Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

15985 results found.

  1. GRB071010b: optical observation
  2. GRB071021: MITSuME Okayama Optical Upper Limits
  3. GRB 071010B: Fading quickly
  4. GRB 071021: optical and NIR observations
  5. GRB 071021: possible high-z burst
  6. GRB071018: 2nd epoch obsevations of Xinglong TNT
  7. GRB 071021: retraction of Faulkes Telescope South candidate
  8. GRB 071021: Swift-XRT Team refined analysis
  9. GRB 071021: Xinglong TNT optical Upper Limit
  10. GRB 071021 : Lulin R-band limit
  11. GRB 071021: Faulkes Telescope South optical candidate
  12. GRB 071010B: Independent Confirmation of Break
  13. GRB071020A: Xinglong TNT Optical afterglow observations
  14. GRB 071020A: IR Imaging with PAIRITEL
  15. GRB 071020: VLT spectroscopy
  16. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  17. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  18. GRB 071018: Mercator Telescope optical observations
  19. GRB071010b: optical observations
  20. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  21. GRB 071013: TNT optical data refined analysis
  22. GRB071013: optical observations
  23. GRB 071010B: Optical observations of EST
  24. GRB 071011: MITSuME Optical Observations
  25. GRB 070920A: deep optical observations at the NOT
  26. GRB 071010B: Keck/LRIS Photometry
  27. GRB 071013: Optical observations
  28. GRB 071013: optical observations at NOT
  29. GRB071013: optical limit
  30. GRB 20071013: Xinglong TNT optical Upper Limit
  31. GRB 071011: Optical Limit after 13.95hrs
  32. GRB 071011: Xinglong TNT Optical afterglow observations
  33. GRB 071010B correction to GCN 6892 optical observations
  34. GRB 071011: Swift-XRT refined analysis
  35. VLA non-detection of GRB 071010A
  36. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  37. GRB 071011, Optical afterglow
  38. GRB 071011: Confirmation of P60 optical afterglow
  39. GRB 071010B: Optical Detection
  40. GRB 071011: Kanazawa Optical limits
  41. GRB 071011: P60 Optical Afterglow Candidate
  42. GRB 071011: MARGE Optical Limits
  43. GRB 071010B optical photometry
  44. GRB 071011: XRT afterglow detection
  45. GRB 071010B: Gemini Spectroscopic Observations
  46. GRB 071011: NAYUTA Optical Observation
  47. GRB 071010A: Continued Keck Imaging
  48. GRB 071011: Optical afterglow candidate
  49. Optical Observation: GRB 071010
  50. Optical observations: GRB 071010A
  51. GRB071010B: Swift/XRT detection
  52. GRB 071010A: bright NIR afterglow
  53. GRB071008: optical observations
  54. GRB 071010B possible optical transient
  55. GRB 071010: Swift-XRT observation
  56. GRB 071010 REM NIR observations
  57. GRB 071003: XRT refined analysis
  58. Radio detection of GRB 071003 with the VLA
  59. GRB 071003: VLT spectroscopy
  60. GRB 071003: Keck spectroscopy
  61. GRB 071003: Possible rebrightening
  62. GRB 071003 : Lulin R-band observations
  63. GRB 071003: Swift XRT position
  64. GRB 071003: OA power-law decay indices from KAIT
  65. GRB 071003 Optical observations
  66. GRB 071003: P60 Confirmation of Optical Afterglow
  67. GRB 071003: KAIT optical afterglow observations
  68. GRB 070911, SMARTS optical/IR afterglow observations
  69. GRB 070920B: ROTSE-III Early Optical Limits
  70. GRB 070920B: TAROT La Silla observatory optical observations
  71. GRB 070920b, SMARTS optical observation
  72. GRB 070917: Confirmation of the X-ray afterglow
  73. GRB 070920b: LCO optical observations
  74. GRB 070920B: NOT optical observations
  75. GRB 070920: TAROT Calern observatory optical observations
  76. GRB070917: Confirmation of optical afterglow
  77. GRB920925C: search for host galaxy
  78. GRB070917: optical observations
  79. GRB 070917: P60 Observations
  80. GRB 070917: KAIT optical limits
  81. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  82. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  83. GRB 070913: SMARTS optical/IR observations
  84. GRB 070913: TAROT La Silla observatory optical observations
  85. GRB 070809: Confirmation of optical transient
  86. Observations of possible TAROT GRB transient near IC 4779
  87. Candidate Orphan GRB Optical Transient in IC 4779
  88. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  89. GRB070810b: optical candidate
  90. GRB 070810A: ROTSE-III Refined Analysis
  91. GRB 070810A: Continued Keck Imaging
  92. GRB 070810B: Keck spectroscopy of possible host galaxies
  93. GRB 070810: MASTER optical observation
  94. GRB 070809: Swift/UVOT Corrected Photometry
  95. Swift Alert 070810.8: MASTER optical observation
  96. GRB 070810A: Swift-BAT refined analysis
  97. GRB 070810B: Xinglong TNT optical Upper Limit
  98. GRB070810B: Optical observations with KANATA
  99. GRB 070810: Swift/UVOT Optical Counterpart
  100. GRB 070810: ROTSE-III Detection of Optical Counterpart

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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