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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"

15556 results found.

  1. GRB 080310: ROTSE-III Observations of Optical Counterpart
  2. GRB080310: Optical observation by MITSuME telescope
  3. GRB080310, optical observations with the LBT
  4. GRB 080307: GAO 150cm telescope Optical Observation
  5. GRB 080229A: GAO 150cm telescope Optical Observation
  6. GRB080210: optical observations
  7. GRB080307: optical upper limit
  8. GRB 080310: Swift/UVOT Refined Analysis
  9. GRB080310 : Lulin optical observation
  10. GRB 080310: RRM optical photometry with the VLT
  11. GRB080310, detection of break in optical
  12. GRB 080310: VLT/UVES spectroscopy
  13. GRB080310, optical observations with LBT
  14. GRB 080310, SMARTS optical/IR afterglow observations
  15. GRB 080310: Magellan redshift
  16. GRB 080310: Swift detection of a burst with optical afterglow
  17. GRB080229, optical upper limit (Correction)
  18. GRB080307, optical upper limit
  19. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  20. GRB080229, optical upper limit
  21. GRB 080307: Early RAPTOR Limits
  22. GRB 080307: TNT optical observation
  23. GRB080307: Optical upper limits
  24. GRB 080307: retraction of UVOT candidate
  25. GRB 080307 : BOAO optical afterglow observation
  26. GRB 080307: Optical observation with DMC/KANATA
  27. Swift UVOT observations of GRB080229B
  28. GRB 080303A: Faulkes Telescope South optical afterglow observations
  29. GRB 080303: Swift detection of a burst with optical afterglow
  30. GRB 080303A: ROTSE-III Optical Limits
  31. GRB 080229: Deep Gemini/GMOS optical observations
  32. GRB080229: Possible optical afterglow
  33. GRB 080229: Faulkes Telescope South optical limit
  34. GRB 080229A: ROTSE-III Optical Limits
  35. Early optical shallow decay in GRB 071112C
  36. GRB080207: optical observations
  37. GRB080205: optical observations
  38. GRB080211: optical observations
  39. GRB 071010B : Early optical brightening detected by TAOS
  40. ESO optical and NIR observations of GRB 080218B
  41. GRB 080212: Mount Abu NIR observations
  42. GRB 080218b, SMARTS optical/IR limits
  43. GRB 080212: VLT optical rapid decay
  44. GRB 080212: REM refined analysis
  45. VLA radio upper limit on GRB 080212
  46. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  47. GRB 080212: Gemini-South optical observations
  48. GRB 080212: optical observations
  49. GRB 080210: Swift/UVOT Refined Analysis
  50. GRB 080207: optical observations.
  51. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  52. GRB 080210: VLT redshift
  53. GRB 080210: GOND detection in all bands and redshift upper limit
  54. GRB 080210: Swift detection of a burst with optical afterglow
  55. GRB 080210: TAROT La Silla observatory optical detection
  56. GRB 080205: GAO 150cm telescope Optical limit
  57. GRB 080207: Optical limits from Gemini-South
  58. GRB 080205: RTT150 optical observations
  59. GRB080207: RTT150 Optical Observations
  60. GRB 080207: REM NIR observations
  61. GRB 080207: TAROT Calern observatory optical observations
  62. GRB 080205 optical upper limit
  63. GRB 080205: MASTER optical observation
  64. GRB 080205: optical observation
  65. GRB 080205: OA evolution from KAIT observations
  66. GRB 080205: Swift/UVOT observations
  67. GRB 080129: Optical observations from OSN
  68. X-ray transient in NGC 2770: RTT150 optical observations
  69. GRB 080129: KAIT optical limits
  70. GRB 080129: optical limit by Pi of the Sky
  71. GRB 080129: TAROT La Silla observatory optical observations
  72. GRB 080129: Gemini-South photometry
  73. GRB 080129: GROND detection in all bands, and fading
  74. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  75. GRB 080129: Gemini-South Imaging Observations
  76. Transient 080109/SN 2008D: Spectroscopic Evolution
  77. SNe 2008D and 2007uy: Chandra Detections
  78. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  79. X-ray transient in NGC 2770: RTT150 optical observations
  80. GRB 080120: GROND confirmation of the optical afterglow
  81. GRB 080120: Swift-XRT refined analysis
  82. GRB 080120: GROND detection
  83. XRF 080109 / SN 2008D: optical observations
  84. NGC 2770B has the same redshift as NGC 2770
  85. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  86. XRF 080109 / SN 2008D: spectroscopic evolution
  87. XRF 080109 / SN 2008D: UKIRT JHK imaging
  88. optical observations, XRT in NGC 2770
  89. XRF 080109/SN 2008D: PROMPT Optical Imaging
  90. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  91. Discovery of Radio Emission from Transient in NGC 2770
  92. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  93. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  94. Transient in NGC 2770: spectroscopic evidence for a SN
  95. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  96. Opticall follow-ups for the X-ray transient in NGC 2770
  97. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  98. Optical Spectroscopy of the Transient in NGC 2770
  99. Swift UVOT Observations of the X-ray transient in NGC 2770
  100. Early OT detection of XRF in NGC 2770 in Asiago frames

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