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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"

19569 results found.

  1. GRB 060602A: Swift/XRT analysis
  2. GRB 060610: KAIT observations
  3. GRB 060607: RTT150 optical observations
  4. GRB060602A: Swift/UVOT upper limits
  5. GRB 060607B: Swift detection of a burst
  6. GCN 060607: Swift-UVOT obswervations.
  7. GRB 060607: IR observations
  8. GRB 060605: RTT150 optical observations
  9. GRB 060607: REM NIR afterglow
  10. GRB 060607: Swift detection of a burst with bright optical counterpart
  11. GRB 060605: Xinglong TNT optical observations
  12. GRB060602B : REM infrared observations
  13. GRB060605: Swift/UVOT detections
  14. GRB 060605: RTT150 optical observations
  15. GRB060604: Swift/UVOT detections
  16. GRB 060604A: ROTSE-III Optical Limits
  17. GRB 060604: Swift detection of a burst with possible optical counterpart
  18. GRB 060602B: XMM-Newton Survey Source
  19. GRB 060602B: Swift/UVOT observations
  20. GRB060602A: optical observations(/transient?)
  21. GRB 060602B: Swift detection of a burst
  22. GRB060602 - SDSS Pre-Burst Observations
  23. GRB 060502A: Optical afterglow observations
  24. GRB 060526: Break in X-ray light curve
  25. GRB060526, optical observations
  26. GRB 051227 : WIDGET simultaneous optical observations
  27. GRB 051028 : WIDGET pre-trigger limit
  28. GRB060526: Optical counterpart from MIRO
  29. GRB 060526: RTT150 optical observations
  30. GRB060526: optical observations
  31. GRB 060526: REM observations
  32. GRB 060526: RTT150 optical observations, afterglow flattening
  33. GRB 060526: RTT150 optical observations
  34. GRB060526, optical observations
  35. GRB 060526: Watcher Observations
  36. GRB060526 - SDSS Pre-burst Observations
  37. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  38. GRB 060413 : WIDGET simultaneous optical observations
  39. XMM-Newton observation of GRB060510b
  40. GRB060512: Late-Time P200 Observations
  41. GRB 060522: REM NIR observations
  42. GRB 060522: TNG optical observations
  43. GRB 060515: NIR observation
  44. GRB060515: P200 NIR Observations
  45. GRB 060505 BAT refined analysis
  46. GRB 060515 BAT refined analysis
  47. GRB 060512: TAROT optical observation
  48. GRB 060515: Swift/UVOT Upper Limits
  49. GRB 060515: Swift/XRT position
  50. GRB 060515: Super-LOTIS Observations
  51. GRB060515: Swift/UVOT initial observation
  52. GRB 060515: TAROT optical observation
  53. GRB 060512: Subaru NIR observation
  54. GRB 060512: 1.54m Kuiper Observations
  55. GRB 060512: Detection of NIR afterglow
  56. GRB 060512: P60 Observations
  57. GRB 060512: Swift-BAT Refined Analysis
  58. GRB 060512: REM NIR observations
  59. GRB060512 - SDSS Pre-Burst Observations
  60. GRB 060512: Swift detection of a burst with an optical afterglow
  61. GRB 060505: X-ray afterglow - Correction -
  62. GRB 060505: X-ray afterglow
  63. GRB060418: optical observations
  64. GRB 060428a, SMARTS optical/IR afterglow detection
  65. GRB 060510A: Refined analysis of the Swift-BAT burst
  66. GRB060510 - SDSS Pre-Burst Observations
  67. GRB 060510B: Swift detection of a burst
  68. GRB 060510: Swift detection of a burst with optical transient
  69. GRB060507: optical afterglow detection
  70. GRB060502B: improvement in the XRT afterglow position
  71. GRB 060505: PROMPT Observations
  72. GRB 060507: Swift detection of a burst
  73. GRB060505: Swift/UVOT Observations
  74. GRB 060505: Swift XRT Team Refined Analysis
  75. GRB060425: new MASTER survey method
  76. GRB 060505: Swift XRT afterglow canditate position
  77. GRB 060502b: Second epoch Gemini observations
  78. GRB 060428B: spectroscopy
  79. GRB 060502B: optical observations
  80. GRB 060502B: AROMA refined photometric calibration
  81. GRB 060502B MDM Follow-up Observation
  82. GRB 060502b: Gemini imaging and spectroscopy
  83. GRB060502A, optical observation
  84. GRB 060502B: Swift/UVOT upper limits
  85. GRB 060502A: Swift/UVOT source detection
  86. GRB 060502B: Refined analysis of the Swift-BAT short burst
  87. GRB 060427B Milagro GeV/TeV Observations
  88. GRB 060501: P60 Observations and Candidate Retraction
  89. GRB 060502B: Xinglong optical observation
  90. GRB060501: Swift UVOT followup observations
  91. GRB 060502: P60 Afterglow Confirmation
  92. GRB 060502: Swift detection of a burst with an optical counterpart
  93. GRB060501: Super-LOTIS observations
  94. GRB060501: P60 imaging and afterglow candidate
  95. GRB060428B - SDSS Pre-Burst Observations
  96. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  97. GRB 060427B: IPN localization of a short hard burst
  98. GRB 060428B: Xinglong I-band limit
  99. GRB 051117A: Bright host galaxy not confirmed
  100. GRB060428A: Swift/UVOT observations.

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