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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"

39265 results found.

  1. GRB 060515: Upper Limit on Host Galaxy
  2. GRB 050223: Magellan redshift
  3. GRB 060614: SMARTS host galaxy observations
  4. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  5. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  6. GRB 060109: Upper Limit on Host Galaxy
  7. GRB 060105: Upper limit on Host Galaxy
  8. GRB060614: Detection of the host galaxy but no supernova emission
  9. GRB 060614: redshift confirmation
  10. GRB 060614: Redshift
  11. Swift-BAT trigger 215279 is not a GRB
  12. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  13. GRB060614: Optical observations
  14. GRB 060614: spectroscopy
  15. GRB050326: Host Galaxy Candidates
  16. GRB050124: Possible Host Galaxy
  17. GRB050223: Host Galaxy
  18. GRB060512: near IR observations
  19. GRB060526: optical observations
  20. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  21. Konus-Wind observation of GRB 060614
  22. GRB060605: optical observation
  23. The Unusually Long-Lived Afterglow of GRB 060614
  24. GRB 060614: optical observations
  25. GRB 060605, optical observations
  26. GRB 060614, SMARTS optical/IR afterglow observation
  27. GRB060614: SSO 1m observations
  28. GRB060614: Watcher observation
  29. GRB 060614: Swift-BAT refined analysis
  30. GRB 060614: Swift/UVOT Observations
  31. GRB 060604, optical observations
  32. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  33. GRB 060602A: Swift/XRT analysis
  34. BAT Trigger #214277 is SGR 1900+14
  35. GRB 060610: KAIT observations
  36. GRB 060607: RTT150 optical observations
  37. GRB 070706B: Watcher upper limit
  38. GRB 060607B: Swift-BAT Refined Analysis
  39. GRB 060607B: Swift detection of a burst
  40. GCN 060607: Swift-UVOT obswervations.
  41. GRB 060607: Swift-BAT Refined Analysis
  42. GRB 060607: optical limit by "Pi of the Sky"
  43. GRB 060607: Swift-XRT Team refined analysis
  44. GRB 060607: IR observations
  45. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  46. VLT/UVES observations of GRB 060607
  47. GRB 060607: PROMPT Observations
  48. GRB 060605: RTT150 optical observations
  49. GRB 060607: REM NIR afterglow
  50. GRB 060607: Swift detection of a burst with bright optical counterpart
  51. GRB 060522: PROMPT Optical Limits
  52. GRB 060605 BAT refined analysis
  53. GRB 060605: Xinglong TNT optical observations
  54. GRB060602B : REM infrared observations
  55. GRB060605: Swift/UVOT detections
  56. GRB 060605: Swift-XRT Team refined analysis
  57. SALT spectroscopy of GRB 060605
  58. GRB 060605: TNG optical observations
  59. GRB 060605: RTT150 optical observations
  60. GRB 060605: ROTSE-III Optical Counterpart
  61. GRB 060605: Swift detection of a burst with optical counterpart
  62. GRB 060605: ROTSE-III Detection of Optical Counterpart
  63. GRB 060604: redshift
  64. GRB 060512: Keck Redshift
  65. GRB 060604 optical photometry
  66. GRB 060604: Swift-XRT Team refined analysis
  67. GRB 060604: BAT refined analysis
  68. GRB 060604A: ROTSE-III Optical Limits
  69. GRB 060604: Swift detection of a burst with possible optical counterpart
  70. GRB 060602A: Swift-BAT Refined Analysis: Correction
  71. GRB 060602B: XMM-Newton Survey Source
  72. GRB 060602B: Swift-XRT Refined Analysis
  73. GRB 060602B: Swift-BAT Refined Analysis
  74. GRB 060602B: Swift/UVOT observations
  75. GRB 060602A: Swift-BAT Refined Analysis
  76. GRB 060602B: RTT150 optical observations
  77. GRB 060211A : WIDGET simultaneous optical observations
  78. GRB060602A: optical observations(/transient?)
  79. GRB 060526: Tautenburg Second Epoch Observations
  80. GRB060602A: Bootes-IR observations
  81. GRB 060602B: Swift detection of a burst
  82. GRB060602B: Watcher observations - no OT candidate
  83. GRB060602B: BOOTES-IR candidate afterglow
  84. GRB060602 - SDSS Pre-Burst Observations
  85. GRB 060602: Swift detection of a burst
  86. GRB 060502A: Optical afterglow observations
  87. GRB 060526: Break in X-ray light curve
  88. GRB 060526: RTT150 optical observations
  89. GRB060526, optical observations
  90. GRB 051227 : WIDGET simultaneous optical observations
  91. GRB 051028 : WIDGET pre-trigger limit
  92. GRB 060526: RTT150 optical observations
  93. GRB 060526: Multiple Optical Flares
  94. GRB060526: afterglow fitting and probable jet break
  95. GRB 060526: RTT150 optical observations
  96. GRB060502b: optical observations
  97. GRB 060526: RTT150 optical observations
  98. GRB 060526: Tautenburg OT observation and light curve fitting
  99. GRB060526: optical observations
  100. GRB 060526: SMARTS optical/IR afterglow observations

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