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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"

3344 results found.

  1. GRB 060719: near-infrared afterglow
  2. GRB 060719: VLT/ISAAC observations
  3. GRB 060719: XRT refined analysis
  4. GRB 060717: Swift XRT refined analysis
  5. GRB 060714: Swift XRT refined analysis
  6. GRB 060712: XRT refined analysis
  7. GRB 060712: XRT refined position
  8. GRB 060708: Swift-XRT refined analysis
  9. GRB 060707: Swift-XRT refined analysis
  10. GRB050326: Host Galaxy Candidates
  11. GRB050124: Possible Host Galaxy
  12. GRB050223: Host Galaxy
  13. GRB060512: near IR observations
  14. GRB060614: Swift-XRT refined analysis
  15. GRB 060602A: Swift/XRT analysis
  16. GRB 060605: Swift-XRT Team refined analysis
  17. GRB 060604: Swift-XRT Team refined analysis
  18. GRB 060526: Break in X-ray light curve
  19. XMM-Newton observation of GRB060510b
  20. GRB 060515: NIR observation
  21. GRB060515: P200 NIR Observations
  22. GRB 060515: Swift/XRT Team refined analysis
  23. GRB 060515: Swift/XRT position
  24. GRB 060512: Subaru NIR observation
  25. GRB060512: Swift XRT Team refined analysis
  26. GRB 060512: Detection of NIR afterglow
  27. GRB 060505: X-ray afterglow - Correction -
  28. GRB 060505: X-ray afterglow
  29. GRB060510B: Swift XRT refined analysis
  30. GRB060510A: XRT refined analysis
  31. GRB060502B: improvement in the XRT afterglow position
  32. GRB 060505: Swift XRT Team Refined Analysis
  33. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  34. GRB 060505: Swift XRT afterglow canditate position
  35. GRB060502B: Swift XRT Team refined analysis
  36. GRB060502: Swift-XRT refined analysis
  37. GRB060428B: Swift XRT Team refined analysis
  38. GRB 060421: Swift-XRT refined analysis
  39. Erratum of GCN 4983 for GRB 060418 IR follow-up
  40. GRB 060418 : IR afterglow observations
  41. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  42. GRB060418: Swift XRT Team Refined Analysis
  43. GRB060403: XRT refined analysis
  44. GRB 060322: Confirmation of Swift XRT afterglow
  45. GRB 060322: Swift XRT afterglow candidate
  46. GRB 060313: early afterglow NIR upper limits with REM
  47. GRB 060312: Swift XRT team refined analysis
  48. GRB060306: APO Ks-band Imaging Observations
  49. GRB 060306: SOAR Ks Observations
  50. GRB060218: analysis of the XMM-Newton observation
  51. GRB 060223B: Swift XRT possible afterglow
  52. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  53. GRB 060219: Swift-XRT Team refined analysis
  54. GRB 051221B: Swift-XRT Team Refined Analysis
  55. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  56. GRB 060211B: Swift-XRT Team refined analysis
  57. GRB060210: Swift XRT Refined Analysis
  58. GRB 060206: near-infrared observations (JK' imaging)
  59. GRB 060206: IR Detection of the Afterglow
  60. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  61. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  62. Swift XRT Observation of GRB 060204C
  63. GRB060204B: Swift XRT Team Refined Analysis
  64. GRB 060203: IR Counterpart
  65. Swift BAT Trigger 180151: Swift XRT source detection
  66. GRB 060121: Confirmation of NIR Afterglow
  67. GRB 060123: Swift refined analysis of an unusual GRB
  68. GRB060105: refined analysis of the Suzaku observation
  69. GRB 060121: Probable Detection of NIR Afterglow
  70. GRB060124: detailed XRT analysis
  71. GRB060123: Optical and IR Imaging
  72. GRB 060123: Swift detection of a very long, faint burst
  73. GRB 060121: Swift/UVOT upper limits
  74. GRB 060121: Swift XRT refined analysis
  75. GRB 060121: Swift XRT refined position
  76. GRB 060121: Infrared Observations
  77. GRB 060116: possible I-J dropout
  78. GRB 060110: XRT position and analysis
  79. GRB 060114: Swift XRT upper limit
  80. GRB 060108: further analysis of VLT images
  81. GRB 060111B: Swift XRT refined analysis
  82. GRB060111 : XRT refined analysis
  83. GRB 060110: IR Candidate Afterglow
  84. GRB 060108: ISAS early observations and near IR upper limit
  85. GRB060108: P200 Ks Observations
  86. GRB 060105: ISAS observations and near IR upper limit
  87. Swift-BAT trigger 175653 is not an astrophysical source
  88. GRB051016: analysis of the XMM-Newton observation
  89. GRB 051221A: Chandra Afterglow Position
  90. GRB 051221: Swift XRT refined analysis
  91. GRB 051215: near-infrared observations
  92. GRB 051211B: Swift XRT confirmation of the afterglow
  93. GRB 051211B: Swift XRT Observations
  94. GRB 051210: Swift XRT refined analysis
  95. GRB 051117b: NIR observations
  96. GRB051117A : XRT refined analysis
  97. GRB051114: results of the Swift-XRT observation
  98. GRB051111: XRT preliminary analysis
  99. GRB 051111a: IR photometry
  100. GRB051109B: XRT refined analysis

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