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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"

8490 results found.

  1. GRB 070731: Swift/UVOT Upper Limit
  2. GRB 070805: UVOT afterglow candidate retraction
  3. GRB070810b: optical candidate
  4. GRB 070810B, Swift-BAT refined analysis
  5. GRB 070810: MASTER optical observation
  6. Swift Alert 070810.8: MASTER optical observation
  7. GRB 070810B: Swift detection of a short burst
  8. GRB 070810: Swift detection of a burst
  9. GRB 070808: Swift detection of a burst
  10. GRB070805 XRT and UVOT afterglow candidate
  11. GRB 070805, Swift-BAT refined analysis
  12. GRB 070805: Swift/UVOT initial analysis
  13. Swift detection of a outburst from SAX J1810.8-2609
  14. GRB 070802: REM optical observations
  15. GRB 070724B: Swift-XRT afterglow confirmation
  16. GRB 070802: VLT redshift
  17. GRB 070802: V-band detection of the candidate afterglow
  18. GRB 070802: LCO I-band candidate
  19. GRB 070802: GROND J band candidate
  20. GRB 070802: Swift detection of a burst
  21. AGILE-ACS position for the SGR 1806-20 July 27 burst
  22. Intense burst from SGR 1806-20 detected on July 27
  23. GRB 070729: Swift detection of a short hard burst
  24. GRB 070724B: Swift/UVOT Upper limits
  25. GRB 070724B: Swift-XRT afterglow likely candidate
  26. GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle
  27. GRB 070724: Swift detection of a burst
  28. GRB 070721B : Faulkes Telescope South observations
  29. GRB070721B: A bright UVOT candidate
  30. GRB 070721B: Swift detection of a burst
  31. GRB 070714B: confirmation of optical afterglow
  32. GRB070714B: Swift-XRT refined analysis
  33. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  34. SN 2007bg - off-axis GRB?
  35. GRB 070707: VLT observations
  36. GRB 070707: A long GRB detected by INTEGRAL
  37. GRB 070707: A long GRB detected by INTEGRAL
  38. GRB 070429B: NIR Observations
  39. GRB 070704: Correction to GCN Circ 6594
  40. GRB 070704: Swift detection of a burst
  41. Swift UVOT Observations of GRB 070628
  42. GRB 070616: Suzaku/WAM observation of the prompt emission
  43. GRB 070612A: Second Epoch WSRT Radio Observations
  44. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  45. GRB 070621: Swift detection of a burst
  46. GRB070616: Optical Observation by MITSuME Akeno
  47. GRB070616: Optical Observation by MITSuME Okayama
  48. GRB 070612A: Possible WSRT Radio Detection
  49. GRB 070616: BTA astrometry and finding chart
  50. GRB 070616: BTA optical observations
  51. GRB 070616: Swift detection of a burst
  52. GRB 070615: A long GRB detected by INTEGRAL
  53. GRB070612A: MITSuME Okayama Observation
  54. GRB 070612A: spectral lag
  55. GRB 070612A: MDM Observations
  56. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  57. GRB 070610: MITSuME OAO optical upper limit
  58. GRB 070610: Swift-XRT refined analysis
  59. GRB 070611: Swift/UVOT Observations
  60. GRB 070611: Swift-XRT refined analysis
  61. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  62. GRB 070610: Swift-UVOT Upper Limits
  63. GRB 070411: TAROT Calern observatory optical observations
  64. GRB 070531: Swift detection of a burst
  65. GRB 070529: Swift detection of a burst with an optical aterglow
  66. GRB070521: Second Epoch Gemini Imaging
  67. GRB 070521: Keck imaging
  68. GRB070521: Gemini Observations
  69. GRB 070521: Subaru observations and possible host detection
  70. GRB 070520A: Subaru Observations
  71. GRB 070520B: Swift-XRT refined analysis
  72. GRB 070521: Swift detection of a burst
  73. GRB 070520B: Swift detection of a burst
  74. GRB 070520: Swift detection of a burst
  75. GRB 070517: Gemini optical imaging
  76. GRB 070518: Swift detection of a burst with optical afterglow
  77. GRB 070510: Swift detection of a possible burst
  78. GRB 070508: OA fading and tentative redshift
  79. GRB 070509, Swift-BAT refined analysis
  80. GRB 070509: Swift detection of a burst
  81. GRB 070508: TAROT La Silla observatory optical observations
  82. GRB 070508: Swift detection of an intense burst with an optical counterpart
  83. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  84. GRB 070506: Swift detection of a burst with optical afterglow
  85. GRB 070309: Swift-XRT afterglow confirmation
  86. GRB 070429B: Swift detection of a short burst
  87. GRB 070429: Swift detection of a burst
  88. LT monitoring of GRB070412
  89. GRB 070420: Swift detection of a burst with optical afterglow
  90. GRB 070419A Swift-BAT Refined Analysis
  91. GRB 070419B: Swift XRT refined analysis
  92. GRB 070419A, Optical observations
  93. GRB 070419B optical afterglow candidate
  94. GRB 070419B: optical afterglow candidate
  95. GRB 070419: P60 Confirmation of Optical Afterglow
  96. GRB 070419B: Swift detection of a burst
  97. GRB 070419 optical afterglow candidate
  98. GRB 070419: Swift detection of a burst
  99. Trigger 276045: Swift detection of a possible burst
  100. GRB 070412: Swift-XRT refined position

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