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"

32692 results found.

  1. GRB060717 - SDSS Pre-burst Observations
  2. GRB 060714: REM infrared observations
  3. GRB 060717, optical observation
  4. GRB060714: correction to GCN 5324
  5. GRB 060714, SMARTS optical/IR afterglow observation
  6. GRB 060714 : Liverpool Telescope Observations
  7. GRB 060714: Swift XRT refined analysis
  8. GRB 060714: OA redshift
  9. GRB 060708: VLT spectroscopy
  10. GRB060708: MARGE low resolution spectrum observations
  11. Swift-BAT trigger 219136 is not a GRB
  12. Correction to Circular 5314: Circular refers to GRB 060714
  13. GRB060707 possible optical confirmation
  14. GRB 060714, optical observation
  15. GRB 060605: SkyNet Optical Limits
  16. GRB060712: P60 Observations
  17. GRB 060712: Swift/UVOT Upper Limits
  18. GRB 060712: Refined analysis of the Swift-BAT burst
  19. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  20. GRB 060708: PROMPT Optical Limits
  21. GRB 060707: OA fading and redshift
  22. GRB 060708: Swift-XRT refined analysis
  23. GCN 060708: Swift-UVOT Observations
  24. GRB 060708: Refined analysis of the Swift-BAT burst
  25. GCN 060707: Swift-UVOT observations
  26. GRB 060707: Swift-XRT refined analysis
  27. GRB060707 possible optical confirmation
  28. GRB 060707: Refined analysis of the Swift-BAT burst
  29. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  30. GRB 060515: Upper Limit on Host Galaxy
  31. GRB 050223: Magellan redshift
  32. GRB 060614: SMARTS host galaxy observations
  33. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  34. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  35. GRB 060109: Upper Limit on Host Galaxy
  36. GRB 060105: Upper limit on Host Galaxy
  37. GRB060614: Detection of the host galaxy but no supernova emission
  38. GRB 060614: redshift confirmation
  39. GRB 060614: Redshift
  40. Swift-BAT trigger 215279 is not a GRB
  41. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  42. GRB060614: Optical observations
  43. GRB 060614: spectroscopy
  44. GRB050326: Host Galaxy Candidates
  45. GRB050124: Possible Host Galaxy
  46. GRB050223: Host Galaxy
  47. GRB060512: near IR observations
  48. Konus-Wind observation of GRB 060614
  49. GRB060605: optical observation
  50. The Unusually Long-Lived Afterglow of GRB 060614
  51. GRB 060614: optical observations
  52. GRB 060605, optical observations
  53. GRB 060614, SMARTS optical/IR afterglow observation
  54. GRB060614: SSO 1m observations
  55. GRB060614: Watcher observation
  56. GRB 060614: Swift-BAT refined analysis
  57. GRB 060614: Swift/UVOT Observations
  58. GRB060614: Swift-XRT refined analysis
  59. GRB 060604, optical observations
  60. GRB 060602A: Swift/XRT analysis
  61. BAT Trigger #214277 is SGR 1900+14
  62. GRB 070706B: Watcher upper limit
  63. GRB 060607B: Swift-BAT Refined Analysis
  64. GRB060602A: Swift/UVOT upper limits
  65. GCN 060607: Swift-UVOT obswervations.
  66. GRB 060607: Swift-BAT Refined Analysis
  67. GRB 060607: Swift-XRT Team refined analysis
  68. GRB 060607: IR observations
  69. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  70. VLT/UVES observations of GRB 060607
  71. GRB 060607: PROMPT Observations
  72. GRB 060607: REM NIR afterglow
  73. GRB 060522: PROMPT Optical Limits
  74. GRB 060605 BAT refined analysis
  75. GRB 060605: Xinglong TNT optical observations
  76. GRB060602B : REM infrared observations
  77. GRB060605: Swift/UVOT detections
  78. GRB 060605: Swift-XRT Team refined analysis
  79. SALT spectroscopy of GRB 060605
  80. GRB 060605: TNG optical observations
  81. GRB 060605: RTT150 optical observations
  82. GRB060605: Spectral Observations and Redshift
  83. GRB 060605: ROTSE-III Optical Counterpart
  84. GRB 060605: ROTSE-III Detection of Optical Counterpart
  85. GRB060604: Swift/UVOT detections
  86. GRB 060604: redshift
  87. GRB 060512: Keck Redshift
  88. GRB 060604 optical photometry
  89. GRB 060604: Swift-XRT Team refined analysis
  90. GRB 060604: BAT refined analysis
  91. GRB 060604A: ROTSE-III Optical Limits
  92. GRB 060602A: Swift-BAT Refined Analysis: Correction
  93. GRB 060602B: XMM-Newton Survey Source
  94. GRB 060602B: Swift-XRT Refined Analysis
  95. GRB 060602B: Swift-BAT Refined Analysis
  96. GRB 060602B: Swift/UVOT observations
  97. GRB 060602A: Swift-BAT Refined Analysis
  98. GRB 060211A : WIDGET simultaneous optical observations
  99. GRB060602A: optical observations(/transient?)
  100. GRB 060526: Tautenburg Second Epoch Observations

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