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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"

26119 results found.

  1. GRB 070110: VLT R-band photometry
  2. GRB 070110 declared a "Burst of Interest" by Swift team
  3. Further Retractions of previous Swift-BAT triggers
  4. Swift-BAT Trigger 255685 is not a GRB
  5. Trigger 255685: Swift detection of a possible burst
  6. GRB 070110: VLT absorption redshift
  7. GRB 070110: UVOT Observations of a Candidate Afterglow
  8. GRB070110: Swift XRT Team refined analysis
  9. GRB 070110, Swift-BAT refined analysis
  10. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  11. GRB 070110: Swift detection of a burst with a possible optical afterglow
  12. GRB070107: Swift/XRT refined analysis
  13. GRB 070107: Possible UVOT Afterglow
  14. GRB 070107, Swift-BAT refined analysis
  15. GRB 070107: Swift/XRT position
  16. GRB 070107: Swift detection of a burst
  17. VLA observation of GRB 061222B
  18. VLA detection of GRB 061222A
  19. GRB070103: APO SPIcam i' and z' limits
  20. GRB070103: KPNO 4m+FLAMINGOS J limit
  21. GRB 070103: Swift/UVOT Upper limits
  22. GRB070103: Swift XRT refined analysis
  23. GRB 070103, Swift-BAT refined analysis
  24. GRB 070103: NOT observations
  25. GRB 070103: TAROT Calern observatory optical observations
  26. GRB 070103: Swift detection of a burst
  27. Retractions of previous Swift-BAT triggers
  28. GRB061222a: optical observations
  29. Konus-Wind observation of GRB 061222A
  30. GRB 061210: Swift/XRT Astrometry Correction
  31. GRB 050826: MDM Redshift
  32. GRB 061222A: MITSuME Akeno optical upper limits
  33. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  34. GRB 061222B: MITSuME Akeno optical upper limits
  35. GRB 061222A: Xinglong Optical Limit
  36. GRB 061222A: Gemini Afterglow Candidate
  37. GRB 061222B, Swift-BAT refined analysis
  38. GRB061222A Swift/UVOT: Upper Limits
  39. GRB 061222B: Swift/UVOT Upper limits
  40. GRB 061222B: Observation with the KANATA 1.5m telescope
  41. GRB061222B: Swift-XRT Refined Analysis
  42. GRB 061222A: Observation with the KANATA 1.5m telescope
  43. GRB 061222B: BOOTES-IR optical observations
  44. GRB 061222B: SARA upper limit
  45. GRB 061222A: Swift-XRT refined analysis
  46. GRB 061222A, Swift-BAT refined analysis
  47. GRB 061222B: REM NIR/optical observations
  48. GRB 061222b, SMARTS optical/IR afterglow observations
  49. GRB 061222B: TAROT La Silla observatory afterglow observation
  50. GRB 061222B: TAROT La Silla observatory optical observations
  51. GRB 061222b: Magellan redshift
  52. GRB 061222B: Swift detection of a burst
  53. GRB 061222b: optical afterglow
  54. GRB 061222A: Prompt ROTSE-III Optical Limits
  55. GRB 061222: Swift detection of a burst
  56. GRB 061217: Astrometry-Corrected XRT Position
  57. GRB 061201: Magellan redshift of nearby galaxy
  58. GRB 061217: Confirmation of host candidate
  59. GRB 061217: Object ib GCN 5948 is a star
  60. GRB 061217: Extended object in the revised XRT error circle
  61. GRB 061217, Candidate host galaxy
  62. GRB 061217 - Swift/XRT position correction
  63. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  64. GRB 061201: Magellan Redshift of nearby Abell cluster
  65. GRB 061218: TAROT La Silla observatory optical observations
  66. GRB 061217: TAROT Calern observatory optical observations
  67. GRB 061218, Swift-BAT refined analysis
  68. GRB061217: VLT NIR observations
  69. Swift triggers (#251863) on a possible burst
  70. GRB 061217, SMARTS optical observations
  71. GRB061217: Swift/UVOT refined analysis.
  72. GRB 061217: optical observations at Calar Alto
  73. GRB061217 - Swift/XRT refined analysis
  74. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  75. GRB 061217, Swift-BAT refined analysis
  76. GRB 061217: ROTSE-III Optical Limits
  77. GRB 061217: Swift detection of a short hard burst
  78. GRB 061210: MDM Follow-up Observation
  79. GRB061210: Swift/UVOT observations
  80. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  81. GRB 061210: Optical sources near XRT positions
  82. GRB 061210: Swift XRT analysis - Possible counterparts
  83. GRB 061210 : Faulkes North Telescope optical limit
  84. GRB 061214(?): ROTSE-III Optical Limits
  85. GRB 061214(?): Swift detection of a possible burst
  86. Swift/BAT trigger #250033 is due to a known source during loss of
  87. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  88. GRB 061213: MASTER-VWF-Kislovodsk observations
  89. GRB 061210: Gemini/GMOS Observations
  90. GRB 061126: Radio Observations
  91. GRB061201, VLT optical decay: correction
  92. GRB 061210: MDM Observation
  93. GRB 061210, Swift-BAT refined analysis of the SHB
  94. GRB 061210: Swift-BAT detection of a short burst
  95. Optical Afterglow observations of GRB 061126
  96. GRB061126: optical observations
  97. GRB 060926: MASTER: discovery of the optical flare
  98. GRB061126: update on the Swift-XRT afterglow light curve
  99. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  100. GRB 061201: UVOT Observations of a Fading Optical Afterglow

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