Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

19354 results found.

  1. GRB 071117: Initial Swift/UVOT observations
  2. GRB 071117: Swift detection of a bright burst
  3. Swift detection of MXB 0656-072
  4. VLA radio upper limit on GRB 071112C
  5. ATCA radio observations of short hard burst GRB 071112B
  6. Correction to the Swift-BAT Transient Identification (trigger=296683)
  7. GRB 071112C: Swift-BAT refined analysis
  8. GRB 071112C: Swift/UVOT observations
  9. GRB 071112C: Swift XRT refined analysis
  10. Swift UVOT upper limits of GRB071112B
  11. GRB 071112B: Swift-XRT preliminary analysis
  12. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  13. Swift-BAT trigger 296491 is not a GRB
  14. GRB 071112C: TAROT Calern observatory optical observations
  15. Swift XRT follow-up observations of GRB071028B
  16. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  17. GRB 071112B: ROTSE-III Rapid Optical Limits
  18. GRB 071112C: Swift detection of a burst with an optical counterpart
  19. GRB 071112B: Swift detection of a short hard burst
  20. GRB 071112: Swift detection of a possible burst
  21. VLA IInd observation of INTEGRAL burst GRB 071109
  22. Swift/UVOT initial analysis of GRB071109
  23. GRB 071109: further Swift-XRT analysis
  24. No radio detection at Swift-XRT position
  25. GRB 071109: Swift-XRT possible X-ray counterpart
  26. GRB 071104: Swift-XRT Team Refined Analysis
  27. GRB 071104: Possible Swift UVOT Afterglow Candidate
  28. GRB 071104: Swift-XRT position
  29. Swift XRT and UVOT observations of GRB071028B
  30. GRB 071101, Swift-BAT refined analysis
  31. GRB 071101: Swift-XRT Team refined analysis
  32. GRB 071101: TAROT Calern observatory optical observations
  33. GRB 071101: Swift XRT position
  34. GRB 071101: BOOTES-2 prompt optical observations
  35. GRB 071101: a nearby galaxy
  36. GRB 071101: Swift detection of a burst
  37. GRB 071031, Swift-BAT refined analysis
  38. GRB 071031: Swift/UVOT detection of afterglow
  39. GRB 071031: Swift-XRT Team refined analysis
  40. GRB 071031: Swift detection of a burst with an optical counterpart
  41. GRB 071028B Swift-BAT detection of a burst
  42. Swift UVOT upper limits to GRB071028
  43. GRB 071028: Swift-XRT Team refined analysis
  44. GRB 071028, Swift-BAT refined analysis
  45. GRB 071028: Swift detection of a burst
  46. GRB 071025: Kuiper Telescope Optical Observations
  47. GRB 071018: Revised BAT position
  48. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  49. GRB071021: MARGE Optical Limits
  50. GRB071020, optical upper limit
  51. GRB 071025 Milagro GeV/TeV Observations
  52. Swift UVOT upper limits
  53. GRB 071025: Swift-XRT Team refined analysis
  54. GRB 071025, Swift-BAT refined analysis
  55. GRB 071025: Early Super-LOTIS Observations
  56. GRB 071025: ROTSE-III Refined Analysis
  57. GRB 071025: Swift XRT refined position
  58. GRB 071025: ROTSE-III Detection of Optical Counterpart
  59. GRB 071025: Swift detection of a burst
  60. GRB 071020: BTA spectroscopy
  61. Possible radio detection of GRB 071021 with the VLA
  62. Radio detection of GRB 071020 with the VLA
  63. GRB 071021: optical and NIR observations
  64. GRB 071021, Swift-BAT refined analysis
  65. GRB 071021: Swift-XRT Team refined analysis
  66. Konus-Wind observation of GRB 071020
  67. GRB 071021: Swift detection of a burst
  68. GRB 071020: Swift-XRT refined analysis
  69. GRB 071020, Swift-BAT refined analysis
  70. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  71. GRB071020 - SDSS Pre-burst Observations
  72. GRB 071020: Swift detection of a bright burst
  73. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  74. GRB 071018: Mercator Telescope optical observations
  75. Swift autonomous slewing re-enabled
  76. GRB 071018: Swift-XRT observation
  77. GRB 071017 - Swift XRT observations
  78. VLA radio observation of GRB 071018
  79. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  80. GRB 071018, Swift-BAT refined analysis
  81. GRB 071018?: Swift detection of a possible burst
  82. GRB 071010B: Suzaku WAM observation of the prompt emission
  83. GRB 071013: 3rd TLS Epoch - constraints on variability
  84. GRB 071013: TLS Upper Limit
  85. VLA detection of radio afterglow of GRB 071010B
  86. VLA non-detection of GRB 071011
  87. GRB 071013: Optical observations
  88. GRB 071013, Swift-BAT refined analysis
  89. GRB 071013: Swift detection of a burst
  90. GRB 071010C Swift-BAT detection of a burst
  91. GRB 071011: Swift-XRT refined analysis
  92. VLA non-detection of GRB 071010A
  93. GRB 071011, Optical afterglow
  94. GRB 071011: MARGE Optical Limits
  95. GRB 071011: XRT afterglow detection
  96. GRB 071011, Swift-BAT refined analysis
  97. GRB 071011: Early Super-LOTIS Observations
  98. GRB 071010B: Bright OT confirmed with TLS
  99. GRB 071011: Swift detection of a burst
  100. Optical Observation: GRB 071010

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