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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"

19550 results found.

  1. GRB060602A: optical observations(/transient?)
  2. GRB 060602B: Swift detection of a burst
  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: Watcher Observations
  17. GRB060526 - SDSS Pre-burst Observations
  18. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  19. GRB 060413 : WIDGET simultaneous optical observations
  20. XMM-Newton observation of GRB060510b
  21. GRB060512: Late-Time P200 Observations
  22. GRB 060522: REM NIR observations
  23. GRB 060522: TNG optical observations
  24. GRB 060515: NIR observation
  25. GRB060515: P200 NIR Observations
  26. GRB 060505 BAT refined analysis
  27. GRB 060515 BAT refined analysis
  28. GRB 060512: TAROT optical observation
  29. GRB 060515: Swift/UVOT Upper Limits
  30. GRB 060515: Swift/XRT position
  31. GRB 060515: Super-LOTIS Observations
  32. GRB060515: Swift/UVOT initial observation
  33. GRB 060515: TAROT optical observation
  34. GRB 060512: Subaru NIR observation
  35. GRB 060512: 1.54m Kuiper Observations
  36. GRB 060512: Detection of NIR afterglow
  37. GRB 060512: P60 Observations
  38. GRB 060512: Swift-BAT Refined Analysis
  39. GRB 060512: REM NIR observations
  40. GRB060512 - SDSS Pre-Burst Observations
  41. GRB 060512: Swift detection of a burst with an optical afterglow
  42. GRB 060505: X-ray afterglow - Correction -
  43. GRB 060505: X-ray afterglow
  44. GRB060418: optical observations
  45. GRB 060428a, SMARTS optical/IR afterglow detection
  46. GRB 060510A: Refined analysis of the Swift-BAT burst
  47. GRB060510 - SDSS Pre-Burst Observations
  48. GRB 060510B: Swift detection of a burst
  49. GRB 060510: Swift detection of a burst with optical transient
  50. GRB060507: optical afterglow detection
  51. GRB060502B: improvement in the XRT afterglow position
  52. GRB 060505: PROMPT Observations
  53. GRB 060507: Swift detection of a burst
  54. GRB060505: Swift/UVOT Observations
  55. GRB 060505: Swift XRT Team Refined Analysis
  56. GRB060425: new MASTER survey method
  57. GRB 060505: Swift XRT afterglow canditate position
  58. GRB 060502b: Second epoch Gemini observations
  59. GRB 060428B: spectroscopy
  60. GRB 060502B: optical observations
  61. GRB 060502B: AROMA refined photometric calibration
  62. GRB 060502B MDM Follow-up Observation
  63. GRB 060502b: Gemini imaging and spectroscopy
  64. GRB060502A, optical observation
  65. GRB 060502B: Swift/UVOT upper limits
  66. GRB 060502A: Swift/UVOT source detection
  67. GRB 060502B: Refined analysis of the Swift-BAT short burst
  68. GRB 060427B Milagro GeV/TeV Observations
  69. GRB 060501: P60 Observations and Candidate Retraction
  70. GRB 060502B: Xinglong optical observation
  71. GRB060501: Swift UVOT followup observations
  72. GRB 060502: P60 Afterglow Confirmation
  73. GRB 060502: Swift detection of a burst with an optical counterpart
  74. GRB060501: Super-LOTIS observations
  75. GRB060501: P60 imaging and afterglow candidate
  76. GRB060428B - SDSS Pre-Burst Observations
  77. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  78. GRB 060427B: IPN localization of a short hard burst
  79. GRB 060428B: Xinglong I-band limit
  80. GRB 051117A: Bright host galaxy not confirmed
  81. GRB060428A: Swift/UVOT observations.
  82. GRB060428B, optical observation
  83. GRB 060428A: Refined analysis of the Swift-BAT burst
  84. GRB 060428b : Kiso R-band limit
  85. GRB 060428b: Optical afterglow candidate
  86. GRB 060428B: Swift detection of a burst
  87. GRB 060427: NIR observations
  88. GRB060427: Xinglong optical Observations
  89. GRB 060428: Swift detection of a burst
  90. GRB 060427: Swift/UVOT upper limits.
  91. GRB 060427, optical observation
  92. GRB 060427: Swift detection of a burst
  93. GRB 060424: Refined analysis of the Swift-BAT burst
  94. GRB060421: Swift/UVOT observations
  95. GRB(?) 060421: Swift detection of a burst
  96. Erratum of GCN 4983 for GRB 060418 IR follow-up
  97. GRB 060418 : IR afterglow observations
  98. GRB 060418: Radio Observations
  99. GRB060418, BVRcIc field calibration
  100. GRB060418: Swift/UVOT Observations

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