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"

36334 results found.

  1. SWIFT J195509.6+261406 (GRB 070610): further observations
  2. GRB 070612A: Super-LOTIS observations
  3. GRB 070612A: Rapid Decay
  4. GRB 070612A: Suzaku/WAM observation of the prompt emission
  5. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  6. GRB070612A: MITSuME Okayama Observation
  7. GRB 070612A: continued SARA observations
  8. GRB 070612A: spectral lag
  9. GRB 070611: Watcher Observations
  10. Swift Trigger 282176 is Cygnus X-1
  11. GRB 070612A: MDM Observations
  12. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  13. GRB 070612B: SARA upper limit
  14. GRB 070612B, Swift-BAT refined analysis
  15. GRB 070612A, Swift-BAT refined analysis
  16. GRB 070612B: Swift-XRT refined analysis
  17. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  18. GRB 070612B: Swift/UVOT upper limits
  19. GRB 070612B: FRAM limit
  20. GRB 070612B: KAIT limits
  21. GRB 070612A: SARA detection of possible OT
  22. GRB 070612B: Swift XRT position from downlink data
  23. GRB 070610: TAROT Calern observatory optical observations
  24. GRB 070610: MITSuME OAO optical upper limit
  25. GRB 070612B: Swift detection of a burst
  26. GRB070612 - SDSS Pre-Burst Observations
  27. GRB 070612: Swift detection of a burst
  28. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  29. GRB 070610: SARA upper limit
  30. GRB 070610: Swift-XRT refined analysis
  31. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  32. GRB 070611: Swift/UVOT Observations
  33. GRB 070611: Swift-XRT refined analysis
  34. GRB 070611, Swift-BAT refined analysis
  35. GRB 070610: Optical observations from OSN
  36. GRB 070610: Watcher Observations
  37. GRB 070611: VLT redshift
  38. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  39. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  40. GRB 070611; Swift-XRT position
  41. GRB 070611: ROTSE-III Optical Limits
  42. GRB 070611: Swift detection of a burst
  43. GRB 070610: Swift-UVOT Upper Limits
  44. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  45. GRB 070610, Swift-BAT refined analysis
  46. GRB 070610; Swift-XRT position
  47. GRB 070610: Swift detection of a burst
  48. GRB 070412: TAROT Calern observatory optical observations
  49. GRB 070411: TAROT Calern observatory optical observations
  50. GRB 070419A, deep LBT photometry and possible supernova detection
  51. GRB070520B: optical observations
  52. GRB070520: optical observation
  53. GRB070518: optical observation
  54. GRB070521: optical observation
  55. GRB 070531: NOT nIR observations
  56. GRB 070531: Swift-BAT refined analysis
  57. GRB 070531: I-band observations from IAC80
  58. GRB 070531: Swift-XRT position
  59. GRB 070531: Liverpool Telescope Optical Observations
  60. GRB 070531: Swift detection of a burst
  61. GRB 070529: SARA upper limit
  62. GRB 070529: MARGE Observations
  63. GRB 070529: Optical aterglow from MIRO
  64. GRB 070529: Gemini Redshift
  65. GRB 070529: Swift-XRT refined analysis
  66. GRB 070529, Swift-BAT refined analysis
  67. GRB 070529: Xinglong TNT Optical Upper Limit
  68. GRB 070529: Swift detection of a burst with an optical aterglow
  69. GRB 070412: Deep Keck imaging
  70. Swift trigger 280447 is probably a Galactic transient
  71. GRB 070518, deep LBT photometry
  72. GRB 070518: MARGE Observations
  73. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  74. Konus-Wind observation of GRB 070521
  75. GRB 070518: optical observation
  76. GRB070520B: NIR observations
  77. GRB 070521: Swift/UVOT Upper Limits
  78. GRB 070521, optical observation
  79. GRB 070521: Swift-XRT refined analysis
  80. GRB 070521: Keck imaging
  81. GROND upper limits of GRB 070521
  82. GRB 070521 Milagro GeV/TeV Observations
  83. GRB 070520B: SARA upper limit
  84. GRB 070520A: SARA upper limit
  85. GRB 070521: SARA upper limit
  86. GRB 070521: Subaru observations and possible host detection
  87. GRB 070520B: Swift/UVOT Upper Limits
  88. GRB 070520A: Subaru Observations
  89. GRB 070521, Swift-BAT refined analysis
  90. GRB 070520A: Swift UVOT Upper Limits
  91. GRB 070520B: Swift-XRT refined analysis
  92. GRB 070521: optical limit by Pi of the Sky
  93. GRB070521 : Faulkes Telescope North Observations
  94. GRB 070521: TAROT La Silla observatory optical observations
  95. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  96. GRB070521 - SDSS Pre-Burst Observations
  97. GRB 070521: Swift detection of a burst
  98. GRB 070520A: MITSuME Akeno optical upper limits
  99. GRB 070520B, Swift-BAT refined analysis
  100. GRB 070520A, 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