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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"

32494 results found.

  1. GRB 060717: Swift XRT refined position
  2. GRB 060717: Swift-BAT refined analysis
  3. GRB060717 - SDSS Pre-burst Observations
  4. GRB 060714: REM infrared observations
  5. GRB 060717, optical observation
  6. GRB060714: correction to GCN 5324
  7. GRB 060714, SMARTS optical/IR afterglow observation
  8. GRB 060714 : Liverpool Telescope Observations
  9. GRB 060714: Swift XRT refined analysis
  10. GRB 060714: OA redshift
  11. GRB 060708: VLT spectroscopy
  12. GRB060708: MARGE low resolution spectrum observations
  13. Swift-BAT trigger 219136 is not a GRB
  14. Correction to Circular 5314: Circular refers to GRB 060714
  15. GRB060707 possible optical confirmation
  16. GRB 060714, optical observation
  17. GRB 060605: SkyNet Optical Limits
  18. GRB060712: P60 Observations
  19. GRB 060712: Swift/UVOT Upper Limits
  20. GRB 060712: Refined analysis of the Swift-BAT burst
  21. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  22. GRB 060708: PROMPT Optical Limits
  23. GRB 060707: OA fading and redshift
  24. GRB 060708: Swift-XRT refined analysis
  25. GCN 060708: Swift-UVOT Observations
  26. GRB 060708: Refined analysis of the Swift-BAT burst
  27. GCN 060707: Swift-UVOT observations
  28. GRB 060707: Swift-XRT refined analysis
  29. GRB060707 possible optical confirmation
  30. GRB 060707: Refined analysis of the Swift-BAT burst
  31. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  32. GRB 060515: Upper Limit on Host Galaxy
  33. GRB 050223: Magellan redshift
  34. GRB 060614: SMARTS host galaxy observations
  35. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  36. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  37. GRB 060109: Upper Limit on Host Galaxy
  38. GRB 060105: Upper limit on Host Galaxy
  39. GRB060614: Detection of the host galaxy but no supernova emission
  40. GRB 060614: redshift confirmation
  41. GRB 060614: Redshift
  42. Swift-BAT trigger 215279 is not a GRB
  43. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  44. GRB060614: Optical observations
  45. GRB 060614: spectroscopy
  46. GRB050326: Host Galaxy Candidates
  47. GRB050124: Possible Host Galaxy
  48. GRB050223: Host Galaxy
  49. GRB060512: near IR observations
  50. Konus-Wind observation of GRB 060614
  51. GRB060605: optical observation
  52. The Unusually Long-Lived Afterglow of GRB 060614
  53. GRB 060614: optical observations
  54. GRB 060605, optical observations
  55. GRB 060614, SMARTS optical/IR afterglow observation
  56. GRB060614: SSO 1m observations
  57. GRB060614: Watcher observation
  58. GRB 060614: Swift-BAT refined analysis
  59. GRB 060614: Swift/UVOT Observations
  60. GRB060614: Swift-XRT refined analysis
  61. GRB 060604, optical observations
  62. GRB 060602A: Swift/XRT analysis
  63. BAT Trigger #214277 is SGR 1900+14
  64. GRB 070706B: Watcher upper limit
  65. GRB 060607B: Swift-BAT Refined Analysis
  66. GRB060602A: Swift/UVOT upper limits
  67. GCN 060607: Swift-UVOT obswervations.
  68. GRB 060607: Swift-BAT Refined Analysis
  69. GRB 060607: Swift-XRT Team refined analysis
  70. GRB 060607: IR observations
  71. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  72. VLT/UVES observations of GRB 060607
  73. GRB 060607: PROMPT Observations
  74. GRB 060607: REM NIR afterglow
  75. GRB 060522: PROMPT Optical Limits
  76. GRB 060605 BAT refined analysis
  77. GRB 060605: Xinglong TNT optical observations
  78. GRB060602B : REM infrared observations
  79. GRB060605: Swift/UVOT detections
  80. GRB 060605: Swift-XRT Team refined analysis
  81. SALT spectroscopy of GRB 060605
  82. GRB 060605: TNG optical observations
  83. GRB 060605: RTT150 optical observations
  84. GRB060605: Spectral Observations and Redshift
  85. GRB 060605: ROTSE-III Optical Counterpart
  86. GRB 060605: ROTSE-III Detection of Optical Counterpart
  87. GRB060604: Swift/UVOT detections
  88. GRB 060604: redshift
  89. GRB 060512: Keck Redshift
  90. GRB 060604 optical photometry
  91. GRB 060604: Swift-XRT Team refined analysis
  92. GRB 060604: BAT refined analysis
  93. GRB 060604A: ROTSE-III Optical Limits
  94. GRB 060602A: Swift-BAT Refined Analysis: Correction
  95. GRB 060602B: XMM-Newton Survey Source
  96. GRB 060602B: Swift-XRT Refined Analysis
  97. GRB 060602B: Swift-BAT Refined Analysis
  98. GRB 060602B: Swift/UVOT observations
  99. GRB 060602A: Swift-BAT Refined Analysis
  100. GRB 060211A : WIDGET simultaneous optical observations

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