Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

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"

31633 results found.

  1. GRB 070615
  2. GRB 070612A: Super-LOTIS observations
  3. GRB 070612A: Rapid Decay
  4. GRB 070612A: Suzaku/WAM observation of the prompt emission
  5. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  6. GRB070612A: MITSuME Okayama Observation
  7. GRB 070612A: continued SARA observations
  8. GRB 070612A: spectral lag
  9. GRB 070611: Watcher Observations
  10. GRB 070612A: MDM Observations
  11. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  12. GRB 070612B: SARA upper limit
  13. GRB 070612B, Swift-BAT refined analysis
  14. GRB 070612A, Swift-BAT refined analysis
  15. GRB 070612B: Swift-XRT refined analysis
  16. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  17. GRB 070612B: Swift/UVOT upper limits
  18. GRB070612B: P60 Observations
  19. GRB 070612B: KAIT limits
  20. GRB 070612A: SARA detection of possible OT
  21. GRB 070612B: Swift XRT position from downlink data
  22. GRB 070610: MITSuME OAO optical upper limit
  23. GRB070612 - SDSS Pre-Burst Observations
  24. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  25. GRB 070610: SARA upper limit
  26. GRB 070610: Swift-XRT refined analysis
  27. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  28. GRB 070611: Swift/UVOT Observations
  29. GRB 070611: Swift-XRT refined analysis
  30. GRB 070611, Swift-BAT refined analysis
  31. GRB 070610: Watcher Observations
  32. GRB 070611: VLT redshift
  33. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  34. GRB 070611; Swift-XRT position
  35. GRB 070611: ROTSE-III Optical Limits
  36. GRB 070610: Swift-UVOT Upper Limits
  37. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  38. GRB 070610, Swift-BAT refined analysis
  39. GRB 070610; Swift-XRT position
  40. GRB 070411: TAROT Calern observatory optical observations
  41. GRB 070419A, deep LBT photometry and possible supernova detection
  42. GRB070520B: optical observations
  43. GRB070520: optical observation
  44. GRB070518: optical observation
  45. GRB070521: optical observation
  46. Swift/UVOT refined analysis of GRB070531
  47. GRB 070531: Swift-BAT refined analysis
  48. GRB 070531: Swift-XRT position
  49. GRB 070531: Liverpool Telescope Optical Observations
  50. GRB 070529: SARA upper limit
  51. Swift/UVOT refined analysis of GRB070529
  52. GRB 070529: MARGE Observations
  53. GRB 070529: Optical aterglow from MIRO
  54. GRB 070529: Gemini Redshift
  55. GRB 070529: Swift-XRT refined analysis
  56. GRB 070529, Swift-BAT refined analysis
  57. GRB 070529: Xinglong TNT Optical Upper Limit
  58. GRB 070412: Deep Keck imaging
  59. Swift Triggers 280447, 280450 and 280451 are invalid
  60. GRB 070518, deep LBT photometry
  61. GRB 070518: MARGE Observations
  62. Konus-Wind observation of GRB 070521
  63. GRB 070518: optical observation
  64. GRB070521: Second Epoch Gemini Imaging
  65. GRB070521: NIR observations
  66. GRB070520B: NIR observations
  67. GRB 070521: Swift/UVOT Upper Limits
  68. GRB 070521, optical observation
  69. GRB 070521: Swift-XRT refined analysis
  70. GRB 070521: Keck imaging
  71. GRB070521: Gemini Observations
  72. GROND upper limits of GRB 070521
  73. GRB 070521 Milagro GeV/TeV Observations
  74. GRB 070520B: SARA upper limit
  75. GRB 070520A: SARA upper limit
  76. GRB 070521: SARA upper limit
  77. GRB 070521: Subaru observations and possible host detection
  78. GRB070518: Optical/NIR observation
  79. GRB 070520B: Swift/UVOT Upper Limits
  80. GRB 070520A: Subaru Observations
  81. GRB 070521, Swift-BAT refined analysis
  82. GRB 070520A: Swift UVOT Upper Limits
  83. GRB 070520B: Swift-XRT refined analysis
  84. GRB070521: P200 Observations
  85. GRB070521 : Faulkes Telescope North Observations
  86. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  87. GRB 070520A: MITSuME Akeno optical upper limits
  88. GRB 070520B, Swift-BAT refined analysis
  89. GRB 070520A, Swift-BAT refined analysis
  90. GRB 070520A: Swift-XRT refined analysis
  91. GRB 070518: TNG observations
  92. GRB 070520: Xinglong EST optical Upper Limit
  93. VLA observation of GRB 070518
  94. GRB 070518: Swift-XRT refined analysis
  95. GRB 070517: Gemini optical imaging
  96. GRB070518: UVOT refined analysis
  97. GRB 070518, Swift-BAT refined analysis
  98. GRB 070518: OT confirmed form Xinglong TNT observation
  99. GRB070517: Swift-XRT Refined Analysis
  100. GRB 070517, Swift-BAT refined analysis

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov