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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"

28237 results found.

  1. GRB 110112A: Enhanced Swift-XRT position
  2. GRB110112A: TNT optical afterglow candidate
  3. GRB 110112A: Swift detection of a possible short burst
  4. GRB 110107A: Swift/UVOT upper limits
  5. GRB 101219b. Possible radio afterglow detection.
  6. GRB 110107A: Swift-XRT Afterglow Candidate
  7. GRB 110106B: Fermi GBM detection
  8. GRB 110106B: Swift-XRT refined Analysis
  9. GRB 110106A: TNG NIR observations
  10. GRB 110106A: ISAS-Kanazawa optical upper limit
  11. GRB 110106A: MITSuME Okayama optical upper limits
  12. GRB 110106B: Swift-BAT refined analysis
  13. GRB 110106B: Enhanced Swift-XRT position
  14. GRB 110106A: Swift/UVOT Upper Limits
  15. GRB 110106A: TNG redshift of the closeby galaxy
  16. GRB 110106A: Swift-XRT refined Analysis
  17. GRB 110106A: Swift-BAT refined analysis
  18. GRB 110106A: Enhanced Swift-XRT position
  19. GRB 110106B: Swift detection of a burst
  20. GRB 110106A: TNG optical observations and candidate counterparts
  21. GRB 110106A: Swift detection of a burst
  22. GRB 101225A: Host galaxy
  23. GRB 110102A: Swift-XRT refined Analysis
  24. GRB110102A: Swift/UVOT observations
  25. GRB110102A: MITSuME Okayama Optical Observation
  26. GRB 110102A: Fermi GBM observation
  27. GRB 110102A: Swift-BAT refined analysis
  28. GRB 110102A: Enhanced Swift-XRT position
  29. GRB 110102A: Swift detection of a burst with an optical detection
  30. GRB 101225A: optical break from NOT observation
  31. GRB 101225A: P60 Observations
  32. GRB 101225A: MAXI/GSC observations
  33. GRB 101225A Late-time emission observed by Swift-BAT
  34. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  35. GRB 101225A, Swift-BAT refined analysis
  36. GRB 101225A: Swift/UVOT Detection
  37. GRB 101225A: Swift-XRT refined Analysis
  38. GRB 101225A: Enhanced Swift-XRT position
  39. Trigger 441015 / GRB 101225A: Further NOT optical observation
  40. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  41. GRB 101225A (Swift trigger 441015): optical upper limit
  42. Trigger 441015: Swift detection of a possible burst or transient
  43. GRB 101224A: NOT optical observation
  44. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  45. GRB 101224A: Swift/UVOT Upper Limits
  46. GRB 101224A: Swift-XRT refined Analysis
  47. GRB101224A: MITSuME Okayama optical upper limits
  48. GRB 101224A, Swift-BAT refined analysis
  49. GRB 101224A - UVOT-enhanced XRT position
  50. GRB 101224A: Swift detection of a short burst
  51. GRB 101219A: Chandra Observations
  52. GRB 101219B: Swift/UVOT refined analysis
  53. GRB 101219B: Swift-XRT refined Analysis
  54. GRB 101219B: Enhanced Swift-XRT position
  55. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  56. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  57. GRB 101219B: Fermi GBM observation
  58. GRB 101219A: IAC80 optical observations
  59. GRB 101219B: Swift-BAT refined analysis
  60. GRB 101219A: Swift-XRT refined Analysis
  61. GRB 101219B: Swift detection of a burst with an optical afterglow
  62. GRB 101219A: Swift/UVOT Upper Limits
  63. GRB 101219A: GROND Upper limits
  64. GRB 101219A: Magellan NIR observations
  65. GRB 101219A: Further Gemini-South Imaging
  66. GRB 101219A: Swift-BAT refined analysis
  67. GRB 101219A - NOT observation - upper limit
  68. GRB 101219A: SARA-N Upper Limit
  69. GRB 101219A: REM optical and NIR observations
  70. GRB 101219A: Swift detection of a short hard burst
  71. GRB 101213A : Suzaku WAM observation of the prompt emission
  72. Redshift solution(s) for GRB101213A from Swift-XRT data
  73. XRF 101117A, RIMOTS optical upper limits
  74. GRB 101213A: Fermi GBM observation
  75. GRB 101213A, Swift-BAT refined analysis
  76. GRB 101213A: Swift-XRT refined Analysis
  77. GRB 101213A: Swift/UVOT Upper Limits
  78. GRB 101213A: Enhanced Swift-XRT position
  79. GRB 101213: object within the X-ray error circle
  80. GRB 101213A: Swift detection of a burst
  81. GRB101204A: Swift/UVOT observations
  82. GRB 101204A: Swift-XRT refined Analysis
  83. GRB101204A GROND Detection of the Optical/NIR Afterglow
  84. GRB 101204A Afterglow Candidate, VATT Observations
  85. GRB 101129A : Suzaku WAM observation of the prompt emission
  86. GRB 101204A Swift-XRT/UVOT afterglow candidate
  87. Konus-Wind observation of GRB 101130A
  88. GRB101030A
  89. GRB 101201A: Fermi GBM observation
  90. GRB 101201A: Swift-XRT refined Analysis
  91. GRB 101201A: Swift/UVOT Detection
  92. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  93. GRB 101123A: ROTSE optical observations
  94. GRB 101123A: MASTER prompt optical observations
  95. GRB 101123A: Fermi GBM detection
  96. GRB 101117B: GROND Upper limits
  97. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  98. GRB 101112A: OSN and BTA observations
  99. XRF 101117A: Palomar Transient Factory Observations
  100. GRB 101117B: Swift-XRT refined analysis

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