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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"

43015 results found.

  1. GRB 101213A: Gemini-N galaxy redshift
  2. GRB 110106B: Fermi GBM detection
  3. Short GRB 110106A: MASTER OT observations
  4. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  5. GRB 110106B Gemini-N galaxy redshift
  6. GRB 110106A: ISAS-Kanazawa optical upper limit
  7. GRB 110106A: MITSuME Okayama optical upper limits
  8. GRB 110106B: WHT candidate afterglow
  9. GRB 110106B: Swift-BAT refined analysis
  10. GRB 110106B: Enhanced Swift-XRT position
  11. GRB 110106A: Swift/UVOT Upper Limits
  12. GRB 110106A: TNG redshift of the closeby galaxy
  13. GRB 110106A: Swift-XRT refined Analysis
  14. GRB110106B: Xinglong TNT upper limit
  15. GRB 110106A: Swift-BAT refined analysis
  16. GRB 110106A: Enhanced Swift-XRT position
  17. GRB 110106B: Swift detection of a burst
  18. GRB 110106A: TNG optical observations and candidate counterparts
  19. GRB 110106A: MASTER optical observations
  20. GRB 101225A: Keck redshift
  21. GRB110106A: Xinglong TNT upper limit
  22. GRB 110106A: Swift detection of a burst
  23. GRB 101225A: Host galaxy
  24. GRB 101219A: Gemini-North host redshift
  25. GRB 110102A: Swift-XRT refined Analysis
  26. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  27. Konus-Wind observation of GRB 110102A
  28. GRB110102A: Swift/UVOT observations
  29. GRB110102A: MITSuME Okayama Optical Observation
  30. GRB 110102A: Fermi GBM observation
  31. GRB 110102A: Swift-BAT refined analysis
  32. GRB 110102A: Enhanced Swift-XRT position
  33. GRB 110102A: Swift detection of a burst with an optical detection
  34. GRB 101225A: optical break from NOT observation
  35. GRB 101225A: MMT spectroscopy
  36. GRB 101225A: P60 Observations
  37. GRB 101225A: MAXI/GSC observations
  38. GRB 101225A Late-time emission observed by Swift-BAT
  39. GRB 101225: Optical follow-up of the Christmas burst
  40. GRB 101225A: WHT observations
  41. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  42. GRB 101225A, Swift-BAT refined analysis
  43. GRB 101225A: Swift/UVOT Detection
  44. GRB 101225A: Swift-XRT refined Analysis
  45. GRB 101225A: Enhanced Swift-XRT position
  46. Trigger 441015 / GRB 101225A: Further NOT optical observation
  47. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  48. Trigger 441015: Swift detection of a possible burst or transient
  49. GRB 101224A: NOT optical observation
  50. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  51. GRB 101224A: Swift/UVOT Upper Limits
  52. GRB 101224A: Fermi GBM observation
  53. GRB 101224A: Swift-XRT refined Analysis
  54. GRB101224A: MITSuME Okayama optical upper limits
  55. GRB 101224A, Swift-BAT refined analysis
  56. GRB 101224A - UVOT-enhanced XRT position
  57. GRB 101224A: Swift detection of a short burst
  58. GRB 101219A: Chandra Observations
  59. GRB 101219B: Swift/UVOT refined analysis
  60. GRB 101219B: Swift-XRT refined Analysis
  61. GRB 101219B: Enhanced Swift-XRT position
  62. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  63. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  64. GRB 101219B: Fermi GBM observation
  65. GRB 101219A: IAC80 optical observations
  66. GRB 101219B: Swift-BAT refined analysis
  67. GRB 101219A: Swift-XRT refined Analysis
  68. GRB 101219B: Swift detection of a burst with an optical afterglow
  69. GRB 101219A: Swift/UVOT Upper Limits
  70. GRB 101219A: GROND Upper limits
  71. Konus-Wind observation of short hard GRB 101219A
  72. GRB 101219A: Magellan NIR observations
  73. GRB 101219A: Further Gemini-South Imaging
  74. GRB 101219A: Swift-BAT refined analysis
  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. Request for Supernova related data for GRB 101023A
  82. GRB 101213A : Suzaku WAM observation of the prompt emission
  83. Redshift solution(s) for GRB101213A from Swift-XRT data
  84. Konus-Wind observation of GRB 101213A
  85. GRB 101213A: Fermi GBM observation
  86. GRB 101213A, Swift-BAT refined analysis
  87. GRB 101213A: Swift-XRT refined Analysis
  88. GRB 101213A: Swift/UVOT Upper Limits
  89. GRB 101213A: Enhanced Swift-XRT position
  90. GRB 101213: object within the X-ray error circle
  91. GRB 101213A: Swift detection of a burst
  92. GRB101204A: Swift/UVOT observations
  93. GRB 101204A: Swift-XRT refined Analysis
  94. GRB101204A GROND Detection of the Optical/NIR Afterglow
  95. GRB 101204A Afterglow Candidate, VATT Observations
  96. GRB 101129A : Suzaku WAM observation of the prompt emission
  97. GRB 101204A Swift-XRT/UVOT afterglow candidate
  98. Konus-Wind observation of GRB 101130A
  99. Konus-Wind observation of GRB 101129A
  100. IPN Localization of GRB101130 (possible short duration burst)

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