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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"

32494 results found.

  1. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  2. GRB 070125 observations with the GMRT
  3. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  4. GRB 060927: PROMPT Observations
  5. GRB 070201: Correction to GCN 6094
  6. GRB 070125: Break in Optical Decay
  7. GRB 070209: Swift XRT analysis
  8. GRB 070201: clarification on localization and Konus-Wind spectra
  9. GRB070208: optical observations
  10. GRB 070201: IPN constraints and nearby galaxies
  11. GRB 070201: Proximity of IPN annulus to M31
  12. GRB 070208: MARGE Optical Observations
  13. GRB 070209, Swift-BAT refined analysis of the short hard burst
  14. GRB 070208: Swift XRT refined analysis
  15. GRB 070208: RAPTOR detection of early afterglow onset
  16. GRB070208: Absorption and emission redshift from Gemini
  17. GRB 070208: MDM Optical Decay
  18. GRB 070208, Swift-BAT refined analysis
  19. GRB070208 - SDSS Pre-Burst Observations
  20. GRB 070208: Early IR detection and afterglow astrometry
  21. GRB 070208: Afterglow confirmation from P60
  22. GRB070208: Faulkes Telescope North Afterglow Identification
  23. GRB 070208: ROTSE-III Optical Limits
  24. GRB 070208: MDM Observations
  25. GRB 070125 detection with CARMA
  26. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  27. GRB 070129: afterglow confirmation
  28. GRB070124: Swift-XRT Follow-up Observation
  29. GRB070126: Swift-XRT Observation
  30. GRB 070125: further AAVSO optical observations
  31. GRB 070129: Swift/UVOT Upper limits
  32. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  33. GRB 070125: optical observation
  34. GRB 070125: WSRT Radio Detection
  35. GRB070129: MITSuME optical observation
  36. Radio detection of GRB 070125
  37. GRB061217: MAGIC telescope GeV observation
  38. GRB 070129, Swift-BAT refined analysis of a particularly long
  39. GRB 070129: Xinglong TNT optical Upper Limit
  40. GRB 070129: Swift-XRT Refined Analysis
  41. GRB 070129: VLT observations
  42. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  43. GRB 070126: Swift/UVOT refined analysis
  44. GRB 070125: further AAVSO optical observations
  45. GRB 070125: MITSuME Okayama optical observation
  46. Konus-Wind observation of GRB 070125
  47. GRB 070125: AAVSO optical observations
  48. GRB 070125: optical observations
  49. GRB 070126: VLT observations
  50. GRB070126: Swift-XRT possible detection of an afterglow
  51. GRB 070125: PROMPT detections
  52. GRB 070124: Suzaku WAM observation of the prompt emissions
  53. GRB 070125: WSRT Radio Observations
  54. GRB 070125: UVOT Detection in Ultraviolet Filters
  55. GRB 070126, Swift-BAT refined analysis of a very faint burst
  56. GRB070125: Optical observation by Kanata
  57. GRB070124: Swift-XRT Observation
  58. Possible GRB 070126: Swift/UVOT Upper Limit
  59. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  60. GRB 070125: Continued P60 Observations
  61. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  62. GRB 070125: Lick 3m Spectroscopy
  63. GRB070125: Swift-XRT Refined Analysis
  64. GRB 070125: SARA detection in R
  65. GRB 070125: P60 Optical Afterglow Candidate
  66. RHESSI Spectrum of GRB070125
  67. Konus-Wind observation of short hard GRB 070124
  68. GRB 070110: optical break
  69. Swift-BAT trigger 257213 is a Galactic Center transient
  70. GRB 070110: Continued Detection and Request for Ground Followup
  71. GRB 070110: Ep,i - Eiso correlation
  72. GRB 070107: Suzaku WAM observation of the prompt emission
  73. GRB 070110: VLT R-band photometry
  74. GRB 070110 declared a "Burst of Interest" by Swift team
  75. Further Retractions of previous Swift-BAT triggers
  76. GRB 070110: VLT absorption redshift
  77. GRB 070110: UVOT Observations of a Candidate Afterglow
  78. GRB070110: Swift XRT Team refined analysis
  79. GRB 070110, Swift-BAT refined analysis
  80. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  81. GRB070107: Swift/XRT refined analysis
  82. GRB 070107: Possible UVOT Afterglow
  83. GRB 070107, Swift-BAT refined analysis
  84. GRB 070107: Swift/XRT position
  85. VLA observation of GRB 061222B
  86. VLA detection of GRB 061222A
  87. GRB070103: APO SPIcam i' and z' limits
  88. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  89. GRB070103: KPNO 4m+FLAMINGOS J limit
  90. GRB 070103: Swift/UVOT Upper limits
  91. GRB070103: Swift XRT refined analysis
  92. GRB 070103, Swift-BAT refined analysis
  93. GRB 070103: NOT observations
  94. Retractions of previous Swift-BAT triggers
  95. GRB061222a: optical observations
  96. Konus-Wind observation of GRB 061222A
  97. GRB 061210: Swift/XRT Astrometry Correction
  98. GRB 050826: MDM Redshift
  99. GRB 061222B: TAROT La Silla observatory early optical observations
  100. GRB 061218: TAROT La Silla observatory early optical observations

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