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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"

43854 results found.

  1. GRB060501: Swift XRT position
  2. GRB 060501: ROTSE-III Optical Limits
  3. GRB 060501: Swift detection of a burst
  4. IPN triangulation of GRB060429 (short/hard)
  5. Konus-Wind observation of GRB 060427B
  6. GRB060428B - SDSS Pre-Burst Observations
  7. GRB060428B: optical observation
  8. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  9. GRB 060428B: MDM Observations
  10. GRB 060428A: PROMPT Observations
  11. GRB 060427B: MASTER optical observations
  12. GRB060428B: Swift XRT Team refined analysis
  13. GRB 060427B: IPN localization of a short hard burst
  14. GRB 060428B: Refined analysis of the Swift-BAT burst
  15. GRB 060428B: KAIT observations
  16. GRB060425:MASTER optical limit
  17. GRB 051117A: Bright host galaxy not confirmed
  18. GRB060428A: Swift/UVOT observations.
  19. GRB 060428A: Refined analysis of the Swift-BAT burst
  20. GRB 060428b : Kiso R-band limit
  21. GRB 060428b: Optical afterglow candidate
  22. GRB060428A: Swift XRT Team refined analysis
  23. GRB 060428B: Swift detection of a burst
  24. GRB 060427: NIR observations
  25. GRB 060428: Swift detection of a burst
  26. GRB 060427: NOT observations
  27. GRB 060427: Swift/UVOT upper limits.
  28. GRB 060427: Refined analysis of the Swift-BAT burst
  29. GRB060427: Swift XRT Team refined analysis
  30. GRB060418: Swift XRT Team Further Refined Analysis
  31. GRB 060427, optical observation
  32. GRB 060427: Swift detection of a burst
  33. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  34. An interactive program for GRB pseudo-redshift computations
  35. GRB060424: optical afterglow detection
  36. GRB060418: Further Analysis of MIKE Spectroscopy
  37. GRB 060424: Refined analysis of the Swift-BAT burst
  38. GRB 060424: Swift detection of a burst
  39. GRB 060421: TTT Observations
  40. OT 060420: Likely Not a New Cosmic Transient
  41. No OT 060420 in MASCOT images
  42. Swift-BAT detection of Mrk 421
  43. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  44. GRB060421: Swift/UVOT observations
  45. GRB 060421: Swift-BAT Refined Analysis
  46. GRB 060421: Swift-XRT refined analysis
  47. GRB 060418: prediction of t_break
  48. GRB060418: optical observations
  49. Konus-Wind observation of GRB 060418
  50. GRB(?)060421 : XRT position
  51. GRB(?) 060421: Swift detection of a burst
  52. Erratum of GCN 4983 for GRB 060418 IR follow-up
  53. GRB 060418 : IR afterglow observations
  54. GRB 060418 : Lulin Optical follow-up
  55. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  56. GRB 060418: Radio Observations
  57. GRB060418, BVRcIc field calibration
  58. GRB060418: Swift/UVOT Observations
  59. GRB060418: Optical Observations
  60. GRB 060418: Refined Analysis of the Swift-BAT burst
  61. VLT/UVES observations of GRB060418
  62. GRB060418: Swift XRT Team Refined Analysis
  63. GRB 060418: PROMPT Detections
  64. GRB 060418, SMARTS optical/IR afterglow observations
  65. GRB060418: Magellan/MIKE Spectroscopic Redshift
  66. GRB060418 : LT optical afterglow observation
  67. GRB 060418: REM candidate afterglow
  68. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  69. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  70. GRB060413: Swift/UVOT upper limits
  71. GRB 060413: REM NIR Observations
  72. SGR 1900+14: Swift detection of an outburst
  73. GRB 060413: Refined analysis of the Swift-BAT burst
  74. GRB 060413: Watcher UBVR observations
  75. GRB 060413: XRT refined analysis
  76. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  77. GRB 060413: Swift detection of a burst
  78. GRB060403: optical observations
  79. GRB 060403: MITSuME optical observation
  80. GRB060403: Optical Limit
  81. GRB060403: XRT refined analysis
  82. GRB 060403: Swift/UVOT upper limits
  83. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  84. SGR 1900+14: BAT observations
  85. GRB 060403: Refined analysis of the Swift-BAT burst
  86. GRB060403: Swift XRT refined position
  87. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  88. GRB 060403: Swift detection of a burst
  89. HETE trigger H4044: RTT150 optical observations
  90. GRB060331: Swift/UVOT upper limits
  91. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  92. HETE Trigger 4043: ROTSE-III Optical Limits
  93. H4043, an unusual high-energy transient observed by HETE
  94. GRB 060322: LNA optical limit
  95. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  96. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  97. SGR 1900+14: Swift-BAT detection of a bright outburst
  98. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  99. GRB 060323 : WIDGET simultaneous optical observations
  100. GRB 060323: Early optical observation at Xinglong

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