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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"

28221 results found.

  1. GRB 110128A: Afterglow detection from NOT
  2. GRB 110128A: Swift detection of a burst
  3. GRB 110123A: Fermi GBM detection
  4. GRB 110106B, radio observations
  5. GRB 110120A: Fermi LAT detection
  6. GRB 101225A: CQUEAN optical observation
  7. GRB 110106A: CrAO optical observations
  8. GRB 110119A: Fermi GBM detection
  9. GRB 110120A: Fermi GBM detection
  10. GRB 110112A: optical upper limit
  11. GRB110119: Swift/UVOT Detection
  12. GRB 110119A: Swift-XRT refined Analysis
  13. GRB110119A: MITSuME Okayama optical upper limits
  14. GRB 110119A: PAIRITEL NIR Afterglow Detection
  15. GRB 110119A: Enhanced Swift-XRT position
  16. GRB 110119A: Swift detection of a burst with an optical detection
  17. GRB110106A, mm-radio observations
  18. GRB 101219B: tentative redshift and spectroscopic supernova detection
  19. GRB 101219B: GROND detection of a SN signature
  20. Swift-BAT trigger 442771 is a noise fluctuation
  21. Swift-BAT Trigger 442539 is not a GRB
  22. Swift Trigger 442539 is probably not a GRB
  23. GRB101225A - timing analysis
  24. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  25. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  26. GRB 110107A: Swift-XRT afterglow confirmation
  27. GRB 110112B: A short GRB detected by INTEGRAL
  28. GRB 110112A: Swift-XRT refined Analysis
  29. GRB 110112A: Swift/UVOT upper limits
  30. GRB 110112A: WHT candidate afterglow/host galaxy
  31. GRB 110112A: Enhanced Swift-XRT position
  32. GRB110112A: TNT optical afterglow candidate
  33. GRB 110112A: Swift detection of a possible short burst
  34. GRB 110106B: early optical and near-IR observations
  35. GRB 110107A: Swift/UVOT upper limits
  36. GRB 101225a
  37. GRB 101219b. Possible radio afterglow detection.
  38. GRB 110107A: Swift-XRT Afterglow Candidate
  39. GRB 101213A: Gemini-N galaxy redshift
  40. GRB 110106B: Fermi GBM detection
  41. Short GRB 110106A: MASTER OT observations
  42. GRB 110106B: Swift-XRT refined Analysis
  43. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  44. GRB 110106B Gemini-N galaxy redshift
  45. GRB 110106B: Liverpool Telescope observations
  46. GRB 110106A: MITSuME Okayama optical upper limits
  47. GRB 110106B: WHT candidate afterglow
  48. GRB 110106B: Enhanced Swift-XRT position
  49. GRB 110106A: Swift/UVOT Upper Limits
  50. GRB 110106A: TNG redshift of the closeby galaxy
  51. GRB 110106A: Swift-XRT refined Analysis
  52. GRB 110106A: Enhanced Swift-XRT position
  53. GRB 110106B: Swift detection of a burst
  54. GRB 110106A: TNG optical observations and candidate counterparts
  55. GRB 110106A: MASTER optical observations
  56. GRB 110106A: Swift detection of a burst
  57. GRB 101219A: Gemini-North host redshift
  58. GRB 110102A: Swift-XRT refined Analysis
  59. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  60. GRB110102A: Swift/UVOT observations
  61. GRB110102A: MITSuME Okayama Optical Observation
  62. GRB 110102A: Enhanced Swift-XRT position
  63. GRB 110102A: Swift detection of a burst with an optical detection
  64. GRB 101225A: optical break from NOT observation
  65. GRB 101225A: MMT spectroscopy
  66. GRB 101225A: P60 Observations
  67. GRB 101225A: MAXI/GSC observations
  68. GRB 101225A Late-time emission observed by Swift-BAT
  69. GRB 101225: Optical follow-up of the Christmas burst
  70. GRB 101225A: WHT observations
  71. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  72. GRB 101225A: Swift/UVOT Detection
  73. GRB 101225A: Swift-XRT refined Analysis
  74. GRB 101225A: Enhanced Swift-XRT position
  75. Trigger 441015 / GRB 101225A: Further NOT optical observation
  76. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  77. GRB 101225A (Swift trigger 441015): optical upper limit
  78. Trigger 441015: Swift detection of a possible burst or transient
  79. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  80. GRB 101224A: Swift/UVOT Upper Limits
  81. GRB 101224A: Swift-XRT refined Analysis
  82. GRB101224A: MITSuME Okayama optical upper limits
  83. GRB 101224A - UVOT-enhanced XRT position
  84. GRB 101224A: Swift detection of a short burst
  85. GRB 101219A: Chandra Observations
  86. GRB 101219B: Swift/UVOT refined analysis
  87. GRB 101219B: Swift-XRT refined Analysis
  88. GRB 101219B: Enhanced Swift-XRT position
  89. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  90. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  91. GRB 101219A: IAC80 optical observations
  92. GRB 101219A: Swift-XRT refined Analysis
  93. GRB 101219B: Swift detection of a burst with an optical afterglow
  94. GRB 101219A: Swift/UVOT Upper Limits
  95. GRB 101219A: GROND Upper limits
  96. GRB 101219A: Magellan NIR observations
  97. GRB 101219A: Further Gemini-South Imaging
  98. GRB 101219A - NOT observation - upper limit
  99. GRB 101219A: SARA-N Upper Limit
  100. GRB 101219A: Gemini-South observations

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