 060505 BAT refined analysis
  31. GRB 060515 BAT refined analysis
  32. GRB 060512: TAROT optical observation
  33. GRB 060515: Swift/XRT Team refined analysis
  34. GRB 060515: Swift/UVOT Upper Limits
  35. GRB 060515: Swift/XRT position
  36. GRB 060515: Super-LOTIS Observations
  37. GRB 060515: TAROT optical observation
  38. GRB 060512: Subaru NIR observation
  39. GRB 060512: 1.54m Kuiper Observations
  40. GRB 060512: Detection of NIR afterglow
  41. GRB 060512: P60 Observations
  42. GRB 060512: Swift-BAT Refined Analysis
  43. GRB 060505 - OT candidate + galaxy spectrum
  44. GRB 060512: REM NIR observations
  45. GRB060512 - SDSS Pre-Burst Observations
  46. GRB 060512: Swift detection of a burst with an optical afterglow
  47. GRB 060505: X-ray afterglow - Correction -
  48. GRB 060505: X-ray afterglow
  49. GRB060418: optical observations
  50. GRB060510 - SDSS Pre-Burst Observations
  51. GRB 060510B: Swift detection of a burst
  52. GRB 060510: Swift detection of a burst with optical transient
  53. GRB060507: optical afterglow detection
  54. GRB060502B: improvement in the XRT afterglow position
  55. GRB 060505: PROMPT Observations
  56. GRB 060507: Swift XRT Team Refined Analysis
  57. GRB060505: Swift/UVOT Observations
  58. GRB060425: new MASTER survey method
  59. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  60. GRB 060505: Swift XRT afterglow canditate position
  61. GRB 060502b: Second epoch Gemini observations
  62. GRB 060505: Swift-BAT detection of a weak burst
  63. GRB 060428B: spectroscopy
  64. GRB 060502B: optical observations
  65. GRB 060502B: AROMA refined photometric calibration
  66. GRB 060502B MDM Follow-up Observation
  67. GRB 060502b: Gemini imaging and spectroscopy
  68. GRB060502A, optical observation
  69. GRB 060502B: Swift/UVOT upper limits
  70. GRB 060502A: Swift/UVOT source detection
  71. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  72. GRB 060502B: Refined analysis of the Swift-BAT short burst
  73. GRB060502B: Swift XRT Team refined analysis
  74. GRB 060501: P60 Observations and Candidate Retraction
  75. GRB 060502B: Xinglong optical observation
  76. GRB060501: Swift UVOT followup observations
  77. GRB 060502: P60 Afterglow Confirmation
  78. GRB 060502: Swift detection of a burst with an optical counterpart
  79. GRB060501: P60 imaging and afterglow candidate
  80. GRB 060501: Refined analysis of the Swift-BAT burst
  81. GRB060428B - SDSS Pre-Burst Observations
  82. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  83. GRB 060428A: PROMPT Observations
  84. GRB060428B: Swift XRT Team refined analysis
  85. GRB 060427B: IPN localization of a short hard burst
  86. GRB 060428B: Xinglong I-band limit
  87. GRB 051117A: Bright host galaxy not confirmed
  88. GRB060428A: Swift/UVOT observations.
  89. GRB060428B, optical observation
  90. GRB 060428b : Kiso R-band limit
  91. GRB 060428b: Optical afterglow candidate
  92. GRB 060428B: Swift detection of a burst
  93. GRB 060427: NIR observations
  94. GRB060427: Xinglong optical Observations
  95. GRB 060428: Swift detection of a burst
  96. GRB 060427: Swift/UVOT upper limits.
  97. GRB060427: Swift XRT Team refined analysis
  98. GRB060418: Swift XRT Team Further Refined Analysis
  99. GRB 060427, optical observation
  100. GRB 060427: Swift detection of a burst

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