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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').

774 results found.

  1. GRB 120510A: Swift XRT and UVOT observations
  2. GRB 120510A: MASTER follow up observations
  3. GRB 120510A: MAXI/GSC detection of a burst
  4. GRB 120424A: MAXI/GSC detection of a burst
  5. GRB 120127A / P48 Imaging
  6. GRB 120127A: MASTER optical observations
  7. GRB 120127A: MAXI/GSC detection of a probable GRB
  8. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  9. XRF 111111A/MAXI J0158-744: MAXI GSC refined analysis
  10. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  11. GRB 111024A: MAXI/GSC detection of a burst
  12. GRB 110905A / MAXI J1836-194: optical monitoring
  13. Trigger 504307: Swift detection of MAXI J1836-194
  14. MAXI/GSC detection of a short soft X-ray transient
  15. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
  16. GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
  17. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  18. GRB 110426A: Fermi GBM detection
  19. GRB 110426A: Swift/XRT non-detection
  20. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  21. GRB 110426A: MAXI/GSC detection of a GRB
  22. GRB 110213B: Swift/UVOT observations
  23. GRB110213B: X-ray afterglow confirmation
  24. GRB 110213B: P60 Optical Afterglow Candidate
  25. GRB 110213B: Swift XRT observation
  26. Konus-Wind observation of GRB 110213B
  27. GRB 110213B: MAXI/GSC refined analysis
  28. GRB 110213B: MAXI/GSC detection of a probable GRB
  29. New feature in Fermi GBM GRB Ground Position Notices
  30. GRB 101225A: MAXI/GSC observations
  31. XRF 101117A, RIMOTS optical upper limits
  32. Swift detection of MAXIJ1409-619
  33. XRF 101117A: Palomar Transient Factory Observations
  34. GRB 101117B: Swift-BAT refined analysis
  35. XRF101117A: MAXI/GSC detection of a short X-ray transient
  36. GRB 100925A / MAXI J1659-152: MASTER optical observations
  37. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  38. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  39. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  40. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  41. GRB 100925A / MAXI J1659-152: SARA-S Observations
  42. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  43. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  44. GRB 100925A/MAXI J1659-152 - NOT optical observations
  45. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  46. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  47. GRB 100823A: MAXI/GSC detection
  48. GRB 100704: Swift/UVOT Upper Limits
  49. XRF 100701A : MAXI/GSC detection of a probable XRF
  50. XRF 100616a : MAXI/GSC detection of a probable XRF
  51. GRB 100615A: Swift/UVOT Upper Limits
  52. GRB 100510A: Fermi GBM detection/observation
  53. GRB 100510A: MAXI/GSC detection
  54. GRB 100415A: MAXI/GSC detection of a probable GRB
  55. Short X-ray Transient detected by MAXI/GSC
  56. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  57. Short X-ray Transient detected by MAXI/GSC
  58. Short X-ray Transient, RIMOTS optical upper limits
  59. Short X-ray Transient Detection by MAXI/GSC
  60. IPN Triangulation of GRB091120
  61. Konus-Wind observation of GRB 091120
  62. GRB 091120: MAXI GSC detection
  63. GRB 090926B: MAXI GSC detection
  64. GRB 090831A: Suzaku WAM observation of the prompt emission
  65. GRB 090831A: IPN Triangulation
  66. GRB 090831: MAXI GSC detection
  67. GRB 090621: Swift/UVOT Upper Limits
  68. GRB080916A: Refined Swift/UVOT Observations
  69. GRB 080703: UVOT Follow-Up Observation
  70. GRB 080310: Swift/UVOT Refined Analysis
  71. Transient 080109/ SN 2008D, metallicity of the host galaxy
  72. Swift/UVOT observations of GRB070721B optical afterglow.
  73. Swift/UVOT refined analysis of GRB070529
  74. GRB 060109: Swift/UVOT upper limits

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