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"

45590 results found.

  1. GRB 060729: Swift/UVOT Detections
  2. GRB 060729: Refined analysis of the Swift-BAT burst
  3. GRB 060729: Swift-XRT refined analysis
  4. GRB 060729 : Planned XMM-Newton observation
  5. GRB 060729: Swift/UVOT Observations
  6. GRB 060729: ROTSE-III Detection of Optical Counterpart
  7. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  8. GRB 060728: Swift/UVOT Upper Limits
  9. GRB 060728: Refined analysis of the Swift-BAT burst
  10. GRB 060728, SMARTS optical/IR observations
  11. Swift/XRT preliminary analysis
  12. GRB 060728: Swift detection of a burst
  13. GRB060614 ATCA Radio Limits
  14. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  15. GRB 060714: Swift/UVOT Observations
  16. GRB060719: prompt NIR observations with REM
  17. GRB 060714: NOT observations
  18. GRB 060719: near-infrared afterglow
  19. GRB 060719: correction to the coordinates reported in GCN 5347
  20. GRB 060522: VLA observation
  21. GRB 060719: Swift/UVOT Upper Limits
  22. GRB 060719: VLT/ISAAC observations
  23. GRB 060719: Refined analysis of the Swift-BAT burst
  24. GRB 060719: XRT refined analysis
  25. GRB 060719: further analysis of VLT observations
  26. GRB 060719: optical limit by Pi-of-the-Sky
  27. GRB060719: FRAM early follow-up limit
  28. GRB 060719: prompt PROMPT observations
  29. GRB060719: REM NIR Observations
  30. GRB 060719: VLT observations
  31. GRB 060719: LCO optical observations
  32. GRB 060719: Swift detection of a burst
  33. GRB 060717: Swift XRT refined analysis
  34. GRB 060714: OA fading and a possible host detection
  35. GRB060714: optical observations
  36. GRB 060717: NOT observations
  37. GRB 060714: Refined analysis of the Swift-BAT burst
  38. GRB 060717 optical upper limit
  39. GRB060717: Swift/UVOT upper limits
  40. GRB 060717: Swift XRT refined position
  41. GRB 060717: Swift-BAT refined analysis
  42. GRB060717 - SDSS Pre-burst Observations
  43. GRB 060714: REM infrared observations
  44. GRB 060717, optical observation
  45. GRB 060717: Swift detection of a burst
  46. GRB060714: correction to GCN 5324
  47. GRB060714: optical observations
  48. GRB 060714, SMARTS optical/IR afterglow observation
  49. GRB 060714 : Liverpool Telescope Observations
  50. GRB 060714: Swift XRT refined analysis
  51. GRB 060714: OA redshift
  52. GRB 060708: VLT spectroscopy
  53. GRB060708: MARGE low resolution spectrum observations
  54. GRB060714: optical observations
  55. Swift-BAT trigger 219136 is not a GRB
  56. Correction to Circular 5314: Circular refers to GRB 060714
  57. GRB060707 possible optical confirmation
  58. Swift trigger 219136 is probably not a GRB
  59. GRB 060714, optical observation
  60. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  61. GRB 060605: SkyNet Optical Limits
  62. GRB060712: P60 Observations
  63. GRB 060712: XRT refined analysis
  64. GRB 060712: Swift/UVOT Upper Limits
  65. GRB060526: optical observations
  66. GRB 060712: XRT refined position
  67. GRB 060712: Refined analysis of the Swift-BAT burst
  68. GRB 060712: Swift detection of a burst
  69. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  70. GRB 060708: PROMPT Optical Limits
  71. GRB 060707: OA fading and redshift
  72. GRB 060708: Swift-XRT refined analysis
  73. GCN 060708: Swift-UVOT Observations
  74. GRB 060708: Refined analysis of the Swift-BAT burst
  75. GCN 060707: Swift-UVOT observations
  76. GRB 060707: Swift-XRT refined analysis
  77. GRB 060708: Swift detection of a burst with an UVOT countpart
  78. GRB060707 possible optical confirmation
  79. GRB 060707: BOOTES-IR optical afterglow candidate
  80. GRB 060707: Refined analysis of the Swift-BAT burst
  81. GRB 060707: BOOTES-IR optical observation
  82. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  83. GRB 060707: Swift detection of a burst
  84. GRB 060515: Upper Limit on Host Galaxy
  85. GRB 050223: Magellan redshift
  86. GRB 060614: SMARTS host galaxy observations
  87. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  88. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  89. GRB 060109: Upper Limit on Host Galaxy
  90. GRB 060105: Upper limit on Host Galaxy
  91. GRB060614: Detection of the host galaxy but no supernova emission
  92. GRB 060614: redshift confirmation
  93. GRB 060614: Redshift
  94. Swift-BAT trigger 215279 is not a GRB
  95. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  96. GRB060614: Optical observations
  97. GRB 060614: spectroscopy
  98. GRB050326: Host Galaxy Candidates
  99. GRB050124: Possible Host Galaxy
  100. GRB050223: Host Galaxy

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