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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"

31741 results found.

  1. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  2. GRB060801: Radio Observations
  3. GRB 051109B: Bright spiral host galaxy at low redshift
  4. GRB 060801: optical observations at FORS2/VLT
  5. GRB060801: Swift/UVOT Upper Limits
  6. GRB 060801: optical observations at Hanle and Calar Alto
  7. GRB060801: optical upper limit in R
  8. GRB 060801: Swift XRT refined analysis
  9. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  10. GRB 060801, optical observation
  11. GRB 060801: Kanazawa Optical Observation
  12. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  13. GRB 060218 / SN 2006aj Nebular Spectrum
  14. GRB 060729 redshift
  15. GRB 060719: TORTOREM optical upper limits
  16. GRB 060729: Swift/UVOT Detections
  17. GRB 060729: Refined analysis of the Swift-BAT burst
  18. GRB 060729: Swift-XRT refined analysis
  19. GRB 060729: Swift/UVOT Observations
  20. GRB 060729: ROTSE-III Detection of Optical Counterpart
  21. GRB 060728: Swift/UVOT Upper Limits
  22. GRB 060728: Refined analysis of the Swift-BAT burst
  23. GRB 060728, SMARTS optical/IR observations
  24. Swift/XRT preliminary analysis
  25. GRB060614 ATCA Radio Limits
  26. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  27. GRB 060714: Swift/UVOT Observations
  28. GRB060719: prompt NIR observations with REM
  29. GRB 060714: NOT observations
  30. GRB 060719: near-infrared afterglow
  31. GRB 060719: correction to the coordinates reported in GCN 5347
  32. GRB 060522: VLA observation
  33. GRB 060719: Swift/UVOT Upper Limits
  34. GRB 060719: VLT/ISAAC observations
  35. GRB 060719: Refined analysis of the Swift-BAT burst
  36. GRB 060719: XRT refined analysis
  37. GRB 060719: further analysis of VLT observations
  38. GRB 060719: prompt PROMPT observations
  39. GRB060719: REM NIR Observations
  40. GRB 060719: Continued LCO optical observations
  41. GRB 060719: VLT observations
  42. GRB 060717: Swift XRT refined analysis
  43. GRB 060714: OA fading and a possible host detection
  44. GRB 060717: NOT observations
  45. GRB 060714: Refined analysis of the Swift-BAT burst
  46. GRB 060717 optical upper limit
  47. GRB060717: Swift/UVOT upper limits
  48. GRB 060717: Swift XRT refined position
  49. GRB 060717: Swift-BAT refined analysis
  50. GRB060717 - SDSS Pre-burst Observations
  51. GRB 060714: REM infrared observations
  52. GRB 060717, optical observation
  53. GRB060714: correction to GCN 5324
  54. GRB 060714, SMARTS optical/IR afterglow observation
  55. GRB 060714 : Liverpool Telescope Observations
  56. GRB 060714: Swift XRT refined analysis
  57. GRB 060714: OA redshift
  58. GRB 060708: VLT spectroscopy
  59. GRB060708: MARGE low resolution spectrum observations
  60. Swift-BAT trigger 219136 is not a GRB
  61. Correction to Circular 5314: Circular refers to GRB 060714
  62. GRB060707 possible optical confirmation
  63. GRB 060714, optical observation
  64. GRB 060605: SkyNet Optical Limits
  65. GRB060712: P60 Observations
  66. GRB 060712: Swift/UVOT Upper Limits
  67. GRB 060712: Refined analysis of the Swift-BAT burst
  68. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  69. GRB 060708: PROMPT Optical Limits
  70. GRB 060707: OA fading and redshift
  71. GRB 060708: Swift-XRT refined analysis
  72. GCN 060708: Swift-UVOT Observations
  73. GRB 060708: Refined analysis of the Swift-BAT burst
  74. GCN 060707: Swift-UVOT observations
  75. GRB 060707: Swift-XRT refined analysis
  76. GRB060707 possible optical confirmation
  77. GRB 060707: Refined analysis of the Swift-BAT burst
  78. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  79. GRB 060515: Upper Limit on Host Galaxy
  80. GRB 050223: Magellan redshift
  81. GRB 060614: SMARTS host galaxy observations
  82. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  83. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  84. GRB 060109: Upper Limit on Host Galaxy
  85. GRB 060105: Upper limit on Host Galaxy
  86. GRB060614: Detection of the host galaxy but no supernova emission
  87. GRB 060614: redshift confirmation
  88. GRB 060614: Redshift
  89. Swift-BAT trigger 215279 is not a GRB
  90. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  91. GRB060614: Optical observations
  92. GRB 060614: spectroscopy
  93. GRB050326: Host Galaxy Candidates
  94. GRB050124: Possible Host Galaxy
  95. GRB050223: Host Galaxy
  96. GRB060512: near IR observations
  97. Konus-Wind observation of GRB 060614
  98. GRB060605: optical observation
  99. The Unusually Long-Lived Afterglow of GRB 060614
  100. GRB 060614: optical observations

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