Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

5161 results found.

  1. GRB 080319B: Swift-XRT Team Refined Analysis
  2. GRB 080319C: Swift detection of a burst with an optical afterglow
  3. GRB080310: Optical observation by MITSuME telescope
  4. GRB080310: Super-LOTIS suggestion of brightening
  5. GRB 080310: Swift detection of a burst with optical afterglow
  6. GRB 080307: Swift-XRT Team refined analysis
  7. GRB 080307: Early RAPTOR Limits
  8. GRB080303: Swift XRT refined analysis
  9. GRB080229: Swift XRT refined analysis
  10. GRB080229: Possible optical afterglow
  11. GRB 080229: Swift detection of a bright burst
  12. GRB 080204: Suzaku WAM observation of the prompt emission
  13. GRB 080218B: Swift-XRT refined analysis
  14. GRB 080212: REM refined analysis
  15. GRB 080212: Gemini-South optical observations
  16. GRB 080212: GROND detects afterglow
  17. GRB 080212: REM NIR afterglow?
  18. GRB 080212: Swift-XRT Team refined analysis
  19. GRB 080212: DSS/2MASS Galaxy at XRT position
  20. GRB 080210: Swift-XRT Refined Analysis
  21. GRB 080207: Swift-XRT Refined Analysis
  22. GRB 080205: MASTER optical observation
  23. IPN localization of very hard GRB 080204
  24. GRB 080130: Swift-BAT refined analysis
  25. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  26. GRB 080129, Swift-BAT refined analysis
  27. GRB 080122 : Suzaku WAM observation of the prompt emission
  28. GRB 080123: Swift-XRT refined analysis
  29. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  30. Swift UVOT Observations of the X-ray transient in NGC 2770
  31. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  32. GRB 071227: Swift-XRT refined analysis
  33. VLA radio detection of GRB 071122
  34. GRB 071122 Swift-XRT refined analysis
  35. GRB 071122: ROTSE-III Optical Limits
  36. GRB 071117: Swift-XRT refined analysis
  37. GRB 071112C: emission lines and refined VLT redshift
  38. GRB 071112C: Swift XRT refined analysis
  39. GRB 071112C: Palomar Pre-Imaging
  40. GRB 071112B: ROTSE-III Rapid Optical Limits
  41. GRB 071104: Swift-XRT Team Refined Analysis
  42. GRB 071101: Swift-XRT Team refined analysis
  43. GRB071101: Optical and NIR upper limits by KANATA
  44. GRB 071101: Swift detection of a burst
  45. GRB 071031: Swift-XRT Team refined analysis
  46. GRB071031: Rapid PROMPT Detections
  47. GRB 071028: Swift-XRT Team refined analysis
  48. GRB 071025: Kuiper Telescope Optical Observations
  49. GRB071020, optical upper limit
  50. GRB 071025: Swift-XRT Team refined analysis
  51. GRB 071025: Swift detection of a burst
  52. GRB 071021: Swift-XRT Team refined analysis
  53. GRB 071021: Swift detection of a burst
  54. GRB 071020: Swift-XRT refined analysis
  55. GRB 071013: 3rd TLS Epoch - constraints on variability
  56. GRB 071010B correction to GCN 6892 optical observations
  57. GRB 071010B: Super-LOTIS upper limit
  58. GRB 071010B optical photometry
  59. GRB 071010: Swift-XRT observation
  60. GRB 071010: Keck Observations of the Afterglow
  61. GRB 071010: TAROT La Silla observatory detection of the afterglow
  62. GRB 071003: Keck HIRES spectroscopy
  63. GRB 071001: Swift-XRT Team refined analysis
  64. Update on Swift Status
  65. GRB 070917: Confirmation of the X-ray afterglow
  66. GRB920925C: search for host galaxy
  67. GRB 070917: P60 Observations
  68. GRB 070917: Swift-XRT observations
  69. GRB 070917: Swift detection of a bright burst
  70. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  71. Konus-Wind observation of GRB 070824
  72. GRB 070824 - Combined SuperAGILE/IPN Localization
  73. GRB 070810A: ROTSE-III Refined Analysis
  74. GRB 070810B: Xinglong TNT optical Upper Limit
  75. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  76. GRB 070810: Swift-XRT Team Refined Analysis
  77. GRB 070809: Swift-XRT refined analysis
  78. GRB 070810: Swift/UVOT Optical Counterpart
  79. GRB 070810: Swift detection of a burst
  80. GRB 070809: ROTSE-III Optical Limits
  81. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  82. GRB 070802: Swift-XRT refined analysis
  83. GRB070729: Swift/UVOT upper limits
  84. GRB 070729: Swift-XRT refined analysis
  85. GRB 070724b: First Gamma Ray Burst Localization by SuperAGILE onboard
  86. GRB 070724: P60 and Gemini Observations
  87. GRB 070724: Swift-XRT Team refined analysis
  88. GRB 070721A: Swift/XRT refined analysis
  89. GRB 070714A: Swift XRT refined analysis
  90. GRB070714B: Swift-XRT refined analysis
  91. GRB 070704: Swift-XRT refined analysis
  92. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  93. GRB070621: RTT150 optical observations
  94. GRB 070621: VLT optical observations
  95. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  96. GRB070621: Swift XRT refined analysis
  97. GRB 070621: Gemini South optical imaging
  98. GRB 070621: UVOT-enhanced XRT position
  99. GRB 070621: NOT observations
  100. GRB 070621: ROTSE-III Prompt Optical Limits

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