Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

32541 results found.

  1. GRB 090807: Liverpool Telescope observations
  2. GRB 090807: MITSuME optical upper limit
  3. GRB 090807: Swift/UVOT Upper Limits
  4. GRB 090807: Swift-XRT refined analysis
  5. GRB 090807, Swift-BAT refined analysis
  6. GRB 090807, RIMOTS optical upper limits
  7. GRB 090726: optical observation
  8. Swift-BAT trigger 358760 is most likely not a GRB
  9. GRB 090717A: Suzaku WAM observation of the prompt emission
  10. GRB 090709A : Quick look analysis of the Suzaku observation
  11. GRB 090728: Swift-BAT refined analysis
  12. GRB 090727: GRT Optical Observation
  13. GRB 090728: Swift XRT refined analysis
  14. GRB 090727: optical observations
  15. GRB 090726: GRT Optical Observation
  16. GRB 090727: Swift/UVOT Upper Limits
  17. GRB 090728: Swift/UVOT Upper Limits
  18. GRB 090727: I-band observations from 1.23m CAHA
  19. GRB 090728, RIMOTS optical upper limits
  20. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate
  21. GRB 090727: Swift-BAT refined analysis
  22. GRB 090727: Swift-XRT refined analysis
  23. GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
  24. GRB 090715B: Late-time Lick 3m observations
  25. GRB 090727: Liverpool Telescope possible OT candidate
  26. GRB090726: Swift/UVOT observations
  27. GRB 090726, Swift-BAT refined analysis
  28. GRB 090726: Afterglow candidate photometryfrom Crni Vrh
  29. GRB 090726: D50 optical observations
  30. GRB090726: 6-meter telescope redshift
  31. GRB 090726: Swift-XRT Team refined analysis
  32. GRB 090726: optical transient candidate
  33. GRB 090726: Swift/UVOT Finding Chart Observation
  34. Konus-Wind and Konus-RF observations of GRB 090719
  35. Konus-RF and Konus-Wind observations of GRB 090718B
  36. Konus-Wind observations of bright hard GRB 090720B
  37. IPN Triangulation of bright GRB 090720B
  38. GRB 090720: Gemini-North Imaging and Optical Afterglow
  39. Swift XRT and UVOT refned analysis of GRB 090720
  40. GRB 090709A: Swift XRT Timing Analysis
  41. GRB 090715B: VLA radio detection
  42. GRB 090720 Source found in ground processing of Swift-BAT data
  43. GRB 090715B: further NOT optical observations
  44. GRB 090715A: Suzaku WAM observation of the prompt emission
  45. GRB 090709A - CARMA mm Observations
  46. GRB 090715B: Lick observations
  47. Konus-Wind observations of short/hard GRB 090715A
  48. GRB 090715B: MASTER optical limit
  49. GRB 090715A: Swift-BAT refined analysis
  50. Konus-Wind and Konus-RF observations of GRB 090715B
  51. GRB 090715B: Swift/UVOT followup observations
  52. GRB 090715B: break in the optical afterglow decay
  53. GRB 090715B: Observation of the optical afterglow
  54. GRB 090715B: Swift XRT Refined Analysis
  55. GRB090715B: WHT redshift
  56. GRB 090715B: Swift-BAT refined analysis
  57. GRB 090715B: NOT optical observations
  58. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  59. GRB 090715A: ROTSE-III Optical Limits
  60. GRB 090715: Swift detection of a short hard burst
  61. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  62. Swift satellite anomaly
  63. GRB 090712: Fermi GBM observation
  64. GRB 090712: Swift-BAT refined analysis
  65. GRB 090709A: Xinglong TNT optical upper limit
  66. VLA radio observations of GRB 090709A
  67. GRB 090621B: MTM-500 optical observations
  68. GRB 090709A: deep optical observation with the 10.4m GTC
  69. GRB090709A : WSRT Radio observation
  70. GRB 090709A: Suzaku WAM observation of the prompt emission
  71. GRB 090709A: Swift UVOT upper limits
  72. GRB 090709A: WHT LIRIS observations
  73. GRB 090709B: Fermi GBM detection
  74. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  75. GRB 090709A: evidence for a very red afterglow at low z
  76. Konus-Wind and Konus-RF observations of GRB 090709A
  77. GRB 090709A: P60 Observations
  78. GRB 090709A: Quasiperiodic variations in the BAT light curve
  79. GRB 090709A: NOT optical observations
  80. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  81. GRB 090709A: Swift XRT Refined Analysis
  82. GRB 090709B, Swift-BAT refined analysis
  83. GRB 090709A: Swift-BAT refined analysis
  84. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  85. GRB 090709A, RIMOTS optical upper limits
  86. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  87. GRB 090709A: Subaru NIR observation
  88. GRB 090709 : planned Suzaku-ToO observation
  89. GRB 090708 : Fermi GBM detection
  90. GRB 090709: Faulkes Telescope North Upper Limits
  91. GRB 090626: Suzaku WAM observation of the prompt emission
  92. GRB 090709: PAIRITEL NIR Upper Limits
  93. GRB 090704: Fermi GBM observation
  94. GRB 090709: ROTSE-III Optical Limits
  95. GRB 090708: Early RAPTOR Optical Limits
  96. GRB 090708, Swift-BAT refined analysis
  97. GRB 090708: ROTSE-III Optical Limits
  98. Possible GRB090705: Swift-XRT observations
  99. GRB 090705: PAIRITEL NIR Observations
  100. XRF 090702 : RTT150 optical 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