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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"

43844 results found.

  1. GRB 060427B: MASTER optical observations
  2. GRB060428B: Swift XRT Team refined analysis
  3. GRB 060427B: IPN localization of a short hard burst
  4. GRB 060428B: Refined analysis of the Swift-BAT burst
  5. GRB 060428B: KAIT observations
  6. GRB060425:MASTER optical limit
  7. GRB 051117A: Bright host galaxy not confirmed
  8. GRB060428A: Swift/UVOT observations.
  9. GRB 060428A: Refined analysis of the Swift-BAT burst
  10. GRB 060428b : Kiso R-band limit
  11. GRB 060428b: Optical afterglow candidate
  12. GRB060428A: Swift XRT Team refined analysis
  13. GRB 060428B: Swift detection of a burst
  14. GRB 060427: NIR observations
  15. GRB 060428: Swift detection of a burst
  16. GRB 060427: NOT observations
  17. GRB 060427: Swift/UVOT upper limits.
  18. GRB 060427: Refined analysis of the Swift-BAT burst
  19. GRB060427: Swift XRT Team refined analysis
  20. GRB060418: Swift XRT Team Further Refined Analysis
  21. GRB 060427, optical observation
  22. GRB 060427: Swift detection of a burst
  23. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  24. An interactive program for GRB pseudo-redshift computations
  25. GRB060424: optical afterglow detection
  26. GRB060418: Further Analysis of MIKE Spectroscopy
  27. GRB 060424: Refined analysis of the Swift-BAT burst
  28. GRB 060424: Swift detection of a burst
  29. GRB 060421: TTT Observations
  30. OT 060420: Likely Not a New Cosmic Transient
  31. No OT 060420 in MASCOT images
  32. Swift-BAT detection of Mrk 421
  33. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  34. GRB060421: Swift/UVOT observations
  35. GRB 060421: Swift-BAT Refined Analysis
  36. GRB 060421: Swift-XRT refined analysis
  37. GRB 060418: prediction of t_break
  38. GRB060418: optical observations
  39. Konus-Wind observation of GRB 060418
  40. GRB(?)060421 : XRT position
  41. GRB(?) 060421: Swift detection of a burst
  42. Erratum of GCN 4983 for GRB 060418 IR follow-up
  43. GRB 060418 : IR afterglow observations
  44. GRB 060418 : Lulin Optical follow-up
  45. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  46. GRB 060418: Radio Observations
  47. GRB060418, BVRcIc field calibration
  48. GRB060418: Swift/UVOT Observations
  49. GRB060418: Optical Observations
  50. GRB 060418: Refined Analysis of the Swift-BAT burst
  51. VLT/UVES observations of GRB060418
  52. GRB060418: Swift XRT Team Refined Analysis
  53. GRB 060418: PROMPT Detections
  54. GRB 060418, SMARTS optical/IR afterglow observations
  55. GRB060418: Magellan/MIKE Spectroscopic Redshift
  56. GRB060418 : LT optical afterglow observation
  57. GRB 060418: REM candidate afterglow
  58. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  59. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  60. GRB060413: Swift/UVOT upper limits
  61. GRB 060413: REM NIR Observations
  62. SGR 1900+14: Swift detection of an outburst
  63. GRB 060413: Refined analysis of the Swift-BAT burst
  64. GRB 060413: Watcher UBVR observations
  65. GRB 060413: XRT refined analysis
  66. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  67. GRB 060413: Swift detection of a burst
  68. GRB060403: optical observations
  69. GRB 060403: MITSuME optical observation
  70. GRB060403: Optical Limit
  71. GRB060403: XRT refined analysis
  72. GRB 060403: Swift/UVOT upper limits
  73. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  74. SGR 1900+14: BAT observations
  75. GRB 060403: Refined analysis of the Swift-BAT burst
  76. GRB060403: Swift XRT refined position
  77. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  78. GRB 060403: Swift detection of a burst
  79. HETE trigger H4044: RTT150 optical observations
  80. GRB060331: Swift/UVOT upper limits
  81. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  82. HETE Trigger 4043: ROTSE-III Optical Limits
  83. H4043, an unusual high-energy transient observed by HETE
  84. GRB 060322: LNA optical limit
  85. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  86. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  87. SGR 1900+14: Swift-BAT detection of a bright outburst
  88. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  89. GRB 060323 : WIDGET simultaneous optical observations
  90. GRB 060323: Early optical observation at Xinglong
  91. GRB060218, optical observations
  92. GRB 060322: Confirmation of Swift XRT afterglow
  93. GRB 060211A: optical observation
  94. GRB060211B: optical observation
  95. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  96. SGR 1900+14: Swift detection of renewed activity
  97. GRB 060322: IAC80 optical observations
  98. GRB 060322: Swift XRT afterglow candidate
  99. GRB060323: P60 Observations
  100. GRB 060323: Swift/UVOT Observations

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