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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"

12056 results found.

  1. GRB050824: First 2 hours of power low optical decay?
  2. GRB050824: CORRECTION to UVOT observing times
  3. GRB050824: Swift/UVOT detection of fading afterglow
  4. XRF050509c: Radio upper limits from GMRT
  5. GRB050822: Swift/UVOT upper limits
  6. Swift/UVOT UV Photometry of GRB 050820B
  7. GRB 050822: Swift detection of a long burst
  8. Swift/UVOT photometry of GRB050820
  9. GRB050819: Swift-BAT detection of a weak burst
  10. GRB050815: Swift-BAT detection of a burst
  11. GRB050814: SWIFT/UVOT observation
  12. GRB 050814: Swift detection of a burst
  13. GRB050813, SDSS pre-burst observations
  14. GRB050813: SWIFT/UVOT observation
  15. GRB 050813: Possible Short Swift-BAT GRB
  16. GRB050803: Radio Observation
  17. GRB050801: Radio Observation
  18. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  19. GRB050803: Swift-BAT detection of a very long burst
  20. GRB 050730: early TAROT optical observations
  21. Swift/UVOT photometry of GRB050730
  22. GRB 050724: Optical limit
  23. GRB 050724: Swift/UVOT Upper Limit
  24. GRB050714b: Radio Observation
  25. GRB050712: Radio Observations
  26. GRB050713a: Radio Observation
  27. Swift-BAT detection of a possible GRB
  28. Swift/UVOT Observations of GRB 050717
  29. GRB050712: optical limits
  30. Swift detection of GRB 050717
  31. Swift UVOT Observations of GRB 050716
  32. GRB 050716: Optical Observations
  33. GRB050713B :Swift/UVOT observations
  34. GRB 050713A: Swift/UVOT observation
  35. GRB 050713: Swift detection of Bright Burst
  36. GRB 050709: Swift UVOT and XRT observations
  37. GRB 050712: Swift detection of a weak burst
  38. GRB 050626: Swift XRT observations
  39. Swift UVOT observations of GRB 050701
  40. GRB 050607: MDM Observation
  41. GRB 050607: RTT150 optical observations
  42. GRB050607: refined analysis of prompt REM observations
  43. Swift/UVOT observations of GRB050607
  44. Possible GRB050528: no candidate from Liverpool Telescope
  45. GRB050525a: optical upper limits
  46. GRB 050525: MITSuME Optical Observation in VRI
  47. GRB050525: Super-LOTIS observations
  48. XRF050522: Radio Observations
  49. Swift/UVOT observation of XRF 050522
  50. GRB 050509A: Further I-band imaging
  51. GRB050520: Radio Observations
  52. XRF050509C: Chandra Afterglow Detection
  53. XRF 050509c: Swift XRT Upper Limit
  54. XRF050509c: Radio Observations
  55. GRB 050504: Swift XRT afterglow candidate has faded
  56. Refined Chandra analysis of GRB 050509b
  57. GRB 050509b Milagro GeV/TeV Observations
  58. GRB 050505: SARA Observations
  59. GRB 050509B, Optical Observations
  60. GRB 050509b: Optical observations
  61. GRB 050502a: Swift XRT Upper Limit
  62. GRB050416A : 1 GHz limit from GMRT
  63. GRB 050416b:Swift XRT afterglow upper limits
  64. GRB 050416b:Swift XRT afterglow upper limits
  65. Swift UVOT observation of GRB 050504
  66. Swift UVOT refined analysis
  67. GRB 050422: Swift-UVOT observation
  68. GRB 050421: SLOTIS observations
  69. GRB 050421: Swift-UVOT observation
  70. GRB 050412: Chandra observations
  71. GRB050412: Radio Observations
  72. GRB 050416: ART observations
  73. GRB 050412: Optical limit
  74. GRB 050401: Optical limit
  75. GRB 050408: Optical limit
  76. GRB050410: Radio Observations
  77. GRB050408: REM NIR and Optical observation
  78. GRB050401: Radio observation at 610 MHz with GMRT
  79. GRB050319: radio observation
  80. GRB050319: RTT150 Optical Observations
  81. GRB 050319: Swift-UVOT detection of the afterglow
  82. GRB 050306: ROTSE-III early limits
  83. GRB 050315, SMARTS optical/IR afterglow observations
  84. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  85. GRB 050306: Confirmation of X-ray afterglow
  86. GRB 050306: CORRECTION to date of observation
  87. GRB 050306: No Swift UVOT Optical Counterpart Detected
  88. GRB 050306: REM optical-infrared observations
  89. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  90. GRB 050215b: XRT confirmation of IR afterglow candidate
  91. GRB 050215b: Swift XRT Source Variability
  92. GRB 050215B: candidate afterglow
  93. GRB 050128 Optical observation with REM
  94. GRB050126: Burst Parameters Measured by BAT
  95. GRB 050124, SMARTS optical/IR observations
  96. GRB 050124 I-band observation
  97. SGR1806: Detection of a Sudden Ionospheric Disturbance
  98. GRB041223: optical and NIR observations with REM
  99. GRB 041218: optical observations
  100. Deep RAPTOR observations during GRB 041219

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