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"

32552 results found.

  1. GRB 070621: Watcher Observations
  2. GRB 070621: ROTSE-III Prompt Optical Limits
  3. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  4. GRB 070612A: TNG optical observations
  5. Swift/UVOT detection of GRB070616 optical afterglow.
  6. GRB070612A: Gemini Spectroscopic Redshift
  7. GRB 070612A: NOT observations
  8. GRB070616: Optical Observation by MITSuME Akeno
  9. GRB 070612B: Optical Observation by MITSuME Akeno
  10. GRB070616: Optical Observation by MITSuME Okayama
  11. GRB 070616, Swift-BAT further refined analysis
  12. GRB 070616: Swift XRT refined circular
  13. GRB 070612A: Possible WSRT Radio Detection
  14. Swift/UVOT observations of GRB070616
  15. GRB 070616: TLS observation
  16. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  17. GRB 070616, Swift-BAT partial refined analysis
  18. GRB 070612B: optical observations
  19. VLA upper limit on GRB 070610
  20. GRB 070615
  21. GRB 070612A: Super-LOTIS observations
  22. GRB 070612A: Rapid Decay
  23. GRB 070612A: Suzaku/WAM observation of the prompt emission
  24. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  25. GRB070612A: MITSuME Okayama Observation
  26. GRB 070612A: continued SARA observations
  27. GRB 070612A: spectral lag
  28. GRB 070611: Watcher Observations
  29. GRB 070612A: MDM Observations
  30. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  31. GRB 070612B: SARA upper limit
  32. GRB 070612B, Swift-BAT refined analysis
  33. GRB 070612A, Swift-BAT refined analysis
  34. GRB 070612B: Swift-XRT refined analysis
  35. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  36. GRB 070612B: Swift/UVOT upper limits
  37. GRB070612B: P60 Observations
  38. GRB 070612B: KAIT limits
  39. GRB 070612A: SARA detection of possible OT
  40. GRB 070612B: Swift XRT position from downlink data
  41. GRB 070610: MITSuME OAO optical upper limit
  42. GRB070612 - SDSS Pre-Burst Observations
  43. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  44. GRB 070610: SARA upper limit
  45. GRB 070610: Swift-XRT refined analysis
  46. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  47. GRB 070611: Swift/UVOT Observations
  48. GRB 070611: Swift-XRT refined analysis
  49. GRB 070611, Swift-BAT refined analysis
  50. GRB 070610: Watcher Observations
  51. GRB 070611: VLT redshift
  52. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  53. GRB 070611; Swift-XRT position
  54. GRB 070611: ROTSE-III Optical Limits
  55. GRB 070610: Swift-UVOT Upper Limits
  56. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  57. GRB 070610, Swift-BAT refined analysis
  58. GRB 070610; Swift-XRT position
  59. GRB 070411: TAROT Calern observatory optical observations
  60. GRB 070419A, deep LBT photometry and possible supernova detection
  61. GRB070520B: optical observations
  62. GRB070520: optical observation
  63. GRB070518: optical observation
  64. GRB070521: optical observation
  65. Swift/UVOT refined analysis of GRB070531
  66. GRB 070531: Swift-BAT refined analysis
  67. GRB 070531: Swift-XRT position
  68. GRB 070531: Liverpool Telescope Optical Observations
  69. GRB 070529: SARA upper limit
  70. Swift/UVOT refined analysis of GRB070529
  71. GRB 070529: MARGE Observations
  72. GRB 070529: Optical aterglow from MIRO
  73. GRB 070529: Gemini Redshift
  74. GRB 070529: Swift-XRT refined analysis
  75. GRB 070529, Swift-BAT refined analysis
  76. GRB 070529: Xinglong TNT Optical Upper Limit
  77. GRB 070412: Deep Keck imaging
  78. Swift Triggers 280447, 280450 and 280451 are invalid
  79. GRB 070518, deep LBT photometry
  80. GRB 070518: MARGE Observations
  81. Konus-Wind observation of GRB 070521
  82. GRB 070518: optical observation
  83. GRB070521: Second Epoch Gemini Imaging
  84. GRB070521: NIR observations
  85. GRB070520B: NIR observations
  86. GRB 070521: Swift/UVOT Upper Limits
  87. GRB 070521, optical observation
  88. GRB 070521: Swift-XRT refined analysis
  89. GRB 070521: Keck imaging
  90. GRB070521: Gemini Observations
  91. GROND upper limits of GRB 070521
  92. GRB 070521 Milagro GeV/TeV Observations
  93. GRB 070520B: SARA upper limit
  94. GRB 070520A: SARA upper limit
  95. GRB 070521: SARA upper limit
  96. GRB 070521: Subaru observations and possible host detection
  97. GRB070518: Optical/NIR observation
  98. GRB 070520B: Swift/UVOT Upper Limits
  99. GRB 070520A: Subaru Observations
  100. GRB 070521, Swift-BAT refined analysis

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