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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"

37171 results found.

  1. GRB 060717: Swift-BAT refined analysis
  2. GRB060717 - SDSS Pre-burst Observations
  3. GRB 060714: REM infrared observations
  4. GRB 060717, optical observation
  5. GRB 060717: Swift detection of a burst
  6. GRB060714: correction to GCN 5324
  7. GRB060714: optical observations
  8. GRB 060714, SMARTS optical/IR afterglow observation
  9. GRB 060714 : Liverpool Telescope Observations
  10. GRB 060714: Swift XRT refined analysis
  11. GRB 060714: OA redshift
  12. GRB 060708: VLT spectroscopy
  13. GRB060708: MARGE low resolution spectrum observations
  14. GRB060714: optical observations
  15. Swift-BAT trigger 219136 is not a GRB
  16. Correction to Circular 5314: Circular refers to GRB 060714
  17. GRB060707 possible optical confirmation
  18. Swift trigger 219136 is probably not a GRB
  19. GRB 060714, optical observation
  20. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  21. GRB 060605: SkyNet Optical Limits
  22. GRB060712: P60 Observations
  23. GRB 060712: XRT refined analysis
  24. GRB 060712: Swift/UVOT Upper Limits
  25. GRB060526: optical observations
  26. GRB 060712: XRT refined position
  27. GRB 060712: Refined analysis of the Swift-BAT burst
  28. GRB060712: MASTER optical observation
  29. GRB120706: MASTER optical observation
  30. GRB 060712: Swift detection of a burst
  31. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  32. GRB 060708: PROMPT Optical Limits
  33. GRB 060707: OA fading and redshift
  34. GRB 060708: Swift-XRT refined analysis
  35. GCN 060708: Swift-UVOT Observations
  36. GRB 060708: Refined analysis of the Swift-BAT burst
  37. GCN 060707: Swift-UVOT observations
  38. GRB 060707: Swift-XRT refined analysis
  39. GRB 060708: Swift detection of a burst with an UVOT countpart
  40. GRB060707 possible optical confirmation
  41. GRB 060707: BOOTES-IR optical afterglow candidate
  42. GRB 060707: Refined analysis of the Swift-BAT burst
  43. GRB 060707: BOOTES-IR optical observation
  44. GRB 060707: Swift detection of a burst
  45. GRB 060515: Upper Limit on Host Galaxy
  46. GRB 050223: Magellan redshift
  47. GRB 060614: SMARTS host galaxy observations
  48. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  49. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  50. GRB 060109: Upper Limit on Host Galaxy
  51. GRB 060105: Upper limit on Host Galaxy
  52. GRB060614: Detection of the host galaxy but no supernova emission
  53. GRB 060614: redshift confirmation
  54. GRB 060614: Redshift
  55. Swift-BAT trigger 215279 is not a GRB
  56. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  57. GRB060614: Optical observations
  58. GRB 060614: spectroscopy
  59. GRB050326: Host Galaxy Candidates
  60. GRB050124: Possible Host Galaxy
  61. GRB050223: Host Galaxy
  62. GRB060512: near IR observations
  63. GRB060526: optical observations
  64. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  65. Konus-Wind observation of GRB 060614
  66. GRB060605: optical observation
  67. The Unusually Long-Lived Afterglow of GRB 060614
  68. GRB 060614: optical observations
  69. GRB 060605, optical observations
  70. GRB 060614, SMARTS optical/IR afterglow observation
  71. GRB060614: SSO 1m observations
  72. GRB060614: Watcher observation
  73. GRB 060614: Swift-BAT refined analysis
  74. GRB 060614: Swift/UVOT Observations
  75. GRB060614: Swift-XRT refined analysis
  76. GRB 060604, optical observations
  77. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  78. GRB 060602A: Swift/XRT analysis
  79. BAT Trigger #214277 is SGR 1900+14
  80. GRB 060610: KAIT observations
  81. GRB 060607: RTT150 optical observations
  82. GRB 070706B: Watcher upper limit
  83. GRB 060607B: Swift-BAT Refined Analysis
  84. GRB 060607B: Swift detection of a burst
  85. GCN 060607: Swift-UVOT obswervations.
  86. GRB 060607: Swift-BAT Refined Analysis
  87. GRB 060607: optical limit by "Pi of the Sky"
  88. GRB 060607: Swift-XRT Team refined analysis
  89. GRB 060607: IR observations
  90. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  91. VLT/UVES observations of GRB 060607
  92. GRB 060607: PROMPT Observations
  93. GRB 060605: RTT150 optical observations
  94. GRB 060607: REM NIR afterglow
  95. GRB 060607: Swift detection of a burst with bright optical counterpart
  96. GRB 060522: PROMPT Optical Limits
  97. GRB 060605 BAT refined analysis
  98. GRB 060605: Xinglong TNT optical observations
  99. GRB060602B : REM infrared observations
  100. GRB060605: Swift/UVOT detections

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Download all Circulars as a .tar.gz archive (updated once a day):
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