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"

19663 results found.

  1. GRB 110207A: Swift detection of a burst
  2. GRB 110206A: Swift detection of a probable X-ray afterglow
  3. GRB 110205A: Lightbuckets Optical Observations
  4. GRB 110205A: Swift/UVOT Continuing Observations
  5. Observations GRB 110205A
  6. GRB 110205A: Swift-BAT refined analysis
  7. GRB 110205A: Newcastle Observatory Optical Observations
  8. GRB 110205A: Swift-XRT refined Analysis
  9. GRB 110205A: optical flare confirmation
  10. GRB 110205A: Enhanced Swift-XRT position
  11. GRB 110205A: PAIRITEL NIR Afterglow Detection
  12. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  13. GRB 110205A: Liverpool Telescope Afterglow Confirmation
  14. GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
  15. GRB 110205A: TAROT Calern observatory optical detection
  16. GRB 110205A: Swift detection of a burst with an optical candidate
  17. GRB 110128A: Fermi GBM detection
  18. GRB 110201A: Swift-XRT refined Analysis
  19. Swift/UVOT observations of GRB110201A
  20. GRB 110201A: Swift-BAT refined analysis
  21. GRB 110201A: MASTER optical observations
  22. GRB 110201A: Swift detection of a burst
  23. GRB 110128A, Swift-BAT refined analysis
  24. GRB 110128A: Swift/UVOT observations
  25. GRB 110128A: Swift-XRT refined Analysis
  26. GRB 110128A: Enhanced Swift-XRT position
  27. GRB 110128A: TAROT Calern observatory upper limits
  28. GRB 110128A: Swift detection of a burst
  29. GRB 110106B, radio observations
  30. IPN triangulation of GRB 110120A
  31. GRB 110106A: CrAO optical observations
  32. GRB 110119A: Fermi GBM detection
  33. GRB 110119A: Suzaku WAM observation of the prompt emission
  34. GRB 110112A: optical upper limit
  35. GRB110119: Swift/UVOT Detection
  36. GRB 110119A: Swift-XRT refined Analysis
  37. GRB 110119A: Swift-BAT refined analysis
  38. GRB 110119A: PAIRITEL NIR Afterglow Detection
  39. GRB 110119A: Enhanced Swift-XRT position
  40. GRB 110119A: Swift detection of a burst with an optical detection
  41. GRB 101219B: GROND detection of a SN signature
  42. Swift-BAT trigger 442771 is a noise fluctuation
  43. GRB 101219B: correction
  44. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  45. New feature in Fermi GBM GRB Ground Position Notices
  46. Swift-BAT Trigger 442539 is not a GRB
  47. Swift Trigger 442539 is probably not a GRB
  48. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  49. GRB 110107A: Swift-XRT afterglow confirmation
  50. GRB 110112A: Swift-XRT refined Analysis
  51. GRB 110112A: Swift/UVOT upper limits
  52. GRB 110112A: MASTER optical observations
  53. GRB 110112A: Swift-BAT refined analysis
  54. GRB 110112A: Enhanced Swift-XRT position
  55. GRB 110112A: Swift detection of a possible short burst
  56. GRB 110107A: Swift/UVOT upper limits
  57. GRB 101225a
  58. GRB 110107A: Swift-XRT Afterglow Candidate
  59. GRB 110107A: Swift-BAT refined analysis
  60. GRB 110107A detected in ground analysis of BAT slew data
  61. GRB 110106B: Fermi GBM detection
  62. GRB 110106B: Swift-XRT refined Analysis
  63. GRB 110106B: Swift-BAT refined analysis
  64. GRB 110106B: Enhanced Swift-XRT position
  65. GRB 110106A: Swift/UVOT Upper Limits
  66. GRB 110106A: Swift-XRT refined Analysis
  67. GRB 110106A: Swift-BAT refined analysis
  68. GRB 110106A: Enhanced Swift-XRT position
  69. GRB 110106B: Swift detection of a burst
  70. GRB 110106A: MASTER optical observations
  71. GRB 110106A: Swift detection of a burst
  72. GRB 110102A: Swift-XRT refined Analysis
  73. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  74. Konus-Wind observation of GRB 110102A
  75. GRB110102A: Swift/UVOT observations
  76. GRB 110102A: Fermi GBM observation
  77. GRB 110102A: Swift-BAT refined analysis
  78. GRB 110102A: Enhanced Swift-XRT position
  79. GRB 110102A: Swift detection of a burst with an optical detection
  80. GRB 101225A: MAXI/GSC observations
  81. GRB 101225A Late-time emission observed by Swift-BAT
  82. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  83. GRB 101225A, Swift-BAT refined analysis
  84. GRB 101225A: Swift/UVOT Detection
  85. GRB 101225A: Swift-XRT refined Analysis
  86. GRB 101225A: Enhanced Swift-XRT position
  87. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  88. GRB 101225A (Swift trigger 441015): optical upper limit
  89. Trigger 441015: Swift detection of a possible burst or transient
  90. GRB 101224A: Swift/UVOT Upper Limits
  91. GRB 101224A: Fermi GBM observation
  92. GRB 101224A: Swift-XRT refined Analysis
  93. GRB 101224A, Swift-BAT refined analysis
  94. GRB 101224A - UVOT-enhanced XRT position
  95. GRB 101224A: Swift detection of a short burst
  96. GRB 101219B: Swift/UVOT refined analysis
  97. GRB 101219B: Swift-XRT refined Analysis
  98. GRB 101219B: Enhanced Swift-XRT position
  99. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  100. GRB 101219B: Fermi GBM 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