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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"

3037 results found.

  1. GRB 080328: Swift detection of a burst with an optical counterpart
  2. GRB 080320: Early Super-LOTIS Observations
  3. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  4. GRB 080319b light curve by Pi-of-the-Sky
  5. GRB 080319b prompt optical observation by Pi-of-the-Sky
  6. GRB080310: Optical observation by MITSuME telescope
  7. GRB080307: Optical upper limits
  8. GRB 080218B: Swift detection of a burst
  9. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  10. GRB 080205: Swift/UVOT observations
  11. GRB 080205: Enhanced Swift-XRT position
  12. GRB 080205: KAIT OA detection
  13. GRB 080205: Swift detection of a burst
  14. GRB 080129: GROND detection in all bands, and fading
  15. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  16. IPN triangulation of GRB080122
  17. GRB 080121: Nearby SDSS galaxies
  18. GRB 080120: Swift-XRT refined analysis
  19. GRB080120: Swift XRT position
  20. GRB 071227: Swift detection of a burst
  21. GRB071020: optical observations
  22. GRB 071122 Swift-XRT refined analysis
  23. GRB 071122: Corrected P60 Coordinates
  24. GRB 071122: P60 Optical Afterglow Candidate
  25. GRB 071122: Swift detection of a burst
  26. GRB 071118, Swift-BAT refined analysis
  27. VLT FORS2 observations of short hard GRB071112B
  28. ATCA radio observations of short hard burst GRB 071112B
  29. GRB 071112C: SARA upper limit
  30. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  31. GRB 071028B Swift-BAT detection of a burst
  32. GRB 071025: Kuiper Telescope Optical Observations
  33. GRB 071025, Swift-BAT refined analysis
  34. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  35. GRB 071013: TNT optical data refined analysis
  36. GRB 071010B: Photometry after 1.6 days
  37. GRB 071010A: Continued Keck Imaging
  38. GRB 071006, Swift-BAT refined analysis
  39. GRB 071010B: Swift detection of a burst
  40. Recent SGR1806-20 Activity
  41. GRB 070917: Swift detection of a bright burst
  42. GRB 070808, Swift-BAT refined analysis
  43. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  44. GRB 070729, Swift-BAT refined analysis
  45. GRB 070724B: Swift-XRT afterglow likely candidate
  46. GRB 070721A : Faulkes Telescope South optical limit
  47. GRB 070721A, Swift-BAT refined analysis
  48. GRB 070621: Watcher Observations
  49. GRB070520B: optical observations
  50. GRB 070521, optical observation
  51. GRB 070521, Swift-BAT refined analysis
  52. GRB 070521: optical limit by Pi of the Sky
  53. GRB 070419A: RAPTOR Detection of Early Emission
  54. GRB070330: Correction to UVOT position
  55. UVOT observations of GRB070330
  56. GRB 070330, Swift-BAT refined analysis
  57. GRB 070330: Swift-XRT refined analysis
  58. GRB 070330: Swift detection of a burst
  59. GRB 070311: MDM Optical Detection
  60. GRB070227: Swift-XRT refined analysis
  61. VLA observation of GRB 070224
  62. GRB 070227: optical observations
  63. GRB 070227: optical observations
  64. GRB 070209: Swift XRT analysis
  65. GRB 070103: Swift detection of a burst
  66. Retractions of previous Swift-BAT triggers
  67. GRB 061201: Magellan Redshift of nearby Abell cluster
  68. GRB061202 optical limit by "Pi of the Sky"
  69. RHESSI Spectrum of GRB061126
  70. GRB 061126: SARA Observations
  71. GRB 061126: Swift detection of a burst
  72. GRB061122: Swift/UVOT Optical Observations
  73. GRB 061110: Swift detection of a burst
  74. GRB061019: second epoch CrAO observations
  75. GRB 061028: MDM Observations
  76. GRB 061028, Swift-BAT refined analysis
  77. GRB061019: optical observations
  78. GRB 061007: Second Epoch ATCA Radio Observations
  79. GRB 061007: ATCA Radio Observations
  80. GRB060912: Swift/UVOT Observations
  81. GRB060904b optical detections (delayed report due to internet outage)
  82. GRB 060904B: RTT150 optical observations
  83. Two bright bursts from SGR 1806-20 detected with IBAS
  84. GRB 060825: VLA observations
  85. GRB 060825: XRT Team Refined Analysis
  86. GRB 060825: Swift-BAT Refined Analysis
  87. GRB060825: BOOTES-IR optical observations
  88. Konus-Wind observation of GRB 060813
  89. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  90. GRB 060805: Swift detection of a burst
  91. GRB 060801, optical observation
  92. GRB 060605: SkyNet Optical Limits
  93. GRB 060712: Swift detection of a burst
  94. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  95. GRB 060607: REM NIR afterglow
  96. GRB 060522: Swift detection of a burst with possible optical afterglow
  97. GRB 060516: Swift detection of a burst
  98. GRB060501: P60 imaging and afterglow candidate
  99. GRB060428B, optical observation
  100. GRB060424: optical afterglow detection

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