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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"

32723 results found.

  1. GRB 070107: Suzaku WAM observation of the prompt emission
  2. GRB 070110: VLT R-band photometry
  3. GRB 070110 declared a "Burst of Interest" by Swift team
  4. Further Retractions of previous Swift-BAT triggers
  5. GRB 070110: VLT absorption redshift
  6. GRB 070110: UVOT Observations of a Candidate Afterglow
  7. GRB070110: Swift XRT Team refined analysis
  8. GRB 070110, Swift-BAT refined analysis
  9. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  10. GRB070107: Swift/XRT refined analysis
  11. GRB 070107: Possible UVOT Afterglow
  12. GRB 070107, Swift-BAT refined analysis
  13. GRB 070107: Swift/XRT position
  14. VLA observation of GRB 061222B
  15. VLA detection of GRB 061222A
  16. GRB070103: APO SPIcam i' and z' limits
  17. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  18. GRB070103: KPNO 4m+FLAMINGOS J limit
  19. GRB 070103: Swift/UVOT Upper limits
  20. GRB070103: Swift XRT refined analysis
  21. GRB 070103, Swift-BAT refined analysis
  22. GRB 070103: NOT observations
  23. Retractions of previous Swift-BAT triggers
  24. GRB061222a: optical observations
  25. Konus-Wind observation of GRB 061222A
  26. GRB 061210: Swift/XRT Astrometry Correction
  27. GRB 050826: MDM Redshift
  28. GRB 061222B: TAROT La Silla observatory early optical observations
  29. GRB 061218: TAROT La Silla observatory early optical observations
  30. GRB 061222A: MITSuME Akeno optical upper limits
  31. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  32. GRB 061222B: MITSuME Akeno optical upper limits
  33. GRB 061222A: Gemini Afterglow Candidate
  34. GRB 061222B, Swift-BAT refined analysis
  35. GRB061222A Swift/UVOT: Upper Limits
  36. GRB 061222B: Swift/UVOT Upper limits
  37. GRB 061222B: Observation with the KANATA 1.5m telescope
  38. GRB061222B: Swift-XRT Refined Analysis
  39. GRB 061222A: Observation with the KANATA 1.5m telescope
  40. GRB 061222B: BOOTES-IR optical observations
  41. GRB 061222B: SARA upper limit
  42. GRB 061222A: Swift-XRT refined analysis
  43. GRB 061217: Magellan host galaxy redshift
  44. GRB 061222A, Swift-BAT refined analysis
  45. GRB 061222B: REM NIR/optical observations
  46. GRB 061222b, SMARTS optical/IR afterglow observations
  47. GRB 061222B: TAROT La Silla observatory afterglow observation
  48. GRB 061222b: Magellan redshift
  49. GRB 061222B: Swift detection of a burst
  50. GRB 061222A: Prompt ROTSE-III Optical Limits
  51. GRB 061201: Magellan redshift of nearby galaxy
  52. GRB 061217: Confirmation of host candidate
  53. GRB 061217: Object ib GCN 5948 is a star
  54. GRB 061217: Extended object in the revised XRT error circle
  55. GRB 061217, Candidate host galaxy
  56. GRB 061217 - Swift/XRT position correction
  57. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  58. GRB 061201: Correction to GCN 5944
  59. GRB 061201: Magellan Redshift of nearby Abell cluster
  60. GRB 061218: TAROT La Silla observatory optical observations
  61. GRB 061217: TAROT Calern observatory optical observations
  62. GRB 061218: TORTOREM optical upper limits
  63. GRB 061218, Swift-BAT refined analysis
  64. GRB061217: VLT NIR observations
  65. GRB 061218, SMARTS optical/IR observations
  66. GRB 061218: REM prompt observations
  67. GRB 061217, SMARTS optical observations
  68. GRB061217: Swift/UVOT refined analysis.
  69. GRB 061217: optical observations at Calar Alto
  70. GRB061217 - Swift/XRT refined analysis
  71. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  72. GRB 061217, Swift-BAT refined analysis
  73. GRB 061217: Magellan Observations
  74. GRB 061217: REM prompt observations
  75. GRB 061217: ROTSE-III Optical Limits
  76. GRB 061210: MDM Follow-up Observation
  77. GRB061210: Swift/UVOT observations
  78. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  79. GRB 061210: Optical sources near XRT positions
  80. GRB 061210: Swift XRT analysis - Possible counterparts
  81. GRB 061210 : Faulkes North Telescope optical limit
  82. GRB 061214(?): ROTSE-III Optical Limits
  83. GRB 061210: Suzaku WAM observation of the prompt emission
  84. Swift/BAT trigger #250033 is due to a known source during loss of
  85. GRB 061213: MASTER-VWF-Kislovodsk OT candidate retraction
  86. GRB 061210: Gemini/GMOS Observations
  87. GRB 061126: Radio Observations
  88. GRB061210: Radio Observations
  89. GRB061201, VLT optical decay: correction
  90. GRB 061126: a GRB detected off-axis by INTEGRAL
  91. GRB 061202: Suzaku WAM observation of the prompt emission
  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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