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"

28227 results found.

  1. Erratum : Suzaku WAM observation of GRB 070704
  2. GRB 070714A: Swift/UVOT Upper limits
  3. GRB 070714B: Swift/UVOT Upper Limits
  4. GRB 070714B: confirmation of optical afterglow
  5. GRB 070616: No Evidence for I Band Afterglow
  6. GRB 070714A: Swift XRT refined analysis
  7. GRB070714B: Swift-XRT refined analysis
  8. GRB 070707: Swift-XRT follow-up observations
  9. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  10. GRB 070714A, Swift-BAT refined analysis
  11. GRB 070714 : Liverpool Telescope optical counterpart ?
  12. GRB 070714: Swift detection of a bright burst, possibly short
  13. SN 2007bg - off-axis GRB?
  14. GRB 070704: RTT150 optical observations
  15. GRB 070704: Suzaku/WAM observation of the prompt emission
  16. Konus-Wind observation of GRB 070707
  17. GRB 070707: optical afterglow
  18. Swift/UVOT Observations of GRB070707
  19. Swift XRT observation of GRB 070707
  20. GRB 070707: VLT observations
  21. GRB070704: FAVOR optical observations
  22. GRB 070704 : Liverpool Telescope Observations
  23. GRB 070611: VLT observations
  24. VLA detection of GRB 070612A in C Band
  25. GRB 070704: Swift-XRT refined analysis
  26. Swift/UVOT Observations of GRB070704
  27. GRB 070704, Swift-BAT refined analysis
  28. GRB 070704: Correction to GCN Circ 6594
  29. GRB 070704: Swift detection of a burst
  30. GRB 070626: Suzaku/WAM observation of the prompt emission
  31. GRB 070628 Swift-UVOT Refined Analysis
  32. GRB 070628: NIR detection of afterglow
  33. GRB 070628, Swift-BAT refined analysis
  34. GRB 070628: TAROT La Silla observatory optical observations
  35. Swift UVOT Observations of GRB 070628
  36. OT20050728 was not an optical GRB afterglow
  37. GRB 070616 : WIDGET simultaneous optical observations
  38. GRB 070616: Suzaku/WAM observation of the prompt emission
  39. GRB070621: RTT150 optical observations
  40. GRB 070621: VLT optical observations
  41. GRB 070621: Swift/UVOT Upper Limits
  42. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  43. GRB 070621: Swift-BAT refined analysis
  44. GRB070621: Swift XRT refined analysis
  45. GRB 070621: Gemini South optical imaging
  46. GRB 070621: UVOT-enhanced XRT position
  47. Observations of GRB070612A at Calar Alto
  48. GRB 070621: NOT observations
  49. GRB070621: OPTIMA-Burst optical upper limit
  50. GRB 070621: TAROT Calern observatory optical observations
  51. GRB 070621: Watcher Observations
  52. GRB 070621: Swift detection of a burst
  53. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  54. Swift/UVOT detection of GRB070616 optical afterglow.
  55. GRB 070612A: NOT observations
  56. GRB070616: Optical Observation by MITSuME Okayama
  57. GRB 070616, Swift-BAT further refined analysis
  58. GRB 070616: BTA optical observations
  59. GRB 070616: TLS observation
  60. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  61. GRB 070616: Swift detection of a burst
  62. GRB 070612B: optical observations
  63. UVOT Observations of INTEGRAL burst GRB070615
  64. VLA upper limit on GRB 070610
  65. GRB 070615
  66. SWIFT J195509.6+261406 (GRB 070610): further observations
  67. GRB 070612A: Super-LOTIS observations
  68. GRB 070612A: Rapid Decay
  69. GRB 070612A: Suzaku/WAM observation of the prompt emission
  70. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  71. GRB070612A: MITSuME Okayama Observation
  72. GRB 070612A: continued SARA observations
  73. GRB 070611: Watcher Observations
  74. Swift Trigger 282176 is Cygnus X-1
  75. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  76. GRB 070612B: SARA upper limit
  77. GRB 070612B, Swift-BAT refined analysis
  78. GRB 070612A, Swift-BAT refined analysis
  79. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  80. GRB 070612B: Swift/UVOT upper limits
  81. GRB 070612B: FRAM limit
  82. GRB070612B: P60 Observations
  83. GRB 070612A: SARA detection of possible OT
  84. GRB 070610: TAROT Calern observatory optical observations
  85. GRB 070610: MITSuME OAO optical upper limit
  86. GRB070612 - SDSS Pre-Burst Observations
  87. GRB 070612: Swift detection of a burst
  88. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  89. GRB 070610: SARA upper limit
  90. GRB 070610: Swift-XRT refined analysis
  91. GRB 070611: Swift/UVOT Observations
  92. GRB 070611: Swift-XRT refined analysis
  93. GRB 070611, Swift-BAT refined analysis
  94. GRB 070610: Optical observations from OSN
  95. GRB 070610: Watcher Observations
  96. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  97. GRB 070611: ROTSE-III Optical Limits
  98. GRB 070610: Swift-UVOT Upper Limits
  99. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  100. GRB 070610, 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