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"

28098 results found.

  1. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  2. GRB 110205A: TAROT Calern observatory detection of an optical flare
  3. GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
  4. GRB 110205A: TAROT Calern observatory optical detection
  5. GRB 110205A: Swift detection of a burst with an optical candidate
  6. GRB 110128A: Fermi GBM detection
  7. GRB 110201A: Swift-XRT refined Analysis
  8. GRB110201A: MITSuME Okayama optical upper limits
  9. Swift/UVOT observations of GRB110201A
  10. GRB 110201A: Swift-BAT refined analysis
  11. GRB 110201A: Swift detection of a burst
  12. GRB110112B: EVLA Observations
  13. GRB110112A: EVLA Observations
  14. GRB110128A: MITSuME Okayama optical upper limits
  15. GRB 110125A: Fermi GBM detection
  16. GRB 101112A: Maidanak and CrAO optical observations
  17. GRB110128A: TNG NIR observations
  18. GRB 110128A, Swift-BAT refined analysis
  19. GRB 110128A: Swift/UVOT observations
  20. GRB 110128A: Swift-XRT refined Analysis
  21. GRB 110120A: Suzaku WAM observation of the prompt emission
  22. GRB 110128A: WHT redshifts of nearby field galaxies
  23. GRB 110128A: Enhanced Swift-XRT position
  24. GRB 110128A: Afterglow detection from NOT
  25. GRB 110128A: TAROT Calern observatory upper limits
  26. GRB 110128A: Swift detection of a burst
  27. IBAS Alerts n. 6130 and 6131 are not due to a GRB
  28. GRB 110123A: Fermi GBM detection
  29. GRB 110106B, radio observations
  30. GRB 110120A: MASTER optical observations
  31. GRB 101224A, the review of the sky area in plate archives
  32. IPN triangulation of GRB 110120A
  33. GRB 101225A: CQUEAN optical observation
  34. GRB 110106A: CrAO optical observations
  35. GRB 110119A: Fermi GBM detection
  36. GRB 110120A: Fermi GBM detection
  37. GRB 110119A: Suzaku WAM observation of the prompt emission
  38. GRB 110112A: optical upper limit
  39. GRB110119: Swift/UVOT Detection
  40. GRB 110119A: Swift-XRT refined Analysis
  41. GRB110119A: MITSuME Okayama optical upper limits
  42. GRB 110119A: Swift-BAT refined analysis
  43. GRB 110119A: PAIRITEL NIR Afterglow Detection
  44. GRB 110119A: Enhanced Swift-XRT position
  45. GRB 110119A: Swift detection of a burst with an optical detection
  46. GRB110106A, mm-radio observations
  47. GRB 101219B: GROND detection of a SN signature
  48. Swift-BAT trigger 442771 is a noise fluctuation
  49. New feature in Fermi GBM GRB Ground Position Notices
  50. Swift-BAT Trigger 442539 is not a GRB
  51. Swift Trigger 442539 is probably not a GRB
  52. Short GRB 110112B : early optical limit by "Pi of the Sky"
  53. GRB101225A - timing analysis
  54. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  55. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  56. GRB 110107A: Swift-XRT afterglow confirmation
  57. GRB 101225A: HST observations - no host detected
  58. GRB 110112A: Swift-XRT refined Analysis
  59. GRB 110112A: Swift/UVOT upper limits
  60. GRB 110112A: WHT candidate afterglow/host galaxy
  61. GRB 110112A: Swift-BAT refined analysis
  62. GRB 110112A: Enhanced Swift-XRT position
  63. GRB110112A: TNT optical afterglow candidate
  64. GRB 110112A: Swift detection of a possible short burst
  65. GRB 110107A: Swift/UVOT upper limits
  66. GRB 101219b. Possible radio afterglow detection.
  67. GRB 110107A: Swift-XRT Afterglow Candidate
  68. GRB 110106B: Fermi GBM detection
  69. GRB 110106B: Swift-XRT refined Analysis
  70. GRB 110106A: TNG NIR observations
  71. GRB 110106A: ISAS-Kanazawa optical upper limit
  72. GRB 110106A: MITSuME Okayama optical upper limits
  73. GRB 110106B: Swift-BAT refined analysis
  74. GRB 110106B: Enhanced Swift-XRT position
  75. GRB 110106A: Swift/UVOT Upper Limits
  76. GRB 110106A: TNG redshift of the closeby galaxy
  77. GRB 110106A: Swift-XRT refined Analysis
  78. GRB 110106A: Swift-BAT refined analysis
  79. GRB 110106A: Enhanced Swift-XRT position
  80. GRB 110106B: Swift detection of a burst
  81. GRB 110106A: TNG optical observations and candidate counterparts
  82. GRB 110106A: Swift detection of a burst
  83. GRB 101225A: Host galaxy
  84. GRB 110102A: Swift-XRT refined Analysis
  85. GRB110102A: Swift/UVOT observations
  86. GRB110102A: MITSuME Okayama Optical Observation
  87. GRB 110102A: Fermi GBM observation
  88. GRB 110102A: Swift-BAT refined analysis
  89. GRB 110102A: Enhanced Swift-XRT position
  90. GRB 110102A: Swift detection of a burst with an optical detection
  91. GRB 101225A: optical break from NOT observation
  92. GRB 101225A: P60 Observations
  93. GRB 101225A: MAXI/GSC observations
  94. GRB 101225A Late-time emission observed by Swift-BAT
  95. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  96. GRB 101225A, Swift-BAT refined analysis
  97. GRB 101225A: Swift/UVOT Detection
  98. GRB 101225A: Swift-XRT refined Analysis
  99. GRB 101225A: Enhanced Swift-XRT position
  100. Trigger 441015 / GRB 101225A: Further NOT optical observation

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