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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

23729 results found.

  1. GRB070125: Optical observation by Kanata
  2. GRB 070126?: Swift detection of a possible burst
  3. RHESSI Spectrum of GRB070125
  4. IPN-BAT localization of GRB070125 (very long duration, intense)
  5. Konus-Wind observation of short hard GRB 070124
  6. IPN localization of GRB070124 (short duration, hard spectrum)
  7. GRB 070110: optical break
  8. GRB 070110: Continued Detection and Request for Ground Followup
  9. GRB 070107: Suzaku WAM observation of the prompt emission
  10. Further Retractions of previous Swift-BAT triggers
  11. Trigger 255685: Swift detection of a possible burst
  12. GRB 070110, Swift-BAT refined analysis
  13. IBAS Alert n. 4047: Not a GRB
  14. GRB 070107, Swift-BAT refined analysis
  15. GRB 070107: Swift detection of a burst
  16. GRB070103: Swift XRT refined analysis
  17. GRB 070103, Swift-BAT refined analysis
  18. Retractions of previous Swift-BAT triggers
  19. erratum : SDSS Pre-burst Observations of GRB061126
  20. GRB 061210: Swift/XRT Astrometry Correction
  21. GRB 061222B: TAROT La Silla observatory early optical observations
  22. GRB 061218: TAROT La Silla observatory early optical observations
  23. GRB 061222A: MITSuME Akeno optical upper limits
  24. GRB 061222B: MITSuME Akeno optical upper limits
  25. GRB 061222B, Swift-BAT refined analysis
  26. GRB 061222B: Observation with the KANATA 1.5m telescope
  27. GRB061222B: Swift-XRT Refined Analysis
  28. GRB 061222A: Observation with the KANATA 1.5m telescope
  29. GRB 061222B: BOOTES-IR optical observations
  30. GRB 061222A, Swift-BAT refined analysis
  31. GRB 061222b, SMARTS optical/IR afterglow observations
  32. GRB 061222A: Prompt ROTSE-III Optical Limits
  33. GRB 061218: TORTOREM optical upper limits
  34. GRB 061218, Swift-BAT refined analysis
  35. GRB 061218, SMARTS optical/IR observations
  36. GRB 061218: REM prompt observations
  37. GRB 061217, SMARTS optical observations
  38. GRB061217 - Swift/XRT refined analysis
  39. GRB 061217, Swift-BAT refined analysis
  40. GRB 061217: REM prompt observations
  41. GRB 061217: ROTSE-III Optical Limits
  42. GRB 061217: Swift detection of a short hard burst
  43. GRB061210: Swift/UVOT observations
  44. GRB 061210 : Faulkes North Telescope optical limit
  45. GRB 061214(?): ROTSE-III Optical Limits
  46. GRB 061210: Suzaku WAM observation of the prompt emission
  47. Swift/BAT trigger #250033 is due to a known source during loss of
  48. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  49. GRB 061213: MASTER-VWF-Kislovodsk observations
  50. GRB 061210: Gemini/GMOS Observations
  51. GRB 061210, Swift-BAT refined analysis of the SHB
  52. Optical Afterglow observations of GRB 061126
  53. GRB 060926: MASTER: discovery of the optical flare
  54. Corrections for Swift/UVOT Exposure Times for GRBs 061110B and 061121
  55. GRB 061201: SOAR Confirmation of Candidate Afterglow
  56. GRB 061202: Swift XRT refined analysis
  57. Konus-Wind observation of GRB 061201
  58. GRB061202: optical/NIR observations with REM
  59. GRB061202: Swift/UVOT Upper Limits
  60. GRB 061202, Swift-BAT refined analysis
  61. GRB 061201: Swift XRT Team refined analysis
  62. GRB 061201, Swift-BAT refined analysis of the SHB
  63. GRB 061121, SMARTS optical/IR observations
  64. GRB061121: optical observations
  65. GRB 061126: optical observation
  66. RHESSI Spectrum of GRB061126
  67. GRB 061126: Swift/UVOT Observations
  68. GRB 061126, Swift-BAT refined analysis
  69. GRB 061126: SARA Observations
  70. GRB 061126: Faulkes Telescope North Optical Observations
  71. GRB 061121: MDM Continued Monitoring
  72. GRB 061121: MDM Continuing Optical Decay
  73. GRB061121: optical observations
  74. GRB 061122: Candidate Optical Afterglow
  75. GRB 061121: MDM Optical Decay
  76. GRB061122: Swift/UVOT Optical Observations
  77. Konus-Wind observation of GRB 061122
  78. GRB 061121: MDM Optical Observations
  79. RHESSI Spectrum of GRB061121
  80. INTEGRAL results on GRB 061122
  81. GRB 061122A: a long GRB detected by INTEGRAL
  82. GRB 061121: Swift/UVOT Observations
  83. GRB 061121, Swift-BAT refined analysis
  84. GRB061121, optical observation
  85. GRB 061121: Optical observation at the KANATA 1.5m telescope
  86. GRB 061121: Faulkes Telescope North Optical Observation
  87. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  88. GRB 050915B: optical afterglow
  89. GRB 060111B: Swift UVOT Refined Magnitudes
  90. Swift/UVOT Upper Limits for GRB061110b
  91. Swift/UVOT Upper Limits for GRB061110a
  92. GRB 061110A - VLT tentative redshift
  93. GRB 061110B, Swift-BAT refined analysis
  94. GRB 061110A: Swift XRT refined analysis
  95. GRB 061110B: Swift/XRT position
  96. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  97. GRB 061110A, Swift-BAT refined analysis
  98. GRB 061110: ROTSE-III Optical Limits
  99. GRB 061109: optical observation
  100. GRB061028: MAGIC telescope GeV observation

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