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"

18375 results found.

  1. GRB 090313: Swift-XRT refined analysis
  2. GRB 090313: Swift/UVOT upper limits
  3. GRB 090313, GROND observations
  4. Swift trigger 346250 is probably not a burst
  5. GRB 090205: Zadko Telescope late-time observations
  6. GRB 090309A: GROND upper limits
  7. GRB 090307A: TAROT Calern observatory optical observations
  8. GRB 090309: Swift/UVOT Upper Limits
  9. GRB 090309B: Fermi GBM detection
  10. GRB 090309: Enhanced Swift-XRT position
  11. GRB 090308: GROND observations
  12. GRB 090308: Gemini GMOS Observations
  13. GRB 090309: Swift detection of a burst
  14. GRB 090308: Swift/UVOT Upper Limits
  15. GRB 090307: GROND Upper Limits
  16. GRB 090306B: GROND Upper Limits
  17. GRB 090308: Swift-XRT refined analysis
  18. GRB 090308: Swift detection of a burst
  19. GRB 090306B: Possible XRT afterglow
  20. GRB 090307: Swift-XRT afterglow confirmation and analysis
  21. Swift Trigger 345551 is probably not a GRB
  22. IPN localization of short GRB 090305C
  23. GRB 090306: Swift detection of a possible burst
  24. GRB 090305: Swift/UVOT Upper Limits
  25. GRB 090305: Swift-XRT refined analysis
  26. GRB090305: GMOS-S Candidate Optical Afterglow
  27. GRB 090305: Swift detection of a short burst
  28. GRB 081211B: Nearby cluster
  29. GRB090217: XRT analysis
  30. SGR activity seen by BAT during ICSP Ionospheric Events
  31. VLA radio upper limit on GRB 090205
  32. GRB 090205: Swift/UVOT Upper Limits
  33. GRB 090205: GROND observations and photometric redshift estimate
  34. GRB 090205: VLT candidate afterglow
  35. GRB 090205: Enhanced Swift-XRT position
  36. GRB 090205: Swift detection of a burst
  37. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  38. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  39. GRB090201: Swift UVOT upper limits
  40. GRB 090201: object inside the enhanced XRT error circle
  41. GRB 090201: Enhanced Swift-XRT position
  42. GRB 090201: VLT NIR observations
  43. GRB 090201: VLT afterglow candidate
  44. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  45. GRB 090201: ROTSE-III Optical Limits
  46. GRB 090126A: Swift/UVOT Upper Limits
  47. Suzaku ToO Observation of AXP 1E 1547.0-5408
  48. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  49. GRB 090102: HST observations and host galaxy
  50. GRB 090118: no afterglow candidate
  51. GRB 090123: GROND detection
  52. GRB 090123: Swift/UVOT Observations
  53. GRB090123: Enhanced Swift-XRT position
  54. GRB 090123: Swift detection of a burst
  55. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  56. Trigger 340734: Swift detection of a possible short burst
  57. GRB 090118: Subaru NIR Observation
  58. GRB 090118: KPNO 4m 2nd Epoch Observations
  59. GRB 090118 (BATSS): GRT Optical Observation
  60. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  61. GRB090118 Swift/UVOT upper limits
  62. GRB 090118: GROND Upper Limits
  63. GRB 090118: Possible burst detection from Swift-BAT slew data
  64. GRB 090117: GROND Upper Limits
  65. GRB090117 Swift/UVOT upper limits
  66. GRB090117: Swift-XRT detection of a possible candidate afterglow
  67. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  68. GRB 090113: Swift UVOT upper limits
  69. GRB 090113: GROND Upper Limits
  70. GRB 090113: Observations from NOT
  71. GRB 090113: Enhanced Swift-XRT position
  72. GRB 090113: ROTSE-III Optical Limits
  73. GRB 090112B: Fermi GBM Detection
  74. GRB 090113: Swift detection of a burst
  75. GRB 090111, Swift-BAT refined analysis
  76. GRB 090111: Swift UVOT Upper Limits
  77. GRB 090111: Enhanced Swift-XRT position
  78. GRB 090111: Swift detection of a burst
  79. GRB 090102: WSRT Radio Observations
  80. GRB 090107B: Swift XRT afterglow confirmation
  81. GRB 090107B: Swift/UVOT Observations
  82. GRB 090107B: Swift-XRT detection of possible afterglow
  83. VLA radio upper limit on GRB 090102
  84. GRB 090102: GRT Optical Observation
  85. Swift triggered on the HMXB 1A 1118-61
  86. GRB 090102: P60 Imaging and P200 Spectroscopy
  87. GRB 090102 Observations from IAC80
  88. GRB 090102: GROND observations of the optical afterglow
  89. GRB 090102: NOT redshift
  90. GRB 090102: Enhanced Swift-XRT position
  91. GRB 090102: REM observations of a bright afterglow
  92. GRB 090102: Swift detection of a burst with an optical counterpart
  93. GRB 090102: TAROT Calern observatory optical observations
  94. GRB 081230: GROND confirmation of the afterglow
  95. GRB081230: Swift-XRT refined analysis
  96. GRB 081230 Swift/UVOT Observations
  97. GRB 081230: Enhanced Swift-XRT position
  98. GRB 081230: Swift detection of a burst
  99. GRB 081228, Swift-BAT refined analysis
  100. VLA radio detection of GRB 081221

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