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"

45720 results found.

  1. GRB 110107A: Swift-XRT Afterglow Candidate
  2. GRB 110107A: Swift-BAT refined analysis
  3. GRB 110107A detected in ground analysis of BAT slew data
  4. GRB 101213A: Gemini-N galaxy redshift
  5. GRB 110106B: Fermi GBM detection
  6. Short GRB 110106A: MASTER OT observations
  7. GRB 110106B: Swift-XRT refined Analysis
  8. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  9. GRB 110106A: TNG NIR observations
  10. GRB 110106B Gemini-N galaxy redshift
  11. GRB 110106B: Liverpool Telescope observations
  12. GRB 110106A: ISAS-Kanazawa optical upper limit
  13. GRB 110106A: MITSuME Okayama optical upper limits
  14. GRB 110106B: WHT candidate afterglow
  15. GRB 110106B: Swift-BAT refined analysis
  16. GRB 110106B: Enhanced Swift-XRT position
  17. GRB 110106A: Swift/UVOT Upper Limits
  18. GRB 110106A: TNG redshift of the closeby galaxy
  19. GRB 110106A: Swift-XRT refined Analysis
  20. GRB110106B: Xinglong TNT upper limit
  21. GRB 110106A: Swift-BAT refined analysis
  22. GRB 110106A: Enhanced Swift-XRT position
  23. GRB 110106B: Swift detection of a burst
  24. GRB 110106A: TNG optical observations and candidate counterparts
  25. GRB 110106A: MASTER optical observations
  26. GRB 101225A: Keck redshift
  27. GRB110106A: Xinglong TNT upper limit
  28. GRB 110106A: Swift detection of a burst
  29. GRB 101225A: Host galaxy
  30. GRB 101219A: Gemini-North host redshift
  31. GRB 110102A: Swift-XRT refined Analysis
  32. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  33. Konus-Wind observation of GRB 110102A
  34. GRB110102A: Swift/UVOT observations
  35. GRB110102A: MITSuME Okayama Optical Observation
  36. GRB 110102A: Fermi GBM observation
  37. GRB 110102A: Swift-BAT refined analysis
  38. GRB 110102A: Enhanced Swift-XRT position
  39. GRB 110102A: Swift detection of a burst with an optical detection
  40. GRB 101225A: optical break from NOT observation
  41. GRB 101225A: MMT spectroscopy
  42. GRB 101225A: P60 Observations
  43. GRB 101225A: MAXI/GSC observations
  44. GRB 101225A Late-time emission observed by Swift-BAT
  45. GRB 101225: Optical follow-up of the Christmas burst
  46. GRB 101225A: WHT observations
  47. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  48. GRB 101225A, Swift-BAT refined analysis
  49. GRB 101225A: Swift/UVOT Detection
  50. GRB 101225A: Swift-XRT refined Analysis
  51. GRB 101225A: Enhanced Swift-XRT position
  52. Trigger 441015 / GRB 101225A: Further NOT optical observation
  53. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  54. GRB 101225A (Swift trigger 441015): optical upper limit
  55. Trigger 441015: Swift detection of a possible burst or transient
  56. GRB 101224A: NOT optical observation
  57. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  58. GRB 101224A: Swift/UVOT Upper Limits
  59. GRB 101224A: Fermi GBM observation
  60. GRB 101224A: Swift-XRT refined Analysis
  61. GRB101224A: MITSuME Okayama optical upper limits
  62. GRB 101224A, Swift-BAT refined analysis
  63. GRB 101224A - UVOT-enhanced XRT position
  64. GRB 101224A: Swift detection of a short burst
  65. GRB 101219A: Chandra Observations
  66. GRB 101219B: Swift/UVOT refined analysis
  67. GRB 101219B: Swift-XRT refined Analysis
  68. GRB 101219B: Enhanced Swift-XRT position
  69. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  70. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  71. GRB 101219B: Fermi GBM observation
  72. GRB 101219A: IAC80 optical observations
  73. GRB 101219B: Swift-BAT refined analysis
  74. GRB 101219A: Swift-XRT refined Analysis
  75. GRB 101219B: Swift detection of a burst with an optical afterglow
  76. GRB 101219A: Swift/UVOT Upper Limits
  77. GRB 101219A: GROND Upper limits
  78. Konus-Wind observation of short hard GRB 101219A
  79. GRB 101219A: Magellan NIR observations
  80. GRB 101219A: Further Gemini-South Imaging
  81. GRB 101219A: Swift-BAT refined analysis
  82. GRB 101219A - NOT observation - upper limit
  83. GRB 101219A: SARA-N Upper Limit
  84. GRB 101219A: Gemini-South observations
  85. GRB 101219A: REM optical and NIR observations
  86. GRB 101219A: ROTSE-III Optical Limits
  87. GRB 101219A: Swift detection of a short hard burst
  88. Request for Supernova related data for GRB 101023A
  89. GRB 101213A : Suzaku WAM observation of the prompt emission
  90. Redshift solution(s) for GRB101213A from Swift-XRT data
  91. Konus-Wind observation of GRB 101213A
  92. XRF 101117A, RIMOTS optical upper limits
  93. GRB 101213A: Fermi GBM observation
  94. GRB 101213A, Swift-BAT refined analysis
  95. GRB 101213A: Swift-XRT refined Analysis
  96. GRB 101213A: Swift/UVOT Upper Limits
  97. GRB 101213A: Enhanced Swift-XRT position
  98. GRB 101213: object within the X-ray error circle
  99. GRB 101213A: Swift detection of a burst
  100. GRB101204A: Swift/UVOT observations

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