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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"

39362 results found.

  1. GRB 110112A: Swift/UVOT upper limits
  2. GRB 110112A: WHT candidate afterglow/host galaxy
  3. GRB 110112A: MASTER optical observations
  4. GRB 110112A: Swift-BAT refined analysis
  5. GRB 110112A: Enhanced Swift-XRT position
  6. GRB 110106B: MASTER optical observations
  7. GRB110112A: TNT optical afterglow candidate
  8. GRB 110112A: Swift detection of a possible short burst
  9. GRB 110106B: early optical and near-IR observations
  10. GRB 110107A: Swift/UVOT upper limits
  11. GRB 101225a
  12. GRB 101219b. Possible radio afterglow detection.
  13. GRB 110106B: MASTER early optical observations
  14. GRB 110107A: Swift-XRT Afterglow Candidate
  15. GRB 110107A: Swift-BAT refined analysis
  16. GRB 110107A detected in ground analysis of BAT slew data
  17. GRB 101213A: Gemini-N galaxy redshift
  18. GRB 110106B: Fermi GBM detection
  19. Short GRB 110106A: MASTER OT observations
  20. GRB 110106B: Swift-XRT refined Analysis
  21. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  22. GRB 110106A: TNG NIR observations
  23. GRB 110106B Gemini-N galaxy redshift
  24. GRB 110106B: Liverpool Telescope observations
  25. GRB 110106A: ISAS-Kanazawa optical upper limit
  26. GRB 110106A: MITSuME Okayama optical upper limits
  27. GRB 110106B: WHT candidate afterglow
  28. GRB 110106B: Swift-BAT refined analysis
  29. GRB 110106B: Enhanced Swift-XRT position
  30. GRB 110106A: Swift/UVOT Upper Limits
  31. GRB 110106A: TNG redshift of the closeby galaxy
  32. GRB 110106A: Swift-XRT refined Analysis
  33. GRB110106B: Xinglong TNT upper limit
  34. GRB 110106A: Swift-BAT refined analysis
  35. GRB 110106A: Enhanced Swift-XRT position
  36. GRB 110106B: Swift detection of a burst
  37. GRB 110106A: TNG optical observations and candidate counterparts
  38. GRB 110106A: MASTER optical observations
  39. GRB 101225A: Keck redshift
  40. GRB110106A: Xinglong TNT upper limit
  41. GRB 110106A: Swift detection of a burst
  42. GRB 101225A: Host galaxy
  43. GRB 101219A: Gemini-North host redshift
  44. GRB 110102A: Swift-XRT refined Analysis
  45. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  46. Konus-Wind observation of GRB 110102A
  47. GRB110102A: Swift/UVOT observations
  48. GRB110102A: MITSuME Okayama Optical Observation
  49. GRB 110102A: Fermi GBM observation
  50. GRB 110102A: Swift-BAT refined analysis
  51. GRB 110102A: Enhanced Swift-XRT position
  52. GRB 110102A: Swift detection of a burst with an optical detection
  53. GRB 101225A: optical break from NOT observation
  54. GRB 101225A: MMT spectroscopy
  55. GRB 101225A: P60 Observations
  56. GRB 101225A: MAXI/GSC observations
  57. GRB 101225A Late-time emission observed by Swift-BAT
  58. GRB 101225: Optical follow-up of the Christmas burst
  59. GRB 101225A: WHT observations
  60. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  61. GRB 101225A, Swift-BAT refined analysis
  62. GRB 101225A: Swift/UVOT Detection
  63. GRB 101225A: Swift-XRT refined Analysis
  64. GRB 101225A: Enhanced Swift-XRT position
  65. Trigger 441015 / GRB 101225A: Further NOT optical observation
  66. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  67. GRB 101225A (Swift trigger 441015): optical upper limit
  68. Trigger 441015: Swift detection of a possible burst or transient
  69. GRB 101224A: NOT optical observation
  70. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  71. GRB 101224A: Swift/UVOT Upper Limits
  72. GRB 101224A: Fermi GBM observation
  73. GRB 101224A: Swift-XRT refined Analysis
  74. GRB101224A: MITSuME Okayama optical upper limits
  75. GRB 101224A, Swift-BAT refined analysis
  76. GRB 101224A - UVOT-enhanced XRT position
  77. GRB 101224A: Swift detection of a short burst
  78. GRB 101219A: Chandra Observations
  79. GRB 101219B: Swift/UVOT refined analysis
  80. GRB 101219B: Swift-XRT refined Analysis
  81. GRB 101219B: Enhanced Swift-XRT position
  82. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  83. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  84. GRB 101219B: Fermi GBM observation
  85. GRB 101219A: IAC80 optical observations
  86. GRB 101219B: Swift-BAT refined analysis
  87. GRB 101219A: Swift-XRT refined Analysis
  88. GRB 101219B: Swift detection of a burst with an optical afterglow
  89. GRB 101219A: Swift/UVOT Upper Limits
  90. GRB 101219A: GROND Upper limits
  91. Konus-Wind observation of short hard GRB 101219A
  92. GRB 101219A: Magellan NIR observations
  93. GRB 101219A: Further Gemini-South Imaging
  94. GRB 101219A: Swift-BAT refined analysis
  95. GRB 101219A - NOT observation - upper limit
  96. GRB 101219A: SARA-N Upper Limit
  97. GRB 101219A: Gemini-South observations
  98. GRB 101219A: REM optical and NIR observations
  99. GRB 101219A: ROTSE-III Optical Limits
  100. GRB 101219A: Swift detection of a short hard burst

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