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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"

3040 results found.

  1. GRB 080320: Gemini-N optical afterglow
  2. GRB 080319B: Gemini-South photometry
  3. GRB 080320 - SDSS Pre-Burst Observations
  4. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  5. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  6. GRB 080319b light curve by Pi-of-the-Sky
  7. GRB 080319b prompt optical observation by Pi-of-the-Sky
  8. Swift Trigger 306616 is not a GRB
  9. GRB080310: Optical observation by MITSuME telescope
  10. GRB080229, optical upper limit
  11. GRB080307: Optical upper limits
  12. GRB 080218B, Swift-BAT refined analysis
  13. GRB 080218B: Swift detection of a burst
  14. GRB 080212, Swift-BAT refined analysis
  15. GRB 080210: Super-LOTIS observations
  16. GRB 080207, Swift-BAT refined analysis
  17. GRB 080207, Swift-BAT refined analysis
  18. GRB 080205: Swift detection of a burst
  19. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  20. GRB 080123 : Suzaku WAM observation of the prompt emission
  21. GRB 080123: Swift detection of a short burst
  22. Swift-BAT refined analysis of short GRB 071227
  23. GRB 071227: Swift detection of a burst
  24. GRB 071122: MASTER optical observation
  25. GRB 071118: Swift detection of a burst
  26. Correction to the Swift-BAT Transient Identification (trigger=296683)
  27. GRB071112C: Errata of MITSuME Ic band photometry
  28. GRB071112C MITSuME Okayama Optical Observation
  29. GRB 071112C: Swift detection of a burst with an optical counterpart
  30. GRB071101: Optical and NIR upper limits by KANATA
  31. GRB071028: Xinglong EST V-band upper limit
  32. GRB071021: MARGE Optical Limits
  33. GRB071020, optical upper limit
  34. GRB071021: MITSuME Okayama Optical Upper Limits
  35. GRB 071018: Swift-XRT observation
  36. GRB 071011, Swift-BAT refined analysis
  37. GRB 071010B, Swift-BAT refined analysis
  38. GRB071008: Swift-XRT observation
  39. GRB 071003, Swift-BAT refined analysis
  40. GRB 071003: Swift detection of a bright burst
  41. Recent SGR1806-20 Activity
  42. GRB 070920B, Swift-BAT refined analysis
  43. GRB 070920: TAROT Calern observatory optical observations
  44. GRB 070911: Swift detection of a burst
  45. GRB070805 XRT and UVOT afterglow candidate
  46. GRB 070805, Swift-BAT refined analysis
  47. GRB 070724B: Swift-XRT afterglow confirmation
  48. GRB 070724B: Swift-XRT afterglow likely candidate
  49. GRB 070724B: Swift-XRT afterglow candidates
  50. Swift XRT observation of GRB 070707
  51. GRB 070704: Swift detection of a burst
  52. GRB 070628: NIR detection of afterglow
  53. OT20050728 was not an optical GRB afterglow
  54. GRB 070621: Gemini South optical imaging
  55. GRB 070616: BTA optical observations
  56. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  57. GRB 070610: Watcher Observations
  58. GRB 070611: ROTSE-III Optical Limits
  59. GRB 070611: Swift detection of a burst
  60. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  61. GRB 070521, Swift-BAT refined analysis
  62. GRB 070521: optical limit by Pi of the Sky
  63. GRB 070518: Swift-XRT refined analysis
  64. GRB 070512: IPN localization and Konus spectrum of a bright burst
  65. GRB 070509: ROTSE-III Optical Limits
  66. GRB 070508, Swift-BAT refined analysis
  67. GRB 070427: Swift detection of a burst
  68. GRB 070420 Swift-BAT Refined Analysis
  69. GRB 070419A: MARGE Observations
  70. GRB 070411: Swift detection of a burst with optical afterglow
  71. GRB 070330, Swift-BAT refined analysis
  72. GRB 070330 - Watcher Observations
  73. Short-Hard GRB 070209: PROMPT Observations
  74. GRB 070318, Swift-BAT refined analysis
  75. GRB 070318: Swift detection of a burst with an optical afterglow
  76. GRB 070306: IR observations and candidate afterglow
  77. GRB 070306: Optical and IR observations with KANATA
  78. VLA observation of GRB 070223
  79. Konus-Wind and Konus-A observations of GRB 070220
  80. GRB 070220: MITSuME Okayama Optical Observation
  81. GRB070208 - SDSS Pre-Burst Observations
  82. GRB 070208: Early IR detection and afterglow astrometry
  83. GRB070208: Faulkes Telescope North Afterglow Identification
  84. GRB 070208: Swift detection of a burst
  85. GRB070129: MITSuME optical observation
  86. GRB 070129: Swift detection of a burst
  87. Swift-BAT trigger 257213 is a Galactic Center transient
  88. Trigger 255685: Swift detection of a possible burst
  89. GRB 070110: Swift detection of a burst with a possible optical afterglow
  90. Retractions of previous Swift-BAT triggers
  91. GRB 061217, Swift-BAT refined analysis
  92. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  93. GRB 060926: MASTER: discovery of the optical flare
  94. GRB 061126: Early Detection of the IR Afterglow
  95. GRB 061121: MDM Optical Decay
  96. GRB 061121: MDM Optical Observations
  97. GRB 061121: Swift detection of a bright burst with an optical counterpart
  98. GRB 061007: Third Epoch ATCA Radio Observations
  99. GRB 061021: Swift-XRT refined analysis
  100. GRB 061021: Swift/UVOT Observation

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