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"

37578 results found.

  1. GRB 150818A: TSHAO and SAO RAS optical observations
  2. GRB 150902A: Swift-XRT afterglow detection
  3. GRB 150902A: Swift/UVOT Upper Limits
  4. GRB 150902A: Swift-XRT observations
  5. GRB 150831A: 9.8 GHz VLA upper limits
  6. GRB 150902A: MASTER-SAAO optical observations
  7. Konus-Wind observation of GRB 150902A
  8. GRB 150901A, Swift-BAT refined analysis
  9. GRB 150902A: Swift ToO observations
  10. GRB 150902A: Fermi GBM detection
  11. GRB 150902A: Fermi-LAT detection
  12. GRB 150831B: Swift/UVOT Upper Limits
  13. Konus-Wind observation of GRB 150831A
  14. GRB 150901A: Swift detection of a burst
  15. GRB 150821A: Flattening in the UVOT light curve
  16. GRB 150831B: Swift-BAT refined analysis
  17. GRB 150831B: Swift-XRT refined Analysis
  18. GRB 150831B: MASTER-IAC early optical observations
  19. GRB 150831B: Fermi GBM detection
  20. GRB 150831A: GROND Upper Limits
  21. GRB 150831A: Swift/UVOT Upper Limits
  22. GRB 150831B: Swift-XRT observations
  23. GRB 150831A: Swift-XRT refined Analysis
  24. GRB 150831B: Swift detection of a probable burst
  25. GRB 150831A: Swift-BAT refined analysis
  26. GRB 150818A: Spectroscopic confirmation of the SN from GTC
  27. GRB 150831A: Enhanced Swift-XRT position
  28. GRB 150831A: optical upper limit ISON-SSO
  29. INTEGRAL detection of GRB 150831A
  30. GRB 150831A: Swift detection of a short burst
  31. Fermi GBM trigger 150829183 is not a GRB
  32. Fermi GBM trigger 150828520 is not a GRB
  33. Fermi GBM trigger 150827524 is not a GRB
  34. GRB 150818A: possible SN rise in light curve of Mondy observations
  35. Fermi GBM trigger 150826536 is not a GRB
  36. Konus-Wind observation of GRB 150824A
  37. IPN Triangulation of GRB 150824A
  38. GRB 150824A: Fermi GBM detection
  39. Konus-Wind observation of GRB 150821A
  40. GRB 150821A: LCOGT Siding Springs early observations
  41. Konus-Wind observation of GRB 150818A
  42. GRB 150821A: LCOGT Sutherland observations
  43. GRB 150821A, Swift-BAT refined analysis
  44. GRB 150821A: GROND afterglow observations
  45. GRB 150821A: Swift-XRT refined Analysis
  46. GRB 150819A: Mondy and TSHAO optical upper limits
  47. GRB 150821A: Swift/UVOT Detection
  48. GRB 150821A: Enhanced Swift-XRT position
  49. GRB 150821A: Fermi GBM detection
  50. GRB 150818A: continued Mondy optical observations
  51. GRB 150821A: VLT/X-shooter redshift
  52. GRB 150821A: Swift detection of a burst with an optical afterglow
  53. GRB 120729A: KAIT Optical Observations
  54. KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
  55. GRB 150818A: Mondy optical observations
  56. GRB150819A: NOT imaging
  57. Konus-Wind observation of GRB 150819B
  58. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  59. GRB 150819B: Fermi GBM detection
  60. GRB 150818A: 10.4m GTC spectroscopy and host galaxy
  61. IPN Triangulation of GRB 150819B (short / very intense)
  62. GRB 150818A: Mondy optical observations
  63. GRB 150818A: MITSuME Ishigakijima upper limits
  64. GRB 150819A: RATIR Optical Observations
  65. GRB 150819A: Swift-XRT refined Analysis
  66. GRB 150818A: MITSuME Akeno optical upper limits
  67. GRB 150819A: Swift-BAT refined analysis
  68. GRB 150819A: MASTER-IAC early upper limit
  69. GRB 150819A: Swift/UVOT Upper Limits
  70. GRB 150819A: Enhanced Swift-XRT position
  71. GRB 150818A: Swift-XRT update, correction to GCN 18162
  72. GRB 150819A: Prompt enhanced Swift-XRT position
  73. GRB150818A: NOT imaging
  74. GRB 150819A: Swift detection of a burst
  75. GRB 150818A: Swift-XRT refined Analysis
  76. GRB 150818A: Swift/UVOT Detection
  77. GRB 150817A: AAO optical observations
  78. GRB 150818A: Enhanced Swift-XRT position
  79. GRB 150817A: LCOGT observations
  80. GRB 150818A: Swift-BAT refined analysis
  81. GRB 150817A: Continued RATIR Optical Observations - Afterglow Confirmation
  82. GRB 150818A: Swift/UVOT candidate afterglow
  83. GRB 150818A: Planned XMM-Newton observation
  84. GRB 150817A: P60 Observations
  85. GRB 150818A: Swift detection of a burst
  86. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  87. GRB 150817A: Swift/UVOT Upper Limits
  88. GRB 150817A: Fermi GBM observation
  89. GRB 150817A: Swift-BAT refined analysis
  90. GRB 150817A: Swift-XRT refined Analysis
  91. GRB 150817A: Enhanced Swift-XRT position
  92. GRB 150817A: Continued RATIR Observations, Revised Candidate
  93. GRB 150817A: RATIR Optical Afterglow Candidate
  94. GRB 150817A: Swift detection of a burst
  95. Fermi GBM Trigger 150815694 is not a GRB
  96. GRB 150811A: Continued RATIR Observations
  97. GRB 150811A: Continued RATIR Observations
  98. GBM Trigger 150813665 is not a GRB
  99. Konus-Wind observation of GRB 150811B
  100. Swift Trigger 652046 is probably not a GRB

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