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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"

28198 results found.

  1. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  2. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  3. GRB 110107A: Swift-XRT afterglow confirmation
  4. GRB 110112B: A short GRB detected by INTEGRAL
  5. GRB 110112A: Swift-XRT refined Analysis
  6. GRB 110112A: Swift/UVOT upper limits
  7. GRB 110112A: WHT candidate afterglow/host galaxy
  8. GRB 110112A: Enhanced Swift-XRT position
  9. GRB110112A: TNT optical afterglow candidate
  10. GRB 110112A: Swift detection of a possible short burst
  11. GRB 110106B: early optical and near-IR observations
  12. GRB 110107A: Swift/UVOT upper limits
  13. GRB 101225a
  14. GRB 101219b. Possible radio afterglow detection.
  15. GRB 110107A: Swift-XRT Afterglow Candidate
  16. GRB 101213A: Gemini-N galaxy redshift
  17. GRB 110106B: Fermi GBM detection
  18. Short GRB 110106A: MASTER OT observations
  19. GRB 110106B: Swift-XRT refined Analysis
  20. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  21. GRB 110106B Gemini-N galaxy redshift
  22. GRB 110106B: Liverpool Telescope observations
  23. GRB 110106A: MITSuME Okayama optical upper limits
  24. GRB 110106B: WHT candidate afterglow
  25. GRB 110106B: Enhanced Swift-XRT position
  26. GRB 110106A: Swift/UVOT Upper Limits
  27. GRB 110106A: TNG redshift of the closeby galaxy
  28. GRB 110106A: Swift-XRT refined Analysis
  29. GRB 110106A: Enhanced Swift-XRT position
  30. GRB 110106B: Swift detection of a burst
  31. GRB 110106A: TNG optical observations and candidate counterparts
  32. GRB 110106A: MASTER optical observations
  33. GRB 110106A: Swift detection of a burst
  34. GRB 101219A: Gemini-North host redshift
  35. GRB 110102A: Swift-XRT refined Analysis
  36. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  37. GRB110102A: Swift/UVOT observations
  38. GRB110102A: MITSuME Okayama Optical Observation
  39. GRB 110102A: Enhanced Swift-XRT position
  40. GRB 110102A: Swift detection of a burst with an optical detection
  41. GRB 101225A: optical break from NOT observation
  42. GRB 101225A: MMT spectroscopy
  43. GRB 101225A: P60 Observations
  44. GRB 101225A: MAXI/GSC observations
  45. GRB 101225A Late-time emission observed by Swift-BAT
  46. GRB 101225: Optical follow-up of the Christmas burst
  47. GRB 101225A: WHT observations
  48. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  49. GRB 101225A: Swift/UVOT Detection
  50. GRB 101225A: Swift-XRT refined Analysis
  51. GRB 101225A: Enhanced Swift-XRT position
  52. Trigger 441015 / GRB 101225A: Further NOT optical observation
  53. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  54. GRB 101225A (Swift trigger 441015): optical upper limit
  55. Trigger 441015: Swift detection of a possible burst or transient
  56. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  57. GRB 101224A: Swift/UVOT Upper Limits
  58. GRB 101224A: Swift-XRT refined Analysis
  59. GRB101224A: MITSuME Okayama optical upper limits
  60. GRB 101224A - UVOT-enhanced XRT position
  61. GRB 101224A: Swift detection of a short burst
  62. GRB 101219A: Chandra Observations
  63. GRB 101219B: Swift/UVOT refined analysis
  64. GRB 101219B: Swift-XRT refined Analysis
  65. GRB 101219B: Enhanced Swift-XRT position
  66. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  67. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  68. GRB 101219A: IAC80 optical observations
  69. GRB 101219A: Swift-XRT refined Analysis
  70. GRB 101219B: Swift detection of a burst with an optical afterglow
  71. GRB 101219A: Swift/UVOT Upper Limits
  72. GRB 101219A: GROND Upper limits
  73. GRB 101219A: Magellan NIR observations
  74. GRB 101219A: Further Gemini-South Imaging
  75. GRB 101219A - NOT observation - upper limit
  76. GRB 101219A: SARA-N Upper Limit
  77. GRB 101219A: Gemini-South observations
  78. GRB 101219A: REM optical and NIR observations
  79. GRB 101219A: ROTSE-III Optical Limits
  80. GRB 101219A: Swift detection of a short hard burst
  81. Redshift solution(s) for GRB101213A from Swift-XRT data
  82. GRB 101213A: Swift-XRT refined Analysis
  83. GRB 101213A: Swift/UVOT Upper Limits
  84. GRB 101213A: Enhanced Swift-XRT position
  85. GRB 101213: object within the X-ray error circle
  86. GRB 101213A: Swift detection of a burst
  87. GRB101204A: Swift/UVOT observations
  88. GRB 101204A: Swift-XRT refined Analysis
  89. GRB101204A GROND Detection of the Optical/NIR Afterglow
  90. GRB 101204A Afterglow Candidate, VATT Observations
  91. GRB 101204A Swift-XRT/UVOT afterglow candidate
  92. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  93. GRB 101201A: Swift-XRT refined Analysis
  94. GRB 101201A: Swift/UVOT Detection
  95. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  96. GRB 101201A detected in ground analysis of BAT data
  97. Swift detection of MAXIJ1409-619
  98. GRB 101123A: Fermi GBM detection
  99. Optical observation of GRB 101024A
  100. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow

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