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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"

32501 results found.

  1. GRB 060719: VLT observations
  2. GRB 060717: Swift XRT refined analysis
  3. GRB 060714: OA fading and a possible host detection
  4. GRB 060717: NOT observations
  5. GRB 060714: Refined analysis of the Swift-BAT burst
  6. GRB 060717 optical upper limit
  7. GRB060717: Swift/UVOT upper limits
  8. GRB 060717: Swift XRT refined position
  9. GRB 060717: Swift-BAT refined analysis
  10. GRB060717 - SDSS Pre-burst Observations
  11. GRB 060714: REM infrared observations
  12. GRB 060717, optical observation
  13. GRB060714: correction to GCN 5324
  14. GRB 060714, SMARTS optical/IR afterglow observation
  15. GRB 060714 : Liverpool Telescope Observations
  16. GRB 060714: Swift XRT refined analysis
  17. GRB 060714: OA redshift
  18. GRB 060708: VLT spectroscopy
  19. GRB060708: MARGE low resolution spectrum observations
  20. Swift-BAT trigger 219136 is not a GRB
  21. Correction to Circular 5314: Circular refers to GRB 060714
  22. GRB060707 possible optical confirmation
  23. GRB 060714, optical observation
  24. GRB 060605: SkyNet Optical Limits
  25. GRB060712: P60 Observations
  26. GRB 060712: Swift/UVOT Upper Limits
  27. GRB 060712: Refined analysis of the Swift-BAT burst
  28. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  29. GRB 060708: PROMPT Optical Limits
  30. GRB 060707: OA fading and redshift
  31. GRB 060708: Swift-XRT refined analysis
  32. GCN 060708: Swift-UVOT Observations
  33. GRB 060708: Refined analysis of the Swift-BAT burst
  34. GCN 060707: Swift-UVOT observations
  35. GRB 060707: Swift-XRT refined analysis
  36. GRB060707 possible optical confirmation
  37. GRB 060707: Refined analysis of the Swift-BAT burst
  38. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  39. GRB 060515: Upper Limit on Host Galaxy
  40. GRB 050223: Magellan redshift
  41. GRB 060614: SMARTS host galaxy observations
  42. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  43. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  44. GRB 060109: Upper Limit on Host Galaxy
  45. GRB 060105: Upper limit on Host Galaxy
  46. GRB060614: Detection of the host galaxy but no supernova emission
  47. GRB 060614: redshift confirmation
  48. GRB 060614: Redshift
  49. Swift-BAT trigger 215279 is not a GRB
  50. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  51. GRB060614: Optical observations
  52. GRB 060614: spectroscopy
  53. GRB050326: Host Galaxy Candidates
  54. GRB050124: Possible Host Galaxy
  55. GRB050223: Host Galaxy
  56. GRB060512: near IR observations
  57. Konus-Wind observation of GRB 060614
  58. GRB060605: optical observation
  59. The Unusually Long-Lived Afterglow of GRB 060614
  60. GRB 060614: optical observations
  61. GRB 060605, optical observations
  62. GRB 060614, SMARTS optical/IR afterglow observation
  63. GRB060614: SSO 1m observations
  64. GRB060614: Watcher observation
  65. GRB 060614: Swift-BAT refined analysis
  66. GRB 060614: Swift/UVOT Observations
  67. GRB060614: Swift-XRT refined analysis
  68. GRB 060604, optical observations
  69. GRB 060602A: Swift/XRT analysis
  70. BAT Trigger #214277 is SGR 1900+14
  71. GRB 070706B: Watcher upper limit
  72. GRB 060607B: Swift-BAT Refined Analysis
  73. GRB060602A: Swift/UVOT upper limits
  74. GCN 060607: Swift-UVOT obswervations.
  75. GRB 060607: Swift-BAT Refined Analysis
  76. GRB 060607: Swift-XRT Team refined analysis
  77. GRB 060607: IR observations
  78. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  79. VLT/UVES observations of GRB 060607
  80. GRB 060607: PROMPT Observations
  81. GRB 060607: REM NIR afterglow
  82. GRB 060522: PROMPT Optical Limits
  83. GRB 060605 BAT refined analysis
  84. GRB 060605: Xinglong TNT optical observations
  85. GRB060602B : REM infrared observations
  86. GRB060605: Swift/UVOT detections
  87. GRB 060605: Swift-XRT Team refined analysis
  88. SALT spectroscopy of GRB 060605
  89. GRB 060605: TNG optical observations
  90. GRB 060605: RTT150 optical observations
  91. GRB060605: Spectral Observations and Redshift
  92. GRB 060605: ROTSE-III Optical Counterpart
  93. GRB 060605: ROTSE-III Detection of Optical Counterpart
  94. GRB060604: Swift/UVOT detections
  95. GRB 060604: redshift
  96. GRB 060512: Keck Redshift
  97. GRB 060604 optical photometry
  98. GRB 060604: Swift-XRT Team refined analysis
  99. GRB 060604: BAT refined analysis
  100. GRB 060604A: ROTSE-III Optical Limits

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