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"

36339 results found.

  1. GRB 110120A: Fermi GBM detection
  2. GRB 110119A: Suzaku WAM observation of the prompt emission
  3. GRB 110112A: optical upper limit
  4. GRB 110120A: MASTER optical observations
  5. GRB110119: Swift/UVOT Detection
  6. GRB 110119A: Swift-XRT refined Analysis
  7. GRB110119A: MITSuME Okayama optical upper limits
  8. GRB 110119A: Swift-BAT refined analysis
  9. GRB 110119A: PAIRITEL NIR Afterglow Detection
  10. GRB 110119A: Enhanced Swift-XRT position
  11. GRB 110119A: Swift detection of a burst with an optical detection
  12. GRB110106A, mm-radio observations
  13. GRB 101219B: tentative redshift and spectroscopic supernova detection
  14. GRB 101219B: GROND detection of a SN signature
  15. GRB 101219B: correction
  16. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  17. New feature in Fermi GBM GRB Ground Position Notices
  18. Swift-BAT Trigger 442539 is not a GRB
  19. Swift Trigger 442539 is probably not a GRB
  20. Short GRB 110112B : early optical limit by "Pi of the Sky"
  21. GRB101225A - timing analysis
  22. GRB 110112B: Fermi GBM observation
  23. The Christmas burst GRB 101225A - optical spectroscopy with GTC
  24. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  25. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  26. GRB 110107A: Swift-XRT afterglow confirmation
  27. GRB 101225A: HST observations - no host detected
  28. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  29. GRB 110112B: A short GRB detected by INTEGRAL
  30. GRB 110112A: Swift-XRT refined Analysis
  31. GRB 110112A: Swift/UVOT upper limits
  32. GRB 110112A: WHT candidate afterglow/host galaxy
  33. GRB 110112A: MASTER optical observations
  34. GRB 110112A: Swift-BAT refined analysis
  35. GRB 110112A: Enhanced Swift-XRT position
  36. GRB 110106B: MASTER optical observations
  37. GRB110112A: TNT optical afterglow candidate
  38. GRB 110112A: Swift detection of a possible short burst
  39. GRB 110106B: early optical and near-IR observations
  40. GRB 110107A: Swift/UVOT upper limits
  41. GRB 101225a
  42. GRB 101219b. Possible radio afterglow detection.
  43. GRB 110106B: MASTER early optical observations
  44. GRB 110107A: Swift-XRT Afterglow Candidate
  45. GRB 110107A: Swift-BAT refined analysis
  46. GRB 110107A detected in ground analysis of BAT slew data
  47. GRB 101213A: Gemini-N galaxy redshift
  48. GRB 110106B: Fermi GBM detection
  49. Short GRB 110106A: MASTER OT observations
  50. GRB 110106B: Swift-XRT refined Analysis
  51. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  52. GRB 110106A: TNG NIR observations
  53. GRB 110106B Gemini-N galaxy redshift
  54. GRB 110106B: Liverpool Telescope observations
  55. GRB 110106A: ISAS-Kanazawa optical upper limit
  56. GRB 110106A: MITSuME Okayama optical upper limits
  57. GRB 110106B: WHT candidate afterglow
  58. GRB 110106B: Swift-BAT refined analysis
  59. GRB 110106B: Enhanced Swift-XRT position
  60. GRB 110106A: Swift/UVOT Upper Limits
  61. GRB 110106A: TNG redshift of the closeby galaxy
  62. GRB 110106A: Swift-XRT refined Analysis
  63. GRB110106B: Xinglong TNT upper limit
  64. GRB 110106A: Swift-BAT refined analysis
  65. GRB 110106A: Enhanced Swift-XRT position
  66. GRB 110106B: Swift detection of a burst
  67. GRB 110106A: TNG optical observations and candidate counterparts
  68. GRB 110106A: MASTER optical observations
  69. GRB 101225A: Keck redshift
  70. GRB110106A: Xinglong TNT upper limit
  71. GRB 110106A: Swift detection of a burst
  72. GRB 101225A: Host galaxy
  73. GRB 101219A: Gemini-North host redshift
  74. GRB 110102A: Swift-XRT refined Analysis
  75. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  76. Konus-Wind observation of GRB 110102A
  77. GRB110102A: Swift/UVOT observations
  78. GRB110102A: MITSuME Okayama Optical Observation
  79. GRB 110102A: Fermi GBM observation
  80. GRB 110102A: Swift-BAT refined analysis
  81. GRB 110102A: Enhanced Swift-XRT position
  82. GRB 110102A: Swift detection of a burst with an optical detection
  83. GRB 101225A: optical break from NOT observation
  84. GRB 101225A: MMT spectroscopy
  85. GRB 101225A: P60 Observations
  86. GRB 101225A: MAXI/GSC observations
  87. GRB 101225A Late-time emission observed by Swift-BAT
  88. GRB 101225: Optical follow-up of the Christmas burst
  89. GRB 101225A: WHT observations
  90. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  91. GRB 101225A, Swift-BAT refined analysis
  92. GRB 101225A: Swift/UVOT Detection
  93. GRB 101225A: Swift-XRT refined Analysis
  94. GRB 101225A: Enhanced Swift-XRT position
  95. Trigger 441015 / GRB 101225A: Further NOT optical observation
  96. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  97. GRB 101225A (Swift trigger 441015): optical upper limit
  98. Trigger 441015: Swift detection of a possible burst or transient
  99. GRB 101224A: NOT optical observation
  100. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle

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