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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"

32568 results found.

  1. VLA radio upper limit on GRB 080120
  2. GRB 080120: Swift-XRT refined analysis
  3. UVOT detection of GRB080120
  4. GRB 080120: GROND detection
  5. GRB080120: Swift XRT position
  6. XRF 080109 / SN 2008D: 1.4 GHz WSRT Radio Observations
  7. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  8. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  9. XRF 080109 / SN 2008D: WSRT Radio Detection
  10. Transient 080109/ SN 2008D, metallicity of the host galaxy
  11. Transient 080109/ SN 2008D, IR Spectrum
  12. XRF 080109 / SN 2008D: optical observations
  13. NGC 2770B has the same redshift as NGC 2770
  14. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  15. XRF 080109 / SN 2008D: spectroscopic evolution
  16. optical observations, XRT in NGC 2770
  17. XRF 080109/SN 2008D: PROMPT Optical Imaging
  18. Gemini-South observations of XRF 080109 / SN 2008D
  19. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  20. Discovery of Radio Emission from Transient in NGC 2770
  21. XRF 080109 in NGC2770: NIR observations at TNG
  22. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  23. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  24. XRF 080109 in NGC2770: Detectable Superluminal Motion
  25. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  26. XRF in NGC 2770: Search for X-ray periodicity
  27. Refined Swift-XRT analysis of the transient in NGC 2770
  28. Transient in NGC 2770: spectroscopic evidence for a SN
  29. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  30. Opticall follow-ups for the X-ray transient in NGC 2770
  31. X-ray transient in NGC 2770: Optical observations with Astrotel-Caucasus
  32. Early OT detection of XRF in NGC 2770 in Asiago frames
  33. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  34. Possible XRF in NGC 2770 - NOT observations of the optical counterpart
  35. Bright X-ray Transient (a XRF? ) in NGC 2770 - A SN optical counterpart?
  36. GRB 071227: Suzaku WAM observation of the prompt emission
  37. GRB 071227: optical afterglow
  38. Further Swift-BAT analysis of GRB 071227
  39. Konus-Wind observation of GRB 071227
  40. GRB 071227: Magellan redshift confirmation
  41. GRB 071227: Swift-XRT refined analysis
  42. GRB 071227: VLT probable redshift of the candidate host galaxy
  43. GRB 071227: Magellan observations
  44. GRB071227: Swift/UVOT refined analysis
  45. GRB 071227: REM NIR and Optical observations
  46. Swift-BAT refined analysis of short GRB 071227
  47. GRB071020: optical observations
  48. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  49. Swift-BAT trigger 298308 is not a GRB
  50. GRB 071125: Suzaku WAM observation of the prompt emission
  51. GRB 070429B: Probable host galaxy and redshift
  52. GRB 071129, Swift-BAT refined analysis
  53. Konus-Wind and Konus-A observations of GRB 071125
  54. GRB 071112C: Optical/NIR observations
  55. Disregard the "GRB 071126" position
  56. VLA radio detection of GRB 071122
  57. GRB071122: Swift/UVOT Observations
  58. GRB071104: NIR Afterglow Candidate at TNG
  59. GRB 071122: MASTER optical observation
  60. GRB 071122, Swift-BAT refined analysis
  61. GRB 071122 Swift XRT position update sent in error.
  62. GRB 071122 Swift-XRT refined analysis
  63. GRB 071122: Corrected P60 Coordinates
  64. GRB071122: Gemini Absorption redshift
  65. GRB 071122: P60 Optical Afterglow Candidate
  66. GRB 071122: ROTSE-III Optical Limits
  67. GRB 071118: P60 Observations
  68. GRB071118 MITSuME OAO optical observation
  69. GRB 071118: Observations from OSN
  70. GRB 071117: VLT observations and probable redshift
  71. Swift/UVOT observations of GRB071118
  72. GRB 071117: Swift-XRT revised position
  73. Konus-Wind and Konus-A observations of GRB 071117
  74. Swift XRT follow-up observations of GRB071008
  75. Swift/UVOT upper limits for GRB 071117
  76. GRB071118: Swift XRT refined analysis
  77. GRB 071117: Gemini Optical Afterglow Discovery
  78. GRB 071118, Swift-BAT refined analysis
  79. GRB 071112B: Gemini Image Differencing
  80. GRB 071117: Gemini Observations
  81. GRB 071117: Swift-XRT refined analysis
  82. GRB 071117, Swift-BAT refined analysis
  83. VLT FORS2 observations of short hard GRB071112B
  84. GRB 071117: Swift/XRT position
  85. VLA radio upper limit on GRB 071112C
  86. ATCA radio observations of short hard burst GRB 071112B
  87. GRB 071112C: Optical and NIR data observed with KANATA
  88. Correction to the Swift-BAT Transient Identification (trigger=296683)
  89. GRB 071112C: WSRT Radio Observations
  90. GRB071112C: Errata of MITSuME Ic band photometry
  91. GRB 071112C: optical observation
  92. GRB 071112C: optical observation
  93. GRB 071112C: emission lines and refined VLT redshift
  94. GRB 071112C MITSuME Akeno early optical observation
  95. GRB 071112C: Gemini Absorption Redshift
  96. GRB 071112B: 2nd epoch of Magellan i-band imaging
  97. GRB 071112C: SARA upper limit
  98. GRB 071112C : Second Epoch Lulin R-band observations
  99. GRB071112C MITSuME Okayama Optical Observation
  100. GRB 071112C: Swift-BAT refined analysis

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