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"

21921 results found.

  1. GRB 140206A: Swift detection of a burst
  2. GRB 140129A: 5 GHz VLA observations
  3. GRB 140129A: Continued RATIR Optical and NIR Observations
  4. GRB 140129A: Khureltogot optical limit
  5. GRB 140129B: Swift/UVOT Detection
  6. GRB 140129A: Continued RATIR Optical and NIR Observations
  7. GRB 140102A: MITSuME Akeno Optical observation
  8. GRB 140129B: MASTER OT early light curve
  9. GRB140129A: RAPTOR Observations of the Early Afterglow
  10. GRB 140129A: MITSuME Okayama upper limits
  11. GRB 140129B: Enhanced Swift-XRT position
  12. GRB 140129A: Swift/UVOT Observations
  13. GRB 140129B: Swift detection of a burst with an optical afterglow
  14. GRB 140129A: Enhanced Swift-XRT position
  15. GRB 140129A: RATIR Optical and NIR Observations
  16. GRB 140129A: Swift detection of a burst with an optical afterglow
  17. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  18. GRB 140114A: optical upper limit
  19. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  20. Konus-Wind observation of GRB 131215A
  21. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  22. GRB 140118A: RATIR Optical and NIR Observations
  23. Swift Trigger 584155 is MAXI J1421-613
  24. GRB 140110A: Further Swift-XRT Observation
  25. GRB 140103A: MASTER-Net early OT detection
  26. GRB 140103A: optical upper limit
  27. GRB 140114A: NOT afterglow observations
  28. GRB 140114A: Continued RATIR Optical and NIR Observations
  29. GRB 140114A: MITSuME Okayama upper limits
  30. GRB 140114A: ROTSE-III Optical Limits
  31. GRB 140114A: Swift/UVOT Upper Limits
  32. GRB 140114A: KAIT Optical Upper Limit
  33. GRB 140103A: AAO optical afterglow candidate
  34. GRB 140104B: Further Swift XRT observations
  35. GRB 140114A: Enhanced Swift-XRT position
  36. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  37. GRB 140102A: AAO optical upper limits
  38. GRB 140114A: Swift detection of a burst
  39. GRB 140108A: Konkoly optical observations
  40. IPN Triangulation of GRB 140110A
  41. GRB 140110A: Swift/UVOT Observations
  42. GRB 140108A: Suzaku WAM observation of the prompt emission
  43. GRB 140104B: Suzaku WAM observation of the prompt emission
  44. GRB 140110A: Swift XRT observations
  45. GRB 140110A: Fermi-LAT detection of a burst
  46. GRB 140108A: Mondy optical upper limit
  47. GRB 140105A: MASTER-Net early optical observations and time correction
  48. GRB 131231A: AAO optical observations
  49. GRB 140108A: Swift/UVOT Detection
  50. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  51. GRB 140108A: Enhanced Swift-XRT position
  52. GRB 140108A: Mondy optical observations
  53. GRB 140108A: D50+BART optical candidate detection
  54. GRB 140108A: 1.23m CAHA observations
  55. GRB 140108A: MASTER-Net OT detection
  56. GRB 140108A: Swift detection of a burst
  57. GRB 140105A: HCT Observations
  58. Swift-BAT triggered on KS 1947+300
  59. GRB 140105A: Swift XRT observations
  60. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  61. GRB 140104B: Swift XRT observations
  62. GRB 140102A: Swift/UVOT Detection
  63. LOAO R-band Observation of GRB 140102A
  64. GRB 140104B: Fermi GBM observation
  65. GRB 131209A: Further Swift XRT observations
  66. GRB 140103A: Lulin Optical r-band Observations
  67. GRB 140102A, Optical Observations
  68. GRB 140103A: P60 Observations
  69. GRB 140102A: P60 observations
  70. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  71. GRB 140103A: Swift/UVOT Upper Limits
  72. Konus-Wind observation of GRB 131231A
  73. GRB 140102A: Fermi/GBM Observation
  74. GRB 131229A: Suzaku WAM observation of the prompt emission
  75. Konus-Wind observation of GRB 140102A
  76. GRB 140102A: GROND observations
  77. GRB 140102A, Swift-BAT refined analysis
  78. GRB 140103A: MASTER-Net optical observations
  79. GRB 140102A: Fermi-LAT detection of a burst
  80. GRB 140102A: Enhanced Swift-XRT position
  81. GRB 140103A: Swift detection of a burst
  82. GRB 140102A: Early optical observations from Nanshan
  83. GRB 131224B detected in ground analysis of Swift-BAT data
  84. GRB 140102A: Swift detection of a burst with optical counterpart
  85. GRB 131231A: P60 observations
  86. GRB 131231A: MDM afterglow observation
  87. GRB 131231A: Nanshan afterglow candidate
  88. GRB 131231A: Fermi-LAT detection of a burst
  89. Konus-Wind observation of GRB 131229A
  90. GRB 131229A: Magellan upper limit
  91. GRB 131229A: GROND observations
  92. GRB 131229A: Swift/UVOT Upper Limits
  93. GRB 131227A: GROND Upper Limits
  94. GRB 131229A: Enhanced Swift-XRT position
  95. GRB 131229A: Deep Gemini-South Imaging
  96. GRB 131229A: Swift detection of a burst
  97. GRB 131224A: 5.8 GHz VLA observations
  98. GRB 131227A: Swift-XRT refined Analysis
  99. GRB 131227A: Xinglong optical observations
  100. GRB 131227A: Swift/UVOT Upper 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