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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"

3138 results found.

  1. GRB 080721, Swift-BAT refined analysis
  2. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  3. Trigger 317393: Swift detection of a possible GRB
  4. GRB 080714: Swift detection of a burst
  5. GRB 080702B: Swift XRT and UVOT observations
  6. GRB 080701A: Early Super-LOTIS Observations
  7. Konus-Wind observation of GRB 080605
  8. GRB 080603B : Xinglong EST observations
  9. Konus-Wind observation of GRB 080603B
  10. GRB 080603B, Swift-BAT refined analysis
  11. GRB080604: confirmation of optical afterglow
  12. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  13. Swift analysis of BAT Slew Survey event (Trigger=009)
  14. GRB 080514B: UVOT Observations
  15. GRB 080514B: Swift-XRT analysis
  16. GRB 080514B: Afterglow candidate
  17. Konus-Wind observation of GRB 080507
  18. GRB 080430
  19. GRB 080420?: Swift detection of a possible short burst
  20. GRB 080413B: Rapid PROMPT Observations
  21. GRB 080413A: MOA-II optical afterglow observations
  22. GRB 080411: Swift-XRT Refined Analysis
  23. GRB080330: MAGIC telescope GeV observation
  24. GRB 080411: Swift detection of a bright burst
  25. GRB 080330: REM optical observations
  26. GRB 080330 Swift-UVOT refined analysis
  27. GRB 080330: Swift detection of a burst with an optical counterpart
  28. GRB 080325: NIR afterglow candidate
  29. GRB 080320: Early Super-LOTIS Observations
  30. GRB 080319B: Gemini-South photometry
  31. GRB 080319b light curve by Pi-of-the-Sky
  32. GRB 080319A: Swift detection of a burst
  33. Swift trigger 306323: Swift-BAT/XRT refined analysis
  34. GRB 080310: GAO 150cm telescope Optical Observation
  35. GRB 080310: RRM optical photometry with the VLT
  36. GRB080310: Super-LOTIS suggestion of brightening
  37. VLA possible radio detection of GRB 080229
  38. GRB 080229: Enhanced Swift-XRT position
  39. UVOT analysis for GRB080229
  40. GRB 080229: Swift detection of a bright burst
  41. GRB 080218: Swift detection of a burst
  42. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  43. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  44. GRB 080205: GAO 150cm telescope Optical limit
  45. GRB 080129: TAROT La Silla observatory optical observations
  46. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  47. GRB 071125: Suzaku WAM observation of the prompt emission
  48. IPN triangulation of very bright GRB 071125
  49. GRB071104: NIR Afterglow Candidate at TNG
  50. GRB 071122: MASTER optical observation
  51. Correction to the Swift-BAT Transient Identification (trigger=296683)
  52. GRB071112C: Errata of MITSuME Ic band photometry
  53. GRB071112C MITSuME Okayama Optical Observation
  54. GRB 071112C: Palomar Pre-Imaging
  55. VLA prompt radio detection of the INTEGRAL burst 071109
  56. GRB 071104: Swift-XRT position
  57. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  58. GRB 071031: Swift detection of a burst with an optical counterpart
  59. GRB 071028: Swift detection of a burst
  60. GRB 071025: Kuiper Telescope Optical Observations
  61. GRB 071025: R/I-band update
  62. GRB071021 : CFHT Ks-band observation
  63. Possible radio detection of GRB 071021 with the VLA
  64. GRB 071021: correction to GCNC 6968
  65. GRB 071021: optical and NIR observations
  66. GRB 071021: Swift-XRT Team refined analysis
  67. GRB 071021: Faulkes Telescope South optical candidate
  68. GRB 071021: Swift detection of a burst
  69. GRB071010b: optical observations
  70. GRB 071010A: Continued Keck Imaging
  71. GRB 071010B: Bright OT confirmed with TLS
  72. GRB 071010, Swift-BAT refined analysis
  73. Konus-Wind observation of GRB 071006
  74. GRB 071010 REM NIR observations
  75. GRB 071010: Swift detection of a burst
  76. GRB 070810B: further XRT analysis
  77. GRB 071003: OA power-law decay indices from KAIT
  78. GRB 071003: KAIT optical afterglow observations
  79. GRB 070911, SMARTS optical/IR afterglow observations
  80. INTEGRAL ToO observations of SGR1806-20
  81. GRB 070913: Swift-BAT refined analysis
  82. GRB 070731, Swift-BAT refined analysis
  83. VLA upper limit on short hard burst GRB 070714B
  84. Konus-Wind observation of GRB 070724B
  85. GRB 070704, Swift-BAT refined analysis
  86. GRB 070628: Swift detection of a possible burst
  87. GRB 070612A: Allen Telescope Array Observations
  88. GRB 070612A: Super-LOTIS observations
  89. GRB 070611: Watcher Observations
  90. GRB 070612B: KAIT limits
  91. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  92. GRB 070521: optical limit by Pi of the Sky
  93. GRB 070506, Swift-BAT Refined Analysis
  94. GRB 070506: Swift detection of a burst with optical afterglow
  95. GRB 070429: Swift detection of a burst
  96. GRB 070427: Swift detection of a burst
  97. GRB 070420 Swift-BAT Refined Analysis
  98. GRB070419A, optical observation
  99. GRB 070412: Optical observations at Crni Vrh
  100. GRB 070411: Tautenburg RRM Afterglow Confirmation

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