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"

36784 results found.

  1. GRB 070704: Swift-XRT refined analysis
  2. Swift/UVOT Observations of GRB070704
  3. GRB 070704, Swift-BAT refined analysis
  4. GRB 070704: Correction to GCN Circ 6594
  5. GRB 070704: Swift detection of a burst
  6. GRB 070626: Suzaku/WAM observation of the prompt emission
  7. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  8. GRB 070628 Swift-UVOT Refined Analysis
  9. GRB 070628: NIR detection of afterglow
  10. GRB 070628, Swift-BAT refined analysis
  11. GRB 070628: TAROT La Silla observatory optical observations
  12. GRB 070628: Swift XRT refined analysis
  13. GRB 070628: Watcher Observations
  14. Swift UVOT Observations of GRB 070628
  15. GRB 070628: Swift detection of a possible burst
  16. GRB 070612A: Allen Telescope Array Observations
  17. IBAS Alert n. 4638: Not a GRB
  18. OT20050728 was not an optical GRB afterglow
  19. GRB 070616 : WIDGET simultaneous optical observations
  20. GRB 070616: Suzaku/WAM observation of the prompt emission
  21. IBAS Alert n.4637: not a GRB
  22. GRB 070612A: Second Epoch WSRT Radio Observations
  23. GRB070621: RTT150 optical observations
  24. GRB 070621: VLT optical observations
  25. GRB 070621: Swift/UVOT Upper Limits
  26. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  27. GRB 070621: Swift-BAT refined analysis
  28. GRB 070621: Gemini South optical imaging
  29. GRB 070621: UVOT-enhanced XRT position
  30. Observations of GRB070612A at Calar Alto
  31. GRB 070621: NOT observations
  32. GRB070621: OPTIMA-Burst optical upper limit
  33. GRB 070621: TAROT Calern observatory optical observations
  34. GRB 070621: Watcher Observations
  35. GRB 070621: ROTSE-III Prompt Optical Limits
  36. GRB 070621: Swift detection of a burst
  37. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  38. GRB 070612A: TNG optical observations
  39. Swift/UVOT detection of GRB070616 optical afterglow.
  40. GRB070612A: Gemini Spectroscopic Redshift
  41. GRB 070612A: NOT observations
  42. GRB 070612B: Optical Observation by MITSuME Akeno
  43. GRB070616: Optical Observation by MITSuME Okayama
  44. GRB 070616, Swift-BAT further refined analysis
  45. GRB 070616: Swift XRT refined circular
  46. GRB 070612A: Possible WSRT Radio Detection
  47. GRB 070616: BTA astrometry and finding chart
  48. GRB 070616: BTA optical observations
  49. GRB 070616: TLS observation
  50. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  51. GRB 070616, Swift-BAT partial refined analysis
  52. GRB 070616: Swift detection of a burst
  53. GRB 070612B: optical observations
  54. VLA upper limit on GRB 070610
  55. GRB 070615
  56. GRB 070615: A long GRB detected by INTEGRAL
  57. SWIFT J195509.6+261406 (GRB 070610): further observations
  58. GRB 070612A: Super-LOTIS observations
  59. GRB 070612A: Rapid Decay
  60. GRB 070612A: Suzaku/WAM observation of the prompt emission
  61. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  62. GRB070612A: MITSuME Okayama Observation
  63. GRB 070612A: continued SARA observations
  64. GRB 070612A: spectral lag
  65. GRB 070611: Watcher Observations
  66. Swift Trigger 282176 is Cygnus X-1
  67. GRB 070612A: MDM Observations
  68. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  69. GRB 070612B: SARA upper limit
  70. GRB 070612B, Swift-BAT refined analysis
  71. GRB 070612A, Swift-BAT refined analysis
  72. GRB 070612B: Swift-XRT refined analysis
  73. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  74. GRB 070612B: Swift/UVOT upper limits
  75. GRB 070612B: FRAM limit
  76. GRB 070612B: KAIT limits
  77. GRB 070612A: SARA detection of possible OT
  78. GRB 070612B: Swift XRT position from downlink data
  79. GRB 070610: TAROT Calern observatory optical observations
  80. GRB 070610: MITSuME OAO optical upper limit
  81. GRB 070612B: Swift detection of a burst
  82. GRB070612 - SDSS Pre-Burst Observations
  83. GRB 070612: Swift detection of a burst
  84. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  85. GRB 070610: SARA upper limit
  86. GRB 070610: Swift-XRT refined analysis
  87. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  88. GRB 070611: Swift/UVOT Observations
  89. GRB 070611: Swift-XRT refined analysis
  90. GRB 070611, Swift-BAT refined analysis
  91. GRB 070610: Optical observations from OSN
  92. GRB 070610: Watcher Observations
  93. GRB 070611: VLT redshift
  94. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  95. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  96. GRB 070611; Swift-XRT position
  97. GRB 070611: ROTSE-III Optical Limits
  98. GRB 070611: Swift detection of a burst
  99. GRB 070610: Swift-UVOT Upper Limits
  100. GRB 070610: OPTIMA-Burst high-time-resolution optical observations

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