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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"

21263 results found.

  1. GRB 100814A: Submm observations from APEX
  2. Swift/UVOT observations of GRB100814A
  3. GRB 100814A, Swift-BAT refined analysis
  4. GRB 100814A: CQUEAN r- and i-band Observation
  5. GRB 100814A: Enhanced Swift-XRT position
  6. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  7. GRB 100814A: Swift detection of a burst with an optical afterglow
  8. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  9. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  10. GRB 100802A: further NOT observation
  11. GRB 100807A: P200 Infrared Observations
  12. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  13. GRB100807A: optical observation in CrAO
  14. GRB 100805A: optical observation in CrAO
  15. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  16. GRB100807A: MITSuME optical upper limits
  17. GRB 100807A: P60 Optical Afterglow Discovery
  18. GRB 100807A: Swift/UVOT Upper Limits
  19. GRB 100805A: SAO RAS optical observations
  20. GRB 100807A: Enhanced Swift-XRT position
  21. GRB 100807A: ROTSE-III Optical Limits
  22. GRB 100807A: Swift detection of a burst
  23. GRB 100805A: IAC80 and 1.5m OSN optical observations
  24. GRB 100805A: Early RAPTOR Observations
  25. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  26. GRB 100802A: WIYN observations
  27. GRB 100805A: IAC80 BVR-band observations
  28. GRB 100805A: GRAS 002 optical observations
  29. Trigger 430975: Swift detection of a possible burst
  30. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  31. GRB 100805A: Enhanced Swift-XRT position
  32. GRB 100805A: Further P60 Monitoring
  33. GRB 100805A: P60 Optical Afterglow Candidate
  34. GRB 100805A: ROTSE-III Optical Limits
  35. GRB 100805A: Swift detection of a burst with an optical counterpart
  36. GRB 100728B: optical photometry of ISON-NM
  37. GRB 100713A: second epoch Maidanak optical observation
  38. GRB 100713A: CrAO optical limits
  39. GRB 100802A: NOT optical observation
  40. GRB100802A: MITSuME optical upper limits
  41. GRB 100802A: P60 Observations
  42. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  43. GRB 100728A: Suzaku WAM observation of the prompt emission
  44. GRB 100802A: Enhanced Swift-XRT position
  45. GRB 100802A: ROTSE-III Optical Limits
  46. GRB 100802A: Swift detection of a burst
  47. GRB 100728B - NOT optical observation
  48. GRB 100728B: Swift/UVOT Observations
  49. GRB 100728B: Continued KAIT observations
  50. GRB 100728B, Swift-BAT refined analysis
  51. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  52. GRB 100727A: Swift/UVOT Upper Limits
  53. GRB 100728A, Swift-BAT refined analysis
  54. GRB 100728B: Enhanced Swift-XRT position
  55. GRB 100728A: Swift/UVOT Upper Limits
  56. GRB 100728B: GROND Detection of the NIR Afterglow
  57. GRB 100728B: optical detection
  58. GRB 100728B: Swift detection of a burst with an optical counterpart
  59. GRB 100728A: Enhanced Swift-XRT position
  60. GRB 100728A: Swift detection of a burst
  61. GRB 100727A: Enhanced Swift-XRT position
  62. GRB 100727A: Swift detection of a burst
  63. GRB100725B: MITSuME optical upper limits
  64. GRB 100724B: Suzaku WAM observation of the prompt emission
  65. GRB 100725A: GROND upper limits
  66. GRB 100725B: Swift/UVOT Upper Limits
  67. GRB 100725A: Swift/UVOT Upper Limits
  68. GRB 100725B: Enhanced Swift-XRT position
  69. GRB 100725A: Enhanced Swift-XRT position
  70. GRB 100725B: Swift detection of a burst
  71. GRB100725A Faulkes Telescope South observations
  72. Konus-Wind observation of GRB 100724B
  73. GRB 100725A: Swift detection of a burst
  74. GRB 100724B: Fermi GBM detection
  75. GRB 100724A: Enhanced Swift-XRT position
  76. GRB 100724A: Swift/UVOT observations
  77. GRB 100724A: Swift detection of a burst
  78. GRB 100614A: 10.4-m GTC deep-optical limit
  79. GRB 100722A: Fermi GBM detection
  80. GRB 100718A: MASTER-Net optical prompt and alert observations
  81. GRB 100719A: Swift-BAT refined analysis
  82. GRB 100713A: optical observation in Maidanak
  83. GRB 100713A: Swift XRT refined analysis
  84. GRB 100713A: GROND upper limits
  85. GRB 100713A: TNG optical observations
  86. GRB100713A: Swift X-ray afterglow detection
  87. GRB 100707A: Suzaku WAM observation of the prompt emission
  88. Konus-Wind observation of GRB 100707A
  89. GRB 100707A: Fermi LAT detection
  90. GRB 100628A: Chandra observations
  91. GRB 100628A: Swift XRT/UVOT refined analysis
  92. Konus-Wind observation of GRB 100701B
  93. GRB 100704: Swift/UVOT Upper Limits
  94. GRB 100704A: Swift-BAT refined analysis
  95. GRB 100704A: Enhanced Swift-XRT position
  96. GRB 100704A: Swift detection of a burst
  97. GRB 100615A: Additional Gemini/NIRI observations
  98. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  99. Swift/UVOT observations of GRB100702A
  100. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits

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