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"

21957 results found.

  1. GRB 060605, optical observations
  2. GRB060614: SSO 1m observations
  3. GRB060614: Watcher observation
  4. GRB 060614: Swift/UVOT Observations
  5. GRB 060604, optical observations
  6. GRB 060610: KAIT observations
  7. GRB 060607: RTT150 optical observations
  8. GRB 060607: IR observations
  9. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  10. VLT/UVES observations of GRB 060607
  11. GRB 060607: PROMPT Observations
  12. GRB 060605: RTT150 optical observations
  13. GRB 060607: REM NIR afterglow
  14. GRB 060605: Xinglong TNT optical observations
  15. GRB060602B : REM infrared observations
  16. GRB060605: Swift/UVOT detections
  17. GRB 060605: TNG optical observations
  18. GRB 060605: RTT150 optical observations
  19. GRB060605: Spectral Observations and Redshift
  20. GRB 060605: ROTSE-III Optical Counterpart
  21. GRB 060605: ROTSE-III Detection of Optical Counterpart
  22. GRB 060604: redshift
  23. GRB 060512: Keck Redshift
  24. GRB 060602B: Swift-BAT Refined Analysis
  25. GRB 060602B: Swift/UVOT observations
  26. GRB 060602B: RTT150 optical observations
  27. GRB 060211A : WIDGET simultaneous optical observations
  28. GRB060602A: optical observations(/transient?)
  29. GRB 060526: Tautenburg Second Epoch Observations
  30. GRB060602A: Bootes-IR observations
  31. GRB060602B: Watcher observations - no OT candidate
  32. GRB060602B: BOOTES-IR candidate afterglow
  33. GRB060602 - SDSS Pre-Burst Observations
  34. GRB 060502A: Optical afterglow observations
  35. GRB 060526: RTT150 optical observations
  36. GRB060526, optical observations
  37. GRB 051227 : WIDGET simultaneous optical observations
  38. GRB 060526: RTT150 optical observations
  39. GRB 060526: RTT150 optical observations
  40. GRB060502b: optical observations
  41. GRB 060526: RTT150 optical observations
  42. GRB060526: optical observations
  43. GRB 060526: SMARTS optical/IR afterglow observations
  44. GRB 060526: REM observations
  45. GRB 060526: RTT150 optical observations, afterglow flattening
  46. GRB 060526: Optical Flare
  47. GRB 060526: MDM-2.4m Observations
  48. GRB 060526: RTT150 optical observations
  49. GRB060526: Further Swift-UVOT Observations
  50. GRB060526, optical observations
  51. GRB 060526: TNG optical observations
  52. GRB 060526: ROTSE-III Observations of Optical Counterpart
  53. GRB 060526: Watcher Observations
  54. GRB060526 - SDSS Pre-burst Observations
  55. GRB 060526: Continued emission for the Swift burst
  56. GRB060505: VLT observations of the optical afterglow
  57. GRB 060413 : WIDGET simultaneous optical observations
  58. GRB 060522: Swift/UVOT Observations: Correction
  59. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  60. GRB060512: Late-Time P200 Observations
  61. GRB 060522: REM NIR observations
  62. GRB 060522: TNG optical observations
  63. GRB060515: P200 NIR Observations
  64. GRB 060512: TAROT optical observation
  65. GRB 060515: Super-LOTIS Observations
  66. Swift/UVOT observations of GRB060512.
  67. GRB 060512: Subaru NIR observation
  68. GRB 060512: 1.54m Kuiper Observations
  69. GRB 060512: Detection of NIR afterglow
  70. GRB 060512: P60 Observations
  71. GRB 060505 - OT candidate + galaxy spectrum
  72. GRB 060512: optical decay
  73. GRB 060512: REM NIR observations
  74. GRB060512 - SDSS Pre-Burst Observations
  75. GRB060512 Name Correction: LT Afterglow detection
  76. GRB060512: Liverpool Telescope Afterglow detection
  77. GRB060418: optical observations
  78. GRB 060428a, SMARTS optical/IR afterglow detection
  79. GRB060510 - SDSS Pre-Burst Observations
  80. GRB 060510b: Redshift
  81. GRB 060510b: Gemini NIR observations
  82. GRB 060510B: Super-LOTIS Observations
  83. GRB 060510b: NIR observations
  84. GRB 060510B: MDM Observations and candidate OT
  85. GRB 060510B: Swift detection of a burst
  86. GRB060502B: improvement in the XRT afterglow position
  87. GRB 060505: PROMPT Observations
  88. GRB 060507: MDM Optical Upper Limit
  89. GRB060507: Swift XRT position
  90. GRB060505: Swift/UVOT Observations
  91. GRB 060505: Swift XRT Team Refined Analysis
  92. GRB060425: new MASTER survey method
  93. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  94. GRB 060505: Swift XRT afterglow canditate position
  95. GRB 060502b: Second epoch Gemini observations
  96. GRB 060428B: spectroscopy
  97. GRB 060502B: optical observations
  98. GRB 060502B: AROMA refined photometric calibration
  99. GRB 060502B MDM Follow-up Observation
  100. GRB 060502b: Gemini imaging and spectroscopy

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