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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"

19089 results found.

  1. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  2. GRB060712: P60 Observations
  3. GRB 060712: Swift/UVOT Upper Limits
  4. GRB 060712: XRT refined position
  5. GRB 060707: OA fading and redshift
  6. GCN 060708: Swift-UVOT Observations
  7. GCN 060707: Swift-UVOT observations
  8. GRB 060708: Swift detection of a burst with an UVOT countpart
  9. GRB 060707: Swift detection of a burst
  10. GRB 060515: Upper Limit on Host Galaxy
  11. GRB 060109: Upper Limit on Host Galaxy
  12. GRB 060105: Upper limit on Host Galaxy
  13. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  14. GRB050326: Host Galaxy Candidates
  15. GRB050124: Possible Host Galaxy
  16. GRB050223: Host Galaxy
  17. GRB060605: optical observation
  18. GRB 060605, optical observations
  19. GRB 060614: Swift/UVOT Observations
  20. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  21. GRB 060602A: Swift/XRT analysis
  22. GRB 060610: KAIT observations
  23. GRB 060607: RTT150 optical observations
  24. GRB060602A: Swift/UVOT upper limits
  25. GRB 060607B: Swift detection of a burst
  26. GCN 060607: Swift-UVOT obswervations.
  27. GRB 060607: IR observations
  28. GRB 060605: RTT150 optical observations
  29. GRB 060607: REM NIR afterglow
  30. GRB 060607: Swift detection of a burst with bright optical counterpart
  31. GRB 060605: Xinglong TNT optical observations
  32. GRB060602B : REM infrared observations
  33. GRB060605: Swift/UVOT detections
  34. GRB 060605: RTT150 optical observations
  35. GRB060604: Swift/UVOT detections
  36. GRB 060604A: ROTSE-III Optical Limits
  37. GRB 060604: Swift detection of a burst with possible optical counterpart
  38. GRB 060602B: XMM-Newton Survey Source
  39. GRB 060602B: Swift/UVOT observations
  40. GRB060602A: optical observations(/transient?)
  41. GRB 060602B: Swift detection of a burst
  42. GRB060602 - SDSS Pre-Burst Observations
  43. GRB 060502A: Optical afterglow observations
  44. GRB 060526: Break in X-ray light curve
  45. GRB060526, optical observations
  46. GRB 051227 : WIDGET simultaneous optical observations
  47. GRB 051028 : WIDGET pre-trigger limit
  48. GRB060526: Optical counterpart from MIRO
  49. GRB 060526: RTT150 optical observations
  50. GRB060526: optical observations
  51. GRB 060526: REM observations
  52. GRB 060526: RTT150 optical observations, afterglow flattening
  53. GRB 060526: RTT150 optical observations
  54. GRB060526, optical observations
  55. GRB 060526: Watcher Observations
  56. GRB060526 - SDSS Pre-burst Observations
  57. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  58. GRB 060413 : WIDGET simultaneous optical observations
  59. XMM-Newton observation of GRB060510b
  60. GRB060512: Late-Time P200 Observations
  61. GRB 060522: REM NIR observations
  62. GRB 060522: TNG optical observations
  63. GRB 060515: NIR observation
  64. GRB060515: P200 NIR Observations
  65. GRB 060505 BAT refined analysis
  66. GRB 060515 BAT refined analysis
  67. GRB 060512: TAROT optical observation
  68. GRB 060515: Swift/UVOT Upper Limits
  69. GRB 060515: Swift/XRT position
  70. GRB 060515: Super-LOTIS Observations
  71. GRB060515: Swift/UVOT initial observation
  72. GRB 060515: TAROT optical observation
  73. GRB 060512: Subaru NIR observation
  74. GRB 060512: 1.54m Kuiper Observations
  75. GRB 060512: Detection of NIR afterglow
  76. GRB 060512: P60 Observations
  77. GRB 060512: Swift-BAT Refined Analysis
  78. GRB 060512: REM NIR observations
  79. GRB060512 - SDSS Pre-Burst Observations
  80. GRB 060512: Swift detection of a burst with an optical afterglow
  81. GRB 060505: X-ray afterglow - Correction -
  82. GRB 060505: X-ray afterglow
  83. GRB060418: optical observations
  84. GRB 060428a, SMARTS optical/IR afterglow detection
  85. GRB 060510A: Refined analysis of the Swift-BAT burst
  86. GRB060510 - SDSS Pre-Burst Observations
  87. GRB 060510B: Swift detection of a burst
  88. GRB 060510: Swift detection of a burst with optical transient
  89. GRB060507: optical afterglow detection
  90. GRB060502B: improvement in the XRT afterglow position
  91. GRB 060505: PROMPT Observations
  92. GRB 060507: Swift detection of a burst
  93. GRB060505: Swift/UVOT Observations
  94. GRB 060505: Swift XRT Team Refined Analysis
  95. GRB060425: new MASTER survey method
  96. GRB 060505: Swift XRT afterglow canditate position
  97. GRB 060502b: Second epoch Gemini observations
  98. GRB 060428B: spectroscopy
  99. GRB 060502B: optical observations
  100. GRB 060502B: AROMA refined photometric calibration

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