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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"

45942 results found.

  1. GRB 110107A: Swift-XRT afterglow confirmation
  2. GRB 101225A: HST observations - no host detected
  3. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  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: MASTER optical observations
  9. GRB 110112A: Swift-BAT refined analysis
  10. GRB 110112A: Enhanced Swift-XRT position
  11. GRB 110106B: MASTER optical observations
  12. GRB110112A: TNT optical afterglow candidate
  13. GRB 110112A: Swift detection of a possible short burst
  14. GRB 110106B: early optical and near-IR observations
  15. GRB 110107A: Swift/UVOT upper limits
  16. GRB 101225a
  17. GRB 101219b. Possible radio afterglow detection.
  18. GRB 110106B: MASTER early optical observations
  19. GRB 110107A: Swift-XRT Afterglow Candidate
  20. GRB 110107A: Swift-BAT refined analysis
  21. GRB 110107A detected in ground analysis of BAT slew data
  22. GRB 101213A: Gemini-N galaxy redshift
  23. GRB 110106B: Fermi GBM detection
  24. Short GRB 110106A: MASTER OT observations
  25. GRB 110106B: Swift-XRT refined Analysis
  26. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  27. GRB 110106A: TNG NIR observations
  28. GRB 110106B Gemini-N galaxy redshift
  29. GRB 110106B: Liverpool Telescope observations
  30. GRB 110106A: ISAS-Kanazawa optical upper limit
  31. GRB 110106A: MITSuME Okayama optical upper limits
  32. GRB 110106B: WHT candidate afterglow
  33. GRB 110106B: Swift-BAT refined analysis
  34. GRB 110106B: Enhanced Swift-XRT position
  35. GRB 110106A: Swift/UVOT Upper Limits
  36. GRB 110106A: TNG redshift of the closeby galaxy
  37. GRB 110106A: Swift-XRT refined Analysis
  38. GRB110106B: Xinglong TNT upper limit
  39. GRB 110106A: Swift-BAT refined analysis
  40. GRB 110106A: Enhanced Swift-XRT position
  41. GRB 110106B: Swift detection of a burst
  42. GRB 110106A: TNG optical observations and candidate counterparts
  43. GRB 110106A: MASTER optical observations
  44. GRB 101225A: Keck redshift
  45. GRB110106A: Xinglong TNT upper limit
  46. GRB 110106A: Swift detection of a burst
  47. GRB 101225A: Host galaxy
  48. GRB 101219A: Gemini-North host redshift
  49. GRB 110102A: Swift-XRT refined Analysis
  50. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  51. Konus-Wind observation of GRB 110102A
  52. GRB110102A: Swift/UVOT observations
  53. GRB110102A: MITSuME Okayama Optical Observation
  54. GRB 110102A: Fermi GBM observation
  55. GRB 110102A: Swift-BAT refined analysis
  56. GRB 110102A: Enhanced Swift-XRT position
  57. GRB 110102A: Swift detection of a burst with an optical detection
  58. GRB 101225A: optical break from NOT observation
  59. GRB 101225A: MMT spectroscopy
  60. GRB 101225A: P60 Observations
  61. GRB 101225A: MAXI/GSC observations
  62. GRB 101225A Late-time emission observed by Swift-BAT
  63. GRB 101225: Optical follow-up of the Christmas burst
  64. GRB 101225A: WHT observations
  65. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  66. GRB 101225A, Swift-BAT refined analysis
  67. GRB 101225A: Swift/UVOT Detection
  68. GRB 101225A: Swift-XRT refined Analysis
  69. GRB 101225A: Enhanced Swift-XRT position
  70. Trigger 441015 / GRB 101225A: Further NOT optical observation
  71. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  72. GRB 101225A (Swift trigger 441015): optical upper limit
  73. Trigger 441015: Swift detection of a possible burst or transient
  74. GRB 101224A: NOT optical observation
  75. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  76. GRB 101224A: Swift/UVOT Upper Limits
  77. GRB 101224A: Fermi GBM observation
  78. GRB 101224A: Swift-XRT refined Analysis
  79. GRB101224A: MITSuME Okayama optical upper limits
  80. GRB 101224A, Swift-BAT refined analysis
  81. GRB 101224A - UVOT-enhanced XRT position
  82. GRB 101224A: Swift detection of a short burst
  83. GRB 101219A: Chandra Observations
  84. GRB 101219B: Swift/UVOT refined analysis
  85. GRB 101219B: Swift-XRT refined Analysis
  86. GRB 101219B: Enhanced Swift-XRT position
  87. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  88. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  89. GRB 101219B: Fermi GBM observation
  90. GRB 101219A: IAC80 optical observations
  91. GRB 101219B: Swift-BAT refined analysis
  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. Konus-Wind observation of short hard GRB 101219A
  97. GRB 101219A: Magellan NIR observations
  98. GRB 101219A: Further Gemini-South Imaging
  99. GRB 101219A: Swift-BAT refined analysis
  100. GRB 101219A - NOT observation - upper limit

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