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"

20408 results found.

  1. GRB070729: Swift/UVOT upper limits
  2. GRB 070729: Swift-XRT refined analysis
  3. GRB 070724B: P60 Observations
  4. GRB 070724B: Swift/UVOT Upper limits
  5. GRB 070721A: optical observations
  6. GRB 070724A: further VLT observations
  7. Four radio sources in Swift-XRT error box of GRB 070724
  8. GRB 070724: P60 and Gemini Observations
  9. GRB 060814 - Keck host detection and redshift
  10. Swift/UVOT refined analysis of GRB070724
  11. GRB 070724: Swift-XRT Team refined analysis
  12. GRB 070721B: further observations and analysis
  13. GRB 070724: Swift detection of a burst
  14. GRB 070714B: Keck observations
  15. Swift/UVOT Observations of GRB070721A
  16. GRB 070721B : Faulkes Telescope South observations
  17. GRB 070721A : Faulkes Telescope South optical limit
  18. GRB 070721A: Swift/XRT refined analysis
  19. GRB 070721A, Swift-BAT refined analysis
  20. GRB070721B: A bright UVOT candidate
  21. GRB070714B: TNG NIR observations
  22. GRB 070714A: Swift/UVOT Upper limits
  23. GRB 070714B: Swift/UVOT Upper Limits
  24. GRB 070714B: Swift-BAT spectral lag for the SHB
  25. GRB 070714B: confirmation of optical afterglow
  26. GRB 070616: No Evidence for I Band Afterglow
  27. GRB 070714A: Swift XRT refined analysis
  28. GRB070714B: Swift-XRT refined analysis
  29. GRB 070714 : Liverpool Telescope optical counterpart ?
  30. GRB 070714: Swift detection of a bright burst, possibly short
  31. GRB 070704: RTT150 optical observations
  32. GRB 070707: optical afterglow
  33. Swift/UVOT Observations of GRB070707
  34. Swift XRT observation of GRB 070707
  35. GRB 070707: VLT observations
  36. GRB 070707: A long GRB detected by INTEGRAL
  37. GRB 070707: A long GRB detected by INTEGRAL
  38. GRB 070429B: NIR Observations
  39. GRB070704: FAVOR optical observations
  40. GRB 070704 : Liverpool Telescope Observations
  41. GRB 070611: VLT observations
  42. VLA detection of GRB 070612A in C Band
  43. Konus-Wind observation of GRB 070626
  44. GRB 070704: Swift-XRT refined analysis
  45. Swift/UVOT Observations of GRB070704
  46. GRB 070704: Correction to GCN Circ 6594
  47. GRB 070704: Swift detection of a burst
  48. GRB 070626: Suzaku/WAM observation of the prompt emission
  49. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  50. GRB 070628 Swift-UVOT Refined Analysis
  51. GRB 070628: NIR detection of afterglow
  52. GRB 070628: TAROT La Silla observatory optical observations
  53. INTEGRAL burst GRB070615: X-ray continued observations
  54. GRB 070616 : WIDGET simultaneous optical observations
  55. GRB070621: RTT150 optical observations
  56. GRB 070621: VLT optical observations
  57. GRB 070621: Swift/UVOT Upper Limits
  58. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  59. WHT observations of GRB070621
  60. GRB 070621: Gemini South optical imaging
  61. GRB 070621: UVOT-enhanced XRT position
  62. Observations of GRB070612A at Calar Alto
  63. GRB 070621: NOT observations
  64. GRB070621: OPTIMA-Burst optical upper limit
  65. GRB 070621: TAROT Calern observatory optical observations
  66. GRB 070621: Watcher Observations
  67. GRB 070621: Swift detection of a burst
  68. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  69. Swift/UVOT detection of GRB070616 optical afterglow.
  70. GRB070616: Optical Observation by MITSuME Okayama
  71. GRB 070616: TLS observation
  72. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  73. GRB 070616: Swift detection of a burst
  74. GRB 070612B: optical observations
  75. UVOT Observations of INTEGRAL burst GRB070615
  76. VLA upper limit on GRB 070610
  77. GRB 070615
  78. SWIFT J195509.6+261406 (GRB 070610): further observations
  79. GRB 070612A: Super-LOTIS observations
  80. GRB 070612A: Rapid Decay
  81. GRB 070612A: Suzaku/WAM observation of the prompt emission
  82. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  83. GRB070612A: MITSuME Okayama Observation
  84. GRB 070612A: continued SARA observations
  85. GRB 070611: Watcher Observations
  86. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  87. GRB 070612B: SARA upper limit
  88. GRB 070612B: Swift-XRT refined analysis
  89. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  90. GRB 070612B: Swift/UVOT upper limits
  91. GRB 070612B: FRAM limit
  92. GRB070612B: P60 Observations
  93. GRB 070612A: SARA detection of possible OT
  94. GRB 070610: TAROT Calern observatory optical observations
  95. GRB 070610: MITSuME OAO optical upper limit
  96. GRB070612 - SDSS Pre-Burst Observations
  97. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  98. GRB 070610: SARA upper limit
  99. GRB 070610: Swift-XRT refined analysis
  100. GRB 070611: Swift/UVOT Observations

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