Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

19089 results found.

  1. PROMPT Rc Observations of GRB 050709
  2. GRB 050525a: PROMPT VRcIc Detections
  3. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  4. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  5. GRB 050408: ARC 3.5-meter NIR Observations
  6. Swift UVOT observations of GRB 050701
  7. GRB 050607, radio observations
  8. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  9. GRB 050626 - a long GRB detected with INTEGRAL
  10. GRB050525a: HST Observations
  11. XRF 050509c: Optical monitoring
  12. XRF050509c: Radio Detection
  13. GRB 050607: MDM Observation
  14. GRB 050607 optical decay
  15. GRB050607: refined analysis of prompt REM observations
  16. GRB 050607 : Lulin R-band observation
  17. GRB 050525a, Mid-Infrared Observations
  18. GRB 050607: Optical decay and spectral slope
  19. GRB050607,optical observation
  20. Optical Afterglow of GRB 050607
  21. GRB050607 optical limit by "Pi of the Sky"
  22. GRB050607: Swift Detection of a long GRB
  23. GRB050607: prompt REM observations
  24. Limits on a SN in the field of GRB 050509b
  25. GRB050603, submillimetre observations
  26. GRB 050603: Swift XRT Position
  27. GRB050603: Radio Detection
  28. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  29. GRB 050603: INTEGRAL shows it is not a short GRB
  30. Swift/BAT Detection of GRB050603
  31. GRB 050525a, infrared observations
  32. GRB050528: updated Liverpool Telescope limits
  33. Swift-BAT GRB 050528: a soft burst
  34. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  35. Possible GRB050528: no candidate from Liverpool Telescope
  36. GRB050525a: Radio Observations
  37. GRB 050509b: refined XRT/Chandra afterglow position analysis
  38. GRB 050525: RTT150, Optical observations
  39. GRB 050525a: SARA Observations
  40. GRB 050525B: Swift-BAT observations
  41. GRB 050525: MITSuME Optical Observation in VRI
  42. GRB050525A,optical observation
  43. GRB050525: Super-LOTIS observations
  44. GRB050306: optical afterglow not confirmed
  45. GRB 050525: BART optical observation
  46. GRB 050525A: BOOTES simultaneous optical observations
  47. GRB050525: Optical observations
  48. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  49. GRB 050525: TAROT observations of the early afterglow
  50. INTEGRAL detection of GRB 050525
  51. GRB 050525, infrared observations
  52. GRB 050525: Optical observation
  53. GRB 050525: observatons of the optical afterglow
  54. GRB050525: ROTSE-III Refined Analysis
  55. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  56. XRF050522: Radio Observations
  57. Swift/UVOT observation of XRF 050522
  58. GRB 050509A: Further I-band imaging
  59. GRB050522,optical observation
  60. GRB050520,optical observation
  61. XRF 050522: Continued NIR P200 Monitoring
  62. RBO Observations of GRB050522
  63. Recent GRB BVRcIc field photometry
  64. GRB050520: Radio Observations
  65. XRF 050522: Swift XRT observation
  66. XRF050522, BVRcIc field photometry
  67. XRF050522: Optical Observations
  68. XRF050522: Near-infrared Observations
  69. GRB 050520: VLT/ULTRACAM observations
  70. Swift UVOT Observations of GRB 050520
  71. XRF050509c: Radio Observations
  72. RBO Observations of GRB050520
  73. GRB 050520: P200 Observations
  74. GRB050520: Liverpool Telescope follow-up
  75. RBO Observations of GRB050520
  76. GRB 050520: TAROT optical limit
  77. GRB 050520: VLT/ULTRACAM observations
  78. GRB050502b: Early Observation
  79. GRB050509b, Bok telescope B-band imaging
  80. GRB050509b, SDSS pre-burst observations
  81. GRB 050509b: Keck/Chandra Cross-Correlation
  82. GRB 050509b: Keck/Chandra Cross-Correlation
  83. Chandra observation of GRB 050509b
  84. GRB 050509b Milagro GeV/TeV Observations
  85. GRB050509B: Optical observations at the Very Large Telescope
  86. GRB 050509b: No Optical Variability in XRT Error Circle
  87. GRB 050509c: ROTSE-III Optical Limits
  88. GRB 050505, early TAROT observation
  89. GRB050509c: REM NIR and Optical observations
  90. GRB 050505: SARA Observations
  91. GRB 050509B: Swift/XRT refined analysis
  92. GRB 050509A: Optical observations
  93. GRB050509b: Radio Observations
  94. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  95. Swift Detection of GRB050509b: A short duration burst
  96. Swift Detection of the Burst GRB050509
  97. GRB 050505, simultaneous optical observation
  98. GRB050505: AAVSO observations
  99. GRB050416A : 1 GHz limit from GMRT
  100. GRB050505: Optical Afterglow Candidate

Advanced

Download all Circulars as a .tar.gz archive:
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