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"

20519 results found.

  1. GRB060806 is similar to previous activity of SGR1806-20
  2. GRB 060807: XRT Team refined analysis
  3. GRB 060807: Refined analysis of the Swift-BAT burst
  4. GRB060807: optical afterglow candidate
  5. GRB 060805B: RHESSI Spectral Fit
  6. IPN triangulation of GRB060806 (long, exceptionally bright)
  7. GRB060807 - SDSS Pre-burst Observations
  8. GRB 060805B: Swift/UVOT Upper Limits
  9. GRB 060807, optical observation
  10. GRB 060807: Kanazawa R-band observation
  11. GRB060805 Liverpool Telescope observations
  12. GRB 060805: XRT Team Refined Analysis
  13. GRB 060805: Swift/UVOT Upper Limits
  14. GRB 060805: P60 Observations
  15. GRB 060805 - SDSS Pre-Burst Observations
  16. GRB 060804: Swift UVOT observations
  17. GRB 060804: Refined analysis of the Swift-BAT burst
  18. GRB 060728: Upper limits of the X-ray emission
  19. GRB 060801: no variability of optical sources
  20. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  21. GRB060801: Radio Observations
  22. GRB 051109B: Bright spiral host galaxy at low redshift
  23. GRB060801: Swift/UVOT Upper Limits
  24. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  25. GRB 060801, optical observation
  26. GRB 060801: Kanazawa Optical Observation
  27. GRB 060719: TORTOREM optical upper limits
  28. GRB 060729: Refined analysis of the Swift-BAT burst
  29. GRB 060729: Swift/UVOT Observations
  30. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  31. GRB 060728: Swift/UVOT Upper Limits
  32. GRB 060728, SMARTS optical/IR observations
  33. Swift/XRT preliminary analysis
  34. GRB 060728: Swift detection of a burst
  35. GRB 060714: Swift/UVOT Observations
  36. GRB060719: prompt NIR observations with REM
  37. GRB 060714: NOT observations
  38. GRB 060719: near-infrared afterglow
  39. GRB 060522: VLA observation
  40. GRB 060719: Swift/UVOT Upper Limits
  41. GRB 060719: VLT/ISAAC observations
  42. GRB060719: REM NIR Observations
  43. GRB 060719: VLT observations
  44. GRB 060719: LCO optical observations
  45. GRB 060719: Swift detection of a burst
  46. GRB060717: Swift/UVOT upper limits
  47. GRB060717 - SDSS Pre-burst Observations
  48. GRB 060714: REM infrared observations
  49. GRB 060717, optical observation
  50. GRB 060714 : Liverpool Telescope Observations
  51. GRB 060708: VLT spectroscopy
  52. GRB060707 possible optical confirmation
  53. Swift trigger 219136 is probably not a GRB
  54. GRB 060714, optical observation
  55. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  56. GRB060712: P60 Observations
  57. GRB 060712: Swift/UVOT Upper Limits
  58. GRB 060712: XRT refined position
  59. GRB 060707: OA fading and redshift
  60. GRB 060708: Swift-XRT refined analysis
  61. GCN 060708: Swift-UVOT Observations
  62. GCN 060707: Swift-UVOT observations
  63. GRB 060708: Swift detection of a burst with an UVOT countpart
  64. GRB 060515: Upper Limit on Host Galaxy
  65. GRB 060109: Upper Limit on Host Galaxy
  66. GRB 060105: Upper limit on Host Galaxy
  67. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  68. GRB050326: Host Galaxy Candidates
  69. GRB050124: Possible Host Galaxy
  70. GRB050223: Host Galaxy
  71. GRB060605: optical observation
  72. GRB 060605, optical observations
  73. GRB 060614: Swift/UVOT Observations
  74. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  75. GRB 060602A: Swift/XRT analysis
  76. GRB 060610: KAIT observations
  77. GRB 060607: RTT150 optical observations
  78. GRB060602A: Swift/UVOT upper limits
  79. GRB 060607B: Swift detection of a burst
  80. GCN 060607: Swift-UVOT obswervations.
  81. GRB 060607: IR observations
  82. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  83. GRB 060605: RTT150 optical observations
  84. GRB 060607: REM NIR afterglow
  85. GRB 060607: Swift detection of a burst with bright optical counterpart
  86. GRB 060522: PROMPT Optical Limits
  87. GRB 060605: Xinglong TNT optical observations
  88. GRB060602B : REM infrared observations
  89. GRB060605: Swift/UVOT detections
  90. GRB 060605: RTT150 optical observations
  91. GRB 060605: Swift detection of a burst with optical counterpart
  92. GRB060604: Swift/UVOT detections
  93. GRB 060604: redshift
  94. GRB 060604A: ROTSE-III Optical Limits
  95. GRB 060604: Swift detection of a burst with possible optical counterpart
  96. GRB 060602B: XMM-Newton Survey Source
  97. GRB 060602B: Swift/UVOT observations
  98. GRB060602A: optical observations(/transient?)
  99. GRB 060602B: Swift detection of a burst
  100. GRB060602B: Watcher observations - no OT candidate

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