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"

37682 results found.

  1. GRB 060210: Refined analysis of the Swift-BAT burst
  2. GRB060210: Swift XRT Refined Analysis
  3. GRB060206, optical observations
  4. GRB 060210 : Xinglong and Lulin optical limit
  5. GRB060210: Gemini absorption spectroscopy
  6. GRB 060210: optical evolution
  7. GRB060210:Faulkes Telescope North Afterglow Confirmation
  8. GRB 060210: candidate afterglow
  9. GRB 060210: Swift detection of a burst
  10. GRB 060206: Swift/UVOT Observations
  11. Swift-BAT trigger 180931 is not a GRB
  12. GRB060209: RTT150 optical observations
  13. GRB 060209 : TAROT optical observation
  14. GRB060209A: MASTER optical observation
  15. GRB 060209(?): Swift-BAT detection of a possible burst
  16. GRB 060206: near-infrared observations (JK' imaging)
  17. GRB 060206: WSRT Radio Observations
  18. GRB 060203: Swift/UVOT upper limits
  19. GRB 060206: TTT Observations
  20. GRB 060206: More PROMPT Detections
  21. GRB 060121 : WIDGET Pre-trigger limit
  22. GRB 060206: Tenagra II Observations
  23. GRB 060206: PROMPT Detections
  24. Retraction of orphan GRB afterglow candidate
  25. GRB060204a: Swift XRT Source is not GRB Afterglow
  26. GRB 060206: optical observations at Asiago
  27. Orphan GRB Afterglow candidate
  28. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  29. GRB 060206: Subaru/FOCAS optical spectroscopy
  30. GRB 060206: IR Detection of the Afterglow
  31. GRB 060206: Lick 3m Spectroscopy
  32. GRB 060204A: ROSAT Pointing
  33. GRB 060206: Super-LOTIS observations
  34. GRB060204A: Swift/UVOT observations
  35. GRB 060206: Swift-BAT refined analysis
  36. GRB 060206 : Lulin optical observations
  37. GRB060206: SDSS Pre-Burst Observations
  38. GRB060206: Swift XRT Refined Analysis
  39. GRB060206: Liverpool Telescope observation
  40. GRB 060206: Spectroscopic Redshift
  41. GRB060206: P60 Optical Observations
  42. GRB 060206: KAIT observations
  43. GRB060206: Swift XRT Position
  44. GRB060206: SARA Detection
  45. GRB 060206: RAPTOR observations of afterglow candidate variability.
  46. GRB 060206: High redshift burst
  47. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  48. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  49. BAT GRB 060204C is probably not a GRB
  50. GRB060204C: optical observation
  51. GRB 060204B: BVRi-band detections of optical afterglow
  52. GRB 060204A: Swift XRT upper limit
  53. GRB 060204A: FRAM optical observations
  54. GRB060204B: Swift/UVOT refined analysis
  55. GRB 060204C: optical observations
  56. Swift XRT Observation of GRB 060204C
  57. GRB 060204B: Swift-BAT refined analysis
  58. GRB 060204B: ART early limit
  59. GRB060204B: Swift XRT Team Refined Analysis
  60. GRB 060204C: OSN limits
  61. GRB 060204b: Keck/LRIS Afterglow Confirmation
  62. GRB 060204C: BOOTES-IR optical limits
  63. GRB 060204C: Liverpool Telescopes optical limit
  64. GRB 060204C: ROTSE-III Optical Limits
  65. GRB 060204C: Swift-BAT detection of a burst
  66. GRB 060124: Radio Observations
  67. GRB060204B: Faulkes OT candidate
  68. GRB 060204B: ART optical limit
  69. GRB 060204A: further INTEGRAL results
  70. GRB060204B - SDSS pre-burst observations
  71. GRB 060203: Swift-BAT refined analysis
  72. GRB 060204B: Swift detection of a burst
  73. GRB 060204: a long GRB detected by INTEGRAL
  74. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  75. GRB 060203: RTT150 optical observations
  76. GRB060203: Swift XRT Team Refined Analysis
  77. Swift-BAT trigger is GRB 060203
  78. GRB 060203: IR Counterpart
  79. GRB060203: Observations with SARA
  80. GRB 060203: P60 Confirmation of Optical Afterglow
  81. Possible GRB 060203: candidate optical counterpart
  82. Possible GRB 060203: optical observations at Asiago
  83. GRB 060202: PROMPT Observations
  84. GRB 060202: GETS observation
  85. GRB 060202: Gemini-N J, H, K_s observations
  86. GRB 060202 : Kiso B and R band limit
  87. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  88. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  89. GRB 060202: Refined analysis of the Swift-BAT burst
  90. GRB 060202: Swift/UVOT upper limits
  91. GRB 060202: Swift XRT Team Refined Analysis
  92. GRB 060202 : Lulin R and I band limit
  93. GRB060202: Faulkes North observation
  94. GRB 060202: Swift detection of a burst
  95. GRB 060121: Gemini Late-time Observations
  96. Erratum: SDSS pre-burst observations of GRB fields
  97. GRB 060130: PROMPT Observations
  98. GRB 060130: Swift/XRT observation
  99. GRB 051211A: MDM Observations
  100. GRB 060123: Gemini spectroscopy of the putative 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