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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"

28230 results found.

  1. GRB 110106B: Swift-XRT refined Analysis
  2. GRB 110106A: TNG NIR observations
  3. GRB 110106A: ISAS-Kanazawa optical upper limit
  4. GRB 110106A: MITSuME Okayama optical upper limits
  5. GRB 110106B: Swift-BAT refined analysis
  6. GRB 110106B: Enhanced Swift-XRT position
  7. GRB 110106A: Swift/UVOT Upper Limits
  8. GRB 110106A: TNG redshift of the closeby galaxy
  9. GRB 110106A: Swift-XRT refined Analysis
  10. GRB 110106A: Swift-BAT refined analysis
  11. GRB 110106A: Enhanced Swift-XRT position
  12. GRB 110106B: Swift detection of a burst
  13. GRB 110106A: TNG optical observations and candidate counterparts
  14. GRB 110106A: Swift detection of a burst
  15. GRB 101225A: Host galaxy
  16. GRB 110102A: Swift-XRT refined Analysis
  17. GRB110102A: Swift/UVOT observations
  18. GRB110102A: MITSuME Okayama Optical Observation
  19. GRB 110102A: Fermi GBM observation
  20. GRB 110102A: Swift-BAT refined analysis
  21. GRB 110102A: Enhanced Swift-XRT position
  22. GRB 110102A: Swift detection of a burst with an optical detection
  23. GRB 101225A: optical break from NOT observation
  24. GRB 101225A: P60 Observations
  25. GRB 101225A: MAXI/GSC observations
  26. GRB 101225A Late-time emission observed by Swift-BAT
  27. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  28. GRB 101225A, Swift-BAT refined analysis
  29. GRB 101225A: Swift/UVOT Detection
  30. GRB 101225A: Swift-XRT refined Analysis
  31. GRB 101225A: Enhanced Swift-XRT position
  32. Trigger 441015 / GRB 101225A: Further NOT optical observation
  33. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  34. GRB 101225A (Swift trigger 441015): optical upper limit
  35. Trigger 441015: Swift detection of a possible burst or transient
  36. GRB 101224A: NOT optical observation
  37. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  38. GRB 101224A: Swift/UVOT Upper Limits
  39. GRB 101224A: Swift-XRT refined Analysis
  40. GRB101224A: MITSuME Okayama optical upper limits
  41. GRB 101224A, Swift-BAT refined analysis
  42. GRB 101224A - UVOT-enhanced XRT position
  43. GRB 101224A: Swift detection of a short burst
  44. GRB 101219A: Chandra Observations
  45. GRB 101219B: Swift/UVOT refined analysis
  46. GRB 101219B: Swift-XRT refined Analysis
  47. GRB 101219B: Enhanced Swift-XRT position
  48. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  49. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  50. GRB 101219B: Fermi GBM observation
  51. GRB 101219A: IAC80 optical observations
  52. GRB 101219B: Swift-BAT refined analysis
  53. GRB 101219A: Swift-XRT refined Analysis
  54. GRB 101219B: Swift detection of a burst with an optical afterglow
  55. GRB 101219A: Swift/UVOT Upper Limits
  56. GRB 101219A: GROND Upper limits
  57. GRB 101219A: Magellan NIR observations
  58. GRB 101219A: Further Gemini-South Imaging
  59. GRB 101219A: Swift-BAT refined analysis
  60. GRB 101219A - NOT observation - upper limit
  61. GRB 101219A: SARA-N Upper Limit
  62. GRB 101219A: REM optical and NIR observations
  63. GRB 101219A: Swift detection of a short hard burst
  64. GRB 101213A : Suzaku WAM observation of the prompt emission
  65. Redshift solution(s) for GRB101213A from Swift-XRT data
  66. XRF 101117A, RIMOTS optical upper limits
  67. GRB 101213A: Fermi GBM observation
  68. GRB 101213A, Swift-BAT refined analysis
  69. GRB 101213A: Swift-XRT refined Analysis
  70. GRB 101213A: Swift/UVOT Upper Limits
  71. GRB 101213A: Enhanced Swift-XRT position
  72. GRB 101213: object within the X-ray error circle
  73. GRB 101213A: Swift detection of a burst
  74. GRB101204A: Swift/UVOT observations
  75. GRB 101204A: Swift-XRT refined Analysis
  76. GRB101204A GROND Detection of the Optical/NIR Afterglow
  77. GRB 101204A Afterglow Candidate, VATT Observations
  78. GRB 101129A : Suzaku WAM observation of the prompt emission
  79. GRB 101204A Swift-XRT/UVOT afterglow candidate
  80. Konus-Wind observation of GRB 101130A
  81. GRB101030A
  82. GRB 101201A: Fermi GBM observation
  83. GRB 101201A: Swift-XRT refined Analysis
  84. GRB 101201A: Swift/UVOT Detection
  85. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  86. GRB 101123A: ROTSE optical observations
  87. GRB 101123A: MASTER prompt optical observations
  88. GRB 101123A: Fermi GBM detection
  89. GRB 101117B: GROND Upper limits
  90. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  91. GRB 101112A: OSN and BTA observations
  92. XRF 101117A: Palomar Transient Factory Observations
  93. GRB 101117B: Swift-XRT refined analysis
  94. GRB101114A: Swift/UVOT Upper Limits
  95. GRB 101117B: Swift-BAT refined analysis
  96. GRB 101117B: Enhanced Swift-XRT position
  97. GRB 101117B: Swift detection of a burst
  98. GRB 101114A: GROND Upper limits
  99. Konus-Wind observation of GRB 101114A
  100. Fermi GBM detection of a burst from a galactic source

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